• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Holding device (1) for a, in particular dental, workpiece (2), with a holding element (3) and a fastening device (4), wherein the workpiece (2) by a relative movement (R) of the fastening device (4) to the holding element (3) on the holding device (1) can be fastened, wherein the fastening device (4) or the holding element (3) has a slotted sleeve, wherein the inner surface of the slotted sleeve forms a clamping surface (M) for the workpiece (2) and wherein during the relative movement ( R) of the fastening device (4) to the holding element (3) the workpiece (2) via the clamping surface (M) on the holding device (1) is clamped.
    公开号:AT516263A4
    申请号:T25/2015
    申请日:2015-01-21
    公开日:2016-04-15
    发明作者:
    申请人:Steger Heinrich；
    IPC主号:
    专利说明:

    The invention relates to a holding device for a, in particular dental,
    Workpiece, comprising a holding element and a fastening device, wherein by a relative movement of the fastening device to the holding element, the workpiece is attachable to the holding device. Furthermore, the invention relates to a set with such a holding device and a dental workpiece. Moreover, the invention also relates to a processing machine having such a holding device. Furthermore, the invention relates to a method of manufacturing a holding device and a processing machine for carrying out this method.
    In dental laboratories, various devices, such as CNC machines, have been used for many years to automatically produce dental workpieces. An important aspect here is that the dental workpiece, which is usually present as a blank, is held well, so that an exact machining of the dental workpiece via a machining tool is possible. There are already various holding devices, which usually have a kind of holding element (also called holding frame or carrier plate) and a fastening device for the workpiece on the holding element.
    An example of this is disclosed in DE 100 37 531 A1. This shows a device for the production of dental workpieces. A recess for the blank is provided in a carrier body. With the outside of the carrier body is clamped in a processing machine. The blank is connected only to a part of the recess. A central rectangular recess serves to receive the cylindrical blank. The blank is adhered to two opposite surfaces with the corresponding walls of the recess. This adhesive holder is relatively complex and leaves residues. Also shown is an embodiment with an adhesive-free holder, thus a mechanical positive connection. This is achieved by the blank itself having two opposed mushroom-shaped lugs which engage in a recess. A disadvantage of this variant that the blank must be self-complicated complicated. In addition, the stress on the blanks in the region of the lugs or in the extended region is relatively high. In this direct
    Connection variant, therefore, damage to the blank, especially by the high pressure load can not be excluded.
    A further holding arrangement for workpieces is evident from EP 2 026 931 B1. Accordingly, a clamping frame has a recess, with freely projecting support parts being formed on the clamping frame inwardly. In addition, a clamping device is provided on the clamping frame. About this clamping device frame-shaped holding arrangement is fixed to the clamping frame. In turn, in this holding device, the workpiece is glued or welded. It is preferably held non-positively and / or positively. It is generally stated that the work piece together with the holding arrangement can be inserted firmly and non-displaceably by means of a clamping device in a machining device, namely on a clamping frame which can be inserted there. But how exactly the positive and / or positive connection between the workpiece and the holder arrangement is not explained in this document.
    US 2009/0274994 A1 shows a dental milling machine based on a CNC machine. Here, the individual blanks are fixed to the support frame via a projection. It is not discussed in more detail on the exact attachment, but rather is that smaller and larger blanks can be attached.
    DE 20 2010 001 125 U1 also shows a device for holding and / or clamping blanks used for producing tooth replacement parts. For this purpose, an outer annular receiving device is provided with a receiving opening. The blank can be held directly by means of clamping means or clamping claws in the receiving device. But it is also possible that instead of a large blank, an adapter is inserted into the receiving device, in turn on this adapter, a blank or more blanks are attached. The clamps are releasably or replaceably mounted on the receiving device. It can be used of different lengths Spannpratzene to capture different thickness blanks. The disadvantage here is that the clamping claws lie directly on a relatively small area of the blank, whereby a relatively high pressure in this area acts on the blank. This can lead to undesired deformations or overloading of the blank material.
    Furthermore, WO 2013/117540 A1 shows a blank holder for a metal milling machine. Accordingly, there is an outer clamp holder and an inner workpiece holder, on which in turn a support projection for the blank is formed. In addition, a clamping device is provided, which presses the blank against the support projection. The clamping device is detachably mounted on the workpiece holder via screw bolts. There is thus a jamming of the blank between clamping device and supporting projection. Again, it is disadvantageous that there is a direct jamming in a small area of the blank and the blank must have a relatively complicated shape. Also, relatively many components are required for attachment.
    Furthermore, DE 41 37 563 C1 is also known, which shows a device for receiving workpieces of varying dimensions. Blanks with different outer contour are clamped between prism holders. For uniform mutual opening cams are provided which engage in semi-circular recesses of a cam. Due to the curved contour of the recesses, the travel assumed by the prism carriers is identical and, in each case, the same amount relative to the theoretical center axis. There is thus a curve-guided constriction of clamping surfaces. Again, for the attachment relatively many components are necessary.
    DE 10 2010 061 116 A1 also shows a method for producing dental workpieces, wherein a workpiece is connected with a glued frame for attachment in a workpiece holder by clamping action. The workpiece itself can be provided with a projecting shoulder or with a notch in which engages a congruent counterpart of the clamping device in the region of a Achsein shape of a wedge. This clamping effect also takes place disadvantageously directly on a relatively small area of the workpiece and can thus cause damage in the workpiece to be held.
    The object of the present invention is therefore to provide a prior art improved holding device or an alternative holding device. In particular, the holding device should be constructed simple design and a secure hold of the workpiece can be guaranteed.
    This is achieved by a holding device having the features of claim 1. According to the invention it is provided that the fastening device or the holding element has a slotted bushing, wherein the inner surface of the slotted bushing forms a clamping surface for the workpiece and during the relative movement of the fastening device to the holding element Clamping surface is clamped to the holding device. This slotted sleeve thus allows for extensive attachment of the workpiece to the support device. Advantageously, the force for gripping is distributed over a large area of the workpiece. The holding device according to the invention can also be used in the prior art as an improved holding possibility for a workpiece. be applied.
