巴西专利BR102014004481B1 wire cutting head for a brush cutter

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专利摘要:
Wire cutting head for a brush cutter. The invention relates to a wire cutting head (1) for a brushcutter with an elongated cutting wire (5) held tightly on a base body (2) of the wire cutting head (1) which protrudes outward through an opening of the wire (3) into the base body (2) and with the rotating wire cutting head (1) defining a cutting plane (12). a clamping device (8) is disposed on the base body (2) of the wire cutting head (1) for the cutting wire (5) which comprises a clamping body (10) movable about a pivot pin (16), wherein the pivot axis (26) of the pivot pin (16) is situated in a plane (13) approximately parallel to the cutting plane (12). the clamping body (10) is spring-loaded through a clamping spring (25) to a clamping position in which the cutting wire (5) is held between a clamping surface (28) and the clamping body (10). the clamping surface (28) and the swivel pin bearing (16) are made of a common component. In order to obtain a robust clamping device, to be easily assembled it is envisaged to make the component (17) as a U-shaped arch (19), and to arrange the clamping body (10) between the tabs (21, 22) of the bow (19). the pivot pin (16) of the clamping body (10) is supported at the ends of the arch flap (19), with the U-shaped arch (19) connecting the flaps (21, 22) to the web (20) ), the clamping surface (28) is made for the cutting wire.
公开号:BR102014004481B1
申请号:R102014004481-7
申请日:2014-02-26
公开日:2019-11-19
发明作者:Weimer Ina；Häberlein Jürgen；Keller Katharina；Neumaier Thomas；Stark Thomas
申请人:Stihl Ag & Co Kg Andreas；
IPC主号:

专利说明:

