JPH1161875A - Replaceable multi-functional attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply replace opposite members opened or closed by forming connecting portions at the tip sections of arms protruded from a housing, and providing connecting members on the opposite members. SOLUTION: Side face plates 2b, 2c are connected to the upper face plate 2a of a housing 2 into a box shape. The base end of a cylinder main body is journalled to the side face plates 2b, 2c by pins 24 in the housing 2, and arms 15, 16 are journalled to the lower side section via pins 17, 18. When a fork member 25 is connected to the arm 15, a connecting pin 43 fixed between the brackets 41A, 41B of the fork member 25 is inserted into insertion grooves 32A, 32B. A connecting pin 35 is inserted into the through holes 42A, 42B of the brackets 41A, 41B and pin through holes 31A, 31B. A set pin 36 is inserted and fixed into a pin hole 35 a provided on the connecting pin 35. Various opposite members are provided to be replaceably fitted to the arms 15, 16, and brackets are provided on them. The opposite members can be simply replaced with optional members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchangeable multifunctional attachment to be mounted on a hydraulic excavator or the like, and more particularly, to a transmission means such as a link or an arm by a hydraulic cylinder mounted on a housing mounted on the tip of an arm of a hydraulic excavator. Via a pair of opposing members rotatably supported by the housing are moved toward and away from each other to open and close to perform construction work such as crushing, crushing, cutting, grasping, sandwiching or scooping. The required work can be performed by exchanging the members.

[0002]

2. Description of the Related Art Conventionally, an attachment to be mounted on the end of an arm of this type of hydraulic excavator is shown in FIGS.
As shown in FIG.
, A housing 2 is fixedly or rotatably mounted on the connecting member 1, and a base end of a hydraulic cylinder 3 is rotatably supported in the housing 2, and is fixed to a lower end of the housing 2. The central portions of the pair of arms 4 and 5 are rotatably supported by pins 6 and 7. The upper end of the one arm 4 is a rod 8 that extends and contracts from the hydraulic cylinder.
And the other end of the link 10 is connected to the arm 4 and the other arm 5 by pins 11 and 12 respectively.
Are connected via. When the attachment is a fork, fork members 1 are provided at the lower ends of the arms 4 and 5, respectively.
3, 14 are fixed by welding.

In the above-mentioned attachment, the hydraulic cylinder 3
The arm 4 rotates with the pin 6 as a fulcrum, and the arm 5 rotates with the pin 7 as a fulcrum via the arm 4 and the link 10 by the expansion and contraction operation of the rod 8. Fork member 1 fixed in accordance with the operation of these arms 4 and 5
3 and 14 operate in the direction of approaching / separating, so that waste material, dismantled material, crushed material, etc. are grasped by the proximity operation, and the material grasped by the separating operation is separated and taken out at a required position.

[0004] The above-mentioned attachment performs an operation of gripping waste materials, dismantled materials, and the like by opening and closing operations for moving the fork members 13 and 14 toward and away from each other. Attachments for construction work, such as a cutter for cutting dismantled materials and the like, and a crusher for crushing, crushing, and splitting dismantled materials, have the same configuration as the attachment of the fork.

Attachments such as forks, buckets, cutters, crushers, etc. are similar operations in which a pair of opposing members are opened and closed. Therefore, if the opposing members are exchanged, the drive portion can be used in common. Therefore, it is demanded that the opposing portions can be exchanged in pairs.

[0006] In order to respond to the above demand, an opposing member,
For example, the arms 4 and 5, which are welded and fixed to the fork members 13 and 14, respectively, are removed from the housing 2, and a pair of arms respectively welded and fixed to another facing member, for example, a pair of cutter members, are attached to the housing 2. What is provided to be attached to is provided.

[0007]

As described above, in the case of replacing the arms 4 and 5 rotatably supported by the housing 2 with the pins 6 and 7 as fulcrums, the pins 6, 7 and the arm 4 are replaced. Pins 11 and 12 at both ends of a link 10 connecting the rods 4 and 5 and a pin 9 connecting the arm 4 and the rod 8
Need to remove a total of 5 pins. Further, in order to attach the exchanged arms 4 and 5, it is necessary to use the five pins to rotatably connect the arms.

