JP2558244B2 - Attachment coupler - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment coupler mounted between an arm and an attachment for facilitating attachment / detachment and replacement of various attachments attached to the tip of an arm such as a hydraulic excavator.

[0002]

2. Description of the Related Art A variety of work machines such as buckets and breakers are attached to a base machine that has a basic function such as a hydraulic excavator to attach a so-called attachment to expand the usage and improve the work efficiency and the operating rate of the base machine. It is now widely practiced to improve. In particular, a hydraulic excavator having an arm, a boom, a turning device, and the like can operate like a manipulator, and is therefore widely used not only as a construction machine but also in other industries. In addition, it is widely practiced that a single machine advances work while exchanging various attachments such as buckets according to the work process. In this case, the efficiency of attachment replacement work in the overall work efficiency is
Very big. Therefore, in order to improve the efficiency of this replacement work, many attachment couplers have been conventionally proposed.

For example, the arm hole (3
2) and the other side of the base body (31) having the link hole (33) are provided with a hook (35) for engaging with the attachment pin (34) of the attachment, and on the other side, a link (with a hook (36) at the tip ( Axis (38) sharing 37) with link hole
It is rotatably provided with the fulcrum as a fulcrum, and the attachment is detachable by adjusting the distance between both hooks by adjusting the screw (39). In addition, the one shown in FIG. 7 has links (41) and (41) each having a hook (40) which engages with the attachment pin (34) of the attachment at the tip thereof.
It is rotatably supported by 2) and the attachment is detachable by adjusting the screw (43).

In general, attachments such as hydraulic excavators, except for special ones, have a structure in which they are rotatably attached to the tip of an arm with attachment pins and are rotated within a certain range by expansion and contraction of a cylinder via a link. The angle of this rotation should be as large as possible in view of the nature of the work. For example,
In addition to excavating and transporting earth and sand, the most frequently used buckets perform leveling work on horizontal and slope surfaces.In this case, the larger the return angle is, the better the accuracy and efficiency of the work as well as the scraping angle. Is advantageous over. On the other hand, if this angle is too large, the attachment such as a bucket may come into contact with the arm of the hydraulic excavator. Therefore, in the attachment such as a bucket, in order to keep this rotation angle optimum, the interval between the arm hole and the link hole that affects this angle is set to the optimum dimension.

[0005]

However, in the conventional attachment coupler, the distance between the arm hole and the link hole is fixed as seen in the above-mentioned conventional example, so that the optimum distance peculiar to the attachment such as the bucket is provided. In some cases, a difference may occur, and a sufficient rotation angle cannot be obtained, or conversely, the rotation angle is too large and the attachment comes into contact with the arm. Also, in the other conventional example, the distance between the arm hole and the link hole changes only slightly, and the distance between the attachment directly on the arm and the distance between the attachment via the attachment coupler does not match. In the same manner, inconvenience occurred. Therefore, an object of the present invention is to provide an attachment coupler in which the distance between the attachment holes of the attachment such as a bucket and the distance between the attachment holes of the arm of the hydraulic excavator can be made almost always equal.

[0006]

According to the present invention, there is provided a first link having an arm hole (2) attached to an arm (26) such as a hydraulic excavator at one end and a hook (3) opening outward at the other end. (1) and a link (27) such as a hydraulic excavator at one end
A second link (4) having a link hole (5) to be attached to the other end and a hook (6) opening to the outside at the other end is crossed with each other, and is rotatably supported via a support shaft (9), Both links are biased via a compression spring (20) in such a direction that the distance between the shaft centers of the hooks of the links (1) and (4) crossing each other approaches, and, for example, a female screw member provided on the second link. (1
The above problem cannot be solved by adjusting the distance between the shaft cores of the hooks (3) and (6) by adjusting the adjusting device (14) consisting of 1) and the male screw (12) inserted therethrough. It is what

[0007]

The operation of the attachment coupler of the present invention having the above-mentioned structure will be described. When the male screw (12) of the adjusting device (14) is loosened, the compression spring (20) extends and each link (1), (4). Rotates about the support shaft (9), and the distance between the shaft centers of the hooks (3) and (6) becomes shorter (see FIG. 4A). One of the attachment pins (24) of the attachment (23) is inserted into one hook (6), and the other attachment pin (2) is inserted into the opening of the other hook (3).
5) is set and the male screw (12) is tightened, both links rotate and the distance between the hook shaft centers increases (Fig. 4).
(See (B)), the attachment is fixed to this attachment coupler. Further, at this time, since both links are attached so as to intersect with each other via the support shaft (9), the distance between the shaft centers of the hooks (3) and (6) and the arm hole (2) of the attachment coupler are linked. The distance is substantially the same as the distance of the hole (5), and the rotation angle α of the attachment is almost the same as that when the attachment is directly attached to an arm such as a hydraulic excavator without a coupler (see FIG. 5).