Descriptive Report of the Invention Patent for WIRE CUTTING HEAD FOR A MIXER.
[001] The invention relates to a wire cutting head for a brush cutter, with an elongated cutting wire, held tight in a base body of the wire cutting head, which the cutting wire projects out through of an opening of the thread in the base body and with the thread cutting head rotating defines a cutting plane, with a clamping device arranged in the base body of the thread cutting head, for the cutting thread, said device The clamping body comprises a movable clamping body around a rotating pin, the rotating pin rotating axis being located in a plane, approximately parallel to the cutting plane, and the clamping body is spring loaded through a clamping spring to a clamping position, in the clamping position of the clamping body the cutting edge is held between a clamping surface and the clamping body, and the clamping body acts on the cutting edge as such way that a centrifugal force acting on the cutting edge loads also the clamping body that is in the clamping position for its clamping direction, the clamping surface and the support of the rotating pin being made in a common component.
[002] EP 0 824 954 B1 discloses a wire cutting head, in which the cutting wire is held in the opening of the wire by means of a spring loaded clamping body. The clamping body can rotate around an axis of rotation that is parallel to the axis of rotation, the centrifugal force acting on the wire and the clamping body increasing the clamping through the clamping body.
[003] From EP 1 586 231 B1 a wire cutting head is known, in which the clamping body, the rotating pin of the clamping body and the outlet sleeve for the cutting wire are made as a common cylindrical component. The rotating pin is located in a plane, approximately parallel to the cutting plane of the cutting wire,
Petition 870190073042, of 07/30/2019, p. 5/32
2/20 and the clamping body is spring loaded through a clamping spring to a clamping position. In the clamping position of the clamping body, the cutting edge is held between a clamping surface, fixed on the housing, and the clamping body, and a centrifugal force acting on the cutting edge loads the clamping body, which is in the clamping position, for the clamping direction, so it reinforces the clamping. The clamping surface and the support of the rotating pin are made in the common cylindrical component, which can move in the base body of the wire cutting head around an axis parallel to the axis of rotation.
[004] The assembly of the clamping device is expensive, and the rotation support of the clamping device is susceptible to interference in the base body of the wire cutting head.
[005] The invention has the task of making a wire cutting head for a brushcutter of the generic type, with a clamping device such that, with simple assembly, a secure tightening of the cutting wire is also ensured through a long operation period.
[006] The task is solved by the fact that the component is a U-shaped arch and by the fact that the clamping body is located between the arch tabs, and is supported on the flap ends of the body's rotating pins of tightening, and in the core of the U-shaped arch connecting the flaps, the tightening surface is made for the cutting edge.
[007] The clamping body, the clamping spring and the rotating pin are made in a common component, which is designed as a U-shaped arch. The clamping body located between the flange of the arch, and the rotating pin is supported on the ends of the U-shaped arch flap. At the same time, on the U-shaped arch core, which connects the flap, the clamping surface for the cutting edge is formed,
Petition 870190073042, of 07/30/2019, p. 6/32
3/20 clamping device can be pre-assembled as an independent modular construction unit, and in the final assembly of the wire cutting head it needs to be simply inserted into a base body receiving bag made of synthetic material. With simple construction and simple assembly, a clamping head is created on a wire cutting head, which also ensures a reliable tightening of a cutting wire through a long period of operation, with all the clamping forces acting on it. on the clamping device during operation are received in the U-shaped arch.
[008] In a simple construction, the rotating pin is inserted radially into the slot at the ends of the flap, and is held by the clamping spring in its mounting position on the U-shaped arch. clamping spring is performed as a flap spring or spiral spring on the turning axis, the first flap of which fits into the clamping body, and this flap is spring loaded, and its second flap is kept in a cavity of arc fitting, formed at the end of the flap. This fitting cavity is suitably formed on the front side of the free end of the arc flap. To fix the rotating pin, a spring end of the clamping spring must be lifted simply to the free front side of the flap end. During the insertion of the rotating pin in the slits of the U-shaped arch, the end of the flap on the front side is displaced, until it retracts into the slot in the front side. In this way, the rotating pin is held in the captive arc, through the end of the locked tab of the clamping spring.
[009] In order to limit the possible rotational movement of the clamping body under spring force, a backrest is made on the arch, which is appropriately provided as a folding clamp molded on the flap. The clamping spring loads the clamping body in the direction of rotation for the backrest; without a cutting edge inserted, the clamping body touches under
Petition 870190073042, of 07/30/2019, p. 7/32
4/20 the effect of the clamping spring on the backrest. Advantageously, the clamping spring is a flap spring or a spiral spring, which together with the clamping body is maintained and supported on the rotating pin.
[0010] In a first example of carrying out the invention, the clamping spring is arranged between the tabs of the arc. With that it is protected between the flaps. A simple arrangement is provided if the clamping body is located eccentrically between the flaps, in such a way that, on one side of the clamping body, sufficient construction space is available for a clamping spring. In the volume of the free space formed between the clamping body and an arc flap, a filling body is advantageously inserted in order to react against a deviation of the cutting edge in that free space. This can avoid distracting insertion of the cutting edge into the free space of the U-shaped arch.
[0011] In a simple embodiment, a wall element of the base body provided in the base body of the wire cutting head protrudes into the U-shaped arch of the clamping device, due to the fact that, precisely this free space between the clamping body and the flap is at least partially covered. In this way, a deviation of the cutting wire to be inserted in the clamping device is avoided in the free space of the arc.