    The exact design of the slotted socket is arbitrary per se, as long as by the relative movement between the holding element and fastening device a VerVerspannung of the workpiece takes place on the holding device. However, it is preferably provided that the slotted bushing is formed partially annularly around a longitudinal axis with a preferably axially aligned slot. The purpose of the slit is primarily to tighten the slotted sleeve during clamping and thereby clamp the workpiece to the holder.
    It is particularly preferred for the slotted bushing that the clamping surface of the slotted bushing can be applied to the workpiece and the clamping surface has a first clear width corresponding to a loose state of the slotted bushing, wherein the relative movement of the fastening device to the retaining element narrows the slot, the clamping surface to a second , a strained state of the slotted socket corresponding to the clear width can be reduced. Especially if the slotted bushing is formed on the basis of a circular cylinder, the narrowing of the slotted bushing can also be defined by the inner diameter instead of by the clear width.
    Furthermore, it is preferably provided that the holding element and the fastening device have corresponding wedge surfaces with each other, by the relative movement of the fastening device to the support member via the abutting guide or wedge surfaces, the fastening device fastened to the support member, preferably wedged, by moving along the guide or Wedge surfaces are the most common games between retaining element, fastening device and work better compensated. That is, if there are small differences in the actual dimensions of the components involved, the attachment still guarantees a secure and stable hold of the fixture on the retainer and thus the workpiece on the fixture.
    With regard to the design and arrangement of the slotted socket, two different embodiments are explained in detail in this application. According to a first embodiment it is provided that the slotted bushing is formed separately from the retaining element as part of the fastening device. According to a second embodiment - which will be explained in more detail below - the slotted bush is formed integrally with the retaining element. In the following, the first embodiment will be explained in more detail.
    With regard to the first embodiment, the exact configuration of the guide surfaces or wedge surfaces per se is arbitrary. For example, the leadership or. Wedge surfaces be designed as planes. Preferably, however, it is provided that the guide or wedge surfaces are formed at least partially conical. In other words, cone-shaped means that the guide or wedge surfaces are at least partially cone-shaped. As a result, not only pure wedging but also centering is possible.
    Furthermore, it is preferably provided that the guide or wedge surface of the holding element is formed by an at least partially conical inner surface of the holding element. Thus, the holding element forms an outer component of the holding device, with the inner surface forming the wedge surface. For this purpose, it is also preferably provided that the guide or wedge surface of the fastening device is formed by an at least partially conical outer surface of the fastening device. Thus, the fastening device forms an internal component of the holding device. For the connection between the fastening device and the holding element is basically a purely linear movement is sufficient. In addition, it may additionally be a rotary component during the relative movement. Thus, it is sufficient for a dental technician to manually position the retainer, the fixture, and the dental workpiece, and wedging by sliding the fixture to the retainer, thereby simultaneously clamping the dental workpiece to the fixture. Preferably, however, it is provided that the holding device itself has additional guide components, so that the relative movement can be guided for the fastening.
    According to a preferred embodiment, it is therefore provided that in the holding element at least one, preferably at least partially thread-shaped, guide is formed and that the fastening device has at least one guide engaging nose, wherein by turning the fastening device with engaging in the nose of the guide or wedge surfaces the fastening device and the retaining element to move in the axial direction and wedge. A reverse design (guide in fastening device and nose on retaining element) is conceivable.
    Furthermore, it is preferably provided that the guide or wedge surface of the holding element defines a recess in the holding element and the recess forms a broad side and a narrow side, wherein the maximum diameter of the recess on the broad side is greater than the maximum diameter of the recess on the narrow side.
    In order to cause the axial relative movement for the attachment or keying, it is preferably provided that the guide has a guide surface which is inclined to a transverse plane oriented at right angles to the longitudinal axis, preferably at an angle of 2 ° to 15 °. In order to also produce the desired direction for the relative movement, it is preferably provided that the guide surface is inclined in the direction of the narrow side.
    It is irrelevant in which exactly the leadership is formed, as long as the Nasein can intervene in the leadership. Thus, the guide may well be formed in the middle region or in the region of the broadside. According to a preferred embodiment, however, it is provided that the guide is formed in the region of the narrow side of the recess in the holding element.
    In order to be able to guarantee a suitable positioning when assembling the fastening device with the retaining element, it is preferably provided that the retaining element has at least one axially aligned groove forming the inner surface and corresponding to the at least one lug. Specifically, the positioning is accomplished by guiding the fixture over the groove engaging the groove on the support member whereby, during relative movement, the fixture is linearly axially movable along the groove. For a user-friendly and intuitive positioning and fastening it is preferably provided that the groove and the guide merge into one another, whereby the groove and the guide, by cooperation with the nose of the fastening device, predetermine the relative movement in the form of a bayonet-type fastening movement for the fastening device on the string element.
    Besides the holding member and the fixing device, the holding device according to the first embodiment may also include a tool for performing the relative movement of the fixing device to the holding member. Thus, the dental technician need not only connect the two components holding element and fastening device with his hands alone. Preferably, it is provided that the tool has connecting elements for positive engagement with the fastening device, whereby the fastening device is at least rotatable relative to the retaining element by the tool. Correspondingly, suitable connecting counterparts to the connecting elements of the tool can be provided in the fastening device.
    In the second embodiment - in which the slotted bushing is part of the retaining element - it is preferably provided that the fastening device comprises at least one clip with two spaced apart clip surfaces corresponding to the guide surface of the fastening device, with the clip surfaces of the fastening device in the region of the slot facing away from the clamping surface, spaced-apart bracket mating surfaces - which correspond to the guide or wedge surface of the holding element - can be applied.
    In order to easily enable keying between the retaining element and the fastening device, it is preferred that the spaced-apart clamping surfaces have a minimum distance from one another which is less than the distance between the clamping surfaces in the loose state of the slotted sleeve.
    In order to even allow the connection between the holding element and the fastening device, preferably obliquely oriented guide sections are formed on the clamping surfaces of the fastening device. For this purpose, it is preferably provided that by the relative movement of the clamp to the support member by the abutting against the clip abutment guide portion, the clamping surfaces are mutually movable, so that narrowing of the slot, the clamping surface is reduced to the second, corresponding to the clamped state of the slotted sleeve inner diameter, in which the minimum distance of the Kiammerflächen Equal to each other again is the distance between the clamp counter surfaces.
