JPH05295901A - Attaching device for attachment - Google Patents

Abstract

PURPOSE:To simplify the attaching and detaching of a gripping device in an attachment attaching device, and to moderate a load acting on an arm at the time of gripping work to prevent the damage of the arm and make the gripping device correspond to the arms being different in their dimensions of various kinds of hydraulic shovels. CONSTITUTION:In a gripping device which is attached to the tip of the arm 1 of a hydraulic shovel or the like, and opened and closed using the bucket cylinder 27 of the hydraulic shovel, the frame 4 of the gripping device is rotatably attached in a bucket pin inserting hole 2 at the tip of the arm 1 of the hydraulic shovel by a pin 3. In addition, the upper and lower outside end faces of the arm 1 are attached through the side member 5 being adjustable in position of the gripping device so that their rotation may be checked. In the case where a cam 5 is used as the side member, a spring device 9 is provided as a cam energizing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping device that operates using a bucket cylinder of a hydraulic excavator used for dismantling a house or the like.

[0002]

2. Description of the Related Art A conventional gripping device is a bucket link, a fulcrum link, a bucket link pin, for mounting and operating a bucket which is a standard attachment of a hydraulic excavator when it is mounted on an arm of a hydraulic excavator or the like.
It was necessary to remove the fulcrum link pin etc. or replace it with a dedicated part.

The conventional gripping device shown in FIG. 5 will be described. To attach the gripping device 31 to the arm 1,
(Invention device) Bucket link 17 and fulcrum link 26
Remove the cylinder 27 to the intermediate link 32 pin 3
It was necessary to connect directly at 3. Further, after attaching the gripping device 31 to the arm 1 with the pin 3, it is necessary to replace the fulcrum link pin 25 of FIG. 1 with the pin 35 that fits the long hole 34 provided to correspond to the inter-pin distance of various models. was there.

Various proposals have been made to reduce the number of these replacement parts as much as possible, but it was necessary to replace the fulcrum link pin with a dedicated one in order to mount the accessory at the minimum. Further, the conventional gripping device is attached to the arm 1 by a rigid body connection, but the measure for reducing the load applied to the arm is not taken.

[0005]

Recently, the equipment for demolition of houses tends to be owned not only by demolition specialists but also by general civil construction contractors and general contractors, and these contractors often use hydraulic excavators for bucket work. However, the gripping device is often changed only when necessary. Therefore, in the case of the conventional gripping device, not only a lot of time and labor are wasted in removing and replacing the parts, but also problems such as loss of the removed parts have been raised. Further, the gripping device is required to have a general-purpose structure capable of supporting many types of hydraulic excavators of various companies having different mounting dimensions. Furthermore, the conventional gripping device
Since it is attached to the arm by rigid connection, a force generated by the gripping device itself or an external force through the gripping device is directly applied to the arm, which causes a problem of breaking the arm. In order to eliminate the above-mentioned drawbacks, it is possible to replace with a bucket by removing only two pins, a spring device is provided in the load direction of the gripping device, and the arm is elastically connected.

[0006]

A bucket (not shown) of a hydraulic excavator is removed, and a frame 4 of a gripping device is rotatably attached to a bucket pin insertion hole 2 at the tip of an arm 1 of the hydraulic excavator with a pin 3. In the present embodiment, only a case where a cam is used as a side member for mounting the frame 4 on the arm 1 so as to prevent the frame 4 from rotating is described. Although the stepped cams 5 and 5 are provided to fix the arm to the frame, the inclusion 7 is placed and fixed on the contact surface between the cam shaft 6 and the arm. This inclusion is formed in a plate shape with a steel plate or an elastic material. Therefore, since the arm and the frame are not rigidly connected, the arm is not damaged.
A protrusion 28 for preventing the inclusions from falling may be provided on the inner surface of the frame. The cam 5 is mounted eccentrically with the cam shaft 6,
A spring device 9 for urging the cam is provided on the lower stage of the inner surface of the frame 4.

In this spring device, a grease nipple 10 is provided on one side, a piston 11 is advanced by a prescribed amount of grease to be injected, and a spring guide 13 presses a cam lever 8 via a spring 12. . Lever 14,1 attached to the upper and lower camshafts
5 are connected by a connecting rod 16 so that the upper and lower cams 5, 5 are interlocked. Therefore, the arm 1 is clamped and fixed at a predetermined pressure by the spring device 9 via the cam 5 and the inclusion 7.

Next, the bucket link 17 is connected to the upper claw bracket 19 by the pin 18. The upper claw 20 is rotatably supported on the upper front side of the frame 4 by a shaft 21, and the lower claw 22 is a shaft 23.
Is rotatably supported on the lower front side of the frame 4 and is connected to the upper claw by a connecting link 24. The fulcrum link 26 and the cylinder 27 that are pivotally supported on the arm 1 by the fulcrum link pin 25 are used as they are attached to the hydraulic excavator.

[0009]

The operation of the present invention will be described. The cylinder 2
When 7 is extended, the fulcrum link 26 swings around the pin 25 as a fulcrum, pushes the bucket link 17, and rotates the upper claw 20 in the closing direction through the upper claw bracket 19 with the pin 18 as a fulcrum. At this time, since the lower claw is pushed through the connecting link 24, the lower claw 22 also rotates in the closing direction with the pin 23 as a fulcrum, and the upper claw and the lower claw hold an object. When the cylinder 27 is contracted, the upper and lower claws 20 and 22 rotate in the opening direction.

At the time of this gripping work, the force generated by the gripping device itself, for example, the cylinder 27 causes the bucket link 1 to move.
By pushing the upper claw 20 via 7, a moment about the pin 3 acts on the gripping device and exerts a bending moment on the arm 1, but when the moment exceeds a specified value, the lower cam 5 and cam lever 8 Since the spring 12 is compressed via the spring guide 13 to prevent the moment from rising, damage to the arm is prevented.

When an external force is applied to the tip of the upper claw 20 by the movement of the arm 1, an upward moment about the pin 3 is applied to the gripping device, and a force acts on the upper cam 5 to move the upper cam. Simultaneously with the rotation, the lower cam 5 also rotates via the lever 14 and the link 16 to compress the spring 12 and prevent the moment from rising. Also, the torsional moment often generated in the arm 1 can be relaxed.

Further, grease is injected from the grease nipple 10 and the arm 1 is clamped by the cam 5 with a predetermined force. However, since the inclusion 7 is interposed, the arm is not damaged. To remove the gripping device, the grease may be removed and the pins 3 and 18 may be removed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one example will be described. In the bucket pin insertion hole 2 at the tip of the arm 1 of a hydraulic excavator from which a bucket (not shown) is removed, a pin 3 is rotatably attached to a frame of a gripping device An upper cam 5 and a lower cam 5 eccentrically attached to a cam shaft 6 are provided on the frame 4 at the upper and lower outer end surface positions of the arm 1, and a plate-like inclusion 7 is interposed between each cam 5 and the frame 4. The cam fixes the arm to the frame. The inclusion may be a steel plate or an elastic material. A spring device 9 for urging the cam is provided inside the frame 4 at a position corresponding to the cam lever 8 of the lower cam. This spring device 9
Is provided with a grease nipple 10 on one side, the piston 11 is advanced by a predetermined amount of grease to be injected, and the cam lever 8 is moved by a spring guide 13 via a spring 12.
Is pressed to fasten the arm 1 to the frame 4. The levers 14 and 1 are attached to the upper and lower camshafts 6, respectively.
5 is attached and connected with the connecting rod 16.

Next, the bucket link 17 is connected to the upper claw bracket 19 by a pin 18, the upper claw 20 is rotatably supported on the front upper stage of the frame 4 by a shaft 21, and the lower claw 22 is a shaft 23 of the frame 4. The upper claw 20 and the lower claw 22 are connected by a connecting link 24 so as to be rotatably supported on the lower part of the front side. As the fulcrum link 26 and the cylinder 27 which are pivotally supported by the pin 1 on the arm 1, those attached to the hydraulic excavator are used as they are.

[0016]

As described above, according to the present invention, the gripping device can be attached only by pulling out the pin and the bucket pin attached to the arm of the hydraulic excavator.
The removal work is easy and the work can be done efficiently. Since the load applied to the arm during gripping work is relaxed and limited, accidents such as breakage of the arm can be prevented. Further, it has an excellent advantage that it can be applied to the arms of many types of hydraulic excavators having different sizes.

[Brief description of drawings]

FIG. 1 is a side view of the product of the present invention with a partial cross section.

FIG. 2 is a side view of the product of the present invention.

FIG. 3 is an enlarged cross-sectional view of a spring device.

FIG. 4 is an enlarged vertical sectional view of a mounting position of a cam.

FIG. 5 is a side view of a known gripping device.

[Explanation of symbols]

 1 arm 3 pin 4 frame of gripping device 5 cam 6 cam shaft 7 inclusions 8 cam lever 9 spring device

Claims (2)

[Claims] 1. A gripping device having a pawl attached to the tip of an arm 1 of a hydraulic excavator or the like and opened and closed by using a bucket cylinder of the hydraulic excavator, wherein a frame 4 of the gripping device is a bucket pin at the tip of the hydraulic excavator. Insertion hole 2
A mounting device for an attachment, which is rotatably mounted on a pin 3 on the outer end surfaces of the upper and lower stages of the arm by a side member 5 whose position can be adjusted. 2. The attachment mounting device according to claim 1, further comprising a spring device 9 for urging a cam 5 used as the side member whose position can be adjusted.