JPH0941419A - Bucket link oscillation restricting device for hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a bucket link when a clamshell is mounted on a hydraulic shovel and used as an operating tool and prevent damage to an arm due to the oscillation of the bucket link and noise due to the contact of the arm when the bucket link remains mounted. SOLUTION: Brackets 11, 12 are fixed to a bucket link 6 and an idler link 5, respectively, and fastened with bolts, a protrusion is firmly provided for the bucket link 6 and a protrusion receiver is firmly provided for an arm, both being engaged each other, or a stopper is firmly provided for the idler link 5 to restrict the oscillation of the bucket link 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a device for restricting swing of a bucket link mounted on a hydraulic excavator.

[0002]

2. Description of the Related Art FIGS. 14, 15 and 16 are views for explaining a conventional technique. 14 and 15, 1 is an upper swing body, 2 is a boom, 3 is an arm, 4 is a bucket cylinder, 5 is an idler link, 6 is a bucket link, and 7 is a bucket link.
Is a pin, 8 is a bucket, and 9 is a clamshell. FIG.
When the bucket 8 shown in FIG. 4 is removed and a work tool such as the clamshell 9 shown in FIG. 15 that does not require the bucket link 6 is attached and the work is performed, the bucket cylinder 4 and the idler link 5 are joined by the pin 7. The bucket link 6 swings around and collides with the upper surface of the arm 3 during the clamshell operation. Then, the coating of the arm is peeled off, the upper surface of the arm is dented, noise is generated due to rattling, and a collision sound with the arm is generated. To prevent this, the bucket link 6 was removed.

In one embodiment disclosed in Japanese Unexamined Patent Publication No. 5-132969 shown in FIG. 16, when the loader front is transported, the bucket link 6 attached to the lower side of the arm 3 is provided with a chain or a string. Means for attracting to the arm are provided by using a hook-shaped connector. While the above-mentioned Japanese Patent Laid-Open Publication No. Hei 10-78 is intended to facilitate transportation, the present invention is intended to eliminate inconvenience during work. Further, in contrast to the above-mentioned Japanese Patent Laid-Open No. Heihei, which provides a means for pulling the bucket link toward the rear portion of the arm, the means of the present invention fixes the bucket link toward the front portion of the arm or swings by a stopper. That is a limitation. That is, the purpose and means are different. Therefore, the present invention is different from the technique of the above publication.

[0004]

In the prior art, when a bucket link was not used as a work tool like a clamshell, it was necessary to remove the bucket link, which was troublesome. If you do not remove it, the bucket link will swing around and collide with the upper surface of the arm, peeling off the paint on the arm, making a dent on the upper surface of the arm, or making noise from rattling. Or, there was a collision sound with the arm. Alternatively, it is necessary to exercise caution such as slowly moving the machine so that the bucket link does not swing and collide with the arm. The problem to be solved by the present invention is to prevent the bucket link from swinging and colliding with the arm.

[0005]

In order to solve the above-mentioned problems, according to the present invention, in a construction machine in which a boom, an arm and a bucket are sequentially connected to a front portion of an upper swing body,
When installing a work tool that does not require a bucket link instead of a bucket, the bucket link is fixed to the upper surface of the front part of the arm while the bucket cylinder is contracted. As a result, the bucket link does not swing.

As a means for fixing the above, brackets are fixed to the lower surface of the bucket link and the upper surface of the idler link, respectively, and the brackets are passed through and bolted. As a result, the bucket link does not swing.

As another means, a hooking projection metal fitting is fixedly provided on the lower surface of the bucket link, and a receiving metal fitting corresponding to the hooking projection metal fitting is provided on the upper surface of the arm to operate the bucket cylinder. The hook projection metal fitting was engaged with the metal fitting. As a result, the bucket link does not swing.

