JPS6115092Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a cylindrical outer arm part, and a plurality of inner arm parts are attached in the circumferential direction on the outer surface of the sliding plate, which slides in contact with the inner surface of the outer arm part. The present invention relates to a shovel working arm that can be internally fitted.

The above-mentioned arm is designed to be able to extend and contract in order to change the operating trajectory of the bucket, and is also designed to be able to extend and contract with less sliding resistance due to the sliding plate and with less backlash between the two arm parts. In the arm for shovel work having the above advantages, the mounting structure of the sliding plate is constructed to be inexpensive, simple, and also allows easy assembly of both arm parts.

Embodiments of the present invention will be described in detail below 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 means of a hydraulic cylinder 12, thereby forming a bucket hoe which can also be used as a dozer and which can carry out earth removal work and ground excavation work.

As shown in FIGS. 1 to 6, 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 second sliding plate 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. The sliding plates 14... are attached, and a hydraulic cylinder 15 for moving the inner arm portion 9a in and out is attached to both arm portions 9.
It is constructed so that the operating locus of the bucket 11 can be changed in order to excavate the bottom of a trench of different depths by extending and contracting the second arm 9 by constructing it between a and 9b, and first and second sliding plates 13,
14, the second arm 9 is configured to be able to extend and contract with little sliding resistance and play.

Further, a mounting bracket 16 for the bucket operating hydraulic cylinder 12 is attached to the upper wall of the inner arm portion 9a.
is provided to protrude upward and on the upper wall of the outer arm portion 9b,
The bracket insertion groove 17 is inserted into the outer arm portion 9.
The inner arm portion 9a is opened at the tip of the outer arm portion 9b.
It is configured such that it can be inserted and assembled while being moved backward from its tip.

The first sliding plate 13... is connected to the inner arm portion 9a.
In order to attach the slide plate 13 to the inner arm portion 9a, a cylindrical locking tool 18 is attached to the inner arm portion 9a to lock and support each slide plate 13 in a manner immovable in the direction of the surface thereof and detachable in a direction perpendicular to the direction of the surface thereof. ... are provided, and bolts 19 and 20 are attached to the upper wall and left side wall of the inner arm portion 9a to press the upper and left ones of each sliding plate 13... toward the outer arm portion 9b, Upper and left sliding plates 13 and bolts 19, 2
0, there is a metal plate-shaped body 21a for pressing the sliding plate,
21b, and furthermore, the rear ends of each sliding plate 13 excluding the upper part are arranged at different positions in the direction of extension and contraction of the arm, so that each first sliding plate Each of the first
The upper and left side of the sliding plates 13 are attached to the outer arm portion 9b by bolts 19 and 20.
By pressing the second arm 9 against the side, the second arm 9 is configured to be able to expand and contract well without play regardless of wear caused by use. for,
When inserting the sliding plate 13 by moving it backward from its tip, assemble the sliding plate 13 sequentially so that the rear end of the sliding plate 13 is located at the rear, so that it is assembled into the locking tool 16 first. The structure is such that both arm portions 9a and 9b can be easily assembled, and the plate-shaped bodies 21a and 21b are
By providing the slide plate 13 with the bolt 19,
20 may cause deformation and damage due to local pressure, or the parts of the sliding plate 13 that are contacted by the bolts 19 and 20 may be locally significantly worn due to contact with the rotating bolt 20. The structure is designed to avoid inconveniences such as damage caused by

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 fixed so that they cannot move in the direction of the surface thereof and in a direction perpendicular to the direction of the surface thereof. Each sliding plate 1 is provided with cylindrical locking tools 22, 22 that are releasably locked and supported, and each sliding plate 1 is provided on the lower wall of the outer arm portion 9b and the frame 23 that is removably bolted to the upper wall.
4. Attach bolts 24, 24 as locking devices for locking and supporting the lower and upper ones of the above so that they cannot move in the direction of the surface and can be removed in a direction orthogonal to the direction of the surface. , outer arm portion 9b
The lower and right side of each sliding plate 14 is attached to the lower and right side walls of the inner arm portion 9.
Bolts 25 and 26 are attached to press the sliding plates 27a and 26, respectively, and between the lower and right sliding plates 14 and 14 and the bolts 25 and 26 that press them, metal plate bodies 27a, 27b, as described in the mounting structure of the first sliding plate 13, the second sliding plate 14 is configured to be installed at low cost and with a simple structure, and is easy to use. The second arm 9 is configured to be able to expand and contract without play regardless of the wear caused by the
The structure is such that damage caused by the sliding plates 14, 14 being pressed by the bolts 25, 26 can be avoided.

