JP2574516Y2 - Gripping fork device for excavator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided gripping fork device used as an attachment for a power shovel.

[0002]

2. Description of the Related Art Conventionally, as a double-opening gripping fork device, one disclosed in Japanese Utility Model Laid-Open No. 1-78682 filed by the present applicant is known.

[0003] This conventional apparatus has a base mounted on a tip of a boom of a power shovel, and bases of a pair of forks are independently supported on the base, and a base of a strap is mounted on the boom. One end of the push link is axially mounted on one end of the push link, the other end of the push link is connected to the end of the strap, and the end of the push cylinder is connected. It was the structure which was done.

The conventional device is mounted by fixing the base portion to the tip of the boom at two locations and connecting the other end of the push link to the tip of the strap, so that a total of three locations are provided. Had been stopped.

[0005]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional apparatus, there is a problem that a lot of labor is required for the mounting and dismounting work because the mounting is stopped at three places.

The present invention has been made in view of the above-mentioned problems, and the attachment and detachment work is simplified by stopping the attachment at two places, and the opening and closing of both forks is synchronized by simple means. An object of the present invention is to provide a gripping fork device for a power shovel capable of performing the above-described operations.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a gripping fork device for a power shovel according to the present invention is provided. The base end of the fork is coaxially supported by the end of the boom of the power shovel, one end of the push link is supported by the one fork, and one end of the strap is supported by the boom. An end and the other end of the push link are coaxially connected to a tip of a push cylinder, a base end of the other fork is pivotally supported by a base end of the one fork, and a base of the other fork. The end is connected to the opening frame by a swing link.

[0008]

The gripping fork device for a power shovel of the present invention has the base end of one of the forks and the middle portion of the open leg frame coaxially supported at the boom tip of the power shovel.
A total of two stops, one at the shaft support and one at which the push link is supported on one fork, are attached. Accordingly, when the gripping fork device is mounted, the other attachment is removed while the push link is left as it is on the boom. Then, after the open leg frame of the gripping fork device and one of the forks are coaxially supported at the end of the boom, the push link can be attached to the one fork by simply connecting the push link to the one fork. For this reason, compared with the conventional three-point stopper, it is possible to perform the same operation as the exchange of the buckets, and the attaching and detaching work becomes very simple.

Next, the opening and closing operation of both forks will be described. The opening and closing of both forks is performed by the advance and retreat of a push cylinder, and the operation of the push cylinder causes one of the forks to move at the tip of the boom via a push link. Open and close around the pivot. At this time, the distal end of the base end of the one fork also rotates about the pivot at the end of the boom. In the other fork, the base end portion follows the rotation locus of the base end portion of one fork. At this time, since the swing link supports the base end of the other fork in the swing state, the other fork is set in substantially the same state as the one fork while using the pivot with the swing link as the center of rotation. Can be opened and closed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are side views of a gripping fork device for a power shovel according to the present embodiment. FIG. 1 shows a state where the fork is closed, and FIG. 2 shows a state where the fork is open. FIG. 3 is a plan view showing a gripping fork device for a power shovel, and FIG.
FIG. 5 is a plan view showing the upper fork, FIG. 5 is a rear view showing the lower fork, and FIG. 6 is an explanatory diagram showing a pivotal connection between the upper fork and the open leg frame.

In the drawing, reference numeral 1 denotes an intermediate boom of a power shovel, which has an upper fork 2 and an open leg frame 3 at its tip.
Is installed. One end of the strap 10 has a pin 1 at a position slightly closer to the base end than the front end of the intermediate boom 1.
It is supported by 1.

The base end of the upper fork 2 has a bearing 20
a, and a bearing portion 3 provided at an intermediate portion of the open leg frame 3.
Along with Oa, it is coaxially supported by the pin 20 at the tip of the intermediate boom 1. The upper fork 2 is formed such that its base end is curved inward, and a bearing 21 is provided at the base end. The bearing 21 is provided with the pin 2
It is arranged at a position that is angled inward from the position of the zero bearing part 20a. A bracket 22 protrudes from the outer surface at a position near the base end. The bracket 22 includes
One end of the push link 12 is pivotally supported by the pin 13 when mounted on the intermediate boom 1. The other end of the push link 12 and the other end of the strap 10 are coaxially connected to the tip of a push cylinder 14 by a pin 15.

