stationary blade, blade set, and method of making a metal-plastic composite stationary blade

专利摘要:
STATIONARY BLADE, BLADE SET, AND METHOD OF MANUFACTURING A METAL-PLASTIC COMPOSITE BLADE The present disclosure refers to a hair cutting device (10), a set of blades (20) for a hair cutting device (10) and a stationary blade (22) for said blade set (20). Said stationary blade (22) may comprise a first wall portion (100) arranged to serve as a wall facing the skin when in operation, a second wall portion (102) displaced at least partially in relation to the first wall portion (100), so that the first wall portion (100) and the second wall portion (102) define between them a guide slot (96) arranged to receive a movable cutting blade (24), at least one front edge toothed (30) comprising a plurality of teeth (36) formed together by the first wall portion (100) and the second wall portion (102), the stationary blade (22) being a stationary metal-plastic compound blade integrally (22), the first wall portion (100) being made at least partially of a metallic material, the second wall portion (102) being made at least partially of a plastic material, and the first wall portion (100) and the (...)
公开号:BR112016023796B1
申请号:R112016023796-0
申请日:2015-04-20
公开日:2021-02-09
发明作者:Fransiscus Hermannus Feijen；Siegfried Sablatschan；Geert Veenstra；Wouter Van Kempen；Jacob Willem Kroon；Albert Jan Aitink
申请人:Koninklijke Philips N.V；
IPC主号:

专利说明:

Field of invention
[001] The present disclosure relates to a hair cutting device, particularly to a hair cutting device powered by electricity and, more specifically, to a stationary blade of a set of blades for such a device. The set of blades can be arranged to be moved through the hairs in a direction of movement to cut hairs. The stationary blade can be composed of a first wall portion and a second wall portion that define a guide slot between themselves, where a movable cutting blade can be at least partially understood and guided. The present disclosure further relates to a method of making a stationary blade and a set of blades for a hair cutter. Background of the invention
[002] WO 2013/150412 A1 discloses a hair cutting device and a corresponding set of blades for a hair cutting device. The blade set comprises a stationary blade and a movable blade, the movable blade being reciprocating in relation to the stationary blade for cutting hair. The blade set is particularly suitable to allow trimming and shaving or epilation operations.
[003] For the purposes of cutting body hair, there are basically two distinct types of electrical appliances: razors or shavers and hair trimmers or clippers. In general, the razor or epilator is used for shaving or epilation, that is, cutting body hair at the level of the skin in order to obtain smooth skin without short, spiky hair. The hair trimmer is normally used to cut the hair at a chosen distance from the skin, that is, to cut the hair to a desired length. The difference in application is reflected in the different structure and architecture of the cutting blade layout implemented in any appliance.
[004] An electric razor or shaver typically includes a metal foil, that is, an ultra-thin perforated fabric, and a cutting blade that is movable along the inside of the metal foil and in relation to it. During use, the outer part of the foil is placed on and forced against the skin, so that any hair that penetrates the foil is cut by the cutting blade that moves in relation to the inner part of the foil, and falls into the hollow portions collection of hair inside the shaver or shave.
[005] An electric hair trimmer, on the other hand, usually includes, in general, two cutting blades having a serrated edge, one placed on top of the other so that the respective serrated edges overlap. In operation, the cutting blades reciprocate in relation to each other, cutting any hair that is caught between your teeth in a scissor action. The exact level above the skin at which the hair is cut is usually determined by means of an additional fixable part, called a shield (spacer) or comb.
[006] Additionally, combined devices are known which are basically adapted for both shaving or hair removal and trimming purposes. However, such devices include only two separate and distinct cutting sections, namely: a shaving or shaving section comprising a configuration compatible with the concept of electric shavers or shavers, as described above, and a trimming section comprising a configuration compatible with the concept of hair trimmers.
[007] Common electric shaving or shaving devices are not particularly suitable for cutting hair to a desired variable length above the skin, that is, for precise trimming operations. This can be explained, at least in part, by the fact that they do not include mechanisms for spacing the metal sheet and, consequently, the cutter blade, from the skin. However, even if they included, for example, by adding spacer fixing parts, such as spacing combs, the configuration of the metal sheet, which typically involves a large number of small perforations, would decrease the efficient capture of almost all hairs. shorter and harder.
[008] Similarly, common hair trimmers are not particularly suitable for shaving or waxing, mainly because the separate cutting blades require a certain stiffness and, therefore, thickness, to perform the action of scissors without deformation. It is the minimum required thickness of a blade facing the skin that prevents hair from being cut close to the skin. Consequently, for a user who wants to shave / shave or trim their body hair, it may be necessary to purchase and use two separate appliances.
[009] In addition, combined shaving or waxing and trimming devices have several disadvantages because they basically require two sets of cutting blades and the respective drive mechanisms. As a result, these devices are heavier and more susceptible to wear than standard, single-function hair clippers, and also require expensive assembly and manufacturing processes. Similarly, the operation of these combined devices is often considered to be quite uncomfortable and complex. Even if a conventional shaving or shaving and shaving device is used, which comprises two separate cutting sections, handling the device and switching between different operating modes can be considered time-consuming and not very favorable to the user. Since the cutting sections are usually provided at different locations on the device, the precision in orientation (and therefore also precision in cutting) can be reduced, as the user needs to get used to two different, dominant holding positions, during operation.
[010] WO 2013/150412 A1 mentioned above addresses some of these problems by providing a blade set comprising a stationary blade that houses a movable blade so that a first portion of the stationary blade is arranged on the side of the movable blade facing for the skin, when used for shaving or waxing, and so that a second portion of the stationary blade is arranged on the side of the movable blade facing the opposite side of the skin when in use. In addition, on a serrated cutting edge, the first and second portions of the stationary blade are connected, thus forming a plurality of stationary teeth covering respective teeth of the movable blade. Consequently, the movable blade is protected by the stationary blade.
[011] This arrangement is advantageous in that the stationary blade can give the blade set greater resistance and rigidity, since the stationary blade is also present on the side of the mobile blade facing the opposite side of the skin. In general, this can allow the thickness of the first portion of the stationary blade to be reduced on the side of the movable blade facing the user's skin. Therefore, as the mobile blade can get closer to the skin during operation, the blade set mentioned above is well suited for shaving or hair removal operations. Additionally, the set of blades is particularly suitable also for hair trimming operations, since the configuration of the cutting edge, including respective teeth that alternate with the slits, also allows the longer hairs to enter the slits and, with that, are cut by the relative cutting movement between the movable blade and the stationary blade.
[012] However, there is still a need for improvement in hair cutting devices and respective sets of blades. This may specifically involve aspects related to user comfort, performance and manufacturing. Aspects related to manufacturing may involve suitability for series production or mass production. Summary of the invention
[013] It is an objective of the present disclosure to provide an alternative stationary blade, and a corresponding set of blades that allows for both shaving or waxing and trimming operations. In particular, a stationary blade and a set of blades can be provided that can contribute to a pleasant user experience in both shaving or waxing and trimming operations. More preferably, the present disclosure can address at least some of the disadvantages inherent in known hair cutting blades of the prior art, as discussed above, for example. It would be additionally advantageous to provide a set of blades that could exhibit improved operational performance, while preferably reducing the time required for cutting operations. It is also preferable to provide an associated method of making such a stationary blade. It is particularly desirable to present a manufacturing method that makes it possible to produce sets of blades, specifically stationary blades, with a good cost / benefit ratio and an adequate process capacity.
[014] In a first aspect of the present invention, a stationary blade is presented for a set of blades of a hair cutting device, said set of blades being arranged to be moved through the hairs in a direction of movement for cut hairs, and the stationary blade comprises: - a first portion of the wall arranged to serve as a wall facing the skin when in operation, - a second portion of the wall displaced at least partially in relation to the first portion of the wall, so that the first wall portion and the second wall portion define between them a guide slot arranged to receive a movable cutting blade, - at least one toothed front edge comprising a plurality of teeth formed together by the first wall portion and the second portion of wall, the stationary blade being a metal-plastic composite stationary blade formed integrally, the first portion of the wall being fabri each at least partially of a metallic material, the second portion of the wall being made, at least partially, of a plastic material, and the first portion of the wall and the second portion of the wall being arranged to receive the movable cutting blade in the guide slot in a defined coupling.
[015] This aspect is based on the perception that the stationary blade can be configured to accommodate the mobile cutting blade in a predefined way. In particular, the movable cutting blade can be received directly on the stationary blade, that is, without the need to mount additional bending or spring elements in the guide slot. More particularly, the movable cutting blade can be received in the guide slot in a sliding manner. In contrast, conventional blade set arrangements typically include additional bending elements, such as spring elements, that force the movable blade into close contact with the stationary blade.
[016] The defined coupling of the movable blade in the guide slot may comprise a defined clearance slot, transition slot and pressure slot. The defined coupling can be obtained through the defined clearance and considerably narrow tolerances in the guide slot.
[017] The first portion of the wall that can come into close contact with the skin, and which is basically configured to act in conjunction with a mobile cutting blade to cut hair, preferably comprises considerable properties of rigidity and robustness. The first wall portion can be made, at least partially, of a metallic material, particularly of a type of steel, for example, stainless steel. Consequently, although the first wall portion may preferably be of a small thickness to allow hair to be cut close to the skin, it can provide adequate strength. In addition, the second wall portion can be added on the side typically facing the opposite side of the skin to further reinforce the stationary blade. The first wall portion and the second wall portion can act together to form the guide slot.
[018] Preferably, the stationary blade can be obtained from a combined manufacturing process that involves the formation of the plastic material and the bonding of the plastic material to the metallic material, basically at the same time. It is particularly preferred that the stationary blade consists of the first wall portion and the second wall portion, that is, it is not necessary to assemble essential components to them to obtain the stationary blade. In general, the stationary blade can be considered as a two-component part in which the two components are integrally and fixedly interconnected.
[019] In one embodiment, the first wall portion and the second wall portion are configured to receive the movable cutting blade directly between them, particularly without an additional bending element. Consequently, manufacturing costs and assembly costs can be reduced.
[020] In one embodiment, the stationary blade further comprises a metal component, particularly a laminar metal insert, and a plastic component attached to the metal component, with at least a central portion of the first wall portion being formed by the component of metal. This can have the advantage that the metal component can have particularly thin walls, which can allow hair to be cut very close to a user's skin. Consequently, shaving or waxing performance can be improved.
[021] In one embodiment, the first wall portion and the second wall portion allow for a plug-in coupling with a defined clearance of the mobile cutting blade in the guide slot of the stationary blade, and a height dimension with vertical clearance lcl of the The guide slot is preferably larger than an expected vertical thickness dimension of a movable cutting blade to be assembled. Therefore, a set with a defined clearance for the movable cutter blade can be provided.
[022] In one embodiment, the first wall portion and the second wall portion allow a defined coupling with pre-tensioned adjustment of the mobile cutting blade in the guide slot of the stationary blade, and the height dimension with vertical clearance lcl of the guide slot is preferably less than an expected vertical thickness dimension lt of a movable cutting blade to be assembled. Therefore, a defined pressure fitting or, at least, a defined transition fitting can be provided for the movable cutting blade.
[023] In one embodiment, the second wall portion comprises at least one protruding contact portion facing the first wall portion, particularly at least one contact ridge extending laterally, the at least one protruding contact portion it is configured to contact the bottom surface of the movable cutter blade. The bottom surface can also be considered a rear surface. The at least one protruding contact portion may project inwardly from the second wall portion towards the first wall portion. A resulting gap between the at least one protruding contact portion and the first wall portion, particularly a surface thereof facing the opposite side of the skin, can define the height dimension with vertical clearance lcl. The expression “extending laterally” will not be interpreted in a limiting sense as requiring a portion of protruding contact that extends laterally in a continuous manner.
[024] In one embodiment, at least one protruding contact portion is configured to force the movable cutting blade against the first wall portion in an assembled state. Consequently, the stationary blade, as such, can act as a bending element that ensures the coupling condition of the movable cutting blade.
[025] In one embodiment, the teeth of at least one notched anterior edge comprise, when viewed in a plane in cross section perpendicular to a lateral Y direction, a substantially U-shaped shape comprising a first leg in the first wall portion and a second leg on the second portion of the wall, the first leg and the second leg meshing at the ends of the teeth, and the second portion of the wall comprising an inclined portion adjacent to the second leg, the at least one element of protruding contact is preferably arranged in a transition between the second leg and the inclined portion. Between the first leg and the second leg, a defined mounting gap or slot can be provided for the movable cutting blade, particularly for the teeth of the same. This setting can further improve cutting performance.
[026] In one embodiment, the first wall portion is a basically rigid wall portion, the second wall portion is a basically flexible wall portion, at least a central portion of the first wall portion is produced from a material with a modulus of elasticity that is greater than the modulus of elasticity of a material from which at least a central portion of the second wall portion is produced. Basically, the second wall portion can be significantly thicker than the first wall portion, which can also give the second wall portion considerable strength properties. Consequently, the blade set as such can be stiffened.
[027] In one embodiment, the stationary blade, particularly its plastic component, exhibits residual stress, specifically residual flexural stresses that are attributable to the distortion related to injection molding, and as a result of the distortion, at least an anterior edge is flexed in relation to a central portion. In particular, the at least one front edge can be flexed backwards when viewed in a plane in cross section perpendicular to the lateral direction Y, so that the resulting height dimension with vertical clearance 1cl is reduced. In general, as a result of the distortion of the plastic component, the stationary blade can be flexed, particularly curved in a convex manner when viewed in the plane in cross section perpendicular to the lateral Y direction. This may involve a situation in which the stationary blade acts, while less partially, such as a flat spring element or laminated spring element that can apply bending forces to the movable blade.
[028] In one embodiment, the stationary blade additionally comprises a portion of the gap formed next to the guide slot in the vicinity of at least one toothed anterior edge, the portion of the gap comprising at least one of a lower gap in the second portion of wall and a frontal gap in the transition between the first wall portion and the second wall portion, the gap portion being an internal indentation at least partially concave in shape, the gap portion being arranged to provide a remaining gap lvg, lfg between the guide slot and an anterior toothed edge of a movable cutting blade received in this gap. Preferably, the span portion is adapted to accommodate hair, particularly sections of short hair. In other words, the span portion can be adapted to an expected dimension, for example, an expected diameter, of cut hair. The span portion may be formed in the guide slot adjacent to the projecting contact portion. The stationary blade may comprise a first span portion and a second span portion associated with respective cutting anterior edges.
[029] This configuration can have the advantage that the hairs, particularly the cut hairs, can enter the span between the second wall portion and the movable cutting blade. As further described here, there is a possibility that cut hairs may enter and block a gap between the movable cutting blade and the second wall portion, if the gap is too small to accommodate hair without generating considerable (frictional) forces between the guide slot and movable cutting blade. Although, in general, most of the cut hairs can be ejected from the guide slot without entering the gap, there is a possibility that some hairs can be pulled in and, consequently, become trapped in the gap, which can impair performance cutting. This can increase energy consumption and frictional heat generation from the blade set. In general, the reduction in the cutting speed (for example, reduced engine rotation speed) can be perceived by the user as a loss of power and can therefore be interpreted as a degradation of quality.
[030] This problem can be circumvented, on the other hand, by minimizing the gap between the mobile cutting blade and the guide slot of the stationary blade. However, this approach may require manufacturing the blade assembly components with a high degree of accuracy, which can further increase manufacturing costs. On the other hand, this problem can be addressed with reference to the above modality by means of a defined increase in the span, providing sufficient clearance to accommodate hair without generating significant frictional forces when the mobile cutting blade is actuated in relation to the stationary blade. It may be preferable, therefore, that this portion of the gap be arranged to receive a plurality of hairs. During the cutting action, the hairs can sooner or later be guided out of the gap without significantly degrading the cutting performance.
[031] The span portion can be arranged between the first wall portion and the movable cutting blade. Consequently, the span portion may comprise a lower or rear span. The lower span or rear span can define a vertical span that has a vertical span span or lvg height span span. However, the span portion may be additionally disposed between the tips of the teeth of the stationary blade and the tips of the teeth of the movable cutting blade. Consequently, the span portion may comprise a front span or end span. The front span or end span may define a longitudinal span that has an extension of longitudinal span lfg. In some embodiments, the vertical span span lvg and the longitudinal span span lfg, if any, can be in the range of about 50 to about 250 μm (micrometers), preferably in the range of about 100 μm to about 2 00 μm, more preferably in the range of about 120 μm to about 180 μm.
[032] In general, the span portion can be arranged as a curved internal indentation in the guide slot. The curved indentation may comprise a flank adjacent to and extending from the projecting contact portion. The adjacent flank can be combined with a curved transition adjacent to the tooth tips of the movable cutting blade. In some embodiments, the curved transition can span the distance from the second wall portion to the first wall portion, thus forming the frontal span (end). In some embodiments, the curved transition can end at the second wall portion without extending to the first wall portion. Consequently, in these modalities, the curved transition does not necessarily define a frontal or end span.
[033] In one embodiment, the second wall portion may comprise a protruding bowl portion or opposite bowl portion. Since the span portion may be a recessed span portion that basically weakens the second wall portion, it may be preferred that material is added to the opposite side of the second wall portion. The protruding bulge can be arranged as an at least partial displacement of the span portion. Consequently, the wall thickness of the second wall portion can also be maintained in the span portion, at least substantially.
[034] The present disclosure also refers to a modality of a stationary blade that can be considered a beneficial exemplary refinement of any of the modalities and refinements described above in conjunction with the first aspect of the stationary blade in accordance with the present disclosure. However, this should not be interpreted as a limitation. Consequently, the modalities and refinements below in the alternative aspect may also be part of a separate aspect of the present disclosure or, at least in some respect, of a separate and distinct invention that can be claimed independently.
[035] According to the respective modality, the stationary blade additionally comprises a perforated section in which a plurality of perforations are provided, preferably a perforated section which is arranged in a central portion between a first toothed front edge and a second front edge jagged, with the perforations comprising at least partially sharp edges on the side of the first portion of the wall which faces the opposite side of the skin.
[036] Therefore, the above modality can be implemented separately in a stationary blade for a set of blades of a hair cutting device, and said set of blades is arranged to be moved through hair in a direction of movement to cut hairs, the stationary blade comprising: - a first portion of the wall arranged to serve as a wall facing the skin when in operation, - a second portion of the wall at least partially offset from the first portion of the wall, so that a the first wall portion and a second wall portion define between them a guide slot arranged to receive a movable cutting blade, - at least one toothed front edge comprising a plurality of teeth formed together by the first wall portion and the second wall portion , the first wall portion and the second wall portion being arranged to receive the movable cutting blade in the guide slot in one action. defined implementation.
[037] Thus, regardless of whether the modality that includes the perforations in the perforated region is actually implemented in the context of the main aspect of the present disclosure or in isolation, the ability to shave or shave the stationary blade by very close to the skin, particularly its shaving or waxing capacity can be further increased. In other words, how at least one notched front edge is defined jointly by the first wall portion and the second wall portion and how, in addition, a perforated region including a plurality of perforations is provided, by the considerably short hairs and therefore rigid, can also be cut or trimmed in the perforated region when the stationary blade acts in conjunction with a correspondingly shaped mobile cutting blade. In other words, the perforated region is not particularly suitable for trimming or shaving or epilation of the longest hairs, since the longest hairs hardly enter the respective perforations of the perforated region. However, as already emphasized earlier, since the stationary blade is particularly suitable for hair cutting devices that can be considered dual function hair cutting devices, which are suitably indicated for trimming and shaving or waxing operations, the total performance of the hair trimmer can be further improved.
[038] Preferably, a considerably simple arrangement comprising only a single stationary blade and a single integrally shaped movable cutting blade can provide, at respective longitudinal ends, at least one toothed front edge, particularly a first toothed front edge and a second front edge notches that are displaced from each other in the longitudinal direction. Consequently, a first hair cutting region arranged for trimming and shaving or waxing processes can be provided. In addition, a second hair cutting region can be provided separate from the first cutting region, but which can be arranged adjacent to the first cutting region.
[039] Although it is recognized, in this respect, that there are conventional hair clippers that implement a first cutting zone and a second cutting zone, the aspect that hair clippers in general require more than just two components is emphasized to define the first cutting region and the second cutting region. In other words, since both the first cutting region and the second cutting region typically at least two respective components act together to cut hairs, the respective prior art hair trimmers may, for example, require four respective components, two of which can be considered stationary or protective blades and two others which can be considered mobile cutting blades. For example, such prior art devices may implement a conventional shaving or shaving arrangement with metal foil and a conventional hair trimming arrangement, each of which is defined by two respective parts acting together. An exemplary embodiment of such a device is disclosed, for example, in patent DE 44 10 543 C1.
[040] In an additional modality of the alternative aspect above, the stationary blade is arranged to receive a mobile cutting blade that comprises a corresponding perforated section in order to jointly define a shaving or epilation region with integrated metal foil, with the cutting edges the perforations of the first portion of the wall are arranged to act in conjunction with corresponding cutting edges that are provided on the mobile cutting blade in a shear cutting action by means of the relative movement between the stationary blade and the mobile cutting blade. As a consequence, the overall appearance of a blade set that is assembled with a respective stationary blade and a respective cutting blade may resemble a conventional shaving head from a combined shaving or shaving apparatus for shaving or conventional shaving, as disclosed in DE 44 10 543 C1. However, in contrast to the respective prior art devices, a set of blades according to the present disclosure requires only, at least in some embodiments, two components acting together, namely, the stationary blade and the mobile cutting blade, each of which, on the other hand, it is supplied with cutting teeth and, on the other hand, with respective shaving or epilation perforations.
[041] As used here, the shaving or epilation region with integrated foil can be defined together by the metal component of the stationary blade that forms a substantial part of the first wall portion, and by the movable cutting blade. Consequently, the term “shaving or hair removal region with integrated metal foil” will not be interpreted in a limiting sense as necessarily requiring a (very thin) cutting foil on the side of the stationary foil. Instead, the first wall portion and / or the metal component thereof can be arranged in a sufficiently rigid (and therefore thick) manner to define considerably rigid teeth at the toothed anterior edge. Preferably, the thickness or height of the metal component is the same both at the toothed front edge and in the perforated region.
[042] In a further refinement of this aspect, the perforated section of the first wall portion comprises a pattern of perforations that are arranged as circular walls. In general, a width or, more explicitly, a (lateral) diameter of the perforations can be adapted to a (lateral) slit width of the slits which are formed between respective teeth of the cutting anterior edges extending laterally in the stationary blade. In general, the perforations may comprise a shape that is selected from the group consisting of a honeycomb-shaped orifice, circular orifice, longitudinally extending slit, oblique slit and combinations thereof. It is worth mentioning in this respect that the cutting action or cutting movement on at least one toothed anterior edge and on the perforated sections that can form the shaving or waxing region with metallic foil can be basically the same, since on the side of the stationary element and on the side of the movable element (“slider”) basically only one respective component is provided. Thus, also at the level of the perforated sections acting together, a lateral cutting movement may occur, particularly a reciprocating lateral cutting movement.
[043] In another aspect of the present invention, a set of blades is presented for a hair cutting apparatus, said blade set being arranged to be moved through the hairs in a direction of movement to cut the hairs, and that said set of blades comprises: - a stationary blade according to at least some aspects of the present disclosure, and - a movable cutting blade comprising at least one notched front edge, the movable cutting blade being arranged in a way that can move within the guide slot defined by the stationary blade, so that, by moving the movable cutting blade in relation to the stationary blade, the at least one notched front edge of the movable cutting blade acts in conjunction with corresponding teeth of the stationary blade to allow the cutting of hairs caught between the front edge and the teeth in a cutting action.
[044] It is particularly preferable that the blade set consists of the stationary blade and the movable cutting blade. This may involve a driving force transmitting member for the movable cutter blade. However, it is particularly preferred that the movable cutting blade is arranged in the guide slot without being flexed by a separate flexing member, as a spring-loaded flexing element. It is additionally preferred that other mounting elements or a movable blade fastening element can be omitted. Consequently, it is preferred that an upper side of the movable cutting blade contacts the first wall portion and that a lower side (or rear side) of the movable cutting blade contacts the second wall portion.
[045] It is evident that the movable cutting blade can be arranged in the guide slot with a certain gap or fit in relation to the first wall portion and the second wall portion, respectively, since the movable cutting blade is preferably , slidably arranged in the guide slot. As used here, relative motion may involve the reciprocating motion of the movable cutting blade relative to the stationary blade. In some embodiments, the relative movement may involve the rotation of the movable blade in relation to the cutter blade.
[046] In a set of blades, the mobile cutting blade comes into direct contact, on one side of it facing the skin, with the first portion of the wall and, on one side facing the opposite side of the skin, with the second wall portion, particularly in the at least one protruding contact portion.
[047] In a blade set modality, the stationary blade is, when viewed in a plane in cross section perpendicular to a lateral Y direction, at least partially flexed backwards so that the mobile cutting blade contacts sectionally with the the first wall portion and the second wall portion, with a contact area between the movable cutting blade and the first wall portion being displaced longitudinally from a contact area between the movable cutting blade and the second wall portion. Preferably, the stationary blade is arched or has an arched shape. The desired deformation may be a result of the distortion related to the mold of the plastic component of the stationary blade. Preferably, two respective sets of contact surfaces are provided at opposite cutting edges of the stationary blade disposed in opposition. Preferably, the contact surfaces are relatively small in relation to a total surface of the movable cutting blade. Contact surfaces may involve relatively narrow line contact surfaces. The stationary blade may comprise a basically convex shape, when viewed from a top view. In this way, the stationary blade can act as a spring, particularly a flat spring element. The movable cutting blade can be arranged without considerable play in the guide slot. The mobile cutting blade can be slightly preloaded as a result of deformation of the stationary blade.
[048] In a blade set mode, the movable cutter blade is flexed forward when viewed in a plane in cross section perpendicular to the lateral Y direction, so that the movable cutter blade is received in the guide slot in a vertically condition preloaded and slightly flexed. Consequently, when viewed from a top view, the movable cutting blade can comprise a basically concave shape. Thus, the movable cutting blade can also act as a spring, particularly a flat spring element. The movable cutting blade can be arranged without considerable play in the guide slot. The movable cutter blade can be slightly preloaded. It is evident that the modalities described above in relation to induced deformations of the stationary blade and the movable cutting blade can also be combined.
[049] In a blade set modality, the movable cutting blade comprises, at least one toothed anterior edge of the same, upper cutting edges that are configured to act in conjunction with cutting edges on the first portion of the wall, and lower cutting edges which are configured to act in conjunction with lower cutting edges on the second wall portion.
[050] This configuration can have the advantage that the hairs, particularly the cut hairs, can be prevented from entering a gap between the second wall portion and the movable cutting blade. There is a possibility that a small gap will be provided on the underside of the movable cutting blade in the area of the toothed anterior edge, since the movable cutting blade is basically forced against the first portion of the wall and can therefore be at least sectionally raised. from the second wall portion. Hairs can become trapped in the gap causing an accumulation of debris in the gap. Therefore, the operation of the blade set may be compromised. By providing the blade set with the ability to cut hair on the top and bottom sides of the movable blade, the amount of hair stuck can be greatly reduced. It is worth mentioning in this regard that, although the lower cutting edges on the second wall portion may be formed by the plastic component, the stationary blade and the movable cutting blade can generate considerable shearing forces and, as a result, cut through the hairs. on the underside of the movable cutter blade.
[051] As in the alternative mode of the stationary blade discussed earlier in the present disclosure, the blade set can also be refined by adding perforated sections at the end of the blade set and the movable cutting blade to form a shaving region or epilation with integrated foil. Consequently, in an additional embodiment of the blade set discussed above, which can be considered a beneficial refinement and, furthermore, as another aspect of the present disclosure which may alternatively also be part of a separate invention, the mobile cutter blade comprises a perforated section that is adapted to a perforated section of the stationary blade, with a plurality of perforations being provided in the perforated section, and the perforations of the movable cutting blade comprise, at least partially, sharp edges on the side facing the skin of the mobile cutting blade.
[052] As indicated above, the blade set design, particularly the stationary blade design, allows the mounting of the movable cutting blade in the guide slot that is defined in the stationary blade in a defined coupling. In this way, it is possible to profit from the respective coupling with a tight clearance fitting. Preferably, the skin-facing side of the mobile cutting blade and the side of the first wall portion of the stationary blade that faces the opposite side of the skin are in close contact, particularly in narrow surface contact. This, on the other hand, applies to jagged cutting edges, where the respective teeth of the mobile cutting blade and the stationary blade can act together to cut or trim hair. On the other hand, this can also apply to the respective perforated sections that are preferably arranged in a central region between the respective teeth that are formed at the longitudinal ends of the blades. In this way, with little additional effort, the shaving or shaving capacity of the blade set can be significantly improved. In addition, in a respective hair trimming mode where, typically, the longest hairs are cut at a defined distance from the skin level, the perforated sections do not degrade or impair the hair trimming performance.
[053] In other words, a main advantage of the alternative aspect of the set of blades that is provided with a first type of cutting region and a second type of cutting region is that the metal sheet-like cutting region that is arranged in a central portion of the side facing the skin for improving the shaving or waxing ability, while at least one toothed anterior edge, preferably the first and second toothed anterior edges that are arranged at the longitudinal ends extending laterally from the blade set can enhance the trimming ability of the blade set. In general, trimming may require sufficient visibility of the portion of hair or beard to be processed. In contrast, shaving or waxing generally does not require considerable visibility of the portion of skin to be processed. In this way, the central portion of the blade set can be advantageously used for shaving or shaving with metal foil.
[054] The inherent characteristics of the plastic component material can be used in order to provide an internal or inherent suspension that forces the metal component in the desired path for close contact with the movable cutting blade. As an example, given a side view in cross section of the blade set, a definite line contact between cutting or contact surfaces of the movable cutting blade and the metal component that forms a substantial portion of the first portion is desirable of Wall. Preferably, in the respective zones or areas (that is, on at least one toothed anterior edge and in the region of shaving or waxing with metal foil), a defined level of contact force between the mobile cutting blade and the cutting component can be obtained. metal. In areas of the first wall portion and the movable cutting blade where no cutting edge is provided, the respective contact force may be less.
[055] In general, as the movable cutting blade and the first portion of the wall, particularly the metal component of the same, are moved relative to each other to allow the cutting action, heat generation occurs as the blade mobile cutter slides in relation to the stationary blade. In order to reduce the level of heat generated, it may be preferable in at least some modalities to further process at least one of the movable cutting blade or the metal component for the first wall portion. Corresponding processing may involve material removal processes. For this purpose, for example, a chemical attack process or a similar electrochemical machining (ECM) method can be used. As an example, at least one of the contact surfaces of the movable cutting blade and the metal component facing each other can be processed to remove material in regions thereof that are not required for the cutting operation. In other words, the movable cutting blade and / or the metal component of the first wall portion can be at least partially or sectionally thinned in regions where no cutting edge (or corresponding tooth or perforation) is provided. Consequently, even better contact at the cutting edges can be obtained. In addition, since an effective contact surface or area can be reduced in this way, the level of heat generation can also be reduced.
[056] An additional benefit of the shaving or shaving region with metal foil may be the improvement of the slide set's ability to slide, particularly the top surface facing the skin on the skin surface. In some applications, particularly when shaving or waxing portions of the skin with relatively short, spiky hair, short, spiky hair that cannot be attached and removed at the cutting edges can impair a sliding movement of the blade set across the skin. . Therefore, it may be beneficial to provide a respective shaving or epilation region with metal foil in order to allow the respective operations and shaving or epilation on the central portion of the top surface of the blade set in order to soften the skin.
[057] In a further refinement of the perforated mobile cutter blade of the blade set, in the assembled state, a “territorial” surface contact is provided between the perforated section of the mobile cutter blade and the perforated section of the stationary blade. Consequently, hairs can be prevented from entering a respective gap between the stationary blade and the mobile cutting blade, which could have a negative impact on cutting performance and the user experience. As used here, a territorial surface contact can be considered as a sufficiently large contact area between the mobile cutting blade and the stationary blade in its perforated sections. In other words, as used here, a territorial surface contact is not just a point contact or a line contact, but a surface contact that defines a sufficiently large contact surface between the blades in contact. Furthermore, it is preferable that the surface contact is also maintained in the course of the cutting operations when the stationary blade and the movable cutting blade are moved in relation to each other.
[058] According to another modality of the set of blades, when seen in a plane in cross-section perpendicular to the lateral direction, the first portion of the wall and the movable cutting blade are curved in a convex manner, with the first portion of the wall and the movable cutting blade are, in an uninflected state, curved differently. This modality is based on the perception that the desired surface contact between the mobile cutting blade and the first wall portion of the stationary blade can be achieved by deliberately shaping the components in an uneven or non-flat manner and flexing the components in a defined manner. in the assembled state so that the movable cutting blade and the first portion of the wall come into close contact with the surface. It can be beneficial to allow differently curved geometries on the first wall portion and on the movable cutting blade, since in this way, the desired contact state can be reliably obtained by applying a respective bending force, as already indicated above. . As already explained above, at least a substantial portion of the first wall portion of the stationary blade is formed by the metal component, particularly a respective metal sheet. Thus, at the level of the stationary blade, the desired curved shape in the non-flexed state is preferably provided in the metal component.
[059] In yet another refinement of the modality that includes perforations of the blade set, in the non-flexed state, the curvature of the first wall portion, particularly of the metal component, is different from a curvature of the movable cutting blade, being that, in the mounted state, the movable cutting blade and the first wall portion are flexed against each other so that the movable cutting blade and the first wall portion come into contact territorially (in a distributed manner). The different curvatures can be present, at least partially, along the respective longitudinal extension of the movable cutting blade and the metal component that forms a substantial portion of the first wall portion. Preferably, the respective radius of curvature present in the first wall portion is different from the radius of curvature present in the movable cutting blade. In some embodiments, the non-flexed state mentioned here can be considered an imaginary non-flexed state, since the movable cutting blade and particularly the first wall portion or, more specifically, the metal component need not necessarily be present in isolation in the shape described and defined in the course of the manufacturing process. Therefore, in some modality, the non-inflected state can be considered an imaginary state that would be present in the case and the components already assembled or already molded are separate from each other.
