JPS6111330Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention involves inserting the inner arm part into the cylindrical outer arm part so as to be able to slide freely by inserting the end of the inner arm part into the outer arm part, and also inserting a sliding plate between the two arm parts. This invention relates to an interposed shovel working arm.

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 shovel work arm having the above advantages, the sliding plate mounting structure is constructed to be inexpensive, simple, and easy to assemble.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative 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 rolling base 4 is moved by a hydraulic motor (see FIG. The bracket 5 for supporting the first arm is attached to the swing table 4 so that it can be rotated around the vertical axis X ₁ by means of a hydraulic cylinder ₆ (not shown). , the first arm 7 is attached to the bracket 5 so as to be operable up and down by a hydraulic cylinder 8, the second arm 9 is attached to the first arm 7 so as to be operable to swing up and down by a hydraulic cylinder 10, A bucket 11 is attached to the second arm 9 so as to be swingable by 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 5, the second arm 9 includes a rectangular cylindrical inner arm portion 9a having a bucket 11 attached to its tip, and a proximal end thereof pivoted to the first arm 7. square tubular outer arm portion 9b
The outer arm portion 9b is slidably fitted into the inner arm portion 9a, and the outer arm portion 9b is slidably fitted into the inner arm portion 9b.
A first sliding plate 1 made of synthetic resin that comes into contact with the inner surface of the
3. Attach the tip 4 of the outer arm portion 9b.
A second sliding plate 14 made of synthetic resin that comes into contact with the outer surface of the inner arm portion 9a is attached to each side surface, and a hydraulic cylinder 15 for moving the inner arm portion 9a in and out is attached to both arms. part 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 The structure is such that the second arm 9 can be expanded and contracted with little sliding resistance and play by the first and second sliding plates 13 and 14 that are locally positioned in the longitudinal direction of the arm.

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.
, a cylindrical frame 18 that locks and holds each sliding plate 13 on the inner arm portion 9a so that it cannot move in the direction of the surface thereof and can be removed in a direction perpendicular to the direction of the surface thereof. and the inner arm part 9
Attach bolts 19 and 20 for pressing the upper and left side of each sliding plate 13 toward the outer arm portion 9b to the upper and left side walls of a, and attach the bolts 19 and 20 to the upper and left side walls of 13 and bolt 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 except for 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 one and the left one of the sliding plates 13... are attached to the outer arm part 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 plates 13 while moving them rearward from the tip, the sliding plates 13 are assembled in sequence, with the rear end of the sliding plate 13 located at the rear being assembled to the frame 18 first. ,
It is structured so that both arm parts 9a and 9b can be easily assembled, and by providing the plate-shaped bodies 21a and 21b, the sliding plate 13 is attached to the bolts 19 and 2.
Deformation and damage may occur due to being locally pressed at 0, and portions of the sliding plate 13 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.
, the left and right slide plates 14 are attached to the left and right side walls of the outer arm portion 9b so that they cannot move in the direction of the plane and in a direction perpendicular to the plane. Cylindrical frames 22, 22 are provided to be removably locked and supported, and the upper one of each sliding plate 14 is attached to a frame 23 that is removably bolted to the upper wall of the outer arm portion 9b. A bolt 23a is attached to the bottom wall of the outer arm portion 9b, and a bolt 23a is attached to the bottom wall of the outer arm portion 9b to lock and support the bolt 23a immovably in the direction of the surface thereof and irremovably in the direction perpendicular to the direction of the surface thereof. An arm portion 9 holds a cylindrical frame 24 that locks and supports an object so that it cannot be moved in the surface direction and can be removed in the vertical direction.
b, so that it can be inserted into and removed from it along its longitudinal direction, and is fixed using a bolt 29 to a tongue piece 28 that projects downward from the tip of the bottom wall, and the outer arm portion Bolts 25 and 26 for pressing the lower and right side of each slide plate 14 towards the inner arm portion 9a are attached to the bottom wall and the right side wall of 9b, and the lower and right side Metal plate bodies 27a, 27b for pressing the sliding plates are interposed between the sliding plates 14, 14 and the bolts 25, 26 that press them, so that the mounting structure of the first sliding plate 13... As mentioned above, the second sliding plate 14 is constructed so that it can be installed at low cost and with a simple structure, and the second arm 9 can be expanded and contracted without play, regardless of the wear that accompanies use. Furthermore, the sliding plate 14,1
4 is configured to avoid damage caused by being pressed by the bolts 25 and 26.
In addition, by holding the lower sliding plate 14 in the cylindrical frame 24, no interference occurs when inserting the tip of the inner arm portion 9a into the outer arm portion 9b and fitting it inside. The sliding plate 1 is to be removed as shown in FIG.
4, the cylindrical frame 24 is attached to the outer arm portion 9b.
The structure is such that it can be easily carried out by simply moving it along its longitudinal direction, inserting it into a predetermined position, and fixing it. In addition, the left and right sliding plates 14 attached to the outer arm portion 9b,
14 is vertically offset with respect to the left and right sliding plates 13, 13 attached to the inner arm portion 9a so as not to cause interference when inserting the inner arm portion 9a.