[0012] In preferred execution, in the free space between the clamping body and an arc flap, an insertion part can also be maintained, in particular, which fills the space, the insertion part being designed corresponding to the requirements, and completely or partially fills the volume of the free space. Advantageously, the insertion part is a molded part made of three-dimensional sheet metal, which is preferably traversed by the rotating pin, and can be fixed to the arch, in particular, with torsional security. Torsion safety is properly performed as a flange of
Petition 870190073042, of 07/30/2019, p. 8/32
5/20 security curved by the insertion part, which fits, preferably, in the slot of the arch flap, which receives the rotating pin. [0013] The insertion part is shaped in such a way that, within the free space it abuts with a first almost flat section on the arch flap, and with a second section it is closely adjacent to the clamping body. The second section, carried out properly in an almost flat manner, has so much lateral gap of the clamping body that this unimpeded body can freely rotate around its axis of rotation through the insertion part.
[0014] In order to minimize free space within the arc, or to prevent it entirely, in a second embodiment of the invention it is provided that, with a final section, the rotating pin protrudes outward through an arc flap, being whereas, the clamping spring is arranged in the final section outside the arc. The arc flaps have on both sides of the clamping body so much lateral gap of the clamping body that this flap can rotate freely without hindrance around its axis of rotation.
[0015] Easy insertion of the cutting wire into the clamping device is ensured if the arc clamping surface is located at a height with the lower corner of the wire opening; the opening of the thread is suitably formed by an outlet sleeve maintained on the peripheral wall of the base body. In order to hold the outlet sleeve against the centrifugal forces that act, it is envisaged that the outlet sleeve fits with an edge in a reception of the base body and thus in the radial direction of actuation of the centrifugal force - fits with the body with zipper due to shape.
[0016] Appropriately, on at least one side surface the clamping body is equipped with a drawdown in order to reduce the total weight of the clamping body and to move its center of gravity as close as possible to the axis of whirl. In this case, the downgrade is
Petition 870190073042, of 07/30/2019, p. 9/32
6/20 appropriately executed as a hole, in particular, as a continuous hole, the axis of the hole of which is preferably approximately parallel to the rotating pin.
[0017] The U-shaped arch of the clamping device receives all the clamping forces and spring forces, such that the base body around the clamping device is largely mechanically discharged. Suitably, the arc is made of metal, and is curved, in particular, of a metal strip.
[0018] Other characteristics of the invention result from the other claims, the description and the drawing, in which the following are represented examples of carrying out the invention described in detail. They are shown:
[0019] In figure 1 - a perspective view of the base body of a wire cutting head, [0020] in figure 2 - a view of the base body of the wire cutting head, according to the figure 1, with the upper part removed, [0021] in figure 3 - a cut through the base body, along line III-III in figure 2, [0022] in figure 4 - a cut through the base body, at the along line IV-IV in figure 3, [0023] in figure 5 - a perspective view of a clamping device to be inserted into the base body, [0024] in figure 6 - a view of the rear clamping device , [0025] in figure 7 - a section through the clamping device along line VII-VII in figure 6, [0026] in figure 8 - a side view of the clamping device according to figure 5, [0027 ] in figure 9 - a cut along the line IX-IX in figure 8, [0028] in figure 10 - another example of execution of a wire cutting head, in a representation corresponding to figure 2,
Petition 870190073042, of 07/30/2019, p. 10/32
7/20 [0029] in figure 11 - a cut through the wire cutting head along line XI-XI in figure 10, [0030] in figure 12 - a cutting through the base body of the wire cutting head , along line XII-XII in figure 11, [0031] in figure 13 - a perspective view of another example of making a clamping device, [0032] in figure 14 - a view of the clamping device according to figure 13 from the rear, [0033] in figure 15 - a section through the clamping device according to figure 13, along line XV-XV in figure 14, [0034] in figure 16 - a side view on the clamping device according to figure 13, [0035] in figure 17 - a section along line XVII-XVII in figure
6, [0036] in figure 18 - a perspective view on an outlet sleeve to be inserted into the base body of the wire cutting head, according to figures 2 to 4, [0037] in figure 19 - a position of the outlet sleeve according to figure 18 in schematic representation in relation to a clamping device, [0038] in figure 20 - a section through the arrangement according to figure 19, [0039] in figure 21 - another cut through the arrangement according to figure 19, [0040] in figure 22 - a third example of execution of the base body of a wire cutting head in a view according to figure 2, [0041] in figure 23 - a cut along line XXIII-XXIII in the figure
22, [0042] in figure 24 - a perspective view of an outlet sleeve
Petition 870190073042, of 07/30/2019, p. 11/32
8/20 inserted in the base body, according to figures 22 and 23, [0043] in figure 25 - a top view over the outlet sleeve according to figure 22, [0044] in figure 26 - a section through the outlet sleeve, along line XXVI-XXVI in figure 25, [0045] in figure 27 - a perspective view of a third example of execution of a clamping device, according to the invention, [0046] figure 28 - a view of the clamping device according to figure 27 from the rear, [0047] in figure 29 - a section through the clamping device according to figure 27, along the line XXIX-XXIX in figure 28 , [0048] in figure 30 - a side view of the clamping device according to figure 27, [0049] in figure 31 - a section through the clamping device along line XXXI-XXXI in figure 30, [0050 ] in figure 32 - a perspective view of a fourth example of making a clamping device according to the invention, with a filling element then, [0051] in figure 33 - another perspective view of the clamping device according to figure 32, [0052] in figure 34 - a view of the clamping device according to figure 32 from the rear, [0053 ] in figure 35 - a section through the clamping device along line XXXV-XXXV in figure 34, [0054] in figure 36 - a side view of the clamping device according to figure 32, [0055] in figure 37 - a cut through the clamping device along line XXXVII-XXXVII in figure 36, [0056] in figure 38 - a perspective view on the
Petition 870190073042, of 07/30/2019, p. 12/32
9/20 filling of the clamping device according to figure 32, [0057] in figure 39 - a view over the filling element from the front, [0058] in figure 40 - a side view of the filling element.
[0059] In the execution examples shown, wire cutter heads 1 are shown for brush cutters, which are equipped with cutter wires 5 (figure 2). As shown in figure 1, a wire cutting head consists of a base body 2, in essence, of symmetrical rotation, in whose peripheral wall 37 at least two openings of wire 3 are provided, which are diametrically opposed, suitably with respect to the axis of rotation 4 of the wire cutting head 1.
[0060] The base body 2 consists of an upper part 2a, and a lower part 2b, which are connected together by means of fixing screws 6, and form the base body 2. If the upper part 2a is released, a view over the lower part 2b, as shown in figure 2, results. In the example of execution according to figures 2 to 4, the lower part 2b has two openings of the wire 3 , which are diametrically opposite to each other, in relation to the axis of rotation 4. Other arrangements may also be appropriate, such as, for example, three wire openings, which are offset with respect to each other around 120 ° in the direction of rotation. Four or six wire openings can also be provided, with clamping devices 8 arranged at the rear. Each opening of the wire 3 is advantageously formed by an outlet sleeve 7, which is kept fixed in the base body 2, that is, in the lower part 2b. An outlet sleeve 7 is suitably located directly before a clamping device 8 for the cutting edge 5, which is stretched almost radially with the cutting head rotating. If the cutting edge hits an obstacle, a folded position results, as shown by the cutting edge 5 '.
Petition 870190073042, of 07/30/2019, p. 13/32
10/20 [0061] The bottom part 2b of the base body 2 has an annular shape, with a free center 9. The cutting edge 5 is inserted radially from the outside through the outlet sleeve 7 in the clamping device 8, until an inner end 5b of the cutting wire 5 protrudes inward into the free center 9. If the end of the effective cutting wire protruding through the peripheral wall 37 wears out or breaks that end of the wire in the opening of the wire 3, then the cutting edge 5 can be removed from the clamping device 8 by pulling on its inner end 5b.
[0062] As shown in figure 3, the clamping device 8 has a clamping body 10, which can rotate around a pivot pin 16. The pivot axis 26 of the pivot pin 16 is located on a plane 13, which is approximately parallel to a cutting plane 12 of the cutting threads 5, which results in the rotation of the base body 2 of the thread cutting head 1 about the axis of rotation 4. By means of the clamping body 10, the thread cutting edge 5 is kept tight on the base body 2, the radial centrifugal forces F acting on the cutting threads 5 in the longitudinal direction pushing the clamping body 10 that grips the cutting edge to the clamping position, therefore, the tightening of the cutting edge 5 during the operation of the cutting head 1 is self-reinforcing.
[0063] According to the invention, the clamping device 8 forms an independent modular construction unit 18, which can be pre-assembled simply with few manipulations. The pre-assembled building unit is inserted into a socket 14 of the base body 2, in the example of execution it is pushed into the socket 14 at the bottom 2b, so that the clamping device 8 is kept secure and - after the installation of the upper part 2a -also captive at reception 14.
[0064] The clamping device 8 used in the execution example according to figures 2 to 4 is reproduced enlarged
Petition 870190073042, of 07/30/2019, p. 14/32
11/20 in figures 5 to 9.
[0065] In a first embodiment, the clamping device consists, in essence, of the clamping body 10, a clamping spring 25 and the rotating pin 16 that serves as a support, which are held together in a component 17 .
[0066] In the execution example shown, component 17 is a U-shaped arch 19, which is essentially symmetrical to a central plane - compare with figure 6. Arch 19 consists of two flaps 21 and 22 , which are parallel to each other, and are connected at one end via a web 20. It can be advantageous to reinforce the U-shaped arch, also in the area of its open end by means of a web 90 (dashed representation) , which connects the free ends of the flaps 21, 22 with each other. With the U-shaped arch a base component is designated, which is important for the shape of the invention; that base component can be completed, for example, it can be closed by a web 90, or it can also be formed from a closed profile that contains the base component.
[0067] In the execution example, the flaps 21 and 22 are perpendicular to the plane of the web 20. In the area of the free ends of the flaps 21 and 22, slots 23 are provided at the same height, which are opened to a longitudinal edge 24 of the flaps 21 and 22. The longitudinal edges 24 are located on the rear side 50 (figure 8) of the clamping device 8.
[0068] The pivot pin 16 is located with its final sections in the slots 23, in such a way that the pivot pin 16 is supported on the ends of the flap. The rotating pin 16 supports the clamping body 10, whereby the clamping body 10 can be maintained by rotating on the rotating pin 16. Appropriately, an execution in one piece of clamping body 10 and a rotating pin can also be provided. 16.
[0069] On a lateral surface of the clamping body 10 is
Petition 870190073042, of 07/30/2019, p. 15/32
12/20 a clamping spring 25 is located between that body and a flap 21 of the arc 19, which in the example shown is designed as a flap spring or spiral spring. A first tab 25a of the spiral spring grips behind the clamping body 10; the second flap 25b of the spiral spring is located in a groove 32 of the flap 21, the groove 32 being performed on the front side of the end of the free flap of the flap 21.
[0070] As shown in figure 7, the clamping body 10 is formed as a lever on an arm, which is supported on one end on the rotating pin 16, the other end of which grips by tightening on the cutting edge 5. The end of the lever that tightens is elliptically rounded, and is equipped with a toothing 27, which fits into the cutting wire 5, and keeps that wire tight between a clamping surface 28 on the arch 19 and the clamping body 10. In the example shown, the clamping surface 28 is carried out on the web 20 of the U-shaped arch 19 connecting the flaps 21 and 22.
[0071] The clamping spring 25 is arranged in such a way that it loads the clamping body 10 into the clamping position shown in figure 7. The spring force thus acts in the direction of rotation 29. In order to limit the turning path of the side of the clamping body 10 in the direction of rotation 29, in the arch 19 a backrest 34 is formed. The backrest 34 is suitably formed by a folding clamp 35, which is molded into one part in arc 19, and is curved in the turning path of the clamping body 10.
[0072] As shown in figures 6 and 9, the clamping body 10 is located eccentrically between the flaps 21 and 22 of the U-shaped arch 19. This position is conditioned by the clamping spring 25, mounted on the rotating pin 16. A in order to ensure that, during insertion of a cutting edge 5 it will be securely between the clamping body 10 and the clamping surface 28, the base body 2 of the cutting head is