    Preferably, it is further provided that a plurality of separate workpieces can be braced via respective slotted bushes on the holding device. Here progeschlitzter socket may be provided an associated bracket. In other words, the fastening device has at least two, preferably regularly arranged, staples, wherein each clip corresponds in each case to one of at least two slotted bushes formed in the retaining element.
    In order to clamp a plurality of workpieces as quickly as possible, it is particularly preferably provided that the fastening device having a plurality of clamps is formed in one piece. Thus, by the relative movement of this single, one-piece fastening device, multiple workpieces can be clamped simultaneously to the fixture. Preferably, the fastening device is designed to be star-shaped.
    The scope of protection of the holding device according to claim 1 refers only to the at least two-part holding device per se. However, it may well also be provided that at least one workpiece, preferably a plurality of prefabricated workpieces, is also included in the scope of delivery. Therefore, protection is also desired for a set with a holding device according to the invention and at least one dental workpiece. This workpiece can have a variety of shapes. For ease of manufacture and mounting, the workpiece is in the form of a right circular cylinder.
    Protection is also desired for a processing machine, in particular a CNC machine, with a processing tool and an inventive
    Holding device for a workpiece. In order to enable movement of the clamped workpiece, it is preferably provided that the machining machine has a movable, preferably cardan-hinged, positioning device, wherein the holding device is releasably securable to the positioning device. With this processing machine, the workpiece can then be machined in a dental workpiece production mode via the machining tool.
    In order not only to obtain protection for the concrete holding device, protection is also desired for a method of manufacturing a holding device according to the invention in a processing machine, in particular in a CNC machine. This method can be carried out in the same processing machine in which the machining of the workpiece takes place. Here, it is particularly preferably provided that in a holding device production mode of the processing machine from workpieces clamped in the processing machine, the holding element and the fixing device of the holding device can be produced, preferably milled, preferably by setting the holding device production mode on the basis of in a memory and of the Processing machine readable and executable data of the holding member and the fastening device is performed.
    However, protection is sought not only for the processing machine having a holding device according to the invention, but also for a processing machine for carrying out the manufacturing method of a holding device. It is envisaged that stored in a memory of the processing machine, the holding device production mode for producing the holding device, wherein the holding device production mode is unlocked by entering a code. Thus, in future implementations of processing machines, the corresponding fixture production mode may already be deposited in the processing machine. If the owner of this processing machine then also wishes to have his own production of the holding device according to the invention, he can obtain the corresponding holding device production mode.
    Alternatively, however, it is also conceivable for a purchaser to retrofit his already existing processing machine with a holding device production mode. Therefore, protection is also sought for a data carrier on which the inventive production method takes the form of data readable by a processing machine and executable as a holding device production mode for the production of the holding device is stored.
    Further details and advantages of the present invention will become more apparent from the following description of the figures with reference to the embodiments shown in the drawings. Show:
    1a to 1c different embodiments of a dental workpiece,
    2 shows schematically the section through a first embodiment of a holding device,
    3a and 3b different views of a fastening device,
    4a to 4c different views of a holding device when viewed from the narrow side,
    5a to 5d different views of the holding device when viewed from the broadside,
    6a to 6d, the holding device in the loose state of the slotted socket,
    Fig. 7a to 7d, the holding device in the clamped state of the carved
    Rifle,
    8a to 8e various views of a tool,
    9a and 9b, views of a second embodiment of a holding device,
    10a and 10b views of the fastening device,
    11 a and 11 b views of the workpiece,
    FIGS. 12a to 12c are views of the holding device in the case of a tensioned slotted bush, FIG. 13a and 13b schematically show the difference between loose and strained slotted bush,
    14a to 17c are views of a further variant of the second embodiment,
    Fig. 18a, a processing machine with a schematically illustrated
    Control unit,
    Fig. 18b, the detail of the positioning device of Fig. 18a and
    19a and 19b, the processing machine with a holding device according to the second embodiment.
    The basic idea of the present invention is based on the attachment of geometrically simple dental workpieces 2. These dental workpieces 2 are preferably made of zirconia. However, other materials such as plastics, sintered metals, mixed materials, etc. may be used. A preferred variant of such a zirconia block 2 is shown in Fig. 1a, according to which the dental workpiece 2 is circular-cylindrical in shape and has no further steps or bulges the dental workpiece 2 rests or would allow an attachment. This frictional connection takes place via the lateral surface U of the dental workpiece 2. In FIGS. 1b and 1c, alternative embodiments of the dental workpiece 2 based on a rectangular base or a triangular base are shown.
    Fig. 2 illustrates schematically the attachment of a dental workpiece 2 on a holding device 1. The holding device 1 has for this purpose two components, namely the holding element 3 and the fastening device 4. In the attachment, first the workpiece 2 is inserted into the recess 8 formed in the holding element 3. At the same time, the fastening device 4 is pre-positioned. In this case, according to FIG. 2, the fastening device 4 is formed in section as a simple wedge. In this case, the fastening device 4 has a Keilfläche K4, which corresponds to the inner surface of the holding member 3 forming Kungefläche K3. As a result of this guide or wedge surface K3 of the holding element 3, the maximum diameter Db of the recess 8 on the broad side B of the holding element 3 is greater than that
    Maximum diameter Ds of the recess 8 on the narrow side S. Thus, the recess 8 tapers from the broad side B toward the narrow side S (this corresponds to the first embodiment). By a relative movement R of the fastening device 4 in the direction of the longitudinal axis L, the guide surfaces K3 and K4 move together, whereby the lateral surface U of the dental workpiece 2 between the clamping surface M of the fastening device 4 remote from the guide surface K4 and the retaining element 3 is clamped or pinched. In this case according to FIG. 2, it is of course also possible-as will be shown in later embodiments-that the fastening device 4 is arranged in the form of a ring (and thus also on the right) around the dental workpiece 2. However, the simplest functional variant of the holding device 1 is illustrated in FIG. As a result of the relative movement of the fastening device 4 in the direction of the arrow, the workpiece 2 thus moves from a loose state Z1 into a tensioned state, in which the slotted bushing is in a fastened or wedged state Z2 on the holding device 1. In this strained state Z2, the space for the dental workpiece 2 inside the holding device 1 is narrowed in such a way that the dental workpiece 2 is clamped to the holding device 1 and is thus frictionally clamped or held.
