JP2008114298A - Chisel with flange for hydraulic breaker and flange member for chisel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chisel with a flange for a hydraulic breaker and a flange member for the chisel capable of being comparatively inexpensively and easily manufactured even when the flange part is made large in diameter. <P>SOLUTION: In the chisel 4 with the flange, a circular annular shape groove part 1 is provided on the part located outside from a front head 6, and a pair of large diameter parts 2 projecting in the radial direction is formed on both sides of the groove part 1. A circular annular shape flange member 7 formed from the elastic body is fitted in the groove part 1 by being elastically deformed by itself. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chisel with a hook that is used in a hydraulic breaker and has a hook on its outer peripheral surface.

  For example, as shown in FIG. 9, a hydraulic breaker used by being attached to a work vehicle operating in a tunnel supports the breaker body 10 with a bracket 20 and attaches the bracket 20 to an arm 40 of the work vehicle 50. ing. The breaker body 10 has a cylinder (not shown) at the center in the axial direction, and a back head is connected to the rear end side of the cylinder. A piston is slid into the cylinder to form a known hydraulic striking mechanism. By supplying pressure oil from the hydraulic supply source to the cylinder via the switching valve, the piston can move forward and backward. ing.

As shown in FIG. 10, the breaker body 10 has a front head 6 on the tip side thereof, and a chisel (rod) 130 that can reciprocate in the axial direction in the front head 6. Is inserted.
When performing a crushing operation in a tunnel with this type of hydraulic breaker, the chisel 130 is pressed against the object 70 to be crushed, and the rear end of the chisel 130 is hit with a piston built in the breaker body 10. Thereby, in the chisel 130, a compressive stress wave is generated that travels in the direction of the object 70 to be crushed by the impact of the piston, and the chisel 130 can be crushed by moving forward in the direction of the object 70 to be crushed. .

By the way, in this type of hydraulic breaker 30, for example, as shown in FIGS. 9 to 10, the chisel 130 uses a chisel with a hook provided with a hook portion 170 or the like at a portion located outside the front head. In this way, entry of earth and sand into the breaker body 10 is prevented.
However, in order to suitably prevent entry of earth and sand into the breaker body 10 particularly when topping, it is not sufficient that the collar portion has a small diameter.

  Therefore, for example, as illustrated in FIG. 11A, a large-diameter washer 172 is sandwiched between the small-diameter flange portion 171 on the breaker body side, or as illustrated in FIG. 11B, the flange 172 itself. The outer diameter is increased to prevent entry of earth and sand into the breaker body. For example, in the technique described in Patent Document 1, a chisel with a hook in which a relatively large-diameter ridge projecting outward is formed on the shaft portion of the chisel main body. It is preventing.

Further, for example, as illustrated in FIG. 11 (c), a large-diameter flange portion 173 made of steel is used as a separate member, and the flange portion 173 is fixed with a cooling fit, or as shown in the figure. Such a caulking member 174 can be used to further fix the large-diameter collar 173 by using caulking together.
Further, for example, in the technique described in Patent Document 2, as illustrated in FIG. 11D, a positioning protrusion 175 is provided on the shaft portion of the chisel body, and the split protrusion 175 is provided on the protrusion 175. A steel chisel 177 is inserted through a spacer 176, and the spacer 176 and the chisel 177 are welded and fixed to constitute a chisel with a chisel. This prevents entry of earth and sand into the breaker body, particularly when topping.
Japanese Utility Model Publication No. 05-88883 JP 2002-103247 A

However, for example, in a case where a large-diameter washer is sandwiched between the small-diameter collar portion and the breaker body, as illustrated in FIG. 11A, the interposed washer has insufficient durability, and There is a risk of working without the washer itself, and there is still room for consideration.
In addition, as in the technique described in Patent Document 1 illustrated in FIG. 11B, the one in which the outer diameter of the ridge is increased by integral formation is manufactured by cutting out from the maximum diameter or by forging. Therefore, the cost required for materials and processing is high.