[0008] All of the above-mentioned five connecting portions by pins must be rotatably connected, so that the connecting structure is complicated. In particular, arms 4, 5
Are connected to the housing 2 by arms 6,5.
Therefore, a load is applied because they serve as a rotation fulcrum of the opposed members integrated with each other. Therefore, the pins 6 and 7 have a configuration in which bearings are interposed. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a structure in which an opposing member that is opened and closed can be easily replaced so that an attachment can be used by changing it to a fork, bucket, cutter, crusher, or the like. Is an issue.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises mounting a hydraulic cylinder on a housing connected to an arm of a power shovel, and rotatably supporting a pair of arms on the housing. While these arms are opened and closed by the hydraulic cylinder, a connecting portion is formed at each of the tips protruding from the housing of the pair of arms, and a pair of forks, buckets, cutters, crushers, etc., which are opened and closed, are operated. A connecting portion is also formed at the upper end of each of the opposing members, these opposing members are selected, and the connecting portions are removably connected and fixed to the connecting portions of the arms, respectively. The present invention provides an exchangeable multifunctional attachment characterized in that an opposing member is integrally operated.

As described above, in the present invention, the rotatably supported portion is not replaced, and the arm and the opposing member which are conventionally fixed by welding or integrally formed are separated from each other, and the arm is attached to the housing. The mounting member is rotatably supported, the opposing member is replaced with a member having a required shape, and the replacing opposing member is connected so as to be fixed integrally with the arm.

As described above, since the rotatably mounted portion is not replaced but is simply connected by a portion that can be simply fixed, the configuration of the connected portion can be simplified. Also,
Since it is only necessary to exchange a pair of arms with the opposing members, it is necessary to replace only two places, which is much easier than the conventional case where replacement work was required at five places. Can be As a result, the attachment can be easily exchanged for the required facing member, and the attachment can be easily and quickly exchanged from the fork to the bucket or from the crusher to the bucket with an attachment that changes according to the progress of the operation.

[0013] The arm of the power shovel and the housing are connected via a connecting member, a bracket of the connecting member is fixed to the arm, and a rotational driving means is mounted on the connecting member. It is preferable that a rotation output shaft is fixed to the housing, and the housing is rotatable with respect to the connecting member.

When the housing is made rotatable as described above, the pair of opposing members can be rotated to a position where the work can be easily performed with respect to the material to be crushed, and the working efficiency can be increased.

When the housing is driven to rotate as described above, an attachment such as a breaker for drilling or an auger can be included as the pair of exchange means opposed to each other. Accordingly, a connection bar is provided at the upper ends of the chisel and auger screw of the breaker for drilling, which is provided with a support bar extending horizontally to both sides, and provided at both ends of the support bar with a connection portion for detachably connecting and fixing the pair of arms. A piece is protruded, and the above-mentioned chisel or screw is replaced so that it can be attached (claim 3).

The hydraulic cylinder mounted on the housing has a base end rotatably supported on the housing and a distal end of an operating rod rotatably supported on a distal end of the one arm. And the other arm are rotatably supported at both ends of the link and connected to each other, and the pair of arms are preferably opened and closed in accordance with expansion and contraction of a rod of the hydraulic cylinder. ).

With the above structure, a pair of arms can be opened and closed by one hydraulic cylinder and one link, so that the drive mechanism provided in the housing that is not replaced can be simplified and durability can be improved. Can be.

Each of the pair of arms is composed of two plates pivotally supported on both sides of a pin connected to the housing, and the pair of opposing members detachably fixed to these arms are also spaced apart from each other by a distance. Protruding brackets,
A pin through-hole and a pin insertion groove are provided on the two plates of the arm, respectively, while a pin through-hole and a connecting pin are provided on the two brackets of the facing member, Is inserted into the pin insertion groove of the arm, and the arm and the pin through hole of the opposing member are aligned with each other and connected through the pin, thereby connecting and fixing the arm and the opposing member respectively.

With the above construction, the connecting pin can be connected and fixed through the pin by aligning the pin through-holes in a state where the connecting pin is temporarily inserted and inserted into the pin insertion groove, so that the workability is improved and the opposing member having the required shape can be easily formed. Can be replaced with In the case of the above-described connection structure, the shape of the pin insertion groove, the positional relationship with the pin through-hole, and the attachment of the connection pin to the pin insertion groove, and then attaching the lid to prevent the connection pin from being removed from the pin insertion groove. It can be reliably prevented.

Alternatively, two connecting pins are attached between the two brackets of each of the opposed members at an interval, while a pin insertion groove communicating with the two plates of each of the arms is opened, and a pin insertion groove is provided. The arm provided with the insertion groove is swingably mounted, and after inserting the connection pins of the opposing members into the pin insertion grooves, the other end of the arm is fixed with a screw and inserted into the pin insertion groove. May be connected and fixed in a state where it is prevented from falling off.

The structure in which the pair of arms pivotally supported by the housing and the pair of opposing members are detachably connected and fixed is not limited to the above-described structure. For that, a conventionally well-known connection fixing structure can be appropriately adopted.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

The first embodiment shown in FIGS. 1 to 4 is similar to the first embodiment shown in FIGS.
And the opposite member is replaceable. Therefore, the same members as those in FIGS. 12 and 13 are described with the same reference numerals.

That is, the arm 20 of the hydraulic power shovel and the link 21 are rotatably supported via the pins 22 and 23 on the bracket 1a projecting from the substrate 1b of the mounting member 1. An electric motor 24 is mounted on the substrate 1b,
Power is supplied from a battery (not shown) of the hydraulic power shovel to drive. The electric motor 21
Of the housing 2 projects downward, and the upper surface plate 2a of the housing 2
And the housing 2 can be turned in the horizontal direction.

The housing 2 has a side plate 2 and an upper plate 2a.
b and 2c are connected and fixed to form a box having a lower surface and one side opening. Inside the housing 2, the base end of the cylinder body 3 a of the hydraulic cylinder 3 is
And 2c so as to be rotatable, and these side plates 2b
And a pair of arms 1 in a substantially "C" shape on the lower side of 2c.
5 and 16 are rotatably supported via pins 17 and 18. These arms 15 and 16 are pins 17 and 1 respectively.
8, two plates 15a and 15b, 16a and 1
6b.

The two plates 15a and 1 of the one arm 15
5b with the cylinder body 3 of the hydraulic cylinder 3
A is connected via a pin 9 to the tip of a rod 8 which expands and contracts from a. Therefore, according to the extension and contraction operation of the rod 8, the pin 17
The arm 15 is rotated around the fulcrum. Also,
The center bending portion of the two plates 15a and 15b of the arm 15 is rotatably connected to one end of the link 10 via a pin 11.
The other end of the link 10 is connected to the upper end of the arm 16 and the pin 12
Are rotatably connected via a. Therefore, the arm 16
To the arm 15 and the link 10
The arm 15 and 16 are rotated by using the pin 18 as a fulcrum, and the arms 15 and 16 are opened and closed by approaching / separating according to the extension / contraction operation of the rod 8.

The arms 15 (15a, 15b), 16
The lower ends of (16a, 16b) are slightly protruded from the lower end of the housing 2, and the lower end forms a connecting portion 30 for connection with a pair of fork members 25, 26 or another opposing member. On the other hand, a connecting portion 40 is formed at the upper ends of the fork members 25 and 26 so as to be detachably connected to the connecting portion 30. In other words, in the figure, what is conventionally referred to as the disassembly position is divided into those conventionally integrated.

Connecting part 3 provided on arms 15 and 16
0 has the same shape, and the connecting portions 40 of the fork members 25 and 26 have the same shape. Therefore, the connection structure between the arm 15 and the fork member 25 will be described, and the description of the arm 16 and the fork member 26 will be the same. A reference numeral is attached and omitted.

As shown in FIG. 3 and FIG.
The two through-plates 15a and 15b facing each other have pin through holes 31 respectively.
A and 31B are drilled at the communication position. Further, pin insertion grooves 32A, 32B of side openings are formed at communication positions at positions away from the pin through holes 31A, 31B by a required dimension.

On the other hand, the fork member 25 has three holding claws 25b, 25 spaced apart from each other on the lower surface of the upper end connecting member 25a.
The upper ends of c and 25d are connected. The other fork member 26 is spaced apart from the lower surface of the upper end connecting member 26a by two.
It connects the pinching claws 26b, 26c of the book, and when closed,
The holding claws 26b and 26c are engaged with each other between the holding claws 25b to 25d.

The upper end connecting member 25a of the fork member 25
Two brackets 41A and 41B are protrudingly provided at the center of the upper end of the bracket at intervals, and pin through holes 42A and 42B are formed at the communicating positions with the brackets 41A and 41B, and the connecting pins are spaced apart by a required dimension. 43 are connected and fixed. As described above, the fork member 26 has the same configuration.

When connecting and fixing the fork member 25 to the arm 15, first, the bracket 41 of the fork member 25
A connecting pin 43 connected and fixed between A
Into the pin insertion grooves 32A and 32B. In this state, the pin through holes 42A, 4B of the brackets 41A and 41B
2B and the pin through-holes 31A and 31B on the arm 4 side are connected in series, a connecting pin 35 is inserted, and a T-shaped pin hole 35a provided at the tip end side of the shaft of the connecting pin 35 is inserted from the other end. Insert and fix the pin 36 in the shape of a circle. As described above, since the pin inserting operation and the pin fastening operation are performed by aligning the pin through holes with the connecting pin 35 being inserted and the fork member 25 being temporarily held, the workability is improved. In addition,
The connecting pins may be bolts and fastened with nuts.
Further, as described above, the fork member 26 is similarly connected and fixed to the arm 16 side.

In order to replace and attach to the arms 15 and 16, various opposing members are provided, and a pair of brackets are provided on these opposing members similarly to the fork members 25 and 26. Is attached, and can be replaced with the foam members 25 and 26 and attached to the arms 15 and 16.

FIGS. 5A to 5F show the arm 14,
15 shows an opposite member to be replaced and attached. FIG. 5 (A)
Indicates fork members 25 'and 26' provided with two clamping claws and one clamping claw, respectively. FIG. 5B shows a pair of bucket members 50 and 51. The bucket members 50 and 51 can be applied to a gripping bucket, a clamshell bucket, a skeleton bucket, a slope bucket, a raw concrete bucket, and the like. FIG. 5C shows a pair of cutter members 5.
2, 53 are shown. These cutter members 52 and 53 intersect in an X shape, and the intersection is rotatably connected by a pin 55. FIG. 5D shows a pair of cutter members 56 and 57 that do not intersect in the X shape as opposed members. FIG. 5E shows a pair of opposed members 58 and 59 of the crusher. FIG. 5F shows a pair of opposing members 60 and 61 of the rotary screen type bucket. A pair of opposing members for opening and closing the construction work attachments such as forks, buckets, cutters, and crushers are provided with brackets on the upper end members similarly to the fork members 25 and 26 so as to be detachable from the arms 15 and 16. A pin through hole for connection and fixing and a connection pin are provided so that they can be replaced and used as needed.

6 (A) and 6 (B), in addition to the construction work attachment which performs the work by opening and closing the above.
As shown in FIG. 3, support bars 62a, 63a extending horizontally on both sides are provided at the upper ends of the chisel 62 of the drill breaker and the screw 63 of the auger, and the support bars 62a,
At both ends of 63a, connecting portions 62b and 63b for connecting and fixing detachably to the pair of arms are protrudingly provided.
Alternatively, the screw 63 can be replaced and attached.

When the chisel 62 of the breaker or the screw 63 of the auger is connected and fixed to the arms 15 and 16, the electric motor 24 is driven without driving the hydraulic cylinder 3, and the chisel 62 or the screw 63 is driven.
Is rotated.

FIGS. 7A to 7E show modified examples of the connection fixing portion of the first embodiment. In FIG. 7A, a pin through hole 31 and a pin insertion groove 32 formed in an arm are shown. Are phased up and down, and the facing members 25 ', 2
The positions of the 6 'pin through-holes 42 and the connection pins 43 are also vertically shifted correspondingly. In FIG. 7B, the pin insertion groove 3
The connecting pin 43 is hardly pulled out in a J-shape in which 2 is bent. In FIG. 7C, after inserting the connecting pin 43 into the pin insertion groove 32, the lid 65 is attached and fixed with the bolt 66 to prevent the connecting pin 43 from coming off. FIG.
In (D), after the connecting pin 43 is inserted into the pin insertion groove 32, the retaining pin 67 is inserted into the pin insertion groove 32. Needless to say, as shown in FIG. 7E, a pin through hole may be used instead of the pin insertion groove.

FIGS. 8 and 9 show a second embodiment, in which the connection mechanism between the arms 15 and 16 and the opposing members including the fork members 25 and 26 is changed. That is, in the second embodiment, the pin insertion groove 70 is formed in the arm 15 so as to be open on one side, and the pin insertion groove 7 is opened on the other side.
1 is provided, and the lever 72 is attached to the arm 1
5 is rotatably supported by a support shaft 73 between the two plates 15a and 15b. The lever 72 is provided with a screw hole 73,
A screw 74 is screwed into the screw hole 73 from a hole provided in a connecting plate 15c for connecting the two plates 15a and 15b of the arm to move the position of the pin insertion groove 71.

On the other hand, two connecting pins 75 are provided at intervals on the brackets 41A and 41B of the fork members 25 and 26.
And 76 are mounted on a shaft. At the time of attachment to the arm 15, one connecting pin 75 is inserted into the pin inserting groove 70, and then the other connecting pin 76 is inserted into the pin inserting groove 71 of the lever 72. Thereafter, the screw 74 is screwed in, and the position of the pin insertion groove 71 is separated from the pin insertion groove 70 so that the connecting pins 75 and 76 are not removed from the pin insertion grooves 70 and 71, respectively.

As described above, a pair of connecting pins 75 and 76
Into the pin insertion holes 70 and 71 respectively.
An opposing member such as a heavy fork member can be temporarily temporarily held on the arm 15 and then connected and fixed by screwing, so that the workability is extremely improved.

FIGS. 10A and 10B show a third embodiment, in which a connecting piece 82 having protruding portions 80 and 81 protruding from both ends of arms 15 and 16 is provided, and one protruding portion 80 is inclined. Sharp pointed. On the other hand, a connecting portion between the opposing members 25 and 26 such as a fork member is provided with a bending portion 83 for fitting the inclined projecting portion 80 and a connecting portion 85 having a screw hole 84 at the other end. With the inclined protruding portion 80 fitted to the bending portion 83, the other end protruding portion 8
1 is placed on the connecting portion 85, and the screw 87 is tightened with the screw hole 84 in a state where the L-shaped stopper 86 is overlaid on the projecting portion 81, so that the connecting is fixed.

FIGS. 11A and 11B show a modification of the third embodiment, in which the other ends of the opposing members 25 and 26 are provided with bolt holes 84 '.
, A bolt hole 89 is provided in the other end projection 81 of the arm 14, and these bolt holes 84 ′
And 89 are bolted into each other and fastened and fixed with nuts 91.

In the third embodiment shown in FIGS. 10 and 11 and its modification, the acute projections 80 of the arms 15 and 16 are provided.
Is temporarily held by being fitted to the bending portion 83 of the facing member 54, and the other end is fixed by screwing in this state, so that workability is good.

Further, the present invention is not limited to the above-described embodiment, and can be applied to a case where there are two hydraulic cylinders. The present invention can be applied to a configuration in which an arm portion operated by the transmission means and an operated portion such as a claw of a fork or a blade of a cutter are divided and detachably connected and fixed.

[0045]

As is apparent from the above description, according to the present invention, since the operated members such as the blade of the fork and the blade of the cutter are detachably connected and fixed to the arm to be operated, the structure is simple. Can be replaced with any member. Further, only two replacement parts are required, and the replacement work can be performed quickly. Therefore, the attachment attached to the arm of the hydraulic power shovel can be easily changed to a fork, a cutter, a bucket, a crusher, a breaker, an auger, or the like as required.

Further, since there is no replacement at a portion which is rotatably mounted on the shaft, there is an advantage that the reliability of the conductive portion is not impaired.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a partial side view of FIG.

FIG. 3 is an exploded view of FIG.

FIG. 4 is a perspective view of a main part of the first embodiment.

FIGS. 5A to 5F are schematic diagrams showing another facing member of the first embodiment.

FIGS. 6A and 6B are schematic diagrams showing another opposing member of the first embodiment.

FIGS. 7A to 7E are schematic diagrams showing modified examples of the first embodiment.

FIG. 8 is a schematic front view of a main part of a second embodiment of the present invention.

FIG. 9 is a partial perspective view of FIG. 9;

FIGS. 10A and 10B are schematic diagrams of a third embodiment.

FIGS. 11A and 11B are schematic diagrams showing a modification of the third embodiment.

FIG. 12 is a front view of a conventional example.

FIG. 13 is a side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection member 2 Housing 3 Hydraulic cylinder 8 Rod 9, 11, 12, 17, 18 Pin 10 Link 15, 16 Arm 25, 26 Fork member 30, 40 Connection part 31, 42 Pin through hole 32 Pin insertion groove 41 Bracket 43 Connection pin

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[Procedure amendment]

[Submission date] February 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013] The arm of the power shovel and the housing are connected via a connecting member, a bracket of the connecting member is fixed to the arm, and a rotational driving means is mounted on the connecting member. Preferably, a rotation output shaft is fixed to the housing, and the housing is rotatable with respect to the connecting member.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

When the housing is driven to rotate as described above, an attachment such as a breaker for drilling or an auger can be included as the pair of exchange means opposed to each other. Accordingly, a connection bar is provided at the upper ends of the chisel and auger screw of the breaker for drilling, which is provided with a support bar extending horizontally to both sides, and provided at both ends of the support bar with a connection portion for detachably connecting and fixing the pair of arms. A piece is protruded, and the above-mentioned chisel or screw can be exchanged and attached.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

The hydraulic cylinder mounted on the housing has a base end rotatably supported on the housing and a distal end of an operating rod rotatably supported on a distal end of the one arm. And the other arm are rotatably supported at both ends of the link and connected to each other, and the pair of arms are preferably opened and closed according to the expansion and contraction of the rod of the hydraulic cylinder.

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (6)

[Claims] 1. A hydraulic cylinder is mounted on a housing connected to an arm of a power shovel, a pair of arms are rotatably supported on the housing, and these arms are opened and closed by the hydraulic cylinder. A connecting portion is formed at each of the tips protruding from the housings of the pair of arms, and a connecting portion is formed at each of the upper ends of a pair of opposing members such as a fork, a bucket, a cutter, and a crusher that are opened and closed. Each of these opposing members is selected, and the connecting portion thereof is detachably connected and fixed to the connecting portion of the arm, so that the arm and the opposing member are integrally operated. Characteristic interchangeable multifunctional attachment. 2. An arm of the power shovel and the housing are connected via a connecting member, a bracket of the connecting member is fixed to the arm, and a rotational driving means is mounted on the connecting member, and the rotational driving is performed. 2. The interchangeable multifunctional attachment according to claim 1, wherein a rotation output shaft of the means is fixed to the housing, and the housing is rotatable with respect to the connecting member. 3. A support bar extending horizontally on both sides of the upper end of a screw of a chisel and an auger of a breaker for drilling, and connecting portions for detachably connecting and fixing to the pair of arms at both ends of the support bar. 3. The interchangeable multifunctional attachment according to claim 2, wherein the attachment is protruded, and the chisel or the screw is exchangeable to be attachable. 4. A hydraulic cylinder mounted on the housing rotatably supports a base end of the hydraulic cylinder on the housing, and rotatably supports a distal end of an operating rod of the hydraulic cylinder with a distal end of the one arm. 4. The structure according to claim 1, wherein said arm and said other arm are rotatably supported at both ends of a link and connected to each other, and said pair of arms are opened / closed in accordance with an extension / contraction operation of a rod of said hydraulic cylinder. Item 4. The exchangeable multifunctional attachment according to any one of Items 3 to 7. 5. A pair of arms each comprising two plates pivotally supported on both sides of a pin connected to the housing,
Two brackets are also protruded from the pair of opposing members detachably fixed to these arms at intervals, and a pin through hole and a pin insertion groove are provided on the two plates of the arm, respectively. On the other hand, the two brackets of the opposing member are provided with a pin through-hole and a connecting pin is attached thereto. The connecting pin of the opposing member is inserted into the pin insertion groove of the arm, and the arm and the pin of the opposing member are inserted. The interchangeable multifunctional attachment according to any one of claims 1 to 4, wherein the through holes are aligned to be connected through a pin, and the arm and the opposing member are connected and fixed respectively. 6. The pair of arms each comprise two plates that are pivotally supported on both sides of a pin connected to the housing.
Two brackets are also protruded from the pair of opposing members detachably fixed to these arms at intervals, and two connecting pins are attached between the two brackets at an interval. On the other hand, a pin insertion groove communicating with the two plates of each arm is opened in one place, and a lever provided with the pin insertion groove is swingably attached, and these pin insertion grooves are respectively attached to the opposed members. 5. The connector according to claim 1, wherein after the pin is inserted, the other end of the lever is screwed and fixed, and the connection pin inserted into the pin insertion groove is fixedly connected in a state where the connection pin is prevented from coming off. Replaceable multifunctional attachment.