[060] Preferably, both the first wall portion and the movable cutting blade are convexly shaped. Therefore, if the radius of curvature of the movable cutting blade is less than the radius of curvature of the metal component that forms the first wall portion, in the non-flexed state a line contact in the central regions, particularly in the perforated sections of the components , would be allowed. As a consequence, for example, the respective longitudinal ends of the movable cutting blade need to be forced or flexed against the corresponding longitudinal ends of the metal component in order to increase the contact area. In the event that the radius of curvature of the movable cutting blade is greater than the radius of curvature of the metal component, in the flexed state basically two line contacts between the components would be permitted at the respective longitudinal ends of the same, particularly adjacent to or in the respective teeth . Consequently, in the assembled state, the central portion of the movable cutting blade should be flexed or forced against the corresponding portion of the metal component in order to obtain the desired contact surface.
[061] In another aspect of the present invention, a method of fabricating a stationary metal-plastic composite blade from a set of blades for a hair cutting apparatus is presented, the method comprising the following steps: - providing a metal component, particularly a laminar metal component, which forms at least substantially a central portion of a first wall portion, - providing a mold, particularly an injection mold, the mold defining a shape of a plastic component , - arranging the metal component in the mold, - providing a replacement component in the mold, the replacement component being configured to keep a guide slot to be formed from the stationary blade clean during molding, the replacement component being adapted to an expected vertical thickness dimension lt of a movable cutting blade to be assembled, - forming, particularly via injection molding, the plastic component, being whereas the plastic component and the metal component define a first wall portion and a second wall portion of the stationary blade, the first wall portion being arranged to serve as a skin-facing wall when in operation, the second the wall portion is displaced at least partially in relation to the first wall portion, so that the first wall portion and the second wall portion define between them the guide slit of the movable cutting blade, the first wall portion being the second wall portion together form at least one notched front edge comprising a plurality of teeth, and the first wall portion and the second wall portion allow a definite coupling of the movable cutting blade to the guide slot of the stationary blade, - remove the replacement component from the metal-plastic composite stationary blade.
[062] The replacement component can be arranged as a moving element of the stationary blade mold. Alternatively, the replacement component can be formed as a separate component that can be inserted into the mold and removed from it together with the stationary blade after molding. In general, the replacement component can be arranged as a reusable replacement component. However, in some embodiments, the replacement component can be disposed of as a non-reusable replacement component that can also be called a lost core.
[063] In a method modality, the formation stage of the plastic component comprises the induction of residual stresses related to distortion in the stationary blade, particularly in the plastic component of the same, being that the stationary blade is, when viewed in a plane in cross section perpendicular to a lateral Y direction, at least partially flexed backwards after cooling so that the movable cutting blade contacts sectionally with the first wall portion and the second wall portion.
[064] In a method embodiment, the step of supplying the substitute component in the mold comprises at least one of the following steps: - providing at least one lateral movable element in the mold that defines the guide slit of the mobile cutting blade, and - dispose of a separate “dummy” (filling) component in the mold, particularly a reusable “dummy” component, which component is removed from the metal-plastic composite stationary blade outside the mold.
[065] In an additional embodiment of the manufacturing method, the processing step of the metal component is provided which includes the formation of a perforated section comprising a plurality of perforations in the central region of the metal component in order to define a shaving region or hair removal with foil.
[066] In another aspect of the present invention, a method of manufacturing a set of blades for a hair cutting apparatus is presented, the method comprising the following steps: - making a stationary blade according to at least some aspects of the method of making the stationary blade according to the present disclosure, - providing a movable cutting blade that comprises at least one toothed anterior edge arranged to act in conjunction with at least one respective toothed anterior edge of the stationary blade, and - inserting a movable cutting blade in the guide slot of the stationary blade, particularly passing the movable cutting blade through a lateral opening of the stationary blade.
[067] In an additional step, which can be performed upstream of the step of supplying the mobile cutting blade, the mobile cutting blade can be manufactured. This may involve processing the movable cutting blade which includes forming a perforated section comprising a plurality of perforations in the central region of the movable cutting blade in order to define, acting in conjunction with the stationary blade, a shaving or shaving region with foil. metallic.
[068] The preferred embodiments of the invention are defined in the dependent claims. It should be understood that the claimed method has preferential modalities similar and / or identical to the claimed device and as defined in the dependent claims. Brief description of the drawings
[069] These and other aspects of the invention will become evident and will be elucidated with reference to the modalities described below. In the following drawings:
[070] Figure 1 shows a schematic perspective view of an exemplary electric hair cutter equipped with an exemplary version of a set of blades, in accordance with the present disclosure;
[071] Figure 2 shows a schematic top view of a cutting head comprising a set of blades according to the present disclosure, the cutting head being fixed to an articulated connection mechanism;
[072] Figure 3 is an exploded perspective bottom view of the slide set shown in Figure 2;
[073] Figure 4 is a partial top view of a stationary blade from the blade set shown in Figure 2, the hidden edges of the stationary blade being shown for illustration purposes;
[074] Figure 5 is a bottom perspective view in partial perspective of a metal component of the blade set shown in Figure 3;
[075] Figure 6 is a cross-sectional view of the stationary blade shown in Figure 4 taken along line VI-VI in Figure 4;
[076] Figure 7 is a side view in partial cross section of the stationary blade shown in Figure 4 taken along line VII-VII in Figure 4;
[077] Figure 8 is an enlarged detailed view of the stationary blade shown in Figure 6 on a front edge portion thereof;
[078] Figure 9 is an enlarged detailed view of the metal component of the stationary blade corresponding basically to the view in Figure 8;
[079] Figure 10 is a bottom perspective view of a plastic component of the stationary blade shown in Figures 2 and 3;
[080] Figure 11 is a top perspective view of the plastic component shown in Figure 10;
[081] Figure 12 is a partial top view of the blade set shown in Figures 2 and 3, the hidden contours of a movable cutter blade in the set being indicated by dashed lines mainly for illustration purposes;
[082] Figure 13 is a cross-sectional side view of the blade set shown in Figure 12 taken along line VIII-VIII in Figure 12;
[083] Figure 14 is another cross-sectional side view of the blade set shown in Figure 12 taken along line XIV-XIV in Figure 12;
[084] Figure 15 is a simplified side view of a stationary blade modality according to Figure 15 in a basically neutral configuration;
[085] Figure 16 is another side view of a stationary blade, with the stationary blade being shown in a slightly deformed configuration (deformations are shown exaggerated);
[086] Figure 17 is a side view of a mobile cutting blade configured to act in conjunction with the stationary blade shown in Figure 16, the resulting contact forces being indicated in Figure 17 by block-type arrows;
[087] Figure 18a shows a side view in cross section of a set of exemplary blades according to the present disclosure, on a toothed anterior edge of the stationary blade of the same, the cross section being located on a tooth of the same;
[088] Figure 18b shows another lateral view in cross section of a set of exemplary blades according to the present disclosure, on a toothed anterior edge of the stationary blade of the same, the cross section being located on a tooth of the same ;
[089] Figure 18c shows yet another lateral view in cross section of an exemplary blade set according to the present disclosure, on a toothed anterior edge of the stationary blade of the same, the cross section being located on a tooth of the same ;
[090] Figure 19 shows a side view of the movable cutting blade that is configured to act in conjunction with a stationary blade according to one embodiment of the present disclosure, with the movable cutting blade shown in a basically flat state;
[091] Figure 20 shows yet another side view of a mobile cutting blade, the mobile cutting blade being shown in a slightly deformed state (exaggerated representation of the deformation);
[092] Figure 21 is yet another side view of a set of blades that includes a stationary blade and a movable cutter blade formed according to the modality illustrated in Figure 20, with a defined coupling of the movable cutter blade to the blade provided. stationary;
[093] Figure 22 is a partial bottom view of a set of blades on an anterior edge of the same, the set of blades including a movable cutting blade and a stationary blade;
[094] Figure 23 is a front view in enlarged cross section of the set of blades shown in Figure 22 taken along line XXIII-XXIII in Figure 22;
[095] Figure 24 is another front view in partial cross section of a blade set that includes a stationary blade and a modified movable cutting blade shown in an orientation that basically corresponds to the view shown in Figure 24;
[096] Figure 25 is a partial front view of the movable cutting blade illustrated in Figure 24;
[097] Figure 26 is a side view in partial cross section of yet another modality of a stationary blade according to the present disclosure through a respective tooth;
[098] Figure 27 is a side view in partial cross section of yet another modality of a set of blades according to the present disclosure through the respective teeth of a stationary blade and a mobile cutting blade thereof;
[099] Figure 28 is an exploded top view of an alternative embodiment of a set of blades according to at least some aspects of the present disclosure;
[0100] Figure 29 is an exploded top view of the blade set shown in Figure 28;
[0101] Figure 30 is a side view in cross section of the blade set shown in Figures 28 and 29;
[0102] Figure 31 is a top perspective view in partial perspective of the blade set shown in Figures 28 and 29;
[0103] Figure 32 is a bottom perspective view of an alternative arrangement of a movable cutting blade for the blade set shown in Figures 28 to 31;
[0104] Figure 33 is a bottom perspective view of another alternative embodiment of a movable cutting blade for the set of blades shown in Figures 28 to 31;
[0105] Figure 34 is a simplified schematic side view of a movable cutter blade and a metal component for a first wall portion of a stationary blade set of blades, the movable cutter blade and the component of metal are shown in a flat state;
[0106] Figure 35 is another simplified schematic side view of a movable cutting blade and a metal component for a first wall portion of a stationary blade, with the movable cutting blade and the metal component being curved to the side. along its longitudinal extension;
[0107] Figure 36 is a side view in cross section of another alternative modality of a set of blades, with the set of blades implementing the movable cutting blade and the metal component as shown in Figure 35, being that the movable cutting blade and the metal component are flexed for surface contact;
[0108] Figure 37 is another simplified schematic side view of a movable cutting blade and a metal component for a first wall portion of a stationary blade, with the movable cutting blade and the metal component being curved to the side. along its longitudinal extension; and
[0109] Figure 38 is a side view in cross section of another alternative form of a blade set, the blade set implementing a movable cutting blade and the metal component as shown in Figure 35, being that the movable cutting blade and the metal component are flexed for surface contact. Detailed description of the invention
[0110] Figure 1 schematically illustrates, in a simplified perspective view, an exemplary embodiment of a hair cutting apparatus 10, particularly an electric hair cutting apparatus 10. The cutting apparatus 10 may comprise a housing 12, a motor indicated by a dashed block 14 in the housing 12 and a drive mechanism or transmission system indicated by a dashed block 16 in the housing 12. To power the motor 14, at least in some embodiments of the cutting device 10, an electric battery, indicated by a dashed block 17 in the housing 12, such as a rechargeable battery, a replaceable battery, etc., can be provided. However, in some embodiments, the cutting device 10 can also be provided with a power cable for connection to a power supply. A power supply connector can be provided in addition to or as an alternative to the electric (internal) battery 17.
[0111] The cutting device 10 can additionally comprise a cutting head 18. On the cutting head 18, a set of blades 20 can be attached to the hair cutting device 10. The set of blades 20 can be driven by the motor 14 through the drive mechanism or transmission system 16 to allow a cutting movement. The cutting movement can, in general, be considered as a relative movement between a stationary blade 22 and a movable blade 24 which are shown and illustrated in more detail in Figure 3, for example, and will be described and discussed below. In general, a user can manually pick up, hold and guide the shaving device 10 through the hairs in a direction of movement 28 to cut the hairs. The cutting apparatus 10 can generally be regarded as a hand-guided and operated electrical device. In addition, the cutting head 18 or, more specifically, the set of blades 20 can be pivotally connected to the housing 12 of the cutting apparatus 10 (see double curved arrow indicated by reference number 26 in Figure 1). In some applications, the cutting apparatus 10 or, more specifically, the cutting head 18 including the set of blades 20 can be moved along the skin to cut the hairs that grow on it. When the hair is cut close to the skin, a shaving or epilation operation can basically be performed, aiming to cut (or shave) the hair at the level of the skin. However, cutting (or trimming) operations can also be contemplated, with the cutting head 18 comprising the set of blades 20 being passed along a path at a desired distance from the skin.
[0112] When moved in a guided way through the hairs, the cutting apparatus 10 that includes the set of blades 20 is normally moved along a common direction of movement which is indicated by reference number 28 in Figure 1. It is worth mentioning in this regard that, since the hair cutting apparatus 10 is typically guided and moved manually, the direction of movement 28 does not therefore need to be necessarily interpreted as a precise geometric reference that has a fixed definition and a respectful relationship. the orientation of the shaving device 10 and its shaving head 18 equipped with the blade set 20. That is, a general orientation of the shaving device 10 in relation to the hairs to be cut on the skin can be interpreted as somewhat unstable . However, for purposes of illustration, it can be assumed with a reasonable degree of confidence that the (imaginary) direction of movement 28 is parallel (or generically parallel) to a main central plane of a coordinate system that can serve, in the following text , as a means of describing structural characteristics of the hair trimmer 10.
[0113] For ease of reference, coordinate systems are indicated in several drawings in this document. As an example, a Cartesian X-Y-Z coordinate system is shown in Figure 1. An X axis of the respective coordinate system extends in a generally longitudinal direction generally associated with length, for the purposes of this disclosure. A Y axis of the respective coordinate system extends in a lateral (or transverse) direction, usually associated with width, for the purposes of this disclosure. A Z axis of the coordinate system extends in a height (or vertical) direction that can be considered for illustrative purposes only, at least in some modalities, as a generally vertical direction. Of course, an association of the X-Y-Z coordinate system with characteristic features and / or modalities of the hair cutting apparatus 10 is provided primarily for purposes of illustration and will not be interpreted in a limiting way. It should be understood that those skilled in the art can readily convert and / or transfer the coordinate system provided here when confronting alternative modalities, the respective figures and illustrations that include different orientations. It is also worth mentioning that, for the purpose of the present disclosure, the X-Y-Z coordinate system is generally aligned with the main directions and orientations of the cutting head 18, which includes the blade set 20.
[0114] Figure 2 illustrates a top perspective view of an exemplary embodiment of the shaving head 18 that can be attached to the hair shaver as shown in Figure 1. The shaving head 18 is supplied with the blade set 20, as previously indicated. The blade set 20 includes a stationary blade 22 and a movable cutting blade 24 (hidden in Figure 2). In this regard, additional reference is made to the exploded view of the blade set 20 shown in Figure 3. The stationary blade 22 and the mobile cutting blade 24 are configured to be moved relative to each other, thus cutting hairs on their respective edges. sharp.
[0115] The stationary blade 22 further comprises a top surface 32 which can be considered as a skin-facing surface. Typically, when in operation as a shaving or shaving device, the hair shaving device 10 is oriented in such a way that the top surface 32 is basically parallel or slightly inclined with respect to the skin. However, alternative modes of operation can also be contemplated, in which the top surface 32 is not necessarily kept parallel or, at least, substantially parallel to the skin. For example, the hair cutting apparatus 10 can also be used for shaving or, more generally, hair treatment. The hair design can be aimed at processing considerably sharp edges or transitions between differently treated hair portions or beard portions. For example, hair treatment may involve the precise shaping of sideburns or other distinct portions of facial hair. Consequently, when used in a treatment mode, the top surface 32 and the portion of skin to be treated are arranged at an angle and substantially perpendicular to each other.
[0116] However, mainly for illustrative purposes only, the top surface 32 and the similarly oriented hair trimmer parts and components 10 can be considered in the present description as skin-facing components and portions. Consequently, the elements and portions that are oriented in the opposite way can be considered as elements and portions oriented backwards or more precisely as elements and portions facing the opposite side of the skin, for the purposes of this disclosure.
[0117] As already indicated, the stationary blade 22 can define at least one notched anterior edge 30. As shown in Figure 2, the stationary blade 22 can define a first anterior edge 30a and a second anterior edge 30b which are offset one from the other. another in the longitudinal direction X. The at least one toothed front edge 30a, 30b can extend generally in the lateral direction Y. The top surface 32 can be considered as a surface that is generally parallel to a plane defined by the longitudinal direction X and the lateral direction Y. On at least one toothed front edge 30, a plurality of teeth 36 of the stationary blade 22 can be provided. The teeth 36 can alternate with the respective tooth slots. The crevices of teeth can define gaps between teeth 36. Hairs can enter the gaps when the hair trimmer 10 is moved through the hairs in the direction of movement 28 (see Figure 1).
[0118] The stationary blade 22 can be arranged as a metal-plastic composite component, for example. In other words, the stationary blade 22 can be obtained from a multi-stage fabrication method that can include providing a metal component 40 (see also Figure 3) and forming or, more precisely, molding a plastic component 38 that includes connecting the metal component 40 and the plastic component 38. This may particularly involve the formation of a stationary blade 22 using an insert molding process, an external molding process (“outsert”) or an overlapping molding. In general, the stationary blade 22 can be considered a two-component stationary blade 22. However, since the stationary blade 22 is preferably formed by an integrated manufacturing process, basically no conventional assembly steps are required during the formation of the stationary blade 22. Instead, the integrated manufacturing process may include a manufacturing step with the final shape (“net-shape”) or, at least, a manufacturing process with the shape close to the final one (“near-net”). -shape ”). For example, the molding of the plastic component 38, which may also include the connection of the plastic component 38 to the metal component 40, can readily define a configuration with a shape close to the definitive one (“near-net-shape”) or with the final shape (“net-shape”) of the stationary blade 22. It is particularly preferable that the metal component 40 is made from sheet metal. It is particularly preferred that the plastic component 38 is made from injection moldable plastic material.
