JPS6123100Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention has a structure in which an inner arm portion is slidably fitted into a rectangular cylindrical outer arm portion, and a continuous cylinder connecting bracket is inserted through the inner arm portion. A notch is formed in the upper wall of the outer arm portion with an opening at its tip, and a reinforcing member connecting both side portions of the notch in the outer arm portion is provided at the end of the upper wall of the notch. The present invention relates to a shovel working arm that is bolted to the outer arm portion in a state where the arm is positioned at the outer arm portion.

The above arm is designed to be able to extend and contract in order to change the operating trajectory of the bucket, but because the tip of the outer arm part is stretched open by the excavation reaction force, it is necessary to attach a reinforcing member. In addition to the inconvenience of damaging the bolt, the top wall of the outer arm's tip is bent upwards due to the above-mentioned pushing-opening, and the lateral side wall of the tip of the outer arm's tip is bent inward. There was also the risk that the arm would be bent in the side, making it difficult to extend and retract the arm smoothly.

An object of the present invention is to prevent the tip of the outer arm portion from being pushed open by simple modification.

The characteristic configuration of the present invention is that receiving members are provided upwardly projecting on both sides of the opening side of the notch for inserting the cylinder coupling bracket in the outer arm part, and the receiving members are provided upwardly on both sides of the notch in the outer arm part. The reinforcing member connecting the members is connected with a stopper that receives and prevents the received members from moving laterally and outwardly when viewed in the longitudinal direction of the arm.

In other words, the reinforcing member prevents the tip of the outer arm portion from being pushed open by the excavation reaction force, and the stopper prevents the received member from being received by the stopper. This method reduces the load acting on the reinforcing member compared to simply blocking it with a reinforcing member, so damage to the reinforcing member mounting bolt can be suppressed. Because it can reliably prevent the tip of the outer arm portion from being pushed open, the lateral side wall of the tip of the outer arm portion is bent inward as the tip of the outer arm portion is pushed open. By suppressing the inconvenience caused by
This allows the arm to extend and retract smoothly over a long period of time.

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, the supporting arm 2a of the earth removal plate 2 is attached to a traveling machine base equipped with a crawler traveling device 1 so that it can be raised and lowered by a hydraulic cylinder 3, and the swivel base 4 is connected to a hydraulic motor (not shown). The first arm support bracket 5 is mounted on the swivel base ₄ so as to be rotatable around the vertical axis X ₂ by means of a hydraulic cylinder 6. , a first arm 7 is attached to the bracket 5 so that it can be moved up and down by a hydraulic cylinder 8, a second arm 9 is attached to the first arm 7 so that it can be moved up and down by a hydraulic cylinder 10; A bucket 11 is swingably attached to the arm 9 by a hydraulic cylinder 12, thereby forming a dozer and bucket hoe capable of carrying out earth removal work and ground excavation work.

As shown in FIGS. 1 to 4, the second arm 9 is constructed by connecting a rectangular cylindrical inner arm portion 9a with a bucket 11 attached to the tip to the first arm 7.
A rectangular cylindrical outer arm portion 9 whose base end is pivoted to
The outer arm portion 9 is slidably fitted into the inner arm portion 9b, and the outer arm portion 9
A first sliding plate 13 made of synthetic resin that comes into contact with the inner surface of the outer arm portion 9b is attached, and a first sliding plate 13 made of synthetic resin that comes into contact with the outer surface of the inner arm portion 9a is attached to each of the four sides of the tip end of the outer arm portion 9b. 2 sliding plate 14...
Furthermore, a hydraulic cylinder 15 for moving the inner arm portion 9a in and out is attached to both arm portions 9.
a and 9b, and by extending and retracting the second arm 9, the operating locus of the bucket 11 can be changed in order to excavate the bottom of a trench with different depths, etc. 1. Second sliding plate 13,1
4, the second arm 9 is configured to be able to extend and contract with little sliding resistance and play.

Further, a bracket 16 for connecting the bucket operating hydraulic cylinder 12 is provided on the upper wall of the inner arm portion 9a to project upward, and a notch 17 for inserting the bracket is provided on the upper wall of the outer arm portion 9b. The inner arm portion 9b is formed to be open at the distal end thereof, and the inner arm portion 9a can be inserted and assembled into the outer arm portion 9b while moving backward from the distal end thereof. There is.

With the reinforcing portion 25 connecting both sides of the notch 17 in the outer arm portion 9b positioned at the end of the opening of the notch 17, the bolt 2 is inserted.
6, 26, said outer arm portion 9
Receiving members 30, 30 are welded to both sides of the opening side end of the notch 17 in b, respectively, in a state that projects upward, and both receiving members 30, 30 are attached to the reinforcing member 25, as seen in the longitudinal direction of the arm. Stoppers 31, 31 are integrally formed to receive and prevent the members 30, 30 from moving laterally inward, thereby preventing the tip of the outer arm portion 9b from being pushed open by the excavation reaction force. It is made sure to be suppressed.

The first sliding plate 13... is connected to the inner arm portion 9a.
In order to attach it to the inner arm portion 9a, a cylindrical locking tool is attached to the inner arm portion 9a to lock and support each sliding plate 13 so that it can be moved in the direction of its surface and detachable in a direction perpendicular to its surface. 18... are provided, and each sliding plate 13... is provided on the upper wall and left side wall of the inner arm portion 9a.
Attach the bolts 19 and 20 that press the upper and left ones of them toward the outer arm portion 9b, and then connect the upper and left sliding plates 13 and bolts 19,
20, there is a metal plate-shaped body 21 for pressing the sliding plate.
a, 21b, and furthermore, the rear end of each sliding plate 13 excluding the upper part,
The first sliding plates 13 are arranged at different positions in the direction of extension and contraction of the arm, and each of the first sliding plates 13 is supported by the locking tool 18, so that it can be installed at a low cost and with a simple structure. Also, the upper and left ones of each first sliding plate 13 are connected to the outer arm portion 9 by bolts 19 and 20.
By pressing the second arm 9 toward the outside arm 9b, the second arm 9 is configured to be able to expand and contract well without play, regardless of wear caused by use. When inserting the sliding plates 13 while moving them backward from the tip thereof, the slide plates 13 are sequentially assembled into the locking tool 16 so that the rear end of each slide plate 13 is located at the rear. By assembling the arm parts 9a and 9b, the plate-shaped bodies 21a and 21 can be easily assembled.
By providing b, the sliding plate 13 can be attached to the bolt 1.
The bolts 19 and 20 of the sliding plate 13 may be deformed or damaged due to being locally pressed at the bolts 19 and 20 of the sliding plate 13.
This is configured to avoid inconveniences such as localized large wear and damage due to contact between the abutted portion and the rotating bolt 20.

The second sliding plate 14... is connected to the outer arm portion 9b.
In order to attach it to the left and right side walls of the outer arm portion 9b, the left and right slide plates 14 are immovably moved in the plane direction of the sliding plate 14 and perpendicular to the plane direction thereof. A frame body 2 is provided with cylindrical locking tools 22, 22 that are removably locked and supported in the direction, and is bolted to the lower wall of the outer arm portion 9b.
3, the lower one of each sliding plate 14 is locked and supported so as to be immovable in the surface direction thereof and removable in a direction orthogonal to the surface direction thereof, and a notch 17 in the outer arm portion 9b is provided. The upper one of each sliding plate 14 is locked and supported by the reinforcing member 25 that connects both side parts of the slide plate 14 so as to be immovable in the surface direction thereof and removable in a direction perpendicular to the surface direction thereof. Attach the bolt 27 and tighten the outer arm portion 9b.
Attach each sliding plate 14 to the lower and right side walls of the inner arm portion 9.
Attach the bolts 28a and 28b that press toward A, and further between the lower and right sliding plates 14 and 14 and the bolts 28a and 28b that press them.
As described in the mounting structure of the first sliding plate 13, the second sliding plate 14 is mounted with an inexpensive and simple structure by interposing the sliding plate pressing metal plate bodies 29a and 29b. Configure it so that
In addition, the second arm 9 is configured to be able to expand and contract without play regardless of wear caused by use, and furthermore, the sliding plates 14, 14 are connected to the bolts 28a, 2.
The structure is such that damage caused by being pressed by 8b can be avoided.

In carrying out the present invention, stoppers 31, 31 formed separately from the reinforcing member 25 may be attached to the reinforcing member 25.

Further, the present invention may be implemented without providing the sliding plates 13 and 14.

In addition, the present invention also includes the first arm 7 described in the embodiment,
It can be applied to various types of shovel work arms, such as the arms of face shovel work vehicles.

[Brief explanation of the drawing]

Figure 1 is a side view of the dozer and backhoe work vehicle.
Figure 2 is a partially omitted cutaway view of the second arm;
The figure is a cross-sectional view taken along the line -- in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line -- in FIG. 9a...Inner arm part, 9b...Outer arm part, 16...Bracket for cylinder connection, 17
... Notch, 25 ... Reinforcement member, 30 ... Received member, 31 ... Stopper.

Claims (1)

[Scope of utility model registration request] The inner arm portion 9a is slidably fitted into the square tubular outer arm portion 9b, and a notch 17 is provided in the outer side for inserting the cylinder connecting bracket 16 connected to the inner arm portion 9a. A reinforcing member 25 is formed in the upper wall of the arm portion 9b so as to be open at its tip, and connects both sides of the notch 17 in the outer arm portion 9b to the end of the notch 17. A shovel working arm bolted to the outer arm portion 9b in a positioned state,
The notch 17 in the outer arm portion 9b
A receiving member 3 is placed on each side of the opening side of the opening.
0,30 are provided to protrude upward, and on the reinforcing member 25,
Both received members 30, 3 when viewed in the longitudinal direction of the arm.
A shovel working arm characterized in that stoppers 31, 31 are arranged in series to catch and prevent the 0 from moving laterally and outwardly.