    FIGS. 3a to 8e show a first exemplary embodiment of a holding device 1. In contrast to the embodiment according to FIG. 2, it can be seen in FIG. 3a that the fastening device 4 has a partial ring shape and thus forms the slotted sleeve. For this purpose, the slotted socket of the fastening device 4 has a slot 5. This slot 5 does not have to be continuous, but may also be formed so long that a reduction in the inner diameter D is possible. This slot 5 also does not have to be a recess. "Free space" is formed, but may also be filled with a resilient material. Also, this slot 5 does not have to be aligned exactly in the axial direction, but may well also be inclined and thus not parallel to the longitudinal axis. However, this slot 5 is preferably aligned continuously and in the axial direction. The fastening device 4 has on the outer side or outer surface the guide or wedge surface K4. On the inner surface of the fastening device 4, the clamping surface M is formed. This can in principle be flat or flat throughout, so that it lies in the clamped state Z2 continuous flat or flush on the workpiece 2.
    In the concrete embodiment according to FIG. 3a, however, depressions 20 are provided. These recesses 20 or grooves provide for a better retention of the dental workpiece 2. These recesses 20 may also be spirally formed or have other shapes, which serve the purpose of better attachment.
    FIG. 3b shows the fastening device 4 in a side view. Here the cone-shaped formation of the guide or wedge surface K4 is particularly well recognizable. Preferably, the guide or wedge surface K4 (as well as the guide or wedge surface K3) by an angle ß between 1 ° and 15 °, preferably between 2 ° and 10 °, inclined to the longitudinal axis L.
    In Fig. 4a, the holding device 1 is shown with a view of the narrow side S of the holding element 3. In the holding element 3, a total of five recesses 8 are formed, which each form an inner, guide or wedge surface K3 of the holding element 3. In addition, in Fig. 4a, the guide surfaces F of the guide 6 can be seen. These correspond with the lugs 7 formed on the fastening device 4. In addition, the grooves 9 oriented in the axial direction can be seen in the retaining element 3. Also visible is the slot 5 of each fastening device 4. At the border of the retaining element 3, the clamping surfaces 18 are regularly arranged, via which a releasable attachment of the entire holding device 1 to a positioning device 15 of a processing machine 13 takes place.
    4b shows the section i-i through the holding device 1 according to FIG. 4a. It is identifiable that the guide 6 is formed on the narrow side S of the holding element 3. The guide 6 goes into the groove 9 via. In addition, the guide surface F of the guide 6 can be seen, which is inclined by the angle α to the transverse plane Q oriented perpendicular to the longitudinal axis L in the direction of the narrow side S. It follows that, when the nose 7 of the fixing device 4 abuts the guide surface F when the fixing device 4 is rotated relative to the retaining element 3, there is a compelling relative movement R of the fastening device 4 in the direction of the longitudinal axis L towards the narrow side S, whereby the wedge surfaces K3 and K4keke.
    Fig. 4c shows in a perspective view, the holding device 1 in turn, viewed from the narrow side S. It can be seen that the fastening devices 4 are still in the loose state Z-i. However, a slight wedging between the guide surfaces K3 and K4 may already be present. However, this is not yet sufficient to sufficiently clamp a dental workpiece 2, not shown in this FIG. 4c, within the fastening device 4.
    FIGS. 5a to 5d show the same exemplary embodiment as well as the same state Z1 as in FIGS. 4a to 4c. In FIG. 5 a, however, the holding element 3 together with the fastening device 4 is shown from the broad side B. From the broad side B, the connecting counterparts 19 formed in the fixing device 4 for the tool 10 to be shown later are also apparent.
    In Fig. 5b is a side view of the holding member 3 is shown, wherein the clamping surfaces 18 are clearly visible.
    5c shows the section ii-ii through the holding device 1 according to FIG. 5a. The conical guide surfaces or wedge surfaces K3 and K4 of the holding element 3 or of the fastening device 4 lying adjacent to one another can be seen.
    FIG. 5 d shows a perspective view of the holding device 1 from the viewing direction broadside B. The transition from the axially aligned groove 9 into the guide 6 oriented slightly inclined to the transverse plane Q is clearly recognizable.
    The relative movement R of the fastening device 4 to the retaining element 3 is shown by dashed lines in FIG. 5d, this forced guidance being effected by the nose 7 of the fastening device 4 corresponding to the groove 9 and the guide 6. This relative movement R forms a bayonet-type fastening movement for the fastening device 4 on the holding element 3.
    Fig. 6a shows the holding device 1 in a loose state Z ^ of the fastening device 4. Nevertheless, a dental workpiece 2 is already arranged in the holding device 1.
    In Fig. 6b it can be seen that the slit 5 in the slotted socket of the fastening device 4 is still open. As a result, there is still no sufficient clamping between the dental workpiece 2 and the holding device 1. InFig. 6b also illustrates that the holding device 1 is formed by the fastening device 4 and by the holding element 3. The holding device 1, in turn, forms the set 12 together with the at least one dental workpiece 2.
    In Fig. 6c, the section iii-iii through the set 12 shown in FIG. 6b. The clamping surface M of the slotted bushing of the fastening device 4 that can be applied to the work piece 2 still has a first inner diameter Dt corresponding to a loose state Zi of the fastening device 4.
    Also from Fig. 6d, this larger inner diameter Di is still open slot 5 out.
    In contrast, FIGS. 7a to 7d show the holding device 1 when the state Z2 of the fastening device 4 is wedged on the holding element 3. As shown in FIG. 7a, the slit 5 of the slotted bushing of the fastening device 4 has already narrowed, as a result of which the clamping surface M lies flush against the jacket surface U of the workpiece 2. This narrowing of the slot 5 can also be seen from FIG. 7b, as a result of which the clamping surface M of the fastening device 4 is reduced to a second inner diameter D2 corresponding to a strained state Z2 of the slotted bushing of the fastening device 4. This reduced second inner diameter D2 can also be seen from FIGS. 7c and 7d. Above all, a comparison of FIGS. 6d and 7d shows-schematically and exaggeratedly shown-the change in diameter between the loose state Z1 and the strained state Z2.
    Figs. 8a to 8e show different views of the tool 10 having the connecting elements 11 formed as projections. These connecting elements 11 correspond to the connecting counterparts 19 formed in the fastening device 4. When such a tool 10 is applied to a fastening device 4, for example according to FIG. 6a, the nose 7 is also moved along the guiding surface F of the guide 6 by turning the tool 10, so that the fastening device 4 is moved relative to the holding member 3 in the direction of the narrow side S and thereby the Sapnnfläche M of the fastening device 4 narrows under Einklipung of the dental workpiece 2.
    A second embodiment of a holding device 1 is shown in FIGS. 9a to 17c. In this second embodiment, the slotted sleeve is integrally formed with the holding member 3.
    According to FIG. 9a, in the plan view of the retaining element 3, it can be seen that the slotted bush consists essentially of the two brackets 26 and the slot 5. In this case, the holding element has a total of six such slotted jacks, each with two brackets 26. The inner surface of each slotted socket forms a clamping surface M for the workpiece 2. Some flexibility of the bracket 26 is guaranteed by the recess 27. At each bracket 27, a bracket counter surface G is formed in a region facing away from the clamping surface M. In the loose state Zi of the slotted bushing of Fig. 9a, the brackets opposite surfaces G of two brackets 27 of a slotted bushing are spaced apart by the distance Aq. In Fig. 9b, the same holding element 3 is shown in perspective.
    10a and 10b show the fastening device 4, which has a plurality of brackets 24 each having two clamping surfaces H. The total of six brackets 24 are integrally formed and together form the fastening device 4. The clamping surfaces H of the brackets 24 have a minimum distance Ah to each other. The clip surfaces H, together with the guide portions 25, form the guide surfaces K4 of the fixture 4. These guide portions 25 are formed as rounded edge portions of the fixture 4.
    FIGS. 11 a and 11 b show a workpiece 2, which can be braced on the holding device 1.
    The bracing of a workpiece 2 on the holding device 1 according to the second embodiment takes place in that first in a holding element 3 as shown in FIG. 9a the desired number of workpieces 2 are inserted into the recesses 8 provided for this purpose. Since the slotted sockets of this holding member 3 are still in the loose state Z-i, the insertion of the workpieces 2 into the recesses 8 is easily possible. This insertion of the workpiece is illustrated in Fig. 13a, with the distance AG between the clip abutment surfaces G and thus the size of the slot 5 exaggerated. It can also be seen that the workpiece 2 does not (or hardly) contact the holding element 3, since the inside diameter Ü! in the loose state Z ^ is even greater.
    Once the desired number of workpieces 2 is inserted into the holding element 3, the, preferably star-shaped, fastening device 4 is inserted into the center of the holding element 3. First, the guide portions 25 contact the clamp counter surfaces G of the slotted bushes of the holding member 3. By the relative movement R of the fixing device 4 in the direction of the longitudinal axis L, the brackets 26 of the slotted sleeves are moved toward each other due to the inclined guide portions 25 until the clamp opposing surfaces G contact the clamp surfaces H. Thus, the distance AG between the bracket opposing surfaces G of a slotted sleeve corresponds to the minimum distance AH between the clamping surfaces H, as illustrated in Fig. 13b. As a result of this relative movement R, the stirrups 26 move relative to one another, reducing the inner diameter D2 of the slotted bushing, as a result of which the workpiece 2 is clamped over the circumferential surface U on the clamping surface M of the slotted bushing. 12a to 12c, the state is shown when a total of six workpieces 2 are clamped in a holding element 3 via a fastening device 4. Particularly advantageous in this embodiment is that by a single relative movement R of the fastening device 4 to the holding element 3 all workpieces 2 at the same time on the holding device 1 are clamped. It is also possible to leave a few recesses 8 free and also, for example, to fix only a single workpiece 2 in such a holding element 3.
    FIGS. 14a to 17c show a further variant of the second exemplary embodiment, wherein only one workpiece 2 can be clamped in this holding element 3. In the same way as in the first variant, a slotted bushing with two brackets 26 is provided, together with two clamping surfaces G (see FIGS. 14a and 14b). The fastening device 4 according to FIGS. 15a and 15b is formed by a clamp 24 with two spaced-apart clamping surfaces H. The workpiece 2 has a rectangular base with rounded side edges. As soon as this workpiece 2 is inserted into the recess 8 in the retaining element 3, the fastening device 4 (clip 24) becomes as in FIGS. 17c are slid over the guide portions 25 until the clamping surfaces H and the abutting surfaces G contact each other, whereby the clamping surface M holds the workpiece 2 on the holder 1. In this case, the entire inner diameter of the clamping surface M is not reduced, but the clamping surface M is pressed more intimately against the workpiece 2 by the amount of reduction of the slit 5, whereby it is tightened sufficiently firmly on the holding device 1.
    Fig. 18a shows a processing machine 13 in the form of a CNC machine. This CNC machine has a positioning device 15 according to the detail of Fig. 18b. This positioning device 15 may have several Kardangelangelenkartig arranged components. In particular, as the innermost structural unit, a retaining ring 23 is provided, on which over the
    Fixing means 22 a holding device 1 or a set 12 is detachably fastened. The held on the positioning device 15 on the holding device 1 and movable by this positioning device 15 dental workpieces 2 can then be machined or machined by the machining tool 14. This processing operation is controlled by the control unit 21 shown schematically in Fig. 18a. For this purpose, the dental work piece production mode P2 can be executed by the control or regulating unit 21. In addition, however, it is also possible that a holding device production mode Pi can be executed by the control or regulation unit 21. For this purpose, data N (preferably in the form of CNC files) is stored in a memory 16 of the control or regulating unit 21. In order to produce the holding device 1 itself in the processing machine 15, by inputting a code, the holding device production mode Pi can be unlocked. As an alternative variant, it is also possible for the production mode P1 to be retrofittable to an already existing processing machine 13 via a data carrier 17 (eg USB stick) on which the executable data N (CNC files) are stored. FIGS. 19a and 19b show the positioning device 15 with a clamping fixture 1 according to the second embodiment.