  Further, for example, in the case of fixing a large-diameter ridge by cold fitting or caulking illustrated in FIG. 11A, the heel and the shaft portion of the chisel need to be polished to manage the fit. The manufacturing cost is high. In addition, the weight of the steel rod itself may require additional caulking members to prevent it from moving during operation, or it may be necessary to insert a locking pin. It is not sufficient to simply form it and fix it to the chisel body.

  In addition, as in the technique described in Patent Document 2 illustrated in FIG. 11D, the one in which the flange 177 is inserted through the spacer 176 and is welded to each other to be fixed to the chisel body has a long axial direction. , The entire buttocks become larger. In addition, as with the above-described cold fitting or caulking, it is difficult to attach and remove the bag, and it is more difficult to remove, making the manufacturing process complicated and costly.

  Accordingly, the present invention has been made paying attention to such problems, and even when the collar portion has a large diameter, the chisel with a flange for a hydraulic breaker that can be manufactured relatively inexpensively and easily. It is another object of the present invention to provide a chisel saddle member.

  In order to solve the above-mentioned problems, a first invention of the present invention is a chisel with a hook that is used in a hydraulic breaker and is inserted into the front head so as to be capable of reciprocating in the axial direction. A chisel member, and a chisel main body to which the chisel member is mounted. The chisel main body has an annular hook member mounting portion for mounting the hook member on a portion located outside the front head. And the flange member mounting portion and the flange member are circular surfaces in which either one has an annular recess and the other fits into the recess on the annular surfaces facing each other in the radial direction. The collar member is formed with an annular convex part, and the concave part or convex part of the collar member is attached to the convex part or concave part of the collar member mounting part by elastically deforming itself. It is characterized by being.

  According to the first invention, the chisel body mounting portion and the chisel member of the chisel body have an annular concave portion on one side and an annular convex portion that fits on the concave portion on the other side. In addition, since the saddle member can be easily attached to the saddle member mounting portion of the chisel body simply by fitting the concave portion and the convex portion to each other by elastic deformation of the saddle member, dimensional control between the concave portion and the convex portion is possible. Can take a wider allowable range than the above-described fitting between steel materials. Moreover, the cold fitting and caulking as illustrated above are unnecessary. Therefore, for example, even when the collar portion has a large diameter, it can be manufactured relatively inexpensively and easily.

  Here, since the conventional chisel illustrated above is made of steel in any of the examples, the mass of the entire chisel increases as the diameter increases. For this reason, for example, the load on the bush inside the hydraulic breaker increases and wear of the bush is also accelerated. In addition, it is difficult to attach and remove the scissors. Therefore, it is difficult to reuse the chisel body.

Therefore, a second invention of the present invention is a chisel with a flange for a hydraulic breaker according to the first invention, wherein the flange member is formed of an elastomer or an elastic body containing an elastomer. Yes.
According to the second invention, in addition to the action and effect of the chisel with a hook for a hydraulic breaker according to the first invention, the hook member is formed of an elastomer or an elastic body containing an elastomer. It can be reduced in weight compared to a steel saddle member. In addition, a sufficient tightening allowance can be easily ensured when fitting by the elastic deformation. For example, at the time of use, the eaves member according to the second invention can be easily assembled to the eaves member mounting portion of the chisel body by the thrust of the work machine. Therefore, the manufacture is easier, and the replacement of the eaves member is also easier.

Further, a third invention of the present invention is a chisel with a flange for a hydraulic breaker according to the first or second invention, wherein one of the recesses of the saddle member mounting portion and the saddle member and this The other convex part that fits in the above is that the annular surfaces facing each other in the radial direction are tapered surfaces that have a slope that decreases in diameter toward the proximal side in the axial direction. It is characterized by.
According to the third invention, in addition to the operation and effect of the chisel with a hook for a hydraulic breaker according to the first or second invention, the concave portion and the convex portion of the saddle member mounting portion and the saddle member are Since the annular surfaces facing each other in the radial direction are tapered surfaces having a slope that decreases in diameter toward the base end side in the axial direction, they are not easily detached after assembly. Therefore, the mounting state can be made more reliable.

  A fourth invention of the present invention is a chisel with a hook for a hydraulic breaker according to the third invention, wherein the hook member mounting portion is provided adjacent to the concave portion and both sides of the concave portion. A pair of large diameter portions extending in the radial direction, and at least a large diameter portion on the chisel base end side of the pair of large diameter portions is provided on the concave portion side in the axial direction. And a conical surface that is provided on the opposite side of the recess and decreases in diameter toward the opposite side, and the flange member is fitted into the recess of the flange member mounting portion. It has an annular convex part and a concave step part which is provided on the chisel base end side with respect to the convex part and fits into the large diameter part on the base end side.

According to the fourth invention, in addition to the operation and effect of the chisel with a flange for a hydraulic breaker according to the third invention, a pair of large-diameter portions provided adjacent to both sides of the recess and projecting in the radial direction are provided. Thus, the flange member assembled in the recess is further restrained from moving in the axial direction by the pair of large-diameter portions after assembly. Therefore, the mounting state can be made more reliable.
Further, the large diameter portion on the chisel base end side has a conical surface that is provided on the side opposite to the concave portion and decreases in diameter toward the opposite side, so the side on which this conical surface is formed By attaching the eaves member from the inner side, it is possible to smoothly expand the diameter along the slope, and the attachment can be made easier.

  Further, a fifth invention of the present invention is a chisel with a flange for a hydraulic breaker according to the third invention, wherein the flange member mounting portion includes the convex portion and a chisel base end side of the convex portion. A second convex portion having a diameter smaller than that of the convex portion, the second convex portion being a cylindrical portion provided on the convex portion side in the axial direction, A conical surface provided on a side opposite to the convex portion and having a diameter reduced toward the opposite side, and the flange member is fitted into the convex portion of the flange member mounting portion. And a concave step portion provided on the chisel base end side with respect to the concave portion and fitted to the second convex portion.

According to the fifth invention, in addition to the operation and effect of the chisel with a hook for a hydraulic breaker according to the third invention, the two concave portions of the chisel member are respectively fitted to the two large and small convex portions of the chisel body. Therefore, it is possible to make the wearing state more reliable.
Furthermore, since the second convex portion has a conical surface that is provided on the opposite side of the convex portion and decreases in diameter toward the opposite side, from the side on which the conical surface is formed. By mounting the heel member, it is possible to smoothly increase the diameter along the slope, and the mounting can be facilitated.

A sixth invention of the present invention is the chisel with a hook for a hydraulic breaker according to the fourth or fifth invention, wherein the hook member is disposed on the chisel base end side in the axial direction thereof. An annular extension extending toward the end side is provided, and the extension is directly fitted to the outer peripheral surface of the chisel body.
According to the sixth invention, in addition to the operation and effect of the chisel with a hook for a hydraulic breaker according to the fourth or fifth invention, the hook member has a chisel base end on the chisel base end side in the axial direction. Since it has an annular extension extending toward the side, and this extension is designed to fit directly onto the outer peripheral surface of the chisel body, for example, an external force that turns up the flange member in the axial direction. Even when this occurs, the strength of the ring is improved by the annular extension, and the extension is directly fitted to the outer peripheral surface of the chisel body to ensure a wide contact area. Therefore, falling off due to turning up (deformation) and turning up (deformation) can be prevented or suppressed.

  According to a seventh aspect of the present invention, there is provided a scissors member attached to a chisel with a scissors for a hydraulic breaker, wherein the scissors are attached to a chisel body having a scissors member attaching portion. The portion is formed in an annular shape having a convex portion or a concave portion at a portion located outside the front head of the hydraulic breaker, and the flange member is radially formed on the convex portion or the concave portion of the flange member mounting portion. On the opposite annular surface, there is an annular recess or projection that fits into the projection or recess, and the recess or projection of the flange member is elastically deformed by itself to deform the flange member mounting portion. It is characterized by being mounted on the convex portion or concave portion of the.