In addition, in carrying out the present invention, the locking tool 18 is as follows:
The structure can be changed in various ways, such as using bolts as described in the mounting structure of the second sliding plate 14.

Also, the inner arm portion 9a is replaced with the outer arm portion 9.
b, it may be constructed so that it is inserted and assembled while being moved forward from the proximal end thereof, and in this case, each of the sliding plates 13 except for the upper part thereof may be assembled. The front end portions may be arranged at different positions in the direction of extension and contraction of the arm.

Further, the present invention may be implemented without providing the bolts 19, 20 for pressing the sliding plates 13, 13 against the outer arm portion 9b.

Further, the present invention may be applied to the first arm 7 described in the embodiment. In addition to the backhoe, it may also be applied to the arm of a face shovel.

In summary, the present invention, in the above-mentioned shovel working arm, allows each of the slide plates 13 to be immovably moved in the surface direction of the inner arm portion 9b and detached in a direction perpendicular to the surface direction thereof. A locking tool 18 is provided for locking and supporting the inner arm portion 9a of each of the slide plates 13 except for the upper portion thereof, and the outer arm portion 9
The end portions in the insertion direction when assembled to the arm b are arranged at different positions in the arm extension and contraction direction.

That is, when each sliding plate 13... is attached to the inner arm portion 9a, the movement of each sliding plate 13 in a direction perpendicular to its surface direction is restricted by the inner arm portion 9a and the outer arm portion 9b. By effectively utilizing the fact that it is a
This is achieved by providing a locking tool 18 that locks and supports each of the sliding plates 13 so that they cannot move in the direction of the surface thereof and can be removed in a direction perpendicular to the direction of the surface thereof. Compared to fixing the sliding plate 13 to the inner arm portion 9a using a fixing device such as a bolt, which has been generally done in the past, the sliding plate 13 can be installed more easily and at a lower cost. Moreover, according to the present invention, when the inner arm portion 9a of each sliding plate 13 excluding the upper portion is assembled to the outer arm portion 9b, the end portion in the insertion direction is aligned in the arm extension/contraction direction. Since they are arranged at different positions, the sliding plates 13 whose end portions are located closer to the insertion direction are assembled first, and both arm portions 9a, 9b can be easily assembled.

More specifically, when assembling both arm portions 9a and 9b, there is a risk that the locking members 18... except for the upper one of the sliding plates 13... may come off unexpectedly, for example. , each sliding plate 13...
When the ends of each of the insertion direction sides are located at the same position in the arm extension/contraction direction, one operator must prevent each sliding plate 13 from detaching from the locking tool 18. The assembling work of both arm parts 9a and 9b becomes complicated, such as having another worker perform the operation of inserting the inner arm part 9a while supporting the inner arm part 9a. By sequentially assembling each sliding plate 13 while ensuring that the outer arm part 9b catches the detachment of the sliding plate 13 that will be assembled to the outer arm part 9b, both arm parts 9a and 9b can be assembled by one person It can be done easily.

As a result, a shovel working arm that can be used more favorably as a whole has been achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the shovel work arm according to the present invention, FIG. 1 is a side view of a dozer and backhoe work vehicle, FIG. 2 is a cutaway side view of the second arm,
Fig. 3 is a cutaway side view showing the mounting part of the first sliding plate, Fig. 4 is a vertical cross-sectional rear view of the same part, Fig. 5 is a cutaway side view showing the mounting part of the second sliding plate, and Fig. 6 is a longitudinal cross-sectional rear view of the same part. 9a...inner arm portion, 9b...outer arm portion, 13...sliding plate, 18...locking tool.

Claims (1)

[Scope of utility model registration request] A sliding plate 13 having a plurality of inner arm parts 9a attached in the circumferential direction on the outer surface of the cylindrical outer arm part 9b is slidably fitted into the outer arm part 9b in contact with the inner surface of the outer arm part 9b. The arm for shovel work has the inner arm portion 9a.
, a locking tool 18 is provided for locking and supporting each of the sliding plates 13 so that each of the sliding plates 13 cannot be moved in the direction of the surface thereof and can be detached in a direction perpendicular to the direction of the surface thereof, and each of the sliding plates 13 . The ends of each of the inner arm portions 9a, excluding the upper portion, in the insertion direction when assembled to the outer arm portion 9b are arranged at different positions in the arm extension/contraction direction. An arm for shovel work that is characterized by: