JP2003213944A - Mounting structure of clamp device on arm of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a clamp device, which can mount the clamp device on an existing construction machine by using an arm and a cylinder rod of the construction machine, and can reduce the number of component parts forming the clamp device, to thereby contribute to weight reduction and cost reduction. <P>SOLUTION: The clamp device 7 is constructed by axially supporting one end of a link 3 on a rear portion of an upper clamp 1, axially supporting the other end of the link 3 on a lower portion of a lower clamp 2, arranging an arm-side axial support portion 5 and a rod-side axial support portion 4 on the rear portion of the upper clamp 1, and arranging an arm-side axial support portion 6 on a rear potion of the lower clamp 2. Then, the clamp device 7 is arranged at the apex of the arm 8 of the construction machine such as a hydraulic shovel. Further, the arm-side axial support portion 5 of the upper clamp 1 and the arm-side axial support portion 6 of the lower clamp 2 are axially supported at the apex of the arm 8. Furthermore, the rod-side axial support portion 4 of the upper clamp 1 is axially supported at the apex of the cylinder rod 10 of a cylinder 9 attached to the arm 8. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a clamp device to an arm of a construction machine such as a hydraulic excavator when the clamp device is detachably attached to the arm.

[0002]

2. Description of the Related Art Conventionally, a bucket 22 for excavation originally provided in an arm 8 of a construction machine such as a hydraulic excavator.
Clamping device 7a for clamping waste materials and construction materials instead of
The clamp device 7a is used to dismantle houses and collect waste materials and scraps.

Arm 8 of a construction machine such as a hydraulic excavator
As shown in FIG. 13 to FIG.
2 is equipped. The bucket 22 for excavation is provided with a first shaft support portion 23 at a rear end portion thereof, and one end portion of a bucket rod 24 is pivotally supported above the rear end portion of the bucket 22, and the other end portion of the bucket rod 24 is provided at the other end portion thereof. A second shaft support 25 is provided. A first shaft support portion 23 provided at the rear end portion of the bucket 22 is supported by a shaft 27 in a hole 21 at the front end portion of the arm 8 of the construction machine, and one end portion is supported at the upper rear end portion of the bucket 22. Cylinder rod 1 of cylinder 9 attached to arm 8 and second shaft support 25 at the other end of rod 24 for bucket
The hole 28 provided at the tip end of 0 and the hole 29 at the tip end of the support link 11 attached to the arm 8 are communicated with each other, and the second shaft support portion 25 at the other end portion of the bucket rod 24 and the cylinder rod 10 are connected by the shaft 30. And the tip of the support link 11 is pivotally supported. Here, the rear end of the support link 11 is pivotally supported on the arm 8 by a shaft 34.

In the construction machine such as the existing hydraulic excavator having the above-mentioned structure, the bucket 22 is moved around the first shaft support 23 at the rear end of the bucket 22 by rotating the cylinder rod 10 of the cylinder 9 to expand and contract. The bucket 22 is rotated to perform excavation work.

By the way, in the construction machine constructed as described above, the bucket 22 is removed as shown in FIGS. 15 and 16, and the construction machine is mounted by using the arm 8, the cylinder and the support link 11. The clamp device 7a for sandwiching waste materials, building materials, etc. has a structure conventionally known from JP-A-6-280280. This conventional clamp device 7a is shown in FIG.
7, as shown in FIG.

That is, in the conventional clamp device 7a, the upper clamp 1 and the lower clamp 2 are pivotally supported by the shaft 57, and one end of the upper clamp opening / closing link 50 is pivotally supported by the upper clamp 1 by the shaft 52. The upper clamp 1 is provided with an arm side shaft supporting portion 5a, the lower clamp 2 pivotally supports one end of the lower clamp opening / closing link 51 by a shaft 53, and the other end of the lower clamp opening / closing link 51 is opened / closed by the upper clamp. A shaft 54 is pivotally supported near the other end of the working link 50.

Then, as shown in FIGS. 15 and 16, the bucket 22 for excavation is removed from the construction machine, and then the arm side shaft support portion 5a of the upper clamp 1 of the clamp device 7a having the above-described structure is attached to the tip portion of the arm 8. A shaft 66 is axially supported in the hole 21 and the hole 5 at the other end of the upper clamp opening / closing link 50 is provided.
5 and the hole 28 provided at the tip of the cylinder rod 10 of the cylinder 9 and the hole 29 at the tip of the support link 11 attached to the arm 8 so that the holes 55, 28, 29 of the three members are aligned and communicated with each other. In this state, the other end of the upper clamp opening / closing link 50, the tip end of the cylinder rod 10 and the tip end of the support link 11 are pivotally supported by the shaft 56.

When the clamp device 7a is opened and closed, the cylinder 9 is driven to drive the upper clamp opening / closing link 50 so that the upper clamp 1 is rotated about the arm side shaft support 5a at the rear end. Further, by driving the upper clamp opening / closing link 50, the lower clamp 2 pivotally supported on the upper clamp 1 is rotated, whereby the upper clamp 1 and the lower clamp 2 are opened or closed centering on the mutual axial support portions. It is supposed to be.

However, the arm 8, the cylinder rod 10, and the support link 1 provided in the construction machine as described above.
The conventional clamp device 7a that clamps waste materials, building materials, etc. mounted using 1 requires an upper clamp opening / closing link 50 and a lower clamp opening / closing link 51 for opening / closing and mounting the same. The number of links provided in the clamp device 7a is increased, and in order to attach the upper clamp opening / closing link 50 and the lower clamp opening / closing link 51, a large number of shafts such as shafts 52, 53, 54, 57 and a large number of bearings are provided. This is necessary, and as a result, there are problems that the number of members constituting the clamp device 7a increases, the structure becomes complicated, the weight increases, and the cost further increases. When mounting the clamp device, a hole 55 at the other end of the upper clamp opening / closing link 50, a hole 28 provided at the tip of the cylinder rod 10 of the cylinder 9, and a hole at the tip of the support link 11 attached to the arm 8 are attached. Since the holes 55, 28, and 29 of the three members with 29 are aligned and communicated with each other, it is necessary to attach the shaft 56 to the three members. Hole 5
Shaft 5 with 5, 28 and 29 aligned and communicating
There is a problem that the installation work is extremely difficult and can only be done by an operator having a high level of skill, and the connection takes time.

Another clamp device 7b to be attached to an arm of a construction machine is also known from Japanese Utility Model Publication No. 57-26935. This conventional example is as shown in FIG. 19, in which the upper clamp 1 and the lower clamp 2 are pivotally supported on the holder 60 by the shafts 69 and 70, and both ends of the connecting link 75 are respectively connected to the upper clamp 1 and the lower clamp. The clamp 2 is pivotally supported by the shafts 58 and 59, and the holder 6
0, the rod side link 61 is pivotally supported by the shaft 63, and both ends of the second connecting link 62 are pivotally supported by the rod side link 63 and the upper clamp 1 by the shafts 64 and 65, respectively, to form the clamp device 7b. The holder 60 is attached by the shafts 67 and 68 using the two holes 21 and 35 provided in the construction machine.
The rod side link 61 is pivotally supported on the tip of the cylinder rod 10 of the cylinder 9 provided in the construction machine.

By driving the cylinder 9,
The upper clamp 1 is rotated via the rod-side link 61 and the second connecting link 62, and the lower clamp 2 is rotated via the connecting link 75 when the upper clamp 1 is rotated. The clamp 1 and the lower clamp 2 are adapted to be opened or closed centering on the mutual pivotal support.

However, in this conventional example, the holder 40 is required in addition to the upper clamp 1 and the lower clamp 2 as the clamp device 7b, and the connecting link 75,
The second link link 62, the three links of the rod side link 61, and the shafts 58, 5 for pivotally supporting these links.
9, 63, 64, 75 and a large number of bearings are required, and there is a problem that the number of members constituting the clamp device 7a increases, the structure becomes complicated, the weight increases, and the cost further increases.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the clamp device can be mounted and the clamp device can be configured by using the arm and the cylinder rod provided in the existing construction machine. By reducing the number of members to be used, weight can be reduced and cost can be reduced,
Moreover, it is an object of the present invention to provide a structure for mounting a clamp device on an arm of a construction machine, which facilitates mounting work of the clamp device.

[0014]

In order to solve the above-mentioned problems, a structure for mounting a clamp device on an arm of a construction machine according to the present invention has one end of a connecting link 3 pivotally supported on a rear part of an upper clamp 1. The other end of the connecting link 3 is pivotally supported at the rear part of the lower clamp 2, and the arm side shaft support part 5 and the rod side shaft support part 4 are provided at the rear part of the upper clamp 1 and the arm at the rear part of the lower clamp 2. A clamp device 7 is configured by providing a side shaft support portion 6, the clamp device 7 is arranged at the tip of an arm 8 of a construction machine such as a hydraulic excavator, and the arm side shaft support portion 5 of the upper clamp 1 and the lower clamp 2 are arranged. The arm side shaft supporting portion 6 of the cylinder rod 1 of the cylinder 9 attached to the arm 8 respectively.
It is characterized in that the rod side shaft support 4 of the upper clamp 1 is pivotally supported at the tip of 0. With such a configuration, the clamp device 7, which is attached using the arm 8 and the cylinder rod 10 provided in the existing construction machine, is used only for the upper clamp 1, the lower clamp 2, and the one connecting link 3. In addition, since the rod side shaft support 4 of the upper clamp 1 need only be supported by the shaft 17 in the hole 28 at the front end of the cylinder rod 10 at the front end of the cylinder rod 10,
Only the positions of the holes of the two members (the holes 28 of the cylinder rod 10 and the holes of the rod-side shaft support 4) need to be aligned, and the work of aligning and connecting with the shaft 17 is simple.

Further, one end portion of the connecting link 3 is pivotally supported on the rear portion of the upper clamp 1, and the connecting link 3 of the upper clamp 1 is supported.
The arm side shaft support portion 5 is provided in the lower portion rearward of the shaft support portion of the rod side, the rod side shaft support portion 4 is provided above the arm side shaft support portion 5, and the arm side shaft support portion 6 is provided at the rear portion of the lower clamp 2.
And the other end of the connecting link 3 is pivoted rearward of the arm side shaft support 6 of the lower clamp 2 and the rear of the two holes 21 and 35 provided before and after the tip of the arm 8 is provided. The arm side shaft support 5 of the upper clamp 1 is pivotally supported in the hole 35,
It is preferable to pivotally support the arm side shaft supporting portion 6 of the lower clamp 2 in the front hole 21 and the rod side shaft supporting portion 4 of the upper clamp 1 in the tip portion of the cylinder rod 10. With such a configuration, the clamp device 7, which is attached using the arm 8 and the cylinder rod 10 provided in the existing construction machine, is used only for the upper clamp 1, the lower clamp 2, and the one connecting link 3. In what consists of members,
With a simple structure, the two holes (the hole 35 that pivotally supports the other end of the support link 11 and the hole 21 to which the bucket 22 is attached) provided in the tip portion of the arm 8 and the cylinder rod 1
The hole 28 provided at the tip of 0 (the hole 28 that pivotally supports one end of the support link 11 provided at the tip of the cylinder rod 10) is used to attach the upper clamp 1 and the lower clamp 2 to the arm 8. The upper clamp 1 can be attached and the upper clamp 1 can be attached to the cylinder rod 10, and the upper clamp 1 and the lower clamp 2 can be opened and closed by driving the cylinder rod 10.

It is preferable that one of the upper clamp 1 and the lower clamp 2 that can be opened and closed is a bucket A and the other is a lid B that opens and closes the opening of the bucket A. With such a configuration, in addition to the function of clamping the object to be clamped by opening and closing the bucket A and the lid B,
Bucket A for scraping scraps, scrap, sand, stones, etc.
The cover B is covered by the cover B so that the scooped or pinched object can be prevented from spilling and the amount of the scooped or pinched object can be increased by the internal capacity of the clamp A.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the accompanying drawings.

First, the bucket 22 for excavation attached to the arm 8 of an excavator such as a hydraulic excavator which is a construction machine will be described. Generally, the bucket 22 for excavation is shown in FIG.
As shown in FIGS. 3 to 16, the first shaft support portion 23 is provided at the rear end portion of the bucket 22 for excavation, and one end portion of the bucket rod 24 is provided above the rear end portion of the bucket 22 as described above. The second shaft support 25 is provided at the other end of the bucket rod 24. This bucket 2
The first shaft support portion 23 provided at the rear end portion of the bucket 2 is pivotally supported by the shaft 27 in the hole 21 at the front end portion of the arm 8 of the construction machine, and the bucket 2
2 a bucket rod 24 having one end axially supported on the upper rear end thereof
The second shaft support portion 25 at the other end of the cylinder 8 and the hole 28 provided at the tip of the cylinder rod 10 of the cylinder 9 attached to the arm 8.
And the hole 29 at the tip of the support link 11 attached to the arm 8
It is mounted by connecting the second shaft support portion 25 at the other end of the bucket rod 24, the tip end portion of the cylinder rod 10 and the tip end of the support link 11 by the shaft 30. Here, the rear end of the support link 11 is attached to the arm 8 by the shaft 34.
Is supported by. Then, by extending and contracting the cylinder rod 10 of the cylinder 9, the bucket 22 is rotated about the first shaft support 23 at the rear end of the bucket 22.
Is rotated, and excavation work is performed by the bucket 22.

Next, the arm 8 is replaced with the bucket 22.
The clamp device 7 attached to the tip of the will be described.

The clamp device 7 pivotally supports one end of the connecting link 3 to the rear portion of the upper clamp 1, pivotally supports the lower portion of the connecting link 3 to the lower clamp 2, and the upper clamp 1
The arm side shaft support 5 and the rod side shaft support 4 are provided in the rear part, and the arm side shaft support 6 is provided in the rear part of the lower clamp 2 to form a clamp device 7.

1 to 6 show an embodiment of the present invention, and FIGS. 7 to 12 show another embodiment of the present invention. Here, the structures of the upper clamp 1 and the lower clamp 2 are different in both embodiments, but since the basic forms are the same, they will be commonly described below. As shown in FIG. 5, FIG. 6 or FIG. 11, FIG. 12, a substantially V-shaped lower protrusion 12 is provided at the rear of the upper clamp 1, and the upper clamp 1 is provided near the protrusion base. 1, one end of the connecting link 3 is pivotally supported by a shaft 13, and a protruding tip end of the lower protruding portion 12 (that is, a lower portion rearward of a supporting portion of the rear part of the upper clamp 1 with the connecting link 3). Is provided with an arm-side shaft supporting portion 5, and an upper projecting portion 14 is provided on an upper portion of a rear portion of the upper clamp 1, and a projecting tip portion of the upper projecting portion 14 (that is, a position above the arm side shaft supporting portion 5 )
Is provided with a rod-side shaft supporting portion 4.

On the rear part of the lower clamp 2, the arm side shaft support 6 is provided.
Further, the other end of the connecting link 3 whose one end is pivotally supported by the upper clamp 1 is pivotally supported by the shaft 15 at a position rearward of the arm side pivotal support 6 of the lower clamp 2.

As described above, the clamp device 7 includes the upper clamp 1 having the arm-side shaft supporting portion 5 and the rod-side shaft supporting portion 4,
The lower clamp 2 having the arm-side shaft supporting portion 6 is pivotally supported and connected by a connecting link 3, and the number of members is the upper clamp 1, the lower clamp 2, the connecting link 3, and It is constituted by five members of two shafts 13 and 15.

Therefore, the bucket 22 for excavation attached to the arm 8 of the construction machine as shown in FIGS. 13 and 14.
Instead, the clamp device 7 having the above-described configuration is mounted as follows.

First, from the state of FIG. 13 and FIG. 14 to FIG.
As shown in FIG. 16, the tip of the arm 8 and the bucket 22
The shaft 27 that supports the shaft is removed, and the other end of the bucket rod 24, the tip of the cylinder rod 10 and the support link 1 are removed.
1 is removed to remove the bucket 22 from the arm 8 and the support link 11 is removed to remove the support link 11 from the shaft 34 that supports the arm 8 (FIGS. 15 and 16). Shows the state before removing the shaft 34, but in the present invention, the shaft 34 is actually removed and the support link 11 is removed). As a result, the two holes 21 and 35 are exposed at the tip of the arm 8 and the hole 28 is exposed at the tip of the cylinder rod 10.

Next, as shown in FIGS. 1 to 4 or 7 to 10, the clamp device 7 is arranged at the tip of the arm 8 of a construction machine such as a hydraulic excavator, and the tip of the arm 8 is Of the two holes 21 and 35, the hole 35 at the position where the support link 11 is removed and the upper clamp 1 of the clamp device 7
The shaft 16 (the shaft 16
May be used as the shaft 34), and the hole 28 at the tip of the cylinder rod 10 of the cylinder 9 attached to the arm 8 and the rod-side shaft support 4 of the upper clamp 1 are aligned with each other. And a shaft 17 (the shaft 30 may be used as the shaft 17 may be used), and is further supported by the hole 21 at the tip of the arm 8 and the clamp device 7.
It is attached by aligning the arm side shaft support portion 6 of the lower clamp 2 and supporting the shaft 18 by the shaft 18 (the shaft 18 may be the extracted shaft 27).

Here, when the clamp device 7 is attached to the arm 8 and the cylinder rod 10 of the construction machine as described above in the field, two attachment portions are attached to the arm 8 and one attachment portion is attached to the cylinder rod 10. In each case, it is only necessary to align the holes of the two members and connect them by the shaft, and the positions of the three holes like the conventional ones that align the holes of the three members and connect them by the shaft. The mounting work of the clamp device 7 can be carried out much more easily than the case where the clamp device 7 is aligned and supported by the shaft.

As described above, the excavating bucket 22 attached to the arm 8 of the construction machine is replaced with the clamp device 7 having the above-described structure. In use, the arm 8 is rotated. By rotating the entire clamp device 7 and contracting the cylinder rod 10 as shown in FIG. 3, FIG. 4 or FIG. 9, FIG.
Is rotated about the shaft 16 to open, and thus the upper clamp 1 is rotated in the opening direction, whereby the lower clamp 2 is rotated about the shaft 18 via the connecting link 3 to open. As a result, the clamp device 7 is opened. On the other hand, by extending the cylinder rod 10 as shown in FIG. 1, FIG. 2 or FIG. 7, FIG. 8, the upper clamp 1 is rotated around the shaft 16 and closed, and thus the upper clamp 1 is closed in the closing direction. By rotating, the lower clamp 2 via the connecting link 3
Rotates about the shaft 18 and closes, whereby the clamp device 7 closes.

In the embodiment shown in FIGS. 1-6,
Upper clamp 1 and lower clamp 2 as clamping device 7
Each has a claw structure so that it is easy to dismantle a house and collect scraps and scraps.

On the other hand, in the embodiment shown in FIGS. 7 to 12, one of the upper clamp 1 and the lower clamp 2 is constituted by the bucket A, and the other is constituted by the lid B for opening and closing the bucket A. I am doing it. 7 to 1
In the embodiment shown in FIG. 2, in addition to the function of clamping the object to be clamped by opening and closing the bucket A and the lid B, the bucket A scoops off waste materials, scrap, sand, stones, etc. It can be pinched or pinched.
Here, as shown in FIG. 10, the lid B is also formed into a container shape in which the opening side of the bucket A is open, so that the bucket A can also store waste material, scrap, sand, stones, etc. The bucket A can effectively scoop up waste materials, scrap, sand, stones, etc., and the lid B can be used to cover or pinch.

In particular, when dismantling a house, disassembling is performed while clamping it with the basket A and the lid B which form the upper clamp 1 and the lower clamp 2, and scrape the scraps and scraps dismantled with the bucket A to make a lid. The same clamp device 7 can perform a series of operations of covering the body B and loading it on a truck or the like.

[0032]

As described above, according to the first aspect of the present invention, one end of the connecting link is pivotally supported on the rear portion of the upper clamp, and the other end of the connecting link is attached to the rear portion of the lower clamp. And the arm side shaft supporting part and the rod side shaft supporting part are provided at the rear part of the upper clamp, and the arm side shaft supporting part is provided at the rear part of the lower clamp to form a clamp device. A cylinder of a cylinder attached to the arm, which is placed at the tip of the arm of the construction machine, and pivotally supports the arm side shaft support of the upper clamp and the arm side shaft support of the lower clamp, respectively, at the tip of the arm. Since the rod side shaft support of the upper clamp is rotatably supported at the tip of the rod, the clamp device that attaches using the arm and cylinder rod provided in the existing construction machine can be used as the upper clamp. And the lower clamp and one connecting link can be configured by three members, the number of members constituting the clamping device can be reduced, the configuration can be simplified, the weight can be reduced, and the cost can be reduced. Also,
At the tip portion of the cylinder rod, the rod side shaft support portion 4 of the upper clamp 1 need only be pivotally supported by the shaft 17 in the hole at the tip portion of the cylinder rod, so that it is only necessary to align the holes of the two members. The work of connecting with a shaft is easy.

In addition to the effect of the invention described in claim 1, in the invention described in claim 2, one end of the connection link is pivotally supported at the rear part of the upper clamp, and the connection link of the upper clamp is provided. The arm side shaft support is provided in the lower part behind the shaft support part, and the rod side shaft support is provided above the arm side shaft support, and the arm side shaft support is provided at the rear of the lower clamp and the lower clamp The other end of the connecting link is rotatably supported rearward of the arm-side fulcrum, and the arm-side fulcrum of the upper clamp is rotatably supported in the rear hole of the two holes provided in front and rear of the tip of the arm. Since the arm side shaft support of the lower clamp is rotatably supported in the front hole, the clamp device that uses the arm and cylinder rod provided in the existing construction machine to attach the upper clamp, the lower clamp, and Link only With a simple structure, the upper clamp and the lower clamp are attached to the arm using two holes provided at the tip of the arm, and the upper clamp and the lower clamp are driven by driving the cylinder rod. The clamp can be opened and closed, and as a result, the mechanism of the clamp device can be simplified, and the arm of the upper clamp can be installed in the rear hole of the two holes provided in the front and rear of the tip of the arm. Since the side shaft support is supported, the arm side shaft support of the lower clamp is supported in the front hole, and the rod side shaft support is supported in the hole at the tip of the cylinder rod. In the shaft supporting portion, the holes of the two members may be aligned and connected by the shaft, and it is not necessary to align the holes of the three members, which are heavy in the field, and connect them by the shaft. There are those performed very easily, and since the three members may not be axially supported in one place, the horizontal width also not widely in the axial journal section, in which can be made compact.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, either the upper clamp or the lower clamp which can be opened and closed is a bucket, Since the other is a lid that opens and closes the opening of the bucket, in addition to the function of clamping the object to be clamped by opening and closing the bucket and the lid, the bucket scoops stones, sand, construction waste materials, etc. It can be used with a lid or a pinch, so that the scooped or pinched item does not spill and various usage forms can be obtained. It will increase by the amount of contents.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a clamp device of the present invention is attached to an arm of a construction machine and closed.

FIG. 2 is a perspective view of the above-mentioned closed state.

FIG. 3 is a side view showing a state in which the above clamp device is attached to an arm of a construction machine and opened.

FIG. 4 is a perspective view of the above open state.

FIG. 5 is a side view of the same clamping device before being attached to the arm of the construction machine.

FIG. 6 is a perspective view of the above.

FIG. 7 is a side view showing a state in which the clamp device according to another embodiment of the present invention is attached to an arm of a construction machine and is closed.

FIG. 8 is a perspective view of the above-mentioned closed state.

FIG. 9 is a side view showing a state in which the above clamp device is attached to an arm of a construction machine and opened.

FIG. 10 is a perspective view of the above open state.

FIG. 11 is a side view before the clamp device is attached to the arm of the construction machine.

FIG. 12 is a perspective view of the above.

FIG. 13 is a side view showing a state in which a bucket for excavation is attached to an arm of the construction machine of the above.

FIG. 14 is a perspective view of the above.

FIG. 15 is a side view showing a state in which a bucket for excavation is attached from an arm of the construction machine of the above.

FIG. 16 is a perspective view of the above.

FIG. 17 is a perspective view showing a state in which a clamp device is attached to an arm of a conventional construction machine.

FIG. 18 is an explanatory diagram showing opening and closing of a clamp device attached to an arm of a conventional construction machine.

FIG. 19 is an explanatory view showing opening and closing of a clamp device attached to an arm of another conventional construction machine.

[Explanation of symbols]

1 Upper clamp 2 Lower clamp 3 connection links 4 Rod side shaft support 5 Arm side shaft support 6 Arm side shaft support 7 Clamp device 8 arms 9 cylinders 10 cylinder rod

Claims (3)

[Claims] 1. An end portion of the connecting link is pivotally supported on the rear portion of the upper clamp, the other end portion of the connecting link is pivotally supported on the rear portion of the lower clamp, and an arm side pivotal portion and a rod are disposed on the rear portion of the upper clamp. A side shaft support part is provided and an arm side shaft support part is provided at the rear part of the lower clamp to form a clamp device.The clamp device is arranged at the tip of the arm of a construction machine such as a hydraulic excavator, and the arm of the upper clamp is provided. The side shaft support and the arm side shaft support of the lower clamp are respectively supported at the tip of the arm, and the rod side shaft support of the upper clamp is supported at the end of the cylinder rod of the cylinder attached to the arm. A structure for attaching a clamp device to an arm of a construction machine, which is characterized in that 2. An end portion of a connecting link is pivotally supported on the rear portion of the upper clamp, and an arm side pivotal support portion is provided at a lower portion rearward of a pivotal support portion of the upper clamp with the connecting link and above the arm side pivotal support portion. The rod side shaft support is provided at the position, the arm side shaft support is provided at the rear part of the lower clamp, and the other end of the connecting link is supported rearward of the arm side shaft support of the lower clamp. Of the two holes provided in the front and rear, the arm side shaft support of the upper clamp is supported in the rear hole, and the arm side shaft support of the lower clamp is supported in the front hole.
2. The mounting structure for a clamp device to an arm of a construction machine according to claim 1, wherein a rod side shaft support portion of an upper clamp is pivotally supported on a tip end portion of the cylinder rod. 3. The bucket, one of the upper clamp and the lower clamp that can be opened and closed is a bucket, and the other is a lid that opens and closes the opening of the bucket.
Alternatively, the structure for attaching the clamp device to the arm of the construction machine according to claim 2.