  According to the seventh invention, the flange member has a recess or a protrusion, and the recess or protrusion can be fitted into the protrusion or recess of the flange member mounting portion of the chisel body by elastic deformation of the flange member. Therefore, the hook member can be easily mounted on the hook member mounting portion of the chisel body. Therefore, for example, even when the collar portion has a large diameter, it is possible to provide a collar member that can easily produce a chisel with a collar relatively inexpensively.

  As described above, according to the present invention, it is possible to provide a chisel with a chisel for a hydraulic breaker and a chisel chisel member that can be manufactured relatively inexpensively and easily even when the collar has a large diameter. .

Embodiments of the present invention will be described below with reference to the drawings as appropriate.
FIG. 1 is a view for explaining a main part of a breaker main body of a hydraulic breaker according to the present invention, in which the front head portion is shown in a cross section including an axis. This hydraulic breaker is different from the above-described conventional hydraulic breaker 30 only in the chisel with a hook according to the present invention, and the other parts are the same, so detailed description of the other parts will be omitted.

  As shown in FIG. 1, the chisel 4 with a hook is inserted into the breaker body 10 from the front end side in the front head 6. Further, a substantially cylindrical front cap 12 is provided on the front end side of the inner peripheral surface of the front head 6. The hooked chisel 4 is held coaxially with a piston (not shown) by the front cap 12 and can be reciprocated by a predetermined distance in the axial direction by striking the piston.

Here, the chisel 4 with a hook is configured to include a chisel body (rod) 3 and a hook member 7.
The chisel body 3 has a groove portion 1 at a predetermined position (substantially central portion in the axial direction) outside the front head 6, and is stretched in an annular shape in the radial direction on both axial sides of the groove portion 1. It has a pair of large diameter portions 2 to be put out. An annular eaves member 7 protruding in the radial direction is fitted into the groove 1. The flange member 7 can be attached to and detached from the shaft portion of the chisel body 3, and the outer diameter thereof is a large diameter that is substantially the same as the outer diameter of the front end portion of the front cap 12.

  Hereinafter, the hooked chisel 4 will be described in more detail with reference to FIGS. 2 and 3. FIG. 2 is a view for explaining the chisel 4 with a hook, and FIG. 2A shows the hook member 7 in a cross section including its axis. 2B is a view of the chisel body 3 from which the flange member 7 is removed, FIG. 2C is a plan view of the flange member 7, and FIG. 3D is a longitudinal sectional view of the flange member 7. FIG. FIG. 3 is an enlarged view of a portion A in FIG.

  As shown in an enlarged view in FIG. 3, the flange member 7 has a short cylindrical portion 7a on the front head 6 side (base end side) on the outer peripheral surface thereof, and a cross section is formed on the distal end side of the cylindrical portion 7a. It has a conical surface 7b that is reduced in diameter toward the tip side. Furthermore, the inner peripheral surface has an annular concave step 7d on the front head 6 side (base end side), and the tip end side is inclined to reduce the diameter toward the base end side in the axial direction. The tapered surface 7c is formed as an annular convex portion. Here, the flange member 7 is formed of a reinforced rubber material.

  On the other hand, the chisel body 3 is formed with a groove portion 1 as a concentric and annular recess at the shaft portion, and the groove portion 1 has an outer peripheral surface 1c facing the radial direction on the proximal end side in the axial direction. The taper surface 1c has an inclination that decreases in diameter. The taper surface 1c of the groove portion 1 is a surface facing the taper surface 7c of the flange member 7, and the width dimension and taper angle in the axial direction are substantially the same. It should be noted that the radial dimension is smaller than the outer diameter dimension of the groove portion 1 so that the inner diameter dimension of the flange member 7 secures a fitting tightening allowance.