The open leg frame 3 is provided with a lower fork 4 described later.
Is rotatably held via the swing link 5, and a shaft support portion of the intermediate boom 1 by the pin 20 is defined as an intermediate portion 30, and the intermediate portion 30 has a bearing portion 30 a for the pin 20. Upper leg 31 and lower leg 3 with bearing 30a as a boundary
2 are arranged in a state where the legs are opened at a predetermined angle. At the distal ends of the upper leg 31 and the lower leg 32, a holding portion 3 is provided to face the upper surface and the lower surface of the intermediate boom 1 respectively.
3a and 33b are provided. And the upper leg 31
Has an adjusting means 35 formed so as to be connected by a pin 34 at a position close to the bearing 30a and to adjust the holding state with the intermediate boom 1 by moving the holding section 33a forward and backward. The adjusting means 35 includes a male screw 35b rotatably held on a swing seat 35a axially mounted on the holding portion 33a.
And a trunnion-type internal thread 35c to which the external thread 35b is screwed and which is axially attached to the intermediate portion 30 side. One end of the swing link 5 is pivotally supported by a pin 36 at a position of the lower leg 32 near the holding portion 33b.

Reference numeral 4 denotes a lower fork. The lower fork 4 also has a distal end portion curved inward in the same manner as described above, and a base end portion of the lower fork 4 A bearing portion 41 is provided at the other end side, and a bearing portion 41 is provided at a distal end portion of the base portion. The bearing portion 41 is also disposed at a position that is angled inward from a position supported by the pins 40.

The upper fork 2 has two claws arranged side by side with a space therebetween, and the lower fork 4 has three claws arranged side by side with a space therebetween. It is formed so that the claw of the upper fork 2 is located inside.

In the gripping fork device for a power shovel according to the present embodiment, the upper fork 2 pivotally supported by the pin 20 on the intermediate boom 1 and the open leg frame 3 maintain the assembled state even when the pin 20 is not inserted. The boom 1 is formed so that it can be easily attached even if the tip width of the boom 1 is various. That is, a boss 20 b is provided inside the bearing 20 a of the upper fork 2, and the bearing 30
A boss portion 30b having the same outer diameter as that of the boss portion 20b and having a half width of the width of the boss portion 20b is provided outside the portion a. A sleeve 23 having an inner diameter substantially the same as the outer diameter of the bosses 20b, 30b and a width substantially the same as the width of the boss 20b.
Is mounted on the side of the boss 30b, and at this time, a split ring 24 having substantially the same width as the boss 30b is mounted in a space 20c formed on the side of the boss 20b. The split ring 24 is formed in a ring shape by tightening and fixing a semi-circular shape with a bolt 25.

The inner dimensions of the bearings 30a, 30a are formed appropriately wider than the tip width of the intermediate boom having the largest dimension in a power shovel to which the capacity of the fork gripping device is mounted. . A bush 26 having a flange 26a is fitted to each of the bearing portions 30a. The flange 26a is formed to have substantially the same width as the gap 27 formed between the intermediate boom 1 and the gripping fork device.

Next, the operation of the embodiment will be described. First, the opening and closing operation of the forks 2 and 4 will be described. The opening and closing of the two forks 2 and 4 is performed by the advance and retreat of the push cylinder 14. The advance operation of the push cylinder 14 causes the upper fork 2 to be closed from the open state through the push link 12 as shown in FIG. .

At this time, the pin 42 that supports the base end of the upper fork 2 and the base end of the lower fork 4 pivots about the pin 20 that supports the upper fork 2 on the intermediate boom 1. Move over the top. Therefore, the lower fork 4 moves so that the base bearing 41 moves on the rotation locus K1 with the pin 40 provided on the swing link 5 as a fulcrum. It will open and close with. In this case, since the rotation trajectory K1 of the lower fork 4 is a trajectory convex toward the lower fork 4, the pin 40 moves back and forth on the rotation trajectory K2 around the pin 36. The fork 4 will be supported.