    The invention can also be summarized and described again with the following other words:
    The fastening device 4 can also be referred to as a conical counterpart to the retaining element 3 or as a clamping ring. This clamping ring is ambesten in Fig. 3a recognizable. On the outside of this fastening device 4 is the conical surface as a guide or wedge surface K4, which corresponds to a cut-out or recess 8 of the supporting plate 3 formed as a support plate. In the middle, the fastening device 4 has a bore or recess, which does not necessarily have to be concentrically positioned. It is additionally provided that recesses 20 or grooves are provided on the inner surface of this fastening device 4, which later ensure a better grip of the dental workpiece should. The fastening device 4 preferably has two lugs 7, which allow a joining of fastening device 4 and retaining element 3 only in certain positions, namely, when the lugs 7 and the grooves 9 lie exactly above each other. Then, when the two parts are joined together until the tapered surfaces l <3 and K4 contact, another feature of the fixing device 4 comes to be carried. Namely, this fastening device 4 has on one side an opening in the form of a slot 5, which preferably extends from the upper edge to the lower edge.
    Thus, the clamping ring (fastening device 4) is opened circumferentially. When the fastening device 4 in the inserted position is turned over the auxiliary bores (connecting counterparts 19) by means of a key (tool 10) shown in Figs. 8a to 8d, circumferential collapse of the clamping ring (inner diameter D of the clamping surface M of the fixing device 4 decreases yourself). This is because the lugs 7 of the fixing device 4 slide over the spiral surface (guide surface F) of the holding member 3, thus pulling it toward the conical taper. In the direction of rotation, therefore, the distance between the front side of the holding element 3 and the surface of the guide 6 increases. In order to allow uniform tightening, at least two lugs 7 are provided, which are preferably formed exactly opposite each other. However, it should not be ruled out that more lugs 7, to match also grooves 9 and guides 6 are provided. These also do not have to be evenly distributed on the circumference. The same applies to the slot 5. Accordingly, Fig. 3 shows only a preferred embodiment. Thus, it may well be possible that the slot 5 in the longitudinal direction L, the fastening device 4 on one side circumferentially not opened, but several slots 5 are provided. Of course, for such a variant, the retaining element 3 must again have the necessary structural features for a perfect interaction.
    Another essential part of a set 12 is the block (dental workpiece 2), which preferably consists of zirconium (see especially Fig. 1a). The preferred embodiment is a cylindrical block without any additional material deletions, e.g. B. the circumference along running grooves or areawise protrusions. This block is then inserted into the bore of the clamping ring (fastening device 4). This can be done at the time when the clamping ring is not yet arranged in the support plate (support member 3) or when the clamping ring is positioned in the support plate but not yet tightened, which is why it has come to no reduction in Umfangs.Gemäß Fig. 6a can be seen how the workpiece 2 is inserted in the fastening device 4 and is still air along the circumference between the fastening device 4 and workpiece 2. Now, when the fastening device 4 is rotated in the inserted position, the inner diameter D of the fastening device 4 decreases and settles around the, in this case circumference, of the dental workpiece 2. This can be clearly seen in Fig. 7c. In addition, it is clear that the compressive force generated by the cone is transmitted to the dental workpiece 2 only over certain parts of the surface of the fastening device 4. These are those areas which have no recess or the like.
    Since a similar pressure force is always generated by turning the fastening device 4, which is then transferred to the dental workpiece 2, the efficiency of the holding device 1 can be determined by the configuration of the grooves. Should it be dispensed with the recesses or depressions 20, the pressure force is evenly distributed over the entire contact area. Thus, considering only a small portion of the surface of the dental workpiece 2, the force acting thereon is relatively small. Now, however, Eindrehungenbzw. Recesses 20 are provided, which reduce the contact surface on the half, so also the same pressure force, as in the case mentioned above, but now divided over half the area. Considering now again an equal part of the dental workpiece 2 as before, which is acted upon by the pressure force, it comes to a twice as large holding force. With a certain force, however, it inevitably leads to a deformation of the dental workpiece 2. This can be intentional, but it can also happen unintentionally. A slight deformation promotes stability in the axial direction. However, the reduced block after a processing volume block is partially weakened and thus unstable. The variants shown in FIGS. 3 to 13a always refer to a circular cylindrical block. However, with proper sizing and design, this principle can be transferred to other blocks (dental workpieces 2) of polygonal cross-section (see Figs. 14a to 17c).
    The retaining element 3 is preferably made of PMMA and the fastening device of POM. In principle, however, any other materials may be used which are also suitable for the task. For example, the holding member 3 may be made of a stainless steel, and the fixing apparatus 4 may be made of aluminum. Preferably, the material of the fastening device 4 is always softer and thus more easily deformable than the retaining element 3.
    With reference to Fig. 18a, it will be explained again that a customer can be provided with the necessary components of the invention in the form of a holding device 1. However, it may also be provided to provide the customer with the retaining element 3 and the fastening device 4 as a blank, ie without conical surfaces, milled out noses, etc. If the customer is already in possession of a processing machine 13 of the applicant, then it is possible for him to obtain these rough blocks in the processing machine 13 to clamp and manufacture the inventive parts of the holding device 1 independently. In that case, the customer then only needs to purchase the data carrier 17 with the data N (CNC files) and the raw blocks or to enable the holding device production mode Ρί already stored in the processing machine 13 by entering a code to be purchased.
    Both embodiments show a holding device 1, with which workpieces 2 (zirconium blocks) can be clamped non-positively. In this case, the possibilities presented are such that the clamping force is applied to a large part of the peripheral surface (lateral surface U). The basic idea is to insert the blocks (workpieces 2) into the fixture 1 first. By being compliant, preferably made of POM, and having a relatively narrow slotted sleeve, the holding device 1 is correspondingly flexible and then also conforms to the blank (workpiece 2). This is also the case should the blank be slightly larger, as the recess 8 of the holding device 1.