The chisel body 3 is formed with a pair of large diameter portions 2 on both sides of the groove portion 1. Each of the pair of large diameter portions 2 has a cylindrical portion 2a on the groove portion 1 side, and has a conical surface 2b on the side opposite to the groove portion 1 that decreases in diameter toward the opposite side. The width and the outer diameter of the cylindrical portion 2a are equal to the width and the inner diameter of the concave step portion 7d of the flange member 7.
As shown by a broken line in FIG. 2A, the flange member 7 is inserted from the proximal end side of the shaft portion of the chisel main body 3 and attached to the groove portion 1. That is, the tapered surface 7c of the flange member 7 is expanded in diameter by elastic deformation when the pressing force P is applied and abuts against the conical surface 2b of the large-diameter portion 2 on the proximal end side, and the groove portion 1 And is fitted from the axial direction.

  At this time, the tapered surface 7c can be smoothly expanded in diameter along the inclined surface of the conical surface 2b, thereby facilitating its mounting. Then, by being pushed to a predetermined position in the axial direction, the cylindrical portion 2a of the large-diameter portion 2 and the concave step portion 7d of the flange member 7 are engaged with each other, and the annular portions facing each other in the radial direction are engaged. When the taper surfaces 7c and 1c come into contact with each other, the movement in the axial direction is restricted, and the position is fixed. Here, in this embodiment, the said gutter member mounting part is comprised by the groove part 1 and a pair of large diameter part 2 of the both sides.

Next, the operation and effect of the chisel 4 with a hook will be described.
As described above, according to the hydraulic breaker equipped with the chisel 4 with the hook, since the large-diameter hook member 7 is attached to the chisel body 3, for example, as shown in FIG. When performing, it is possible to suitably prevent the entry of earth and sand into the breaker body 10 especially when topping.

  According to the hydraulic breaker equipped with the chisel 4 with the hook, the tapered surface 7c of the hook member 7 is configured to be fitted into the groove portion 1 of the chisel body 3 by elastic deformation. The hook member 7 can be easily mounted at a predetermined position of the chisel body 3 simply by fitting the tapered surface 7c. Moreover, since the fitting by elastic deformation is employ | adopted, the dimension management with the groove part 1 and the taper surface 7c of the eaves member 7 makes a tolerance | permissible_range wide compared with the fitting by steel materials as illustrated above. Can do. Therefore, manufacture is also easy.

  In addition, the conventional chisel with a hook illustrated above (see FIG. 11) has a steel hook made of steel in any of the examples, so that the mass of the entire chisel increases as the diameter increases. For this reason, for example, the load on the bush inside the hydraulic breaker increases and wear of the bush is also accelerated. In addition, it is difficult to attach and remove the scissors. Therefore, it is difficult to reuse the chisel body.

  However, according to the hydraulic breaker equipped with the chisel 4 with the chisel provided on the chisel body 3 with the chisel member 7, the chisel member 7 is made of a reinforced rubber material. In comparison, the weight can be reduced, the load on the bush inside the hydraulic breaker is reduced, and wear of the bush is suppressed. In addition, a sufficient tightening allowance can be ensured in the fitting by the elastic deformation.

  Further, according to the chisel 4 with the flange, the groove portion 1 and the flange member 7 are inclined such that the annular surfaces facing each other in the radial direction are reduced in diameter toward the proximal end side in the axial direction. Since it is a tapered surface 1c and a tapered surface 7c, it is easy after assembly even when an external force (indicated by reference numeral F in FIG. 3) is applied due to, for example, collision of earth and sand during operation or contact with the rock Never come off.