In order to adjust the position of the sliding plate 14 attached to the bottom wall of the outer arm part 9b in the distance direction with respect to the inner arm part 9a, as shown in FIG. A shim 30 may be interposed between the arm portion and the bottom wall.

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. As the arm portions 9a and 9b, various shapes such as a hexagonal shape as well as a square shape can be used.

In summary, the present invention provides the above-mentioned shovel working arm in which the sliding plates 13 and 14 are distributed and positioned circumferentially on the outer surface of the proximal end of the inner arm portion 9a and the inner surface of the distal end of the outer arm portion 9b. At the same time, the cylindrical frame 24 holding the sliding plate 14 attached to the bottom wall of the outer arm portion 9b is attached to the outer arm portion 9b.
It is characterized in that it is attached so that it can be inserted and removed along its longitudinal direction.

That is, since the sliding plates 13 and 14 are installed in a circumferentially distributed manner on the outer surface of the proximal end of the inner arm portion 9a and the inner surface of the distal end of the outer arm portion 9b, for example, the sliding plates 13 and 14 are attached to the inner arm. Compared to mounting the sliding plates 13 and 14 on the outer surface of the portion 9a or the inner surface of the outer arm portion 9b over the entire length thereof and distributing them in the circumferential direction, the required amount of the sliding plates 13 and 14 is reduced. can be constructed easily and inexpensively. Particularly, according to the present invention, the cylindrical frame 24 holding the sliding plate 14 attached to the bottom wall of the outer arm portion 9b can be inserted into and removed from the outer arm portion 9b along its longitudinal direction. By attaching the inner arm portion 9a, when inserting the inner arm portion 9a into the outer arm portion 9b with the tip thereof partially inserted into the inner arm portion 9b, the inner arm portion 9a
After inserting the inner arm part 9a, the sliding plate 14 attached to the bottom wall of the outer arm part 9 can be assembled by moving the cylindrical frame 24 to the outside. This can be done by simply moving the arm portion 9b along its longitudinal direction, inserting it into a predetermined position, and fixing it, and the sliding plate 14 can be supported firmly, which is practical. The advantages are huge.

More specifically, when attaching the sliding plate 14 to the bottom wall of the outer arm portion 9b, the outer arm portion 9b
There is a method of providing a bolt passing through the bottom wall of b from below to above and engaging the protruding end of this bolt with a hole formed in the sliding plate 14, but in this case,
The operation of moving the sliding plate 19 to align the holes and bolts is cumbersome and difficult to assemble, and the supporting strength tends to be insufficient.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the shovel working arm according to the present invention, with FIG. 1 being a side view of a dozer and backhoe working vehicle, FIG. 2 being a partially cutaway side view of the second arm, and FIG. 4 is a longitudinal rear view showing the mounting portion of the first sliding plate, FIG. 5 is a longitudinal rear view showing the mounting portion of the second sliding plate, FIG. 5 is a perspective view of the cylindrical frame, and FIG.
The figure is a cutaway side view of another embodiment. 9a...inner arm portion, 9b...outer arm portion, 13, 14...sliding plate, 24...cylindrical frame.

Claims (1)

[Scope of utility model registration request] The inner arm portion 9a is slidably fitted into the cylindrical outer arm portion 9b by inserting the inner arm portion 9b with its tip partially inserted, and both arm portions 9a,
A shovel working arm in which sliding plates 13 and 14 are interposed between the sliding plates 13 and 14.
are attached to the outer surface of the base end of the inner arm portion 9a and the inner surface of the tip end of the outer arm portion 9b in a circumferential direction, and the cylinder holds the sliding plate 14 that is attached to the bottom wall of the outer arm portion 9b. A shovel working arm characterized in that a shaped frame body 24 is attached to the outer arm portion 9b in a manner that it can be inserted into and removed from the outer arm portion 9b along its longitudinal direction.