As another means, a stopper is fixedly provided on the inner side surface of the idler link, and the lower surface of the bucket link is brought into contact with the stopper when the bucket cylinder is contracted. As a result, the bucket link tip boss does not contact or collide with the upper surface of the arm.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. The first embodiment is shown in FIGS. 1, 2 and 3. 1 is a side view of an essential part, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view of an essential part viewed from A of FIG. In the figure,
Reference numeral 10 is a thin plate of rubber or synthetic resin that does not damage the arm, and is attached to the arm 3. Reference numeral 11 is a bracket, which is fixed to the lower surface of the bucket link 6. A bracket 12 is fixed to the upper surface of the idler link 5. The fixed positions of the brackets 11 and 12 are as follows: when the bucket cylinder 4 is contracted to the stroke end by the operation from the driver's seat and the bucket link 6 is rotated about the pin 7 toward the idler link 5 side, The holes 13 and 14 provided in each of the brackets 11 and 12 are made to correspond in the horizontal direction. After matching the positions of the holes 13 and 14, the bolt 15 is inserted through the holes 13 and 14, and the nut 16 is tightened. Instead of tightening the bolts, retaining devices such as pins and split pins may be used. As a result, the bucket link 6 is fixed and does not swing.

A second embodiment is shown in FIGS. 4 and 5. FIG. 4 is a side view of a main part, and FIG. 5 is a plan view of the main part of FIG. In the figure, 17 is a block having a screw hole 18 at the center of the upper surface,
It is fixed to the upper surface of the arm 3. With the bucket cylinder 4 contracted to the stroke end, a bolt hole 19 is provided in the bucket link 6 corresponding to the position of the screw hole 18 of the block 17. Then, the bucket link 6 is fastened to the block 17 with the bolt 20. Figure 4 above
In the state shown in, the bucket link 6 is fixed and does not swing. In this embodiment, block 1
Although the screw hole 18 is provided in the block 7, the screw rod may be provided in the upper surface of the block 17, the screw rod may be projected through the hole 19 opened in the bucket link 6, and the nut may be tightened to the screw rod. Further, a pin may be used instead of the screw rod, and a retaining device such as a split pin may be used instead of the nut.

A third embodiment is shown in FIGS. 6 and 7. FIG. 6 is a side view of the main part, and FIG. 7 is a plan view of the main part. In the figure, 21 is a block having a screw hole on the side surface, which is fixed to the upper surface of the arm. In a state where the bucket cylinder 4 is contracted to the stroke end, the bucket link 6 is rotated around the pin 7 toward the arm 3 side, and when the lateral member a of the bucket link 6 is in contact with the block 21, Bolt holes are provided in the vertical member B of the bucket link 6 in correspondence with the positions of the screw holes. Then, the bucket link 6 is fastened to the block 21 with the bolt 22.
As described above, in the state shown in FIG. 6, the bucket link 6 is fixed and does not swing.

A fourth embodiment is shown in FIGS. 8 and 9. FIG. 8 is a side view of the main part, and FIG. 9 is a perspective view of the main part viewed from B of FIG.
In the figure, reference numeral 23 denotes a hooking projection metal fitting, which is fixed to the lower surface of the front portion of the bucket link 6 at approximately the center of its width. 24
Is a receiving metal fitting corresponding to the above-mentioned hooking projection metal fitting, and is fixed to the upper surface of the arm 3 substantially at the center of its width. FIG. 9 shows a state in which the bucket cylinder 4 is contracted to the stroke end. From this state, the bucket cylinder is slightly extended to engage the hooking projection fitting 23 with the fitting 24. In the state shown in FIG. 8 as described above, the bucket link 6 does not swing.

In the second, third and fourth embodiments,
After fixing the bucket link, the operator mistakenly operates the operation lever of the bucket cylinder, and the fixing bolt 20,
For the possibility of damaging 22, the hooking projection metal fittings 23, and the receiving metal fittings 24, in practice, after fixing the bucket link, the hydraulic pipe to the bucket cylinder is removed and used in the circuit of the turning device of the work tool. Since it is diverted, the bolts and metal fittings will not be damaged.

A fifth embodiment is shown in FIGS. 10 and 11. FIG.
0 is a side view of the main part, and FIG. 11 is a plan view of the main part of FIG.
In the figure, 25 is a stopper, which is fixed to the inner side surface of the idler link 5. Fixed position is bucket cylinder 4
When the bucket link 6 is rotated to the arm 3 side about the pin 7 in a state where the bucket link 6 is contracted to the stroke end, the bucket link 6 is positioned to prevent the bucket link 6 from coming into contact with the upper surface of the arm 3. Since the swing of the bucket link 6 toward the arm side is restricted by the above, the bucket link 6
Does not contact the arm 3.