[0119] Forming the stationary blade 22 from different components, particularly forming the stationary blade 22 integrally can additionally have the advantage that portions of it that need to withstand high loads during operation can be formed of respective high-strength materials (for example, metallic materials), while portions of it that are not generally exposed to high loads when in operation can be formed from different materials, which can significantly reduce manufacturing costs. Forming the stationary blade 22 as a metal-plastic composite piece can additionally have the advantage that contact with the skin can be a more comfortable experience for the user. In particular, the plastic component 38 can exhibit a greatly reduced thermal conductivity compared to the metal component 40. Consequently, the heat sensation perceived by the user during the hair cutting operation can be reduced. In conventional hair cutting devices, heat generation can be considered a major barrier to increased cutting performance. The generation of heat basically limits the power and / or the cutting speed of hair cutting devices. The simple addition of thermally insulating materials (for example, plastic materials) can significantly reduce the heat transfer from the heat generating points (for example, the cutting edges) to the user's skin. This applies in particular to the tooth tips 36 of the stationary blade 22 which can be formed of plastic material.
[0120] Forming the stationary blade 22 as an integrally formed metal-plastic composite piece can additionally have the advantage that other functions can be added to the design of the stationary blade 22. In other words, the stationary blade 22 can provide enhanced functionality without the need to fix or assemble other components to it.
[0121] As an example, the plastic component 38 of the stationary blade 22 can be mounted with side protection elements 42 which can also be considered as, so-called, side protectors. The side protection elements 42 can cover the lateral ends of the stationary blade 22 (see also Figures 3 and 10). Consequently, direct contact with the skin at the relatively sharp side ends of the metal component 40 can be avoided. This can be particularly beneficial since the metal component 40 of the stationary blade 22 is relatively thin in order to allow hair to be cut close to the skin during shaving or epilation. However, at the same time, the relatively thin arrangement of the metal component 40 could cause skin irritation by sliding over the skin surface during shaving or epilation. Specifically, since the skin contact portion of metal component 40 can actually be so thin that relatively sharp edges can remain, the risk of skin irritation or even cuts in the skin can be greater the thinner the metal component 40 is. , and the stationary blade 22 really is. It is, therefore, preferable, at least in some modalities, to shield the sides of the metal component 40. The side protection elements 42 can be projected from the top surface in the vertical direction or height direction Z. The at least one protection element side 42 can be formed as an integrated part of the plastic component 38.
[0122] The stationary blade 22 can be additionally provided with mounting elements 48 that can allow its fast attachment and release of the articulated connection mechanism 50. The mounting elements 48 can be arranged in the plastic component 38, particularly formed integrally with the plastic component 38 (see also Figures 3 and 10). The mounting elements 48 can comprise mounting protrusions, particularly snap-fit mounting elements. The mounting elements 48 can be configured to act in conjunction with the respective mounting elements on the hinge connection mechanism 50. It is particularly preferred that the set of blades 20 can be attached to the hinge connection mechanism 50 without any other separate fastening element.
[0123] The hinged link mechanism 50 (see Figure 2) can connect the blade set 20 and the housing 12 of the hair clipper 10. The hinged link mechanism 50 can be configured so that the set of blades 20 can rotate or articulate during operation when guided through hair. The articulated link mechanism 50 can provide the blade set 20 with an ability to follow contours. In some embodiments, the articulated link mechanism 50 is arranged as a four-bar mechanism. This can enable a definite pivoting feature of the blade set 20. The hinge mechanism 50 can define a virtual pivot axis for the blade set 20.
[0124] Figure 2 further illustrates an eccentric coupling mechanism 58. The eccentric coupling mechanism 58 can be considered a part of the drive mechanism or transmission system 16 of the hair clipper 10. The eccentric coupling mechanism 58 it can be arranged to transform a rotating drive movement (see curved arrow indicated by reference number 64 in Figure 2) into a reciprocal movement of the movable blade 24 in relation to the stationary blade 22 (in this regard, also see double arrow indicated by the number reference 126 Figure 12). The eccentric coupling mechanism 58 may comprise a drive shaft 60 which is configured to be driven to rotate about an axis 62. At the front end of the drive shaft 60 facing the blade assembly 22 an eccentric portion 66 can be provided The eccentric portion 66 may comprise a cylindrical portion that is displaced from the (central) shaft 62. By rotating the drive shaft 60, the eccentric portion 66 may rotate about the axis 62. The eccentric portion 66 is arranged to engage a transmission member 70 that can be fixed to the movable blade 24.
[0125] Still with reference to the exploded view shown in Figure 3, the transmission member 70 will be described in detail. The transmission member 70 can comprise a reciprocating element 72 that can be configured to be engaged by the eccentric portion 66 of the transmission shaft 60 (see also Figure 2). Consequently, the reciprocating element 72 can be reciprocally driven by the transmission shaft 60. The transmission member 70 may additionally comprise a bridge connector 74 that can be configured for contact with the movable blade 24, particularly a main portion 78 thereof. . As an example, the bridge connector 74 can be connected to the movable cutting blade 24. The connection can involve brazing, welding and similar processes. However, at least in some embodiments, the bridge connector 74 or a similar connector element of the transmission member 70 may instead be attached to the movable cutting blade 24. As used here, the attachment may involve inlaying, compression, pressing or similar assembly operations. The transmission member 70 can additionally comprise a mounting element 76 that can be arranged on the bridge connector 74. On the mounting element 76, the reciprocating element 72 can be attached to the bridge connector 74. For example, the connector-bridge bridge 74 and mounting element 76 can be arranged as a metal piece. For example, the reciprocating element 72 can be arranged as a piece of plastic. For example, the mounting element 76 may involve snap-fit elements to secure the reciprocating element 72 to the bridge connector 74. However, in an alternative embodiment, the mounting element 76 can be considered an anchoring element for the reciprocating element. 72 when it is firmly connected to the bridge connector 74.
[0126] It is worth mentioning in this regard that the transmission member 70 can be arranged mainly to transmit a reciprocating drive movement lateral to the movable cutting blade 24. However, the transmission member 70 can be additionally arranged to serve as a prevention device of losses for the mobile cutter blade 24 in the blade set 20.
[0127] Figure 3 further illustrates the plastic component 38 and the metal component 40 of the stationary blade 22 in an exploded view. It is worth mentioning in this regard that, as it is preferred that the stationary blade 22 is integrally formed, the plastic component 38 of the same typically does not exist as such in an exclusive isolated state. Instead, at least in some embodiments, the formation of the plastic component 38 may necessarily involve the firm attachment of the plastic component 38 to the metal component 40.
[0128] The stationary blade 22 may comprise at least one side opening 68 through which the movable cutting blade 24 can be inserted. Consequently, the mobile cutting blade can be inserted in the lateral Y direction. However, at least in some embodiments, the transmission member 70 can be moved to the mobile cutting blade 24 basically along the vertical Z direction. The coupling of the mobile cutting blade 24 and the transmission member 70 can therefore involve first inserting the mobile cutting blade 24 through the side opening 68 of the stationary blade 22 and then, when the mobile cutting blade 24 is arranged on the stationary blade 22, feeding or moving the cutting member transmission along the vertical direction Z to the stationary blade 22 so as to be connected to the movable cutting blade 24.
[0129] In general, the movable cutter blade 24 may comprise at least one notched front edge 80 adjacent to the main portion 78. In particular, the movable cutter blade 24 may comprise a first anterior edge 80a and a second anterior edge 80b which is longitudinally displaced from the first anterior edge 80a. At the at least one front edge 80, a plurality of teeth 82 can be formed which alternate with respective tooth slits. Each of the teeth 82 can be provided with respective cutting edges 84, particularly on its lateral flanks. The at least one serrated leading edge 80 of the movable cutting blade 24 can be arranged to act in conjunction with a respective serrated leading edge 30 of the stationary blade 22 when the relative movement of the movable cutting blade 24 and the stationary blade 22 is induced. Consequently, the teeth 36 of the stationary blade 22 and the teeth 82 of the mobile cutting blade 24 can act together to cut hairs.
[0130] With specific reference to Figures 4 to 9, the structure and configuration of an exemplary embodiment of the stationary blade 22 will be detailed and described. Figure 4 is a partial top view of the stationary blade 22, with the hidden portions of the metal component 40 (see also Figure 5) are shown for illustration purposes. In the teeth 36 of the stationary blade 22, tips 86 can be formed. The tips 86 can be formed mainly by the plastic component 38. However, substantial portions of the teeth 36 can be formed by the metal component 40. As can be best seen in Figure 5 , the metal component 40 can comprise the so-called tooth shank portions 88 which can form a substantial portion of the teeth 36. The tooth shank portions 88 can be provided with respective cutting edges 94 which are configured to act in conjunction with the cutting edges 84 of the teeth 82 of the movable cutting blade 24. At the longitudinal ends of the tooth shank portions 88, anchoring elements 90 can be arranged. The anchoring elements 90 can be considered positive locking contact elements that can further reinforce the connection of the metal component 40 and the plastic component 38.
[0131] For example, the anchoring elements 90 can be provided with lower cuts or recessed portions. Consequently, the anchoring elements 90 can be arranged as barbed anchoring elements. Preferably, a respective portion of the plastic component 38 that contacts the anchoring elements 90 cannot be separated or released from the metal component 40 without being damaged or even destroyed. In other words, the plastic component 38 can be inextricably linked to the metal component 40. As shown in Figure 5, the anchoring elements 90 can be provided with recesses or holes 92. The holes 92 can be arranged as slit holes, for example. During the assembly of the plastic component 38, the plastic material can enter the holes 92. As can best be seen in Figures 6 and 8, the plastic material can fill the recesses or holes 92 of the anchoring elements 90 from both sides (vertical), that is, from the top side and the bottom side. Consequently, the anchoring elements 90 can be completely covered by the plastic component 38. Spikes 86 can be formed adjacent the anchoring elements 90. Forming the spikes 86 from the plastic component 38 can additionally have the advantage that the front end the front edge 30 is formed from a relatively soft material that can be additionally rounded or chamfered in order to smooth the edges. Consequently, contact of the user's skin with the front ends of the anterior edge 30 is not typically an experience that causes skin irritation or similar adverse effects. In addition, high temperature points on the tips 36 can be avoided, since the plastic component 38 is typically provided with a relatively low coefficient of thermal conductivity compared to the metal component 40.
[0132] As can be seen from the cross-sectional views of Figures 6, 7 and 8, the edges of the tips 86 of the teeth 36 at the front ends of the anterior edges 30 can be significantly rounded. As can be seen further, the transition between the metal component 40 and the plastic component 38 on the top surface 32 in the region of the teeth 36 can be substantially seamless or without steps. In this regard, additional reference is made to Figure 9. It may be advantageous to shape the anchoring elements 90 so that their upper side (side facing the skin) is displaced from the top surface 32. Consequently, also the side facing the The skin of the anchoring elements 90 can be covered by the plastic component (see also Figure 8). In one embodiment, the anchor elements 90 can be angled with respect to the top surface 32. The anchor elements 90 can be arranged at an angle α (alpha) with respect to the tooth shank portions 88. It may be additionally preferred that the anchor elements 90 are flexed backwards with respect to the top surface 32. At least in some embodiments, the anchor elements 90 can be thinner than the tooth shank portions 88. This configuration can further increase the space that can be filled by plastic component 38 during molding.
[0133] Still with reference to Figure 6, the stationary blade 22 will be described in detail. The stationary blade 22 can define and encompass a guide slot 96 of the movable cutting blade 24. For this purpose, the stationary blade 22 can comprise a first wall portion 100 and a second wall portion 102. For the purposes of this disclosure, the first wall portion 100 can be considered a skin-facing wall portion. This applies in particular when the blade set 20 is used for shaving or waxing. Consequently, the second wall portion 102 can be considered the wall portion facing the opposite side of the skin. In other words, the first wall portion 100 can also be considered a top wall portion. The second wall portion 102 can also be considered a bottom wall portion.
[0134] The first wall portion 100 and the second wall portion 102 can jointly define teeth 36 of the stationary blade. The teeth 36 may comprise a slit or gap in the movable cutting blade 24, particularly for the teeth 82 thereof, disposed on at least one notched front edge 80. As indicated above, at least a substantial portion of the first wall portion 100 may be formed by the metal component 40. At least a substantial portion of the second wall portion 102 can be formed by the plastic component 38. In the exemplary embodiment illustrated in Figure 6, the second wall portion 102 is formed completely by the plastic component 38. Instead, the first wall portion 100 is formed together by the plastic component 38 and the metal component 40. This applies in particular to the leading edge 30. The first wall portion 100 may comprise, in the respective tooth portions of the therein, connection portions 106, where the plastic component 38 is connected to the metal component 40. The connection portions 106 may involve the anchoring elements 90 of the c the metal component 40 and the plastic material of the plastic component 38 covering the anchoring elements 90.
[0135] Figures 6 and 8 illustrate a cross section through a tooth 36 (see also line VIIIVIII in Figure 4). In contrast, Figure 7 illustrates a cross section through a tooth gap (see line VII-VII in Figure 4). As can be seen in Figures 6 and 7, the first wall portion 100 and the second wall portion 102 can together form the front edge 30 which includes the teeth 36. The first wall portion 100 and the second wall portion 102 can together define a basically U-shaped lateral cross section of the respective teeth 36. The first wall portion 100 can define a first U-shaped leg 110. The second wall portion 102 can define a second U-shaped leg of U. The first leg 110 and the second leg 112 can be connected at the ends 86 of the teeth 36. Between the first leg 110 and the second leg 112, a slot can be provided or go to the movable cutting blade 24.
[0136] As can be seen further in Figure 6, the first portion of wall 100 can be significantly thinner than the second portion of wall 102 of stationary blade 22. Consequently, in the first portion of wall facing skin 100, the hairs they can be cut very close to the skin. It is therefore desirable to reduce the thickness of the first wall portion 100, particularly of the metal component 40. As an example, the thickness ltm (see Figure 7) of the metal component 40, particularly close to the tooth shank portions 88 , can be in the range of about 0.08 mm to 0.15 mm. Consequently, the first wall portion 100 can therefore have considerably small strength and stiffness. It is therefore beneficial to support or reinforce the first wall portion 100 by adding the second wall portion 102. Since the thickness of the second wall portion 102 basically does not affect the shortest cut length that can be obtained (for example, the length of hairs remaining close to the skin), the thickness of the second wall portion 102, particularly at the respective front edges 30, can be significantly greater than the thickness of the first wall portion 100, in particular of the metal component 40. This can give the stationary blade 22 sufficient strength and stability. As can be seen further in Figure 6, the first wall portion 100 and the second wall portion 102 can basically form a closed profile, at least sectionally along its lateral extension (see also Figures 10 and 11 in this regard). This can be applied particularly when the stationary blade 22 is provided with a first and a second front edge 30a, 30b. Consequently, the stiffness of the stationary blade 22, particularly the stiffness against flexural or torsional stresses can be further increased.
[0137] In one embodiment, the second wall portion 102 may comprise an inclined portion 116 adjacent the second leg 112 on the respective front edge 30. Assuming that the stationary blade 22 is basically shaped symmetrically with respect to a central plane defined by vertical direction Z and lateral direction Y, the second wall portion 102 may additionally comprise a central portion 118 adjacent the inclined portion 116. Consequently, the central portion 118 can be interposed between a first inclined portion 116 and a second inclined portion 116. The first inclined portion 116 can be positioned adjacent a respective second leg 112 on the first front edge 30a. The second inclined portion 116 can be positioned adjacent a respective second leg on the second anterior edge 30b. As can be best seen in Figure 6, the second wall portion 102 can then comprise a cross-section basically in the form of M, defined mainly by the inclined portions 116 and the central portion 118.
[0138] Still with reference to Figures 10 and 11, the shape and configuration of an exemplary embodiment of the plastic component 38 of the stationary blade 22 is described in more detail. As can be seen best in Figure 10, the inclined portions 116a, 116b can extend basically along the entire (lateral) length of the plastic component 38. The front edges 30a, 30b can generally extend between a first lateral protection element 42 and a second side protection element 42 which are disposed at opposite (laterally) ends of the plastic component 38. The recessed portion of the plastic component shown in Figure 8 which basically defines a lower side of the guide slot 96 is generally covered by the component of metal 40 (see Figure 2).
[0139] As can be best seen in Figure 11, the central portion 118 between the sloping portions 116a, 116b can generally extend over a substantial portion of the entire (lateral) length of the plastic component 38. However, along the portion center 118, at least one opening slot 120 can be provided. According to the exemplary embodiment shown in Figures 10 and 11, the central portion 118 can be arranged between a first opening slot 120a and a second opening slot 120b. The opening slits 120a, 120b can define at least one opening through which, in the assembled state, the transmission member 70 can come into contact with the movable cutting blade 24. As can be best seen in Figure 10, the plastic component 38 can further comprise at least one guide element 122, particularly a plurality of guide elements 122 that can be configured to guide the bridge connector 74 and, consequently, the movable cutter blade 24 connected thereto. In one embodiment, the plurality of guide elements 122 can be arranged in pairs, the respective pairs being arranged at ends of the central portion 118 laterally displaced. The guide elements 122 can be arranged basically as convex shaped profiles that extend vertically. The guide elements 122 can define a longitudinal position of the transmission member 70 and the movable cutting blade 24.
[0140] It is worth mentioning in this respect that the central portion 118, and particularly the at least one opening gap 120 of the transmission member 70, can be configured differently in alternative modalities. As an example, in one embodiment, the central portion 118 is interrupted by a single opening slot 120 through which contact between the bridge connector 74 and the movable cutting blade 24 can occur. Therefore, it should be emphasized that the bridge connector 74 of the transmission member 70 does not necessarily need to include two contact points for the movable cutting blade 24 that are considerably spaced apart in the lateral Y direction, as shown in Figure 3. Instead, the bridge connector 74 may also come in contact with the movable cutting blade 24 in the central (lateral) portion.
[0141] With specific reference to Figures 12, 13 and 14, the blade set 20 which includes the stationary blade 22 being assembled with the movable blade 24 is described in more detail. Figure 12 is a partial top view of the blade set 20, the hidden contours of the mobile cutter blade 24 being indicated by dashed lines. Figure 13 is a cross-sectional view of the arrangement shown in Figure 12, the section involving a tooth 36 on the stationary blade 22 and a tooth slot on the mobile cutting blade 24 (see line XIII-XIII in Figure 12). In contrast, the cross-sectional view shown in Figure 14 includes a section through a tooth slot in the stationary blade 22 and a tooth 82 in the mobile cutting blade 24 (see line XIV-XIV in Figure 12). The movable cutting blade 24 can be moved relative to the stationary blade 22 reciprocally (see double arrow indicated by reference number 126 in Figure 12). By means of the relative movement of the stationary blade 22 and the mobile cutting blade 24, the respective teeth 36 and 82 can act together to cut hairs that enter the respective tooth slots.
[0142] The transmission member 70 which is basically configured to transmit the driving movement to the movable cutting blade 24 can extend through the stationary blade 22, particularly through the at least one opening slot 120 associated with the central portion 118 of the blade stationary 22 (see Figure 11). Figure 14 additionally shows a pair of guide elements 122 that can guide the transmission member 70 and, consequently, the movable cutting blade 24. The guide elements 122 can define the longitudinal position of the transmission member 70 and the movable cutting blade 24 on the stationary blade 22.
[0143] It is particularly preferred that, at least in some embodiments, the movable cutting blade 24 is arranged in the guide slot 96 in a defined manner. It may be additionally preferable that no other mounting member, particularly on the flexing member, is necessary to hold the movable cutting blade 24 in its desired position and in close contact with the first wall portion 100. This is possible because the stationary blade 22 is provided with a first wall portion 100 and a second wall portion 102 opposite the first wall portion 100. Both wall portions 100, 102 can define a precise coupling slot for the movable cutting blade 24, particularly for the teeth 82 of the same, so that the vertical position (Z position) of the movable cutter blade 24 can be defined with narrow tolerances. This can significantly reduce the manufacturing and assembly costs of the blade set 20.
[0144] As an example, the stationary blade 22 and the mobile cutting blade 24 can be configured so that the mobile cutting blade 24 contacts at least sectionally with the first wall portion 100 substantially flat. This can apply particularly to the respective tooth portions. It is worth mentioning in this regard that such a configuration does not in practice require perfect surface contact during the operation of the blade set 20. In contrast, it can be assumed that the stationary blade 22 and / or the mobile cutting blade 24 can be flexed or preloaded, at least when in operation, so that only small contact areas remain. However, the first wall portion 100 can serve at least as a defined limit stop for the movable cutting blade 24 in the Z (vertical) direction. The second wall portion 102 may comprise a projecting contact surface 130 which is associated with a respective toothed front edge 30. The projecting contact surface 130 can be arranged in a transition between the second leg 112 and the inclined portion 116 of the second portion 102 (see Figure 14). The protruding contact surface 130 can define a gap or resulting height dimension in the guide slot 96 for the movable cutting blade 24. The resulting gap lcl (see Figure 7) can be defined so that a defined gap is provided for the blade mobile cutter 24 to be assembled. Consequently, the movable cutting blade 24 can be arranged on the stationary blade 22 without significant preload, at least in a deactivated state. However, in yet another embodiment, the span or height dimension for the cutter blade to be mounted 24 in the slot 96 can be defined so that basically a press fit is provided. Consequently, the mobile cutting blade 24 can be at least slightly preloaded by the stationary blade 22. The height dimension or the thickness dimension lt (see Figure 14) of the mobile cutting blade 24, at least on at least one toothed front edge. 80 of the same, can be in the range of 0.1 mm to 0.18 mm.
[0145] Figure 15 shows a side view of a stationary blade 22. In this regard, additional reference is made to Figure 6 illustrating a respective side view in cross section. As can be best seen in Figure 6, the plastic component 38 of the stationary blade 22 can basically form an open profile. A closed profile around the guide slot 96 for the movable cutting blade 24 can be formed together by the plastic component 38 and the metal component 40 (see also Figure 6). However, in relation to the side protection elements 42 illustrated in Figures 10 and 11, for example, it is worth mentioning that the plastic component 38 can actually form a partially closed profile (see also Figure 15). However, particularly at the cutting edges 30a, 30b of the stationary blade 22, the plastic member 38 can be considered an open profile. As previously indicated, it is particularly preferred that the stationary blade 22 is configured to receive the movable cutting blade 24 in a defined manner without the need for additional bending elements. It is therefore preferred that the guide slot 96 provides a defined gap dimension 1cl so that the movable cutting blade 24 (see Figure 17) comprising a dimension of defined thickness lt can be mounted in the slot in a defined manner.
[0146] The cutting action of the hair cutting device 10 is basically attributable to the relative movement of the mobile cutting blade 24 in relation to the stationary blade 22, particularly to a reciprocating lateral movement (see arrow 126 in Figure 12). A relative movement, particularly a relative sliding movement between the movable cutting blade 24 and the stationary blade 22, can basically involve friction and, therefore, generate heat. It is, therefore, preferable that the movable cutting blade 24 is received in the guide slot 96 without the application of significant preload forces, particularly without significant preload in the vertical direction (Z direction). On the other hand, it may be preferable that the mobile cutter blade 24 is received in the guide slot 96 basically without any play or, at least almost without any play, which may involve an assembly of the mobile cutter blade 24 with very little play in the vertical direction Z. Thus, defining a resulting clearance dimension lcl in the guide slot 96 can be considered a choice between reducing preload forces (vertical) - which can be responsible for excess heat generation and energy consumption - and minimizing a resulting clearance (particularly a vertical clearance) of the movable cutting blade 24 in the guide slot 96 - which could decrease the cutting performance and additionally involve compromised hair cutting when a minimum span (particularly a minimum vertical span) between the movable cutting blade 24 and the stationary blade 22 at the cutting edges of the same it became very large.
[0147] As it is preferable, at least in some modalities, to form or arrange the stationary blade 22 as a metal-plastic composite component, the manufacturing particularities have to be considered. Particularly in relation to the plastic component 38, it is necessary to consider the effects that can arise with the molding process. Molded parts, particularly injection molded parts, are typically subject to shrinkage, warping and, to some extent, water absorption, which can adversely affect the performance of the plastic component 38.
[0148] However, when defining the shape and geometry of the plastic component 38 and a respective mold, shrinkage and warping can be taken into account and therefore conform the mold to the plastic component 38 to be shaped so that the resulting plastic component 38 has the desired shape. In other words, warpage and shrinkage can be estimated, which may involve forming the mold with a “wrong” geometry, with the molded plastic component 38, particularly after cooling, distorting or shrinking and therefore deforms until it takes on the desired final shape. It is worth mentioning in this regard that distortion and shrinkage can be influenced. This may involve changing the cooling process, for example, by varying the cooling time. An additional measure to affect distortion and warping may involve placing a cooling meter in the guide slot 96 to define its shape when the plastic component 38 is cooling. Such a cooling meter can be considered a “dummy” component for the guide slot 96. In general, it may be preferable for the guide slot 96 to be defined by a substitute component that is placed in the mold of the stationary blades 22 together with the component metal 40. The remaining time of the stationary metal-plastic composite blade 22 in the mold and also the remaining time of the replacement component in the guide slot 96 can affect the final shape of the plastic component 38.
[0149] When forming the integrated metal-plastic composite stationary blade 22, it may also be necessary to take into account the fact that the plastic component 38 and the metal component 40 are connected to each other on the respective front edge 30, particularly on two opposite edges arranged in opposition 30a, 30b. Consequently, the fact that two different materials (metallic materials and plastic materials) are basically combined. In general, metallic materials, for example, steel, can be considered considerably rigid in relation to plastic materials. In other words, the metal component 40 basically defines a location of the plastic component 38 in the connecting portions 106 where the anchoring elements 90 and the plastic material are connected together (see also Figures 4 and 5).
[0150] The plastic component 38 and the molding process can be configured so that, in the finished state of the stationary blade 22, the metal component 40 is basically flat. Such an embodiment is illustrated in Figure 15. Consequently, the mobile cutting blade 24 (see Figure 17) can basically come into contact with metal component 40 with at least a substantial portion of its side facing the skin. On its side facing the opposite side of the skin, the movable cutting blade 24 can be guided by the protruding contact surfaces 130 which define the clearance dimension lcl of the guide slot 96. The protruding contact surfaces 130 can comprise respective contact elements 158. The rear side (or bottom side) of the metal component 40 and the contact element 158 can define the respective gap in the guide slot 96 for the movable cutting blade. It is particularly preferable, at least in some embodiments, to form the plastic component 38 so that the resulting gap dimension lcl is slightly greater than the thickness dimension lt of the movable cutter blade 24. However, at least in some alternative embodiments, the clearance dimension lcl of the guide slot 96 may be slightly less than the thickness lt of the movable cutter blade, thus providing a snap fit of the movable cutter blade 24 to the stationary blade 22.
[0151] In yet another exemplary embodiment, the stationary blade 22 can be deformed after being molded in a defined manner so as to obtain a beneficial assembly and contact configuration for the mobile blade 24. Such a mode is explained in detail and described with with respect to Figures 16 and 17. Plastic material basically shrinks during cooling after molding. In addition, relatively thin wall sections typically solidify more quickly than thicker wall sections. The greater the thickness, the greater the thermal energy a section of wall can understand, and which needs to be dissipated during cooling. As previously mentioned, a cooling process can also be, at least to some extent, controlled in order to obtain a desired final shape of the stationary blade 22. Cooling management may additionally involve the selective operation and control of a flow of cooling fluid in respective flow channels in the stationary blade mold 22.
[0152] As shown in Figure 16 in an exaggerated manner, one can profit from the distortion related to the shrinking of the plastic component 38. Since the metal component 40 is a relatively rigid part, there will basically be no significant shrinkage in the first portion of wall 100 (see Figure 6) which is basically formed by metal component 40. However, in the second portion of wall 102 which is formed at least substantially by plastic component 38, significant shrinkage and, consequently, distortion can occur. In other words, the second leg 112, the inclined portion 116 and the central portion 118 can be subjected to a cooling related shrinkage. Consequently, the stationary blade 22 as a whole can be slightly deformed, as indicated in Figure 16 by the curved arrows denoted by reference number 150. In other words, due to significant shrinkage in the second wall portion 102, the cutting edges 30a , 30b of stationary blade 22 can be flexed back to a certain extent. This configuration can have several beneficial effects.
[0153] Given the total dominant deformation of the stationary blade 22 shown in Figure 16, the contact elements 158 on the projecting contact surfaces 130 can basically be moved inwardly relative to a rear surface or bottom surface of the movable cutting blade 24. This can define a precise contact point or, more specifically, a defined contact line where the mobile cutting blade 24 is slightly preloaded (see respective block-type arrows indicated by reference number 152 in Figure 17). Consequently, the contact elements 158 can slightly force the movable cutting blade 24 in the vertical direction (Z direction). On the other hand, given the curved shape of the metal component 40, the respective opposite contact force exerted on the top surface or on the front surface of the mobile cutting blade 24 can be applied to the mobile cutting blade 24 in offset longitudinal positions (see respective arrows block type indicated by reference number 154 in Figure 17). For illustrative purposes only, block-like arrows 154 in Figure 17 have their tips truncated. This may indicate that the counter-preload force applied from the metal component 40 to the movable cutting blade 24 is basically applied to it territorially (i.e., in a distributed manner). Although at least slightly flexed or deformed due to the distortion associated with the shrinkage of the plastic component 38, the metal component 40 can still be considered a relatively flat component. It is particularly preferred that the tooth shank portions 88 (see Figure 5) of the metal component 40 and the teeth 82 of the movable cutting blade 24 are basically aligned and extensively in contact. This can minimize wear, particularly at the respective cutting edges 84, 94 of the teeth 82 and the tooth shank portions 88. In addition, the cutting performance can be increased in this way.
[0154] Given the preload applied to the movable blade 24 on the top and bottom side, also the movable cutting blade 24 can be slightly deformed according to the main curved deformation of the stationary blade 22. It is, therefore, particularly it is beneficial that a contact point where the contact force is applied to the bottom surface of the mobile cutting blade 24 (reference number 152 in Figure 17) is moved inward from a respective contact point where the preload is applied to the top surface of the movable cutter blade 24 (reference number 154 in Figure 17).
[0155] Still with reference to Figures 18a, 18b and 18c, exemplary modalities of the protruding contact portion 130 and contact element 158 will be illustrated and described in detail below. As already shown in Figures 15 and 16, the projecting contact portion 130 can be provided in a transition between the second leg 112 and the inclined portion 116 of the second wall portion 102. In Figures 15 and 16, the contact element 158 is basically disposed as an edge or intersection of the second leg 112 and the angled portion 116 which faces inward or projects in the direction of the metal component 40 as the first wall portion 100.
[0156] As shown in Figures 18a, 18b and 18c, the protruding contact portion 130 may alternatively be formed as a raised element in the second wall portion 102. As shown in Figure 18a, the protruding contact portion 130 may have a substantially rectangular shape, for example. In general, the projecting contact portion 130 may comprise a separate contact element 158 shaped as a contact surface. The contact element 158 illustrated in Figure 18a can be arranged substantially parallel to a bottom surface of the metal component 40 of the first wall portion 100. Basically, it is possible to obtain extensive surface contact between the flat contact element 158 and the blade mobile cutter 24.
[0157] Figures 18b and 18c show that the projecting contact portion 130 can generally comprise a curved contact element 158. The respective cross-sectional views of Figures 18b and 18c further show that the contact elements 158 can basically comprise a semicircular or rounded contact surface. Although the protruding contact portion 130 of Figure 18b is generally formed as a circular segment, the protruding contact portion 130 of Figure 18c can instead be shaped like a wedge including a rounded tip on which the contact element is arranged. 158 for contact with the movable cutting blade 24. With respect to the modalities of the protruding contact portions 130 illustrated in Figures 15 and 18a to 18c, it should also be noted that their precise appearance and shape can be modified within relatively wide ranges. In particular, the shape of the contact element 158 can be modified to influence the size of a resulting contact surface between the second wall portion 102 of the stationary blade 22 and the movable cutting blade 24. In addition, a longitudinal position (position X) of the contact elements 158 in relation to the movable cutting blade 24 can be modified. However, at least in some embodiments, it is preferred that the point of contact between the second portion of wall 102 and the movable cutting blade 24 is moved inward from a respective point of contact of the first portion of wall 102 and the cutting blade mobile 24 (see also Figure 17). Therefore, also the movable cutting blade 24 can be preloaded or pre-flexed in the guide slot 96 and, consequently, exhibit a slightly convex general shape.
[0158] It may be additionally beneficial that a basically preloaded assembly, which includes the stationary blade 22 and the movable cutting blade 24, can act as a bending member at least slightly tensioned. Since the assembly structure of the resulting blade assembly 20 is, at least partially, at least slightly flexible, defined mounting conditions for the movable cutting blade 24 and defined operating conditions for the blade assembly can be provided. However, it should be mentioned in this regard that the preloaded stationary blade of Figure 16 and the preloaded mobile cutter blade of Figure 20 can also be combined, although they are deformed in opposite ways.
[0159] With specific reference to Figures 19, 20 and 21, an alternative approach of implementing an assembly with defined clearance of the movable cutter blade 24 in the guide slot 96 of the stationary blade 22 is illustrated and described in detail. Figure 19 illustrates a side view of the movable cutting blade 24 which comprises a basically flat shape. Figure 20 illustrates a side view of a slightly pre-flexed or preloaded movable cutting blade 24. Figure 21 illustrates another side view of a blade set 20 that includes a stationary blade 22 and a preloaded movable cutter blade 24 that is inserted into a respective guide slot 96 of stationary blade 22. Referring to the arrangement shown in 21, the movable cutting blade 24 may comprise a basically concave or forward flexed shape with respect to the top surface 32 of the metal component 40. Basically, this may require that the movable cutting blade 24 be received at its bottom surface at the central portion 118 of the second wall portion 102. In this way, a respective contact portion 130 can also be provided in the central portion 118. Consequently, a preload force (block-type arrow indicated by reference number 164 in Figure 20) it can be applied to the movable cutting blade 24 in a central longitudinal portion thereof.
[0160] In contrast, on its upper side, the mobile cutting blade 24 can come in contact with the metal component 40 in the region of its anterior cutting edges 80. Consequently, given the concave shape of the mobile cutting blade 24 shown in Figure 20 , a respective contact force or preload force can be applied to the movable cutting blade 24 at two relatively distant contact points (see respective block-type arrows indicated by reference number 166). In addition, in this way, a defined preloaded mounting condition of the movable cutter blade 24 can be obtained. Again, it may be preferable that at least the teeth 82 of the movable cutter blade 24 and the tooth shank portions 88 of the component of metal 40 are placed in alignment and basically in extensive surface contact when the movable cutting blade 24 is mounted in the guide slot 96.
[0161] With specific reference to Figures 22 to 25, exemplary modalities of the teeth 82 of the mobile cutting blade 24 are illustrated and explained in detail. Figures 23 and 24 show the respective frontal views in partial cross section of a set of blades 20, being that the teeth 36 of the stationary blade 22 and the teeth 82 of the mobile cutting blade 24 are cut (see also line XXIII-XXIII in Figure 22). The respective teeth 36 of the stationary blade 22 are formed sectionally by the plastic component 36, in the second wall portion 102, and the metal component 40, in the first wall portion 100. The mobile cutting blade 24 is received in a mobile and guided manner in a gap between the first wall portion 100 and the second wall portion 102. The relative reciprocating movement between the stationary blade 22 and the mobile cutting blade 24 is indicated by the double arrow designated by reference number 126 in Figure 23. As you can see further seen in Figure 23, teeth 36 and teeth 82 can be provided with respective cutting edges 84, 94 which are configured to act together to cut hairs that enter the gaps between teeth 36 of stationary blade 22. stationary blade, the cutting edges 94 can be provided in the respective tooth shank portions 88. Consequently, the cutting edges 94 of the stationary blade 22 are provided in the metal component 40 which forms at least a substantial part of the first wall portion 100. In the embodiment illustrated in Figure 23, the movable cutting blade 24 correspondingly comprises cutting edges 84 on its upper side facing the first wall portion 100. Consequently , the cutting edges 84, 94 can come into contact and act together. As can be seen further in Figure 23, the teeth 82 of the movable cutting blade 24 can comprise a basically trapezoidal shape. In particular, the cutting edges 84 are provided at acute angles of the trapezoidal profile of the teeth 82. On the underside of the movable cutting blade 24, the trapezoidal profile can basically comprise obtuse angles.
[0162] The configuration illustrated as an example in Figure 23 is particularly beneficial for cutting hair very close to the skin. As the second wall portion 102 of the stationary blade 22 basically reinforces or stiffens the stationary blade 22, the thickness of the first wall portion 100 can be significantly reduced resulting in a smoother shaving or shaving performance. As it is particularly preferred that the movable cutting blade 24 is kept, at least on its teeth 82, in close contact with the metal component 40, particularly its tooth shank portions 88, a small gap of remaining gap 172 can be provided in the underside of teeth 82 between the second portion of wall 102 and the movable cutting blade 24. In some cases, hair, particularly cut hair, can enter the gap 172. This can adversely affect the friction between the movable cutting blade 24 and the blade stationary 22. Hair can get caught in the gap 172 causing accumulation of debris in the gap. Therefore, the blade set 20 may be compromised. In addition, assuming that there is a considerable amount of hair trapped in the gap gap 172, the energy consumption of the hair trimmer 10 may increase or, vice versa, the output power may decrease. Consequently, the shaving or epilation performance and the durability of the hair clipper can be reduced.
[0163] Figure 24 illustrates an alternative mode of the blade set 20 in which particularly the movable blade 24 is modified in relation to the mode shown in Figure 23. As can be seen from the front view in cross section in Figure 24 and the front view in Figure 25, the mobile cutting blade 24 according to this modality is provided with first cutting edges 84 on the side facing the skin that comes in contact with the first portion of wall 100. In addition, the mobile cutting blade 24 comprises rear cutting edges 176 on the underside of the same facing the second wall portion 102. Consequently, the teeth 82 of the movable cutting blade 24 can comprise a cross section basically in the shape of an X. In other words, the teeth 82 of the blade movable cutter 24 may comprise side flanks 178 which comprise a basically concave or notched shape. It is particularly preferable that the teeth 82 of the movable blade comprise a substantially polygonal shape in which, on the upper side of it, two acute upper angles and, on the lower side of it, two other acute upper angles define, respectively, the cutting edges (upper ) 84 and the cutting edges (rear) 176. As an example, the movable cutting blade 24 according to the modality shown in Figures 24 and 25 can be formed by a chemical attack process. Chemical attack processes or similar material removal processes can form relatively complex shapes in metallic materials. Conforming the shape of the mobile cutting blade 24 by means of a chemical attack process is particularly preferred, since in this way a single process can be used to produce a shape with the definitive shape of the mobile cutting blade 24.
[0164] Figure 26 illustrates another exemplary embodiment of a stationary blade 22 according to some aspects of the present disclosure. Figure 27 illustrates a set of blades 20 that implements another exemplary modality of a stationary blade 22. Both Figures 26 and 27 are seen in partial cross section illustrating basically a half view of the stationary blades 22 (see also Figures 6 and 14 thereto). respect). Figure 26 shows a cross section through a tooth 36 of the stationary blade 22. Figure 27 shows a cross section through a tooth 36 of the stationary blade 22 and through a tooth 82 of the mobile cutting blade 24.
[0165] As can be seen in Figures 26 and 27, the stationary blade 22, particularly the plastic component 38 thereof, may comprise a span portion 170 in the guide slot 96. Particularly, the span portion 170 may be arranged as a lowered span portion 170 which is lowered in relation to a standard shape 168 of an exemplary guide slot (see dashed lines in Figures 26 and 27 indicated by reference number 168, and Figure 7, for example).
[0166] The span portion 170 can provide a height offset from the movable cutting blade 24 (see Figure 27) or, similarly, from the protruding contact portion 130 involving a vertical span span (rear) lvg in the range from about 50 to about 250 μm (micrometers), for example. Most preferably, the vertical span span lvg can be in the range of about 100 to 200 μm, and even more preferably, in the range of about 120 to 180 μm. Alternatively or additionally, with reference to Figure 27, the span 170 may provide a longitudinal displacement from the movable cutting blade 24 or, similarly, from the protruding contact portion 130 involving a longitudinal or frontal span extension lfg in the range of about 50 to about 250 μm (micrometers), for example. More preferably, the front span span lfg can be in the range of about 100 to 200 μm, more preferably in the range of about 120 to 180 μm. The span portion may further comprise a total longitudinal span span llg in the range of about 0.5 to about 1.5 mm (millimeters), more preferably in the range of about 0.7 to about 1.1 mm. The total longitudinal span span 11g can extend from the projecting contact portion 130, particularly from a contact element 158 thereof, to a front longitudinal end of the guide slot 96 adjacent to the tips 86 of the teeth 36.
[0167] In general, the guide slot 96 may comprise a total longitudinal extension lsl in the range of about 7.0 mm to about 11.0 mm, more preferably in the range of about 8.0 mm to about 10.0 mm. In general, a ratio between the total longitudinal span llg (at a serrated cutting edge 30) and the total longitudinal span lsl can be in the range of about 1: 6 to about 1:12, most preferably in the range of about 1: 8 to about 1:11. As previously indicated, the guide slot 96 can provide a height dimension with vertical clearance lcl that is adapted to the vertical thickness dimension lt of the movable cutter blade 24. The vertical clearance height dimension lcl and the vertical thickness dimension lt they can be in the range of about 0.1 mm to about 0.2 mm, preferably in the range of about 0.12 mm to about 0.17 mm.
[0168] The span portion 170 can define a lower span or rear span 180 on a lower side of the guide slot 96. The span portion 170 can additionally define a front span or end span 182 at a front end of the span gap. guide 96. Rear span 180 and end span 182 can mesh. The span portion 170 may comprise an adjacent flank 184 and a curved transition 186 adjacent to adjacent flank 184. Adjacent flank 184 and curved transition 186 may mesh. Adjacent flank 184 and curved transition 186 can be concave shaped. Adjacent flank 184 and curved transition 186 can together form an internal indentation in guide slot 96. Adjacent flank 184 and curved transition 186 can be arranged substantially on a second wall portion 102, particularly on the second leg 112 thereof. Adjacent flank 184 and curved transition 186 can be formed from plastic component 38.
[0169] As can be better seen in Figure 27, a bowl 192 can be provided in the second portion of wall 102, particularly in the second leg 112 thereof. Bowl 192 can be arranged as a protrusion on a lower side of the second wall portion 102 which is generally facing the opposite side of the skin when the blade assembly 20 is in operation. The bowl 192 can reinforce the second wall portion 102 in the vicinity of the span portion 170. In general, the bowl 172 may comprise an outer surface that can substantially correspond to an inner surface of the span portion 170. The bowl 172 may have a concave shape. Due to the bowl 172, the second wall portion 102, particularly the second leg 112 thereof, can maintain its overall wall thickness.
[0170] An additional beneficial aspect of the present disclosure will be described in detail and elucidated below with reference to Figures 28 to 38. According to this alternative aspect, different cutting regions that are suitable for at least slightly different purposes are implemented in the set of blades. In Figures 28 to 38, the respective sets of blades are designated by the reference number 200. As previously explained, the set of blades 200 can also be considered as a set of metal-plastic composite blades. However, it should be explicitly mentioned in this regard that the set of blades 200 which implements a plurality of differently shaped cutting sections can also be formed according to alternative manufacturing principles. As shown in Figures 28 and 29, the blade set 200 comprises a stationary blade 22 and a movable cutting blade 24. Preferably, the blade set 200 consists of stationary blade 22 and movable cutting blade 24. This can, of course, involve the condition that a transmission member is provided which is coupled to the movable cutting blade 24 (in this regard, see Figure 3, for example). However, it is preferred that, regardless of that, the blade set 200 does not necessarily comprise additional components.
[0171] As in the form of the blade set 20 shown in Figure 3, the stationary blade 22 of the blade set 200 shown in Figures 28 and 29 also comprises a plastic component 38 and a metal component 40 which are connected to each other other. Therefore, the plastic component 38 can be formed and molded into the metal component 40 in an injection molding process. Consequently, the blade set 22 can be considered a molded blade set with inserts 22, a molded blade set with overlap 22 etc. Additionally, as previously explained, as the stationary blade 22 can be considered as a metal-plastic composite stationary blade 22, particularly as a fully molded or shaped stationary blade 22, in practice, the plastic component 38 is not present in isolation in these modalities.
[0172] As previously shown, the stationary blade 22 comprises a first wall portion 100 and a second wall portion 102 (see also Figure 30). The first wall portion 100, at least the substantial portion thereof, is formed by the metal component 40. As in the embodiment of Figures 28 to 30, the second wall portion 102 is formed by the plastic component 38 which also forms at the same time. minus a minor part or a fraction of the first wall portion 100. The first wall portion 100 and the second wall portion 102 together define a guide slot 96 in which the movable cutting blade 24 can be received in a sliding manner. In addition, at the side end of the blade assembly 22, a side opening 68 can be provided through which the movable cutting blade 24 can be inserted. In the assembled state of the mobile cutting blade 24, a respective transmission member 70 can be attached to it and locking or securing the mobile cutting blade 24 to the stationary blade 22 of the blade assembly 200 (see also Figure 3).
[0173] In the assembled state, a shaving or waxing region with metal foil 202 is provided in the set of blades 200 (see Figure 31). The shaving or waxing region with foil 202 is arranged and positioned adjacent to at least one toothed anterior edge 30a, 30b. Preferably, as with the set of two-sided blades 200 of Figure 31 which implements a first toothed front edge 30a and a second toothed front edge 30b which is displaced from the first front edge 30a, the shaving or shaving region with foil metal 202 is disposed between the first toothed front edge 30a and the second toothed front edge 30b. However, the two considerably distinct types of cutting zones or cutting regions 30a, 30b and 202 are basically defined by the same components as the blade set 200.
[0174] As an example, the metal component 40 from which the first wall portion 100 is formed at least substantially, can be provided with respective tooth shank portions 88 which, in the molded or overlapped molded state, form the teeth 36 of the stationary blade 22 acting together with the plastic component 38. For this purpose, anchoring elements 90 can be provided at the longitudinal ends of the tooth shank portions 88 to which the molded material and the liquefied plastic material can be attached. connected in the course of injection molding or forming the plastic component 38. In addition, a perforated section 204 can be provided in the metal component 40 which can therefore also be present in the first wall portion 100. The perforated section 204 is arranged between respective series extending laterally from tooth shank portions 88 extending longitudinally. The perforated section 204 comprises a series or pattern of perforations 206, particularly of circular cutouts. On the side facing the opposite side of the skin, when in operation, which is also called the underside, the perforations 206 can be provided, at least partially, with cutting edges 216.
[0175] The perforation arrangement or pattern 206 of perforated section 204 may comprise an arrangement that includes a defined number of rows and a defined number of columns of respective perforations 206. However, other types or forms of perforation patterns may also be provided. , for example, a pattern of alternating perforations 206.
[0176] On the movable cutting blade 24, a corresponding perforated section 206 may be provided which comprises a plurality of perforations 210. The perforated section 206 is arranged and positioned between a first toothed front edge 80a and a second toothed front edge 80b of the cutting blade movable 24. Each of the first and second toothed front edges 80a, 80b extends in the lateral Y direction and is provided with teeth 82 extending basically in the longitudinal direction and which are provided with respective cutting edges 84. As can be seen best seen in Figures 28 and 29, the illustrated perforation section 208 comprises a pattern of alternating hexagonal perforations 210. In other words, perforations 210 can be arranged in a honeycomb pattern. Thus, the adjacent rows and columns of the perforated section pattern 208, as shown in Figures 28 and 29, can be displaced or incremented, with a displaced dimension between adjacent rows and columns can be approximately half the distance adjacent perforations 210 within that particular row or column. Obviously, other types and formats of the respective standards can be contemplated.
[0177] The respective cutting edges of the perforations 210 which are arranged as perforations in the shape of a honeycomb and which form the perforated section 208 as shown in the exploded top view perspective of Figure 28, are indicated by reference number 218. The edges Corresponding cuts that are formed in the perforations 206 of the metal component 40 on the side facing the opposite side of the skin (bottom side) are indicated in Figure 29 by the reference number 216.
[0178] Alternative modalities of movable cutting blades 24 which also implement perforated sections 208 to define a shaving or epilation region with metal foil 202 are shown in Figures 32 and 33. For example, the perforated section 208 of the mobile cutting blade 24 of Figure 32 includes a series of perforations 212 which basically extend in the longitudinal direction. Preferably, the perforations 212 are provided with respective cutting edges 218 on the upper side (side facing the skin) of them, at least along their longitudinal extension X. Figure 33 shows an alternative arrangement of perforations 214 that can form the perforated section 208. The respective movable cutter blade 24 includes a pattern of inclined perforations 214 which are arranged as slits that have a main extension that is at least slightly inclined in relation to the longitudinal direction X. As in the embodiment of Figure 32, the perforations slit-shaped 214 of Figure 33 may also comprise respective cutting edges 218 on the upper side thereof facing the skin.
[0179] The relatively short, hard hairs that enter the perforations 206 of the first side 100 which is defined at least substantially by the metal component 40 can be cut in a shearing operation by means of the relative movement of the mobile cutting blade 24 and the stationary blade 22. Therefore, not only at the respective cutting edges 30a, 30b, but also in the region of shaving or waxing with metal foil 202, the hair can be cut very closely or even at the skin level (see also Figure 30). As can be seen in Figures 28 to 33, the metal component 40 and the movable cutting blade 24 are at least slightly curved along their length in the longitudinal direction X. To further improve the cutting performance of the blade set 200, it is desirable to place the movable cutting blade 24 and the stationary blade 22 in close surface contact in the assembled state.
[0180] Assuming that the movable cutting blade 24, particularly the side of it facing the skin, and the first portion of wall 100, particularly the side of it facing the opposite side of the skin, can be at least slightly flexed against each other and therefore come into territorial contact, both the region of shaving or waxing with metal foil 202 in the central portion and the respective peripheral cutting regions that are arranged at opposite longitudinal ends of the set of blades 22 can contribute to the action cutting. As an example, the cutting region, which is mainly defined by the teeth of the mobile cutting blade 24, and the corresponding teeth of the stationary blade 22, which are present in the respective cutting edges 30a, 30b, can be considered as a region of trimming or shear cut. The shaving or waxing region with foil 202 may be provided adjacent to or, more explicitly, between the cutting anterior edges 30a, 30b.
[0181] With specific reference to Figures 34 to 38, refinements and beneficial modalities of components of the blade set 200 will be explained and described in detail. Mainly for purposes of illustration, Figure 34 shows a simplified schematic side view of a movable cutting blade 24 and a first portion of wall 100, particularly a metal component 40, of a stationary blade 22, each of which basically extending relatively flat and flat. In other words, the respective cutting surfaces 220 and 222 in the first portion of wall 100 and in the movable cutting blade 24, which can, respectively, be perforated according to the modality of Figures 28 to 31, can act together with each other to cut hair between them. However, due to basically unavoidable tolerances, inaccuracies, etc., it may be advantageous, in at least some modalities, to define and form the mobile cutting blade 24 and the metal component 40 of the stationary blade in a defined and forced curved manner. them in contact with each other in the final assembled state in order to obtain the desired surface contact on the respective contact surfaces 220, 222.
[0182] With regard to this approach, exemplary modalities are shown in Figures 35 to 38. Figures 35 and 37 illustrate simplified schematic side views of movable cutting blades 24 and metal components 40 of a first wall portion 100 of the blade stationary 22. In both Figures 35 and 37, the movable cutting blade 24 and the metal component 40 can be formed from pre-flexed laminar material. In addition, the respective movable cutting blade 24 and the respective metal components 40 can comprise a section or contour basically curved in a convex manner. A respective curvature of a curved surface 230 on the movable cutting blade 24 and a curvature of a corresponding curved surface 232 of metal component 40 can be at least slightly different from one another in an initial state. The curved surface 230 corresponds to the contact surface 220. The curved surface 232 corresponds to the contact surface 222 (see also Figure 34).
[0183] As can be seen in Figure 35, a radius of curvature of the curved surface 230 is less than a radius of curvature of the curved surface 232. In contrast, as can be seen in Figure 37, the radius of curvature of the curved surface 230 is greater than the radius of curvature of the curved surface 232. This configuration can have the advantage that, through the defined load force applied to the movable cutting blade 24 and the metal component 40, they can be flexed and forced into contact surface in the final assembled state as shown in the respective side views in cross section of Figures 36 and 38. Figure 36 illustrates an assembled state of a modality of the blade set 200 that implements a movable cutting blade 24 and, in the stationary blade 22 of the itself, a metal component 40, as shown in Figure 35. Figure 38 illustrates a side view in cross section of an embodiment of a set of blades 200 that implements a blade c mobile speaker 24 and, on stationary blade 22, a metal component 40, as shown in Figure 37.
[0184] As already indicated, the plastic component 38 of the stationary blade 22 can be provided with at least one projecting contact surface 130 which can force the movable cutting blade 24 into territorial contact with the first wall portion 100. As already noted discussed earlier, a distortion related to the shrinking of the plastic component 38 can also be used in order to force or pull the metal component 40 that forms at least the substantial portion of the first wall portion 100 in contact with the movable cutting blade 24. To avoid repetition, reference is made to Figures 13 to 21 and the corresponding description section in this context. Consequently, the shape and manufacturing process of the plastic component 38 can be arranged so that, in the assembled state, opposing contact forces 152, 154 can be applied to the metal component and the movable cutting blade 24 (see Figure 35) . Preferably, the respective pairs of contact force 152, 54 are displaced from each other in the longitudinal direction to ensure that the differently curved plastic component 40 and the movable cutting blade 24 can be forced into surface contact narrow.
[0185] The modality illustrated in Figures 35 and 36 is suitable for a configuration of the movable cutting blade 24 and the metal component 40 in which, in an initial state, a gap is provided adjacent to the longitudinal ends thereof. By forcing the movable blade 24 and the metal component 40 in contact with each other at the longitudinal ends, the gap can be closed.
[0186] In contrast, as with the modality of Figures 37 and 38, in an initial state, a central gap may be present due to the different curvature of the movable cutting blade 24 and the metal component 40. Consequently, through the application of a central contact force 164, the central gap can be closed so that the movable cutting blade 24 and the metal component can be forced into a surface contact. On the skin-facing or upper side 32, an opposite contact force 166 can be applied to the metal component 40 which can be transferred through the ends 86 where the first wall portion 100 and the second wall portion 102 are connected . Consequently, two arrows 166, as shown in Figure 37, adjacent to the longitudinal ends of the metal component 40 illustrate the resulting counter force. The contact force 164 and the opposite contact force (s) 166 can force the movable cutting blade 24 and the metal component 40 against each other in order to "close" the central gap between them and place the respective curved surfaces 230, 232 in territorial contact.
[0187] Although the invention has been illustrated and described in detail in the drawings and in the aforementioned description, such illustration and description should be considered illustrative or exemplary, and not restrictive; the invention is not limited to the disclosed modalities. Other variations to the disclosed modalities can be understood and carried out by those skilled in the art in the practice of the claimed invention according to the appended claims.
[0188] In the claims, the expression “that comprises” does not exclude other elements or other stages, and the indefinite article “one” or “one” does not exclude a plurality. A single element or another unit can perform the functions of several items mentioned in the claims.
[0189] No reference sign in the claims should be construed as limiting the scope of the invention.

权利要求:
Claims (24)
[0001]
1. STATIONARY BLADE (22), for a set of blades (20) of a hair cutting device (10), said set of blades (20) being arranged to be moved through hair in a direction of movement to cut hair, said stationary blade (22) comprising: - a first portion of wall (100) arranged to serve as a wall facing the skin when in operation, - a second portion of wall (102) at least partially displaced from the first portion wall (100), so that the first wall portion (100) and the second wall portion (102) define between them a guide slot (96) arranged to receive a movable cutting blade (24), at least one notched front edge (30) comprising a plurality of teeth (36) formed together by the first wall portion (100) and the second wall portion (102), characterized by the stationary blade (22) being a metal-plastic composite stationary blade fully formed (22), in which the first the wall portion (100) is made, at least partially, of a metallic material, the second wall portion (102) being made, at least partially, of a plastic material, and the first wall portion (100) ) and the second wall portion (102) are arranged to receive the movable cutting blade (24) in the guide slot (96) in a defined coupling.
[0002]
2. STATIONARY BLADE (22), according to claim 1, characterized in that it also comprises a metal component (40), particularly a laminar metal insert, and a plastic component (38) connected to the metal component (40 ), in which at least a central portion of the first wall portion (100) is formed by the metal component (40).
[0003]
STATIONARY BLADE (22), according to either of claims 1 or 2, characterized in that the first wall portion (100) and the second wall portion (102) allow for a fitting coupling with defined clearance of the movable cutting blade ( 24) in the guide slot (96) of the stationary blade (22), and where a height dimension with vertical clearance (lcl) of the guide slot (96) is preferably greater than an expected vertical thickness dimension ( lt) of a movable cutting blade to be assembled (24).
[0004]
4. STATIONARY BLADE (22), according to either of claims 1 or 2, characterized by the first wall portion (100) and the second wall portion (102) allowing a defined coupling with pre-tensioned adjustment of the movable cutting blade (24) in the guide slot (96) of the stationary blade (22), and where a height dimension with vertical clearance (lcl) of the guide slot (96) is preferably less than an expected vertical thickness dimension (lt) of a movable cutting blade to be assembled (24).
[0005]
5. STATIONARY BLADE (22) according to any one of claims 1 to 4, characterized in that the second wall portion (102) comprises at least one projecting contact portion (130) facing the first wall portion (100), particularly at least one contact ridge extends laterally, wherein the at least one protruding contact portion (130) is configured for contact with a bottom surface of the movable cutting blade (24).
[0006]
6. STATIONARY BLADE (22), according to claim 5, characterized in that the at least one protruding contact portion (130) is configured to force the movable cutting blade (24) against the first wall portion (100) in a mounted state.
[0007]
7. STATIONARY BLADE (22), according to either of claims 5 or 6, characterized in that the teeth (36) of at least one toothed anterior edge (30) comprise, when viewed in a plane in cross section perpendicular to a lateral direction (Y), a substantially U-shaped shape comprising a first leg (110) in the first wall portion (100) and a second leg (112) in the second wall portion (102), the first leg (110 ) and the second leg (112) mesh with the tips of the teeth (86), and the second wall portion (102) comprises an inclined portion (116) adjacent to the second leg (112), in which the at least one the protruding contact element is preferably arranged in a transition between the second leg (112) and the inclined portion (116).
[0008]
STATIONARY BLADE (22) according to any one of claims 1 to 7, characterized in that the first wall portion (100) is a basically rigid wall portion and the second wall portion (102) is a basically wall portion flexible, in which at least a central portion of the first wall portion (100) is manufactured from a material comprising an elastic modulus that is greater than an elastic modulus of a material from which at least one central portion is manufactured of the second wall portion (102).
[0009]
9. STATIONARY BLADE (22), according to any one of claims 3 to 8, characterized by the stationary blade (22), particularly the plastic component (38) of it, exhibiting residual stress, specifically residual flexural stresses that are attributable to the distortion related to injection molding, and as a result of the distortion, the at least one anterior edge (30) is flexed back when viewed in a plane in cross section perpendicular to the lateral direction (Y), so that the dimension height with the resulting vertical clearance (lcl) is reduced.
[0010]
10. STATIONARY BLADE (22) according to any one of claims 1 to 9, characterized in that it additionally comprises a span (170) formed in the guide slot (96) in the vicinity of at least one notched front edge (30) , particularly adjacent to the protruding contact portion (130), the span portion (170) comprising at least one of a lower span (180) in the second wall portion (102) and a frontal span (182) in a transition between the first wall portion (100) and the second wall portion (102), the span portion (170) being an internal indentation at least partially concave in shape, the span portion (170) being arranged to provide a remaining gap (lvg, lfg) between the guide slot (96) and a serrated front edge (80) of the movable cutter blade (24) mounted on that portion, and the span portion (170) is adapted for accommodate hair, particularly sections of short hair.
[0011]
STATIONARY BLADE (22) according to any one of claims 1 to 10, characterized in that the first wall portion (100) additionally comprises a perforated section (204) in which a plurality of perforations (206) is preferably provided a perforated section (204) which is arranged in a central portion between a first serrated front edge (30a) and a second serrated front edge (30a), and the perforations (206) comprise, at least partially, cutting edges (216 ) on the side of the first wall portion (100) which faces the opposite side of the skin.
[0012]
12. STATIONARY BLADE (22) according to claim 11, characterized in that the stationary blade (22) is arranged to receive a movable cutting blade (24) comprising a corresponding perforated section (208) in order to define together a region of shaving or epilation with integrated metal foil (202), the cutting edges (216) of the perforations (206) of the first wall portion (100) being arranged to act in conjunction with corresponding cutting edges (218) that are provided on the blade mobile cutter (24) in a shear cutting action by means of the relative movement between the stationary blade (22) and the mobile cutter blade (24).
[0013]
13. STATIONARY BLADE (22) according to either of claims 11 or 12, characterized in that the perforated section (204) of the first wall portion (100) comprises a pattern of perforations (206) which are arranged as circular holes.
[0014]
14. BLADE SET (20), for a hair cutting device (10), in which said blade set (20) is arranged so as to be moved through the hairs in a direction of movement to cut the hairs, said set of blades (20) characterized by comprising: 15. a stationary blade (22) as defined in any of claims 1 to 13; 16. a movable cutter blade (24) comprising at least one notched front edge (80), said movable cutter blade (24) being movably disposed within the guide slot (96) defined by the stationary blade (22 ), so that, by means of the relative movement of the mobile cutting blade (24) in relation to the stationary blade (22), the at least one toothed anterior edge (80) of the mobile cutting blade (24) acts in conjunction with the corresponding teeth (36) the stationary blade (22) to allow the cutting of hair captured between them in a cutting action; the movable cutting blade (24) comes in direct contact, on one side of it facing the skin, with the first portion of the wall (100) and, on one side facing the opposite side of the skin, with the second portion wall (102), particularly in at least one projecting contact portion (130).
[0015]
15. SET OF BLADES (20), according to claim 14, characterized in that the stationary blade (22) is, when seen in a plane in cross section perpendicular to a lateral direction (Y), at least partially flexed backwards so that the movable cutting blade (24) contacts sectionally with the first wall portion (100) and the second wall portion (102), in which a contact area between the movable cutting blade (24) and the first portion of The wall (100) is displaced longitudinally from a contact area between the movable cutting blade (24) and the second wall portion (102).
[0016]
16. BLADE SET (20), according to any one of claims 14 or 15, characterized in that the movable cutting blade (24) is flexed forward when viewed in a plane in cross section perpendicular to the lateral direction (Y), in such a way that the movable cutter blade (24) is received in the guide slot (96) in a vertically preloaded and slightly flexed condition.
[0017]
17. BLADE ASSEMBLY, according to any one of claims 14 to 16, characterized in that the movable cutting blade (24) comprises, on at least one toothed anterior edge (80), upper cutting edges (84) that are configured to act in conjunction with cutting edges (94) on the first wall portion (100), and lower cutting edges (176) that are configured to act in conjunction with lower cutting edges (174) on the second wall portion (102).
[0018]
18. BLADE ASSEMBLY (20) according to one of claims 14 to 17, characterized in that the movable cutting blade (24) comprises a perforated section (208) which is adapted to a perforated section (204) of the stationary blade (22) , with a plurality of perforations (210, 212, 214) being provided in the perforated section, and the perforations (210, 212, 214) of the movable cutter blade (24) at least partially comprise cutting edges (218) on the side facing the skin of the mobile cutting blade (24).
[0019]
19. BLADE SET (20), according to claim 18, characterized in that the perforated section (208) of the movable cutter blade (24) comprises a perforation pattern (210, 212, 214) that comprises a format that is selected from the group consisting of honeycomb-shaped orifice, circular orifice, slit extending longitudinally, oblique slit and combinations thereof.
[0020]
20. BLADE ASSEMBLY (20), according to one of claims 18 or 19, characterized in that, in the assembled state, a territorial surface contact is provided between the perforated section (208) of the movable cutting blade (24) and the section perforated (204) of the stationary blade (22).
[0021]
21. BLADE SET (20), according to one of claims 14 to 20, characterized in that, when viewed in a plane in cross section perpendicular to the lateral direction (Y), the first wall portion (100) and the cutting blade movable (24) are convexly curved, and the first wall portion (100) and the movable cutting blade (24) are, in an uninflected state, curved differently.
[0022]
22. BLADE ASSEMBLY (20) according to claim 21, characterized in that, in an uninflected state, the curvature (230) of the first wall portion (100), particularly of the metal component (40), is different of a curvature (232) of the movable cutter blade (24), and, in the assembled state, the movable cutter blade (24) and the first wall portion (100) are flexed against each other so that the cutter blade movable (24) and the first wall portion (100) come into territorial contact with each other.
[0023]
23. METHOD OF MANUFACTURING A METAL-PLASTIC COMPOSITE STATIONARY BLADE (22), a set of blades (20) for a hair cutting device (10), the method being characterized by comprising the following steps: - provide a metal component (40), particularly a laminar metal component (40), which forms at least substantially a central portion of a first wall portion (100), - providing a mold, particularly an injection mold, the mold being defines a shape of a plastic component (38), - arranging the metal component (40) in the mold, - providing a replacement component in the mold, the replacement component being configured to keep a guide slot to be formed clean (96) of the stationary blade (22) during molding, where the replacement component is adapted to an expected vertical thickness dimension (lt) of a mobile cutting blade to be assembled (24), - forming, particularly via injection molding, the component plastic (3 8), wherein the plastic component (38) and the metal component (40) define a first wall portion (100) and a second wall portion (102) of the stationary blade (22), the first portion being wall (100) is arranged to serve as a skin-facing wall when in operation, the second wall portion (102) is displaced, at least partially, with respect to the first wall portion (100), so that the the first wall portion (100) and the second wall portion (102) define between them the guide slot (96) of the movable cutter blade (24), in which the first wall portion (100) and the second wall portion (102) together form at least one toothed front edge (30) comprising a plurality of teeth (36), and in which the first wall portion (100) and the second wall portion (102) allow a definite coupling of the cutter blade (24) in the guide slot of the stationary blade (22), and - remove the replacement component of the stationary blade that of metal-plastic composite (22).
[0024]
24. METHOD according to claim 23, characterized in that it further comprises the steps of: - processing the metal component (40) including the formation of a perforated section (204) comprising a plurality of perforations (206) in a region center of the metal component (40) in order to define a shaving or epilation region with metal foil (202).

类似技术:

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公开号 | 公开日

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EP3131716A1|2017-02-22|

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ES2684332T3|2018-10-02|

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US20200376695A1|2020-12-03|

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RU2016144805A|2018-05-22|

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CN104999484A|2015-10-28|

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CN104999484B|2019-07-12|

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WO2015158923A1|2015-10-22|

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法律状态:
2020-01-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2020-12-01| B09A| Decision: intention to grant|

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2021-02-09| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/04/2015, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP14165283|2014-04-18|

---

EP14165283.4|2014-04-18|

---

PCT/EP2015/058486|WO2015158923A1|2014-04-18|2015-04-20|Blade set, hair cutting appliance, and related manufacturing method|

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