Further, according to the chisel 4 with the hook, the hook member 7 can be easily assembled to the groove portion 1 by the thrust of the work machine as shown in FIG. 5 by attaching the breaker body 10 to the work vehicle, for example. is there.
Specifically, as shown in FIG. 2A, first, the chisel body 3 is inserted into the front head 6, and the flange member 7 is interposed between the front cap 12 and the large-diameter portion 2 on the base end side. Is placed in a predetermined orientation. At this time, if the tip of the chisel body 3 is supported by the object to be crushed 70 as shown in FIG. Next, as shown in FIGS. 7B to 7C, the base large-diameter portion 2 is formed by pressing the breaker body 10 with the thrust P by the work machine and elastically deforming the tapered surface 7c of the flange member 7. Thus, the hooked chisel 4 can be configured by being fitted into the groove portion 1 of the chisel body 3. In this mounting operation, as shown in FIGS. 2C and 2D, a pair of spacers 60 divided into two parts are further interposed between the flange member 7 and the front cap 12. Also good. The pair of spacers 60 is obtained by dividing an annular plate member whose inner and outer diameters are substantially the same as those of the front cap 12 into two in the radial direction, and functions as a pushing jig. After the collar member 7 is fitted into the groove portion 1 using the spacer 60, the spacer 60 is pulled out in the radial direction and removed as shown in FIG. In addition, instead of the pair of spacers 60, a thin plate end material may be used.

  Thus, according to this chisel 4 with a hook, manufacture (mounting) can be performed more easily. Furthermore, since the collar member 7 is formed of a reinforced rubber material, when the collar member 7 is worn, the residue can be easily removed with a blade or the like, and replacement with a new collar member 7 is easy. . Therefore, attachment and removal of the eaves member 7 are easy, and the chisel body 3 can be reused.

As described above, according to the chisel with a hook for a hydraulic breaker according to the present invention, it is possible to provide a chisel with a hook for a hydraulic breaker and a hook member for a chisel that can be manufactured relatively inexpensively and easily.
It should be noted that the chisel with a hook for a hydraulic breaker according to the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the eaves member mounting portion has been described as an example configured by the groove portion 1 and the pair of large diameter portions 2 on both sides thereof, but is not limited thereto, and the eaves member mounting portion is, for example, a groove portion You may comprise only one. However, in order to ensure the restraining force in the axial direction, it is preferable that the flange member mounting portion is composed of the groove portion 1 and the pair of large diameter portions 2 on both sides thereof.
In addition, the flange member mounting portion is not limited to the groove portion 1, and the flange member mounting portion and the flange member have annular recesses on either one of the annular surfaces facing each other in the radial direction, It can be set as the structure which has an annular | circular shaped convex part which either one fits into the said recessed part.

For example, as in the first modification illustrated in FIG. 6, an annular convex portion 1 </ b> B is formed on the outer peripheral surface of the chisel body 3 </ b> B, and an annular convex portion is formed on the inner peripheral surface of the flange member 7 </ b> B. The structure which forms the annular recessed part 7M which can be fitted to the part 1B can be illustrated.
Here, in the first modification, the convex portion 1B is provided on the proximal end side adjacent to the first convex portion 1g on the distal end side and the first convex portion 1g. And a second convex portion 1f having a smaller diameter than the convex portion 1g. And this small diameter 2nd convex part 1f is provided in the outer peripheral surface on the opposite side to the cylindrical part 1s provided in the 1st convex part 1g side, and said 1st convex part 1g. And a conical surface 1t that decreases in diameter toward the opposite side. Furthermore, the 1st convex part 1g is formed as the taper surface 1h in which the outer peripheral surface has the inclination which diameter-reduces toward the base end side in an axial direction. On the other hand, the concave portion 7M of the flange member 7B includes a first concave portion 7r formed so as to be able to fit and fit in each of the first convex portion 1f and the second convex portion 1g, and a second concave portion 7p. The second concave portion 7p has a tapered surface 7h that comes into contact with the tapered surface 1h and has an inclination that decreases in diameter toward the proximal end in the axial direction. Even with such a configuration, the same operations and effects as the above-described embodiment can be achieved.

  Here, for example, when an external force (symbol F in FIG. 3) due to the collision of the earth and sand during operation or contact with the rock is strongly applied, depending on the degree of the external force F, it is turned up (deformation). As a result, there is a possibility that the flange member 7 may fall off the chisel body 3. Therefore, as a further modification of the above-described embodiment or the first modification, it is more preferable in preventing or suppressing such turning-up (deformation) and falling-off due to turning-up (deformation). You can also

  Specifically, as a modification corresponding to the above-described embodiment, as in the second modification illustrated in FIG. 7, the flange member 7 has a chisel base end side on the chisel base end side in the axial direction. An annular extension 7e extending toward the top is further provided. The extension 7 e has an inner diameter 7 f that is substantially the same diameter as the outer diameter of the chisel body 3. Thereby, this extension part 7e can illustrate the structure made to fit directly on the outer peripheral surface of the chisel main body 3 without a gap.

  Further, as a modification corresponding to the first modification, as in the third modification illustrated in FIG. 8, the flange member 7 </ b> B has a chisel base end side on the chisel base end side in the axial direction. An annular extension portion 7g extending toward is further provided. The extension 7g has an inner diameter 7m that is substantially the same as the outer diameter of the chisel body 3. Thereby, this extension part 7g can illustrate the structure which fits directly on the outer peripheral surface of the chisel main body 3 without gap.

In addition, when adopting these second to third modified examples, the normal chisel in the above-described embodiment to the first modified example is lengthened by an amount corresponding to the extended portion, or the axial direction of the flange member Move the mounting location at the tip of the chisel.
According to these second to third modified examples, in addition to the operations and effects of the above-described embodiment to the first modified example, the flange member 7 (or 7B) is disposed on the chisel base end side in the axial direction. Since it has an annular extension 7e (or 7g) extending toward the chisel base end side, and this extension 7e (7g) is adapted to fit directly on the outer peripheral surface of the chisel body 3, For example, even when an external force is applied to turn up the flange member 7 (7B) in the axial direction, the ring-shaped extension 7e (7g) improves its own strength. Since the extension portion 7e (7g) has a large contact area by directly fitting to the outer peripheral surface of the chisel body 3, it prevents or suppresses falling off due to turning-up (deformation) and turning-up (deformation). be able to.

  In the above embodiment, the eaves member 7 has been described as being formed of a reinforced rubber material. However, the present invention is not limited to this example, and the material of the eaves member 7 is, for example, referring to FIG. As described above, the flange member 7 is inserted from the proximal end side of the chisel body 3, the pressing force P is applied to the flange member 7, and the diameter of the groove portion 1 is increased by elastic deformation. Any member that can be fitted into the member mounting portion from the axial direction may be used.

As described above, when the scissors member is worn, the residue can be easily removed with a blade or the like, and the replacement with a new scissors member is easy, so that the scissors can be easily attached and removed. Moreover, in order to enable the chisel to be reused, it is preferable that the eaves member 7 is formed from an elastomer such as a reinforced rubber material or an elastic body containing the elastomer.
Further, in the above-described embodiment, the flange member mounting portion and the flange member are tapered surfaces in which the annular surfaces facing each other in the radial direction are inclined so as to reduce in diameter toward the proximal end side in the axial direction. However, the present invention is not limited to this, and a configuration without such a tapered surface may be employed. However, in order to prevent it from coming off easily after assembling even when an external force is applied, for example, due to a collision of earth and sand during operation or contact with the rock, the circles facing each other in the radial direction are used. It is preferable that the annular surface is the above-described tapered surface.

It is a figure explaining the main part of a breaker main part of a hydraulic breaker concerning the present invention. It is a figure explaining the chisel with a hook for hydraulic breakers concerning the present invention. It is a principal part enlarged view of the chisel with a hook for hydraulic breakers concerning the present invention. It is a figure explaining the crushing operation | work with the chisel with a hook for hydraulic breakers which concerns on this invention. It is a figure explaining the mounting method of the collar member in the chisel with a collar for hydraulic breakers concerning the present invention. It is a principal part enlarged view explaining the other example (1st modification) of the chisel with a hook for hydraulic breakers which concerns on this invention. It is a principal part enlarged view explaining the other example (2nd modification) of the chisel with a hook for hydraulic breakers which concerns on this invention. It is a principal part enlarged view explaining the other example (3rd modification) of the chisel with a hook for hydraulic breakers which concerns on this invention. It is a figure explaining the example of use which attached the conventional hydraulic breaker to the work vehicle. It is a figure explaining the crushing operation | work with the conventional chisel with a hook for hydraulic breakers. It is a figure explaining the example of the conventional chisel with a hook for hydraulic breakers.

Explanation of symbols

1 Groove (Ring member mounting part)
2 large diameter part (saddle member mounting part)
DESCRIPTION OF SYMBOLS 3 Chisel body 4 Chisel with ridge 6 Front head 7 鍔 Member 10 Breaker body 12 Front cap 20 Bracket 30 Hydraulic breaker 40 Arm 50 Work vehicle 60 Spacer 70 Object to be crushed

Claims (7)

A chisel with a hook used for a hydraulic breaker and inserted into the front head so as to be capable of reciprocating in the axial direction,
An annular flange member, and a chisel body to which the flange member is mounted. The chisel body is mounted on the outer side of the front head. Has a mounting part,
One of the flange member mounting portion and the flange member has an annular recess on an annular surface opposed to each other in the radial direction, and the other is an annular protrusion that fits into the recess. Formed with a portion,
A chisel with a flange for a hydraulic breaker, wherein the flange member is adapted to be mounted on the protrusion or recess of the flange member mounting portion by the elastic deformation of the recess or projection thereof.   2. The chisel with a hook for a hydraulic breaker according to claim 1, wherein the flange member is formed of an elastomer or an elastic body containing an elastomer.   The one of the recesses of the flange member mounting part and the flange member and the other protrusion that is fitted to the recesses are such that the annular surfaces that face each other in the radial direction are based on the axial direction. The chisel with a flange for a hydraulic breaker according to claim 1 or 2, wherein the chisel has a tapered surface having an inclination that decreases in diameter toward the end side. The flange member mounting portion includes the concave portion and a pair of large diameter portions provided adjacent to both sides of the concave portion and projecting in the radial direction, and at least the chisel base of the pair of large diameter portions. The large-diameter portion on the end side has a cylindrical portion provided on the concave portion side in the axial direction and a conical surface provided on the opposite side to the concave portion and reducing in diameter toward the opposite side. And
The flange member has an annular convex portion that fits into the concave portion of the flange member mounting portion, and a concave portion that is provided on the chisel base end side with respect to the convex portion and fits into the large diameter portion on the base end side. A chisel with a flange for a hydraulic breaker according to claim 3, further comprising a step portion. The flange member mounting portion includes the convex portion and a second convex portion that is provided adjacent to the chisel base end side of the convex portion and has a smaller diameter than the convex portion. The convex portion has a cylindrical portion provided on the convex portion side in the axial direction, and a conical surface provided on the opposite side of the convex portion and having a diameter decreasing toward the opposite side. And
The saddle member includes an annular concave portion that fits into the convex portion of the saddle member mounting portion, and a concave step portion that is provided on the chisel base end side with respect to the concave portion and fits into the second convex portion. The chisel with a hook for a hydraulic breaker according to claim 3.   The flange member has an annular extension portion extending toward the chisel base end side on the chisel base end side in the axial direction, and the extension portion is directly fitted to the outer peripheral surface of the chisel body. The chisel with a flange for a hydraulic breaker according to claim 4 or 5, wherein A scissors member mounted on a chisel with a scissors for a hydraulic breaker,
It is designed to be mounted on a chisel body having a saddle member mounting portion, and the saddle member mounting portion has an annular shape having a convex portion or a concave portion at a portion located outside the front head of the hydraulic breaker. Formed,
The flange member has an annular recess or protrusion that fits into the protrusion or recess on an annular surface that is radially opposed to the protrusion or recess of the flange member mounting portion. The chisel saddle member is configured such that the concave portion or the convex portion is attached to the convex portion or the concave portion of the saddle member mounting portion by elastically deforming itself.

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