    With particular regard to the second embodiment (see FIGS. 9a to 13b), it should be noted that the clamping wedge (fastening device 4 in the form of the clip 24) can be inserted as soon as the workpieces 2 are inserted. The clamping wedge is in this case designed so that it tapers on the top and bottom (guide portion 25), so that it can be easily pressed. The impressions are here only by hand force. Depending on how wide the protruding pins are or how small the minimum distance AH is, the clamping force is higher or lower. The wider they are, the higher the resilience exerted on the blank. In this embodiment, care should be taken that two workpieces 2 are always clamped opposite one another, since otherwise the clamping mechanism is too unstable. If you only want to clamp a workpiece 2, you should insert a "blind plug" on the opposite side. The tension wedge is preferably made of PMMA since this material has good sliding capabilities. In general, it should be said that for each partial other materials can be used, which fulfill the purpose of Fixierung. The illustrated embodiment accommodates six blanks, and may be more or less. At the top, the number is then limited only by the space requirement.
    In the further variant (FIGS. 14a to 17c) of the second exemplary embodiment, the blank no longer has a round shape but has a substantially cuboidal shape. It can be seen that the clamping mechanism is based on the same principle as the first variant of the second embodiment. In this case, a fixed guide / stop for the blank is provided on the slot 5 facing away from the lower side of the Halteelements3. On the upper side, the clamping force is then applied again via the clamping wedge (clamp 24). In this case, the clamping surfaces H of the clamping wedge substantially the same geometry as in the first variant. Of course, this refers to these significant and functional areas of the wedge. Also in this variant, in turn, the block, preferably zirconia block, inserted into the clamping block (holding element 3) and then the clamping wedge inserted by manual force.
    Both variants of the second embodiment are designed so that the blank is enclosed over a large area and only at one point (slot 5) this "shell" is interrupted. It is precisely this location that the tension wedge attempts to reduce the open area of the shroud, thereby exerting a circumferential force on the blank. Another advantage of this is that the wedge does not come into direct contact with the blank and no tools for tension are required. Thus, this system is very user friendly.
    Ideally, the blanks (workpieces 2) have the same height as the tensioning mechanism (fixture 1), thus, in use, one can simply lay all the components on a table and squeeze everything together. Should the blanks be lower or higher, a shim may be added to allow a central position of the blank in the chuck block.
    The entire set 12 can then be clamped in a milling system (processing machine 13). Depending on whether individual work or multi-unit dental work is to be made, one can choose between the different variants.
    List of suffixes: 1 holding device (clamping block or clamping mechanism) 2 workpiece (blank) 3 holding element (holding frame or carrier plate) 4 fixing device (clamping wedge) 5 slot 6 guide 7 nose 8 recess 9 groove 10 tool 11 connecting elements 12 set 13 processing machine 14 processing tool 15 positioning device 16 Memory 17 Data carriers 18 Clamping surfaces 19 Connection counterparts 20 Recesses 21 Control unit 22 Fastening means 23 Retaining ring 24 Clamp 25 Guide section 26 Bracket 27 Recess R Relative movement K3 Guide or wedge surface on holding element K4 Guide or wedge surface on fastening device L Longitudinal axis M Clamping surface
    Zi loose state Z2 wedged state D Diameter of the clamping surface
    Di Inner diameter in loose state D2 Inside diameter in wedged state F Guide surface Q Transverse plane α Angle of guide surface ß Angle of guide or wedge surfaces B Broad side S Narrow side
    Db maximum diameter broadside
    Ds maximum diameter narrow side
    Pi Retainer Production Mode P2 Dental Workpiece Production Mode N Data U Sheath H Clamping surfaces G Bracket abutment surfaces
    Ah Minimum distance of the clamping surfaces
    Aq distance of the clamp counter surfaces
    权利要求:
    Claims (31)
    [1]
    1. Holding device (1) for a, in particular dental, workpiece (2), with a holding element (3) and a fastening device (4), wherein the workpiece (2) by a relative movement (R) of the fastening device (4) to the holding element (3 ) is attachable to the holding device (1), characterized in that the fastening device (4) or the holding element (3) has a slotted sleeve, wherein the inner surface of the slotted socket forms a clamping surface (M) for the workpiece (2) and wherein during the relative movement (R) of the fastening device (4) to the holding element (3), the workpiece (2) via the clamping surface (M) on the holding device (1) is clamped.
    [2]
    2. Holding device according to claim 1, characterized in that the slotted sleeve about a longitudinal axis (L) is formed partially annularly with a, preferably axially aligned slot (5).
    [3]
    A holding device according to claim 2, characterized in that the clamping surface (M) of the slotted bushing is engageable with the workpiece (2) and the clamping surface (M) has a first inner diameter (Di) corresponding to a loose state (Zi) of the slotted bushing the relative movement (R) of the fastening device (4) to the retaining element (3) can be reduced while narrowing the slot (5), the clamping surface (M) to a second, corresponding to a strained state (Z2) of the slotted sleeve inner diameter (D2).
    [4]
    4. Holding device according to one of claims 1 to 3, characterized in that the holding element (3) and the fastening device (4) miteinanderkorrespondierende guide or wedge surfaces (K3, K4), whereby by the relative movement (R) of the fastening device (4) to the holding element (3) via the abutting guide or wedge surfaces (K3, K4), the fastening device (4) on the holding element (3) attachable, preferably wedged, is.
    [5]
    Holding device according to one of claims 1 to 4, characterized in that the slotted bushing is formed separately from the retaining element (3) as part of the fastening device (4).
    [6]
    6. Holding device according to claim 4 or 5, characterized in that the guide or wedge surfaces (K3, K4) are at least partially conical.
    [7]
    7. Holding device according to claim 6, characterized in that the guide or wedge surface (K3) of the holding element (3) by an at least partially conical inner surface of the holding element (3) is formed.
    [8]
    A holding device according to any one of claims 4 to 7, characterized in that the guide surface (K4) of the fixing device (4) is formed by an at least partly conical outer surface of the fixing device (4).
    [9]
    9. Holding device according to one of claims 1 to 8, characterized in that in the holding element (3) at least one, preferably at least partially threaded, guide (6) is formed and that the fastening device (4) at least one in the guide (6) engaging nose (7 ), wherein by rotation of the fastening device (4) in the guide (6) engaging nose (7) the guide or wedge surfaces (K3, K ^ the fastening device (4) and the holding element (3) to each other in the axial direction move and wedge.