Petition 870190073042, of 07/30/2019, p. 16/32
13/20 a wall element 30 is provided, which covers the free space 70 conditioned by the clamping spring 25, between the clamping element 10 and the flap 21. As shown in particular in Figure 6, the wall element 30 protrudes into the contour of the arch 19. In order to obtain an appropriate position for the wall element 30, in the arch 19 a notch 31 is provided for the wall element 30. Appropriately, for this, the width b of a flap 21 through a part of its length is executed smaller than the width B of the other flap 22. The notch 31 created in this way in the flap area 21 is closed by the projecting wall element 30 (figure 6), being that , the wall member 30 projects to the side surface of the clamping member
10.
[0073] The rotating pin 16, which is inserted radially into the slots 23 at the ends of the flap, is secured in its mounting position on the arch 19 by means of the clamping spring 25. For the clamping element 10 to assume a defined exit position on the front side 40 of the clamping device 8, the backrest 34 is provided for limiting the rotation movement of the clamping body 10 in the direction of rotation 29. The backrest is made as a folding tab 35 of the flap 21, in which the clamping body 10 slope under actuation of the clamping spring 25.
[0074] As shown in figure 3, the clamping surface 28 is situated at a height with the bottom corner 36 of the opening of the wire 3. Appropriately, the opening of the wire 3 is formed by an outlet sleeve 7 maintained on the wall peripheral 37 (figure 2) of the base body 2.
[0075] The outlet sleeve 7 has an edge 38, with which it fits into a receiving 39 of the base body 2. Suitably, the outlet sleeve 7 covers a peripheral edge 41 of the base body 2 or the bottom part 2b of the base body 2 (figure 3).
[0076] As shown in figures 7 and 9, the clamping body 10
Petition 870190073042, of 07/30/2019, p. 17/32
14/20 has a recess 42 on at least one side surface, whereby the weight of the clamping body 10 is reduced and the center of gravity of the clamping body is close to the turning axis 26. In this way the influence on the clamping body 10 of the centrifugal forces that arise can be reduced, that is, the clamping forces acting additionally on the cutting edge, due to the centrifugal force of the clamping body 10 in the form of a lock can be reduced, such that the maximum tightening load of the cutting wire is reduced and is defined to a large extent only by the tightening spring 25. Appropriately, the recess 42 is performed as a hole 43, in particular as a continuous hole 43, whose axis of the hole 44 is located approximately parallel to the axis of rotation 26 of the pivot pin 16.
[0077] The U-shaped arch 19 is made, in particular, of metal, and is curved, in particular, from a strip of metal. In this case, the free ends of the flaps 21 and 22 can be curved and can overlap, one over the other, such that a web 90 is formed that closes the opening of the U (dashed representation), which increases the stiffness component.
[0078] In the example of execution according to figures 10 to
12, the wire cutting head corresponds in the basic assembly to the head according to figures 2 to 4, which is why for equal parts equal reference numbers are used.
[0079] As can be seen from the representation according to figure 12, the U-shaped arch 19 'of the clamping device 8 is executed asymmetrical with respect to its central plane. Figures 13 to 17 show the clamping device 8 with an arch 19 designed asymmetrical, which, however, in the basic assembly, except for the shape of the arch 19 corresponds to the clamping device 8 according to figures 5 to 9 , which is why the same reference numbers are used for equal parts.
Petition 870190073042, of 07/30/2019, p. 18/32
15/20 [0080] In turn, the U-shaped arch 19 'consists of two flaps 21 and 22 passing parallel to each other, however, flap 21 is made shorter than flap 22 The web 20 connecting the flaps 21 and 22 to each other is made rounded, in such a way that, below the clamping element 10, an arc section 51 is located, in essence, symmetrical. It may also be advantageous to connect the ends of the flaps 21, 22 to each other through a reinforcement web. Between the arc section 51 and the clamping body 10, then, a clamping space 52 results, in which the cutting edge 5 must be inserted for clamping. During a radial insertion of the cutting wire 5 into the opening of the wire 3, conditioned by the rounded web 20, the cutting wire 5 is forced to be in the area of the arc section 51 and, thus, is positioned securely below the clamping body 10. By means of the rounded web 20 with the arc section 51 in the form of a partial circle, it is ensured that the thread cannot deviate into the free space conditioned by the clamping spring 25 between the flap 21 and the clamping body
10. The rounded web 20 connects the shortest flap 21 with the longest flap 22, with the free ends of the flaps 21 and 22 being at approximately the same height. The rounded web 20 narrows the free space between the clamping body 10 and the flap 21, in such a way that a false position of a cutting wire 5 to be clamped is avoided. A type of rib is formed in the soul 20.
[0081] It may be appropriate to execute the U-shaped arch 19 'in such a way that the free space is filled by a step 19' ', which is preferably executed in one piece with the arch 19'. The arch 19 'can be shaped, in particular, by forming the step 19' '.
[0082] In figure 18 an outlet glove 7 is shown, like the one used in the execution example according to figures 2 to 4. The outlet glove 7 has a funnel-shaped outlet opening 45, the which during operation enables wire support
Petition 870190073042, of 07/30/2019, p. 19/32
16/20 of cut 5 in the area of the opening of the thread 3. The outlet sleeve 7 has an edge 46, into which a peripheral edge 41 (figure 3) of the base body 2 of the thread cutting head 1 fits.
[0083] As shown in figures 19 and 20, the alignment of the outlet sleeve 7 in relation to the clamping device 8 is provided in such a way that one of the flaps 22 of the U-shaped arch 19 is approximately in alignment with the wall side of the outlet sleeve 7 (figure 20). As shown in figure 19, the outlet sleeve 7 is secured by completing in its position on the base body 2 through the backrest 34 of the arc 19. The cutting edge receding under load is against the wall of the outlet sleeve 7, as shown the representation of the cutting wire 5 '; in the case of the reverse direction of rotation, the cutting edge is against the wall of the outlet sleeve 7, corresponding to the dashed representation.
[0084] From the longitudinal cut according to figure 21 it becomes evident that the clamping surface 28 of the web 20 and the inner surface 49 of the outlet sleeve 7 are situated in a plane, such that a cutting wire 5 inserted into the outlet sleeve 7 through the opening of the thread 3, can be inserted without resistance between the clamping surface 28 of the U-shaped arch 19 and the clamping body 10.