[0008]

Embodiments of the present invention will now be described with reference to the drawings. In the drawings, (1) is a first link, and one end thereof has an arm hole (2) to be attached to an arm (26) such as a hydraulic excavator. , (2) are provided, and the other end has a mounting pin (25) for an attachment (23) such as a bucket.
An outwardly opening hook (3) for locking the is provided. Further, (4) is a second link, one end of which is provided with a link hole (5), (5) for attaching to a link (27) such as a hydraulic excavator.
And the other end is provided with a hook (6) which is open to the outside to lock the attachment pin (24) of the attachment (23). The first link (1) and the second link (4) intersect with each other, and the support bearing (7) is provided substantially at the center of the first link.
And a support bearing (8) provided substantially in the center of the second link,
It is rotatably connected by a support shaft (9) via (8).

A female screw member (11) is installed between both side plates (10), (10) from the hook (6) of the second link (4), and a male screw (12) is inserted through the female screw member (11). The tip of the male screw is brought into contact with the pin (13) installed below the support bearing (7) of the first link (1) to form an adjusting device (14), and the shaft cores of the hooks (3) and (6) are formed. The distance between them can be adjusted. Also, the side plate (1) from the hook (3) of the first link
The pin (16) is erected on 5), the pin (18) is erected on the side plate (17) from the link hole (5) of the second link, and the pin can be rotated between both pins about each pin. A compression spring (20) is stretched through a spring seat (19) to urge the compression spring (20) in such a direction that the distance between the shaft centers of the hooks of the links (1) and (4) crossing each other becomes closer, and a male screw is always used. Make sure the tip of is in contact with the pin (13). Note that the adjusting device is not limited to this, and a known device that can adjust the distance between the axes of the hooks can be applied.

Then, for example, when the male screw (12) of the adjusting device (14) is loosened, as shown in FIG. 4 (A),
The compression spring (20) extends and both links rotate about the support shaft (9), and the distance between the axes of the hooks (3) and (6) becomes shorter. When the male screw (12) is tightened, the tip of the male screw (12) presses the pin (13) and both links rotate about the support shaft (9), the compression spring is compressed, and as shown in FIG. The distance between the axes becomes longer. Therefore,
By properly adjusting the male screw (12), it becomes possible to mount various attachments having different mounting pin intervals depending on their functions. In this case, since the position of the support shaft (9) is selected according to the shape of the link, the distance between the axes of the hooks (3) and (6), the arm hole (2) at the other end, and the link. The distance between the shaft cores of the holes (5) is substantially the same, and the attachment (23) can be mounted with the same distance between the shaft cores as in the case of directly mounting the arm, and the rotation angle of the attachment can be optimally held.

Reference numeral (21) is a safety pin that is inserted into the tip of the hook, and is a mounting pin (2) for the attachment.
After locking 4) and (25) to the hook, the safety pin (2
By inserting 1) from the inside of the hook and fixing it with the beta pin (22), the distance between the axes of the hooks is narrowed due to loosening of the male screw, etc., and the attachment is prevented from falling off.

[0012]

As described above, in the attachment coupler according to the present invention, various attachments can be easily attached / detached and exchanged only by adjusting an adjusting device such as a male screw, so that the efficiency of attachment exchange work is improved. As a result, it greatly contributes to the improvement of the overall work efficiency. Also, since both links can be crossed and the distance between the axis of the arm hole to attach to the hydraulic excavator and the axis of the link hole can be made almost equal to the distance between the axes of the hooks to which the attachment is attached, the rotation angle of the attachment can be changed. The angle can be the same as when it is attached directly to the arm. Therefore, the work performance of the bucket or the like can be utilized to the maximum extent, and the inconvenience such as the attachment coming into contact with the arm does not occur.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an attachment coupler according to the present invention.

FIG. 2 is a plan view of an attachment coupler according to the present invention.

FIG. 3A is a plan view of a first link, and FIG. 3B is a plan view of a second link.

FIG. 4 is an explanatory view of the operation, in which (A) is a vertical cross-sectional view in which the male screw is loosened to shorten the distance between the shaft cores of the hook, and (B) is the male screw tightened to reduce the distance between the shaft cores. It is a longitudinal cross-sectional view of the expanded state.

FIG. 5 is a usage state diagram of the attachment coupler.

FIG. 6 is a front view showing an example of a conventional technique.

FIG. 7 is a front view showing an example of another conventional technique.

[Explanation of symbols]

 1 1st link 2 Arm hole 3 Hook 4 2nd link 5 Link hole 6 Hook 9 Spindle 14 Adjustment device 20 Compression spring

Claims (1)

(57) [Claims] 1. A first link (1) having an arm hole (2) at one end and a hook (3) opening outward at the other end,
A second link (4) having a link hole (5) at one end and a hook (6) opening at the other end is crossed with each other,
It is rotatably supported via a support shaft (9), and an adjusting device (1
Attachment coupler characterized in that the distance between the shaft centers of the hooks (3) and (6) can be adjusted by 4).