    [10]
    10. Holding device according to claim 9, characterized in that the guide (6) has a guide surface (F) which is perpendicular to the longitudinal axis (L) aligned transverse plane (Q), preferably at an angle (a) of 2 ° to 15 °, is inclined.
    [11]
    11. Holding device according to claim 10, characterized in that the guide or wedge surface (K3) of the holding element (3) defines a recess (8) in the holding element (3) and the recess (8) has a broad side (B) and a narrow side (S ), wherein the maximum diameter (Db) of the recess (8) on the broad side (B) is greater than the maximum diameter (Ds) of the recess (8) on the narrow side (S), wherein the guide surface (F) towards the narrow side (S) is inclined.
    [12]
    12. Holding device according to claim 11, characterized in that the guide (6) in the region of the narrow side (S) of the recess (8) in the holding element (3) is formed.
    [13]
    13. Holding device according to one of claims 9 to 12, characterized in that in the holding element (3) at least one axially aligned, the inner surface co-forming and with the at least one nose (7) corresponding groove (9) is formed.
    [14]
    Holding device according to Claim 13, characterized in that the fastening device (4) is guided on the retaining element (3) via the lug (7) engaging in the groove (9), whereby, during the relative movement (R), the fastening device (4) is guided along the groove (Fig. 9) is linearly axially movable.
    [15]
    Holding device according to claim 13 or 14, characterized in that the groove (9) and the guide (6) merge into one another.
    [16]
    Holding device according to claim 15, characterized in that the groove (9) and the guide (6) cooperate with the nose (7) of the fixing device (4) for relative movement (R) in the form of a bayonet-type fastening movement for the fixing device (4) on the holding element (3) pretend.
    [17]
    Holding device according to one of Claims 1 to 16, characterized by a tool (10) for carrying out the relative movement (R) of the fixing device (4) to the holding element (3).
    [18]
    A holding device according to claim 17, characterized in that the tool (10) comprises connecting elements (11) for positive engagement with the fastening device (4), whereby the fastening device (4) is at least rotatable relative to the retaining element (3) by the tool (10).
    [19]
    19. Holding device according to one of claims 1 to 4, characterized in that the slotted sleeve is formed integrally with the holding element (3).
    [20]
    A holding device according to claim 19, characterized in that the fixing device (4) comprises at least one clamp (24) with two spaced clamping surfaces (H) corresponding to the guide surface (K4) of the fixing device (4), the clamping surfaces (H) of the fastening device (4) in the region of the slot (5) of the clamping surface (M) facing away from each other, spaced apart clamping surfaces (G) - which the guide or Keilfläche (K3) of the holding element (3) correspond - can be applied.
    [21]
    Holding device according to Claim 20, characterized in that the mutually spaced clamping surfaces (H) have a minimum distance (Ah) from one another which is less than the distance (Aq) between the clamping surfaces (G) in the loose state (Z1) of the slotted sleeve.
    [22]
    22. A holding device according to claim 21, characterized in that the clamping surfaces (H) have a, preferably oblique, guide portion (25), wherein by the relative movement (R) of the clip (24) to the holding element (3) by the at the clamping mating surfaces (G) adjacent guide portion (25) the clip counter surfaces (G) are movable towards each other, so that the narrowing of the slot (5), the clamping surface (M) on the second, the strained state (Z2) of the slotted socket corresponding inner diameter (D2) can be reduced, in which the minimum distance (AH) The clamping surfaces (H) equal to each other again distance (Aq) between the bracket counter surfaces (G).
    [23]
    23. Holding device according to one of claims 20 to 22, characterized in that the fastening device (4) comprises a plurality of, preferably each other arranged, parentheses (24), wherein each bracket (24) each with a plurality of, in the holding element (3) formed slotted sleeve corresponds.
    [24]
    A holding device according to claim 23, characterized in that the fixing device (4) comprising a plurality of clamps (24) is integrally formed.
    [25]
    25. Set (12) with a holding device (1) according to one of claims 1 to 24 and at least one, preferably circular cylindrical, dental workpiece (2).
    [26]
    26. A processing machine (13), in particular a CNC machine, with a processing tool (14) and a holding device (1) according to one of claims 1 to 24 for a workpiece (2).
    [27]
    27. Processing machine according to claim 26, characterized in that the processing machine (13) has a movable, preferably cardan-like formed, positioning device (15), wherein the holding device (1) on the positioning device (15) is releasably attachable.
    [28]
    Method for producing a holding device (1) according to one of Claims 1 to 24 in a processing machine (13), in particular in a CNC machine, wherein in a holding device production mode (Pi) the processing machine (13) is clamped in the processing machine (13) Workpieces, the holding element (3) and the fastening device (4) of the holding device (1) producible, preferably beveled, are.
    [29]
    A method according to claim 28, characterized in that the holding device production mode (P 1) is based on data (N) of the holding element (3) and the fixing device (4) stored in a memory (16) and readable and executable by the processing machine (13) ) is carried out.
    [30]
    Machining machine (13), in particular a CNC machine, for carrying out a method according to claim 28 or 29, wherein in a memory (16) of the processing machine (13) the holding device production mode (Pi) for producing the holding device (1) is stored, wherein the holding device Production mode (Pi) is unlockable by entering a code.
    [31]
    A data carrier (17) on which the method according to claim 28 or 29 is stored in the form of data (N) readable by a processing machine (13) and executable as a holding device production mode (Pi) for manufacturing the holding device (1).
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    同族专利:
    公开号 | 公开日
    ES2703677T3|2019-03-12|
    EP3047818A1|2016-07-27|
    AT516263B1|2016-04-15|
    US10213841B2|2019-02-26|
    EP3047818B1|2018-09-26|
    US20160206410A1|2016-07-21|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA25/2015A|AT516263B1|2015-01-21|2015-01-21|Holding device for a dental workpiece|ATA25/2015A| AT516263B1|2015-01-21|2015-01-21|Holding device for a dental workpiece|
    EP16152024.2A| EP3047818B1|2015-01-21|2016-01-20|Holding device for a dental workpiece|
    US15/001,679| US10213841B2|2015-01-21|2016-01-20|Holding apparatus for a dental workpiece|
    ES16152024T| ES2703677T3|2015-01-21|2016-01-20|Retaining device for a dental piece|
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