[0085] In the example of execution according to figures 22 and 23, a base body of a wire cutting head is shown in another execution, being that for equal parts equal reference numbers are used, as for the figures 2 to 4. In the case of this other embodiment, the clamping device 8 according to the invention acts in conjunction with a simple outlet sleeve 77. The outlet sleeve 77 is designed, in essence, cylindrical, and at one end of the opening of the thread 3 has an outlet cone 47, which supports a cutting thread in operation. At the end of the cylindrical outlet sleeve 77, opposite the outlet cone 47, an annular flange 57 is formed. The annular flange 57 - as shown in figure 23 - fits into a
Petition 870190073042, of 07/30/2019, p. 20/32
17/20 reception 39 in the base body 2, in such a way that the outlet sleeve 77 is secured against the effect of the centrifugal force F. The clamping device 8 used in the thread cutting head 1 according to figures 22 and 23 can be executed corresponding to figures 5 to 9 or corresponding to figures 13 to 17.
[0086] In figures 27 to 31, another example of execution of a clamping device 8 is shown, which corresponds in the basic assembly to the clamping device according to figures 5 to 9. Therefore, equal parts are designated with equal reference numbers. [0087] The U-shaped arch 19 of the clamping device 8 according to figures 27 to 31 has an internal width W, which corresponds to the width K of the clamping body 10 in the area of the rotating pin 16 (figures 27, 28). As a result, the clamping body 10 is, in essence, kept free of play between the flaps 21 of the arc 19, with the rotating pin 16 at one end projecting inward with a final section 15 through the flap 21 of the arc 19. The clamping spring 25 is slid over the final section 15 of the rotating pin 16 (figures 27, 28 and 31), with the first flap 25a of the clamping spring projecting through a recess 61 in the flap 21 between the flaps 21 and 22, and fits into a step 55 of the clamping body 10. The second flap 25b of the clamping spring 25, performed as a spiral spring, as described above, is located in a groove 32 on the front side 33 tab 21.
[0088] The difference in the form of execution according to the figures and 31 therefore consists, in essence, in the fact that the clamping body 10 is in the center between the flaps 21 and 22 of the arch 19, and the spring clamp 25 is supported outside the arc 19, in a final section 15 of the rotating pin 16, which protrudes out of the flap 21. This becomes clear, in particular, from the sectional representation in figure 31.
[0089] In a next example of execution according to figures 32 to 37 - as in the example of execution according to figures
Petition 870190073042, of 07/30/2019, p. 21/32
18/20 figures 5 to 9 - the clamping body 10 is located eccentrically between the flaps 21 and 22 of the U-shaped arch 19. The equal parts are designated with equal reference numbers.
[0090] The free space 70 conditioned by the clamping spring 25, between the clamping element 10 and the flap 21 of the arch 19, in the example of execution according to figures 5 to 9, is at least partially covered by the element wall 30 provided in the base body 2 of the wire cutting head 1, so that a cutting wire to be inserted in the clamping device 8 cannot deviate to the free space 70 of the arc 19. In the example of execution according to figures 31 to 35, the free space 70 between the clamping element 10 and the flap 21 of the arc 19 is at least partially filled with an insertion part 60. As shown in particular in figures 32, 34 and 37, the insertion part 60 has a first section 62, which has an opening 63 (figures 38, 40), which is traversed by the rotating pin 16. The first section 62 of the the insertion part touches almost extensively on one of the flaps 21 of the arc 19, and the clamping spring 25, which is maintained on the rotating pin 16 as a spiral spring, is positioned between the section 62 of the insertion part 60 and the body tightening torque 10.
[0091] As a result, in particular, also of the detailed representations of the insertion part 60 according to figures 38 to 40, the insertion part is made, in particular, three-dimensional, and is preferably constituted of a molded sheet part. A second section 64 is connected to the first section 62 via a corrugation section 65, which is preferably flat. The first section 62 - executed, preferably flat - is located on a plane 72 (figure 39), which is parallel to the plane 74, in which the second section 64 extends. The planes 72 and 74 have an interval and vertical between si, which corresponds approximately to the inner diameter L (figure 34) of the free space 70. The second section 64 extends, in essence,
Petition 870190073042, of 07/30/2019, p. 22/32
19/20 across the height of the clamping body 10, and is adjacent to that body, the flat executed section having so much lateral gap in relation to the clamping body 10, such that the clamping body can rotate freely around its turning axis 26, without impediment through the insertion part 60.
[0092] The flat section 64 that is adjacent to the clamping body 10 fits with an extension 66 in a recess 67 of the web 20, through which the flat section 64 is fixed in its position in relation to the clamping body 10. The extension 66 abuts a restraining surface 68 of recess 67, and defines the gap f between the clamping body and the flat section 64. The gap f is chosen in such a way that the clamping body 10 can rotate slightly about its turning axis 26 without hindrance through the insertion part 60.
[0093] In addition, the insertion part 60 is equipped with a torsion guard 59, which fits into a flap 21 of the arc 19. [0094] In the execution example, the torsion guard 59 is performed as a safety flange 69 curved of the insertion part 60. The safety flange 69 fits into the arc 19, and fixes the insertion part around the axis of rotation 26 of the rotating pin 16. In the example shown, the safety flange 69 fits into the slot 23 of the flap 21 of the arch 19, preferably with little clearance, or without clearance.
[0095] The insertion part 60 inserted in the free space 70 that fills the free space 70, at least partially, is designed, therefore, as insertion part 60 of space filling.
[0096] In the front corner area 71, the insertion part 60 is folded through a height H in the direction towards the free space 70, such that a cutting edge to be introduced from the front side 40 through the folded section 73 it is deflected towards the clamping body 10 according to the type of a deflector.
Petition 870190073042, of 07/30/2019, p. 23/32
20/20 [0097] The insertion part 60 can be manufactured as a molded part of sheet, stamped part or similar, and the position of the insertion part 60 in the U-shaped arch is fixed through the extension 66, which is in the recess 67 of the web, the safety flange 69 and the rotating pin 16 that passes through the opening 63.

权利要求:
Claims (20)
[1]
1. Wire cutting head for a brush cutter, with an elongated cutting wire (5), held tight on a base body (2) of the wire cutting head (1), that the cutting wire (5) is it projects out through an opening of the thread (3) in the base body (2) and with the thread cutting head (1) rotating it defines a cutting plane (12), with a clamping device (8) arranged in the base body (2) of the wire cutting head (1), for the cutting wire (5), said clamping device (8) comprises a clamping body (10) movable around a rotating pin (16 ), and the turning axis (26) of the rotating pin (16) is located on a plane (13), approximately parallel to the cutting plane (12), and the clamping body (10) is spring loaded through of a clamping spring (25) to a clamping position, and in the clamping position of the clamping body (10) the cutting edge (5) is held between a clamping surface (28) and the clamping body (10), and the clamping body (10) acts on the cutting wire (5) in such a way that a centrifugal force (F) acting on the cutting wire (5) also loads the clamping body (10) that is in the clamping position for its clamping direction, clamping surface (28) and the support of the rotating pin (16) are made in a common component (17), characterized by the fact that the component (17) is a U-shaped arch (19), by the fact that that the clamping body (10) is located between the flaps (21, 22) of the arc (19), and is supported on the flap ends of the rotating pins (16) of the clamping body (10), core (20) of the U-shaped arch (19) connecting the flaps (21,22), the clamping surface (28) is made for the cutting edge (5).
[2]
2. Wire cutting head according to claim 1, characterized in that the rotating pin (16) is inserted radially in the slot (23) of the flap ends, and is secured by the clamping spring (25) in its mounting position on the arc (19).
Petition 870190073042, of 07/30/2019, p. 25/32
2/4
[3]
3. Wire cutting head according to claim 1, characterized in that the clamping spring (25) is a flap spring that is over the rotating pin (16), the first flap of which (25a) fits in the clamping body (10), and whose second flap (25b) is held in a groove (32) of the arch (19), made at the end of the flap.
[4]
4. Wire cutting head according to claim 3, characterized in that the fitting cavity (32) is made on the front side (33) of the free end of the flap (21) of the arc (19).
[5]
5. Wire cutting head according to claim 1, characterized by the fact that, in the arch (19) a backrest (34) is provided for limiting the rotation movement of the clamping body (10), the backrest (34) can be made as a folding clip (35) molded on the flap (21).
[6]
Thread cutting head according to claim 3, characterized in that the clamping spring (25) is arranged between the flaps (21, 22) of the bow (19).
[7]
Thread cutting head according to claim 6, characterized in that the clamping body (10) is located eccentrically between the flaps (21, 22).
[8]
Wire cutting head according to claim 7, characterized in that a wall element (30) of the base body (2) provided in the base body (2) of the wire cutting head (1 ) protrudes into the U-shaped arch (19) of the clamping device (8).
[9]
Wire cutting head according to claim 7, characterized in that, in a free space (70) between the clamping body (10) and a flap (21, 22) of the arc (19) is maintained an insertion part (60) that fills the space.
[10]
10. Wire cutting head according to claim 9,
Petition 870190073042, of 07/30/2019, p. 26/32
3/4 characterized by the fact that the insertion part (60) is a molded part of three-dimensional sheet, which is traversed by the rotating pin (16), and is fixed on the arch (19) with a torsion security (59) .
[11]
11. Wire cutting head according to claim 10, characterized in that the torsion safety (59) is performed as a safety flange (69) curved by the insertion part (60), which fits into the slot (23) of the flap (21,22) of the arc (19).
[12]
Wire cutting head according to claim 9, characterized in that the insertion part (60) abuts with a first section (62) extensively in a flap (21) of the arch (19), and with a second section (64) is closely adjacent to the clamping body (10).
[13]
13. Wire cutting head according to claim 3, characterized in that the rotating pin (16) has a final section (15), which protrudes outward through a flap (21, 22) of the arc (19), and the clamping spring (25) is arranged in the final section (15) outside the arch (19).
[14]
Thread cutting head according to claim 1, characterized in that the clamping surface (28) of the arc (19) is situated at a height with the lower corner of the thread opening (3).
[15]
15. Wire cutting head according to claim 1, characterized in that the opening of the wire (3) is formed by an outlet sleeve (7) maintained on a peripheral wall (37) of the base body ( 2).
[16]
16. Wire cutting head according to claim 15, characterized in that the outlet sleeve (7) fits with an edge (38) in a receiving (39) in the base body (2).
[17]
17. Wire cutting head according to claim 1, characterized by the fact that, on at least one side surface, the clamping body (10) has a lowering (42) which reduces the
Petition 870190073042, of 07/30/2019, p. 27/32
4/4 weight.
[18]
18. Wire cutting head according to claim 17, characterized in that the lowering (42) is performed as a hole (43).
[19]
19. Wire cutting head according to claim 18, characterized in that the hole (43) is a continuous hole, whose axis of the hole (44) is located parallel to the rotating pin (16).
[20]
20. Wire cutting head according to claim 1, characterized in that the arc (19) is made of metal, and can be curved from a metal strip.

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同族专利:

公开号 | 公开日

BR102014004481A2|2015-12-01|

DE102013003856A1|2014-09-11|

US9320195B2|2016-04-26|

CN104137694B|2017-10-20|

US20140250699A1|2014-09-11|

RU2648053C2|2018-03-22|

EP2774468B1|2016-07-20|

CN104137694A|2014-11-12|

RU2014107352A|2015-09-10|

EP2774468A1|2014-09-10|

引用文献:

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FR2850238B1|2003-01-23|2005-10-21|Speed France|CUTTING HEAD FOR BRUSHCUTTER, CUTTER OR SIMILAR|

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FR2959151B1|2010-04-21|2012-04-13|Pellenc Sa|MULTIFUNCTION ROTATING CUTTING HEAD, FOR CUTTING APPARATUSES, AND PORTABLE EQUIPMENT PROVIDED WITH SUCH A CUTTING HEAD|FR2995500B1|2012-09-14|2014-08-29|Pellenc Sa|ROTARY CUTTING HEAD WITH THREADS AND ASSEMBLY COMPRISING SUCH A HEAD AND A DRIVING SHAFT OF SAID HEAD|

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DE102014006057A1|2014-04-26|2015-10-29|Andreas Stihl Ag & Co. Kg|Thread cutting head for a brush cutter|

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法律状态:
2015-12-01| B03A| Publication of an application: publication of a patent application or of a certificate of addition of invention|

2018-02-27| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

2019-06-04| B06T| Formal requirements before examination|

2019-10-01| B09A| Decision: intention to grant|

2019-11-19| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/02/2014, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/02/2014, OBSERVADAS AS CONDICOES LEGAIS |

优先权:

申请号 | 申请日 | 专利标题

DE102013003856.1A|DE102013003856A1|2013-03-06|2013-03-06|Thread cutting head for a brush cutter|

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