A sixth embodiment is shown in FIGS. 12 and 13. FIG.
2 is a side view of the main part, and FIG. 13 is a plan view of the main part of FIG.
In the figure, 26 is a stopper, which is fixed to the upper surface of the arm 3. The fixed position is the bucket link 6 when the bucket cylinder 4 is contracted to the stroke end.
When the is rotated about the pin 7 toward the arm 3 side,
The position is set to prevent the bucket link 6 from coming into contact with the upper surface of the arm 3. Since the swing of the bucket link 6 to the arm side is limited by the above, the bucket link 6 is not
Do not touch.

The stopper 25 in the fifth and sixth embodiments,
The material of 26 is usually iron, but in order to prevent the stopper from being scratched, hard rubber or synthetic resin is used as the stopper itself or is fixed to the surface of the iron stopper.

In each of the above-mentioned embodiments, the bucket link is shown as an integral one, but in a small hydraulic excavator, the bucket link may be constructed as separate parts on the left and right sides. Even in that case, the first, third and
The fourth, fifth and sixth embodiments are available.

[0018]

When a work tool that does not require a bucket link, such as a clam shell, is used and the bucket link swing limiting device of the present invention is used, the bucket link swings and collides with the arm. It is possible to prevent the coating of the arm from being peeled off, the upper surface of the arm to have a dent, the rattling to generate noise, and the noise of collision with the arm. Therefore, there is no need to remove the bucket link, which is convenient.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing a first embodiment.

FIG. 2 is a plan view of an essential part of FIG.

FIG. 3 is a perspective view of a main part viewed from A of FIG.

FIG. 4 is a side view of an essential part showing a second embodiment.

FIG. 5 is a plan view of a main part of FIG. 4;

FIG. 6 is a side view of an essential part showing a third embodiment.

FIG. 7 is a plan view of a main part of FIG. 6;

FIG. 8 is a side view of an essential part showing a fourth embodiment.

FIG. 9 is a perspective view of a main part viewed from B of FIG.

FIG. 10 is a side view of an essential part showing a fifth embodiment.

FIG. 11 is a plan view of an essential part of FIG.

FIG. 12 is a side view of essential parts showing a sixth embodiment.

13 is a plan view of an essential part of FIG.

FIG. 14 is a diagram showing a conventional technique.

FIG. 15 is a diagram showing a conventional technique.

FIG. 16 is a reference diagram of a conventional technique.

[Explanation of symbols]

 3 Arm 4 Bucket Cylinder 5 Idler Link 6 Bucket Link 7 Pin 8 Bucket 9 Clamshell 11,12 Bracket 17,21 Block 23 Hook Protrusion Metal Fitting 24 Receiving Metal Fitting 25,26 Stopper

Claims (4)

[Claims] 1. A construction machine in which a boom, an arm, and a bucket are sequentially connected to a front portion of an upper swing body, and when a work tool that does not require a bucket link is attached instead of the bucket, the bucket cylinder is in a contracted state. The bucket link swing limiter for a hydraulic excavator, characterized in that the bucket link is fixed to the upper side of the front part of the arm. 2. A bucket for a hydraulic excavator according to claim 1, wherein brackets are fixed to the lower surface of the bucket link and the upper surface of the idler link, and the brackets are bolted through the brackets. Link swing limiter. 3. A hooking projection metal fitting is fixedly provided on a lower surface of the bucket link, and a receiving metal fitting corresponding to the hooking projection metal fitting is provided on an upper surface of the arm, and the hooking projection is operated by operating a bucket cylinder. 2. The bucket link swing limiting device for a hydraulic excavator according to claim 1, wherein the metal fitting is engaged with the metal fitting. 4. A stopper is fixedly provided on the inner side surface of the idler link, and when the bucket cylinder is contracted, the lower surface of the bucket link is brought into contact with the stopper to prevent the bucket link tip boss from contacting the upper surface of the arm. A bucket link swing limiting device for a hydraulic excavator, characterized in that