Next, the operation when the present gripping fork device is mounted on a power shovel will be described. The lower fork 4 is attached to the open leg frame 3 via the swing link 5 and the upper fork 2
First, the sleeve 23 is attached to the boss 2 of the upper fork 2.
The sleeve 23 is moved toward the boss portion 30b by aligning the boss portion 30b of the open leg frame 3 with the sleeve 23 inserted into the space 23b, and is divided into two by a space 20c formed at the trace of the movement of the sleeve 23. The ring 24 is attached to the open leg frame 3 by tightening bolts. next,
The intermediate boom 1 of the power shovel is inserted between the upper leg portion 31 and the lower leg portion 32 of the open leg frame 3, and the bearing portions 30a, 30
The ends of the intermediate boom 1 are made to coincide with each other. In this case, the width of the tip of the intermediate boom 1 and the bearing portions 30a,
When the inner widths of the 30a do not match each other, a bush 26 having a flange 26a formed according to a gap 27 formed between the tip width and the inner width is used. Then, the upper fork 2, the lower fork 4, and the open leg frame 3 are simultaneously mounted on the intermediate boom 1 by inserting the pins 20 from the bearing portion 20 a side of the upper fork 2. Thereafter, the adjusting means 3
By turning the fifth male screw 35b to press the holding portions 33a and 33b against the upper surface and the lower surface of the intermediate boom 1 respectively, the open leg frame 3 is fixed. Next, push cylinder 1
4 is moved forward and backward, and one end of the push link 12 is connected to the bracket 21 of the upper fork 2 by the pin 13 to complete the mounting of the grasping fork device to the intermediate boom 1.

As described above, in the gripping fork device for a power shovel according to the present embodiment, the pin 20 for coaxially supporting the upper fork 2 and the open leg frame 3 on the intermediate boom 1 is provided.
Then, the push link 12 can be attached to the intermediate boom 1 of the power shovel by two pins 13 that support one end of the push link 12 to the bracket 21 of the upper fork 2. Therefore,
It becomes very simple compared to the conventional three-point stop. Further, it is not necessary to remove the push link, and the attachment / detachment work can be performed safely and in a single time. Even when the pin 20 for supporting the upper fork 2 and the open leg frame 3 coaxially with the intermediate boom 1 is pulled out, the upper fork 2 and the open leg frame 3 are not separated from each other. Easy to do and split ring 2
The upper fork 2 and the open leg frame 3 can be easily separated simply by removing the sleeve 4 and displacing the sleeve 23. The inner dimension of the bearing portions 30a of the open leg frame 3 is changed by changing the width of the flange 26a of the bush 26.
Without limiting to a specific type of gripping fork device,
It is possible to cope with various widths of the intermediate boom to be mounted, which is very economical.

The embodiment of the present invention has been described above.
The specific configuration of the present invention is not limited to this embodiment, and even a design change or the like within a range not departing from the gist of the present invention is included in the present invention. For example, the shapes of the two forks and the number of claws can be arbitrarily set.

The structure of the holding means adjusting means 35 provided on the open leg frame 3 can be set arbitrarily.

[0024]

As described above, in the gripping fork device for a power shovel of the present invention, as described above, the open leg frame supporting the other fork via a swing link and one fork are coaxial. Since it is pivotally supported, it can be mounted on a power shovel simply by pivotally supporting two places together with the connection of the push link. Since the push link attached to the boom of the power shovel is used as it is, there is no need to remove the push link, and the attachment / detachment operation can be performed safely and easily. With such a simple structure that the opening and closing means for one fork and the other fork can be opened and closed through a swing link, it is possible to obtain an effect that both forks can be opened and closed in synchronization.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a fork of a gripping fork device for a power shovel of an embodiment is closed.

FIG. 2 is a side view showing a state where the fork of the power shovel gripping fork device is opened.

FIG. 3 is a plan view showing a state where the fork of the power shovel gripping fork device is closed.

FIG. 4 is a plan view showing the upper fork of the above.

FIG. 5 is a rear view showing the lower fork;

FIG. 6 is an explanatory diagram showing a pivotally connected portion between the upper fork and the open leg frame according to the first embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Intermediate boom of a power shovel 2 Upper fork (one fork) 3 Open leg frame 4 Lower fork (the other fork) 5 Swing link 10 Strap 11 Pin for supporting a strap 12 Push link 13 Supporting a push link Pin 14 Push cylinder 15 Pin for supporting the push link and the strap to the push cylinder 20 Pin for supporting the upper fork and the open leg frame coaxially 30 Intermediate portion of the open leg frame 31 Upper leg portion of the open leg frame 32 Open Lower leg portion of the leg frame 36 A pin for pivotally supporting the swing link to the open leg frame 40 A pin for pivotally supporting the lower fork to the swing link

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 3/36 B25J 15/08 B66C 1/68

Claims (1)

(57) [Scope of request for utility model registration] 1. A middle part of an open leg frame for holding a boom tip of a power shovel between both legs and a base end of one fork are coaxially supported by a boom tip of the power shovel, and one end of a push link is connected to one end of a push link. One end of the strap is pivotally supported by the one fork and one end of the strap is pivotally supported by the boom, and the other end of the strap and the other end of the push link are coaxially connected to the tip of a push cylinder. A power excavator, wherein a base end of the fork is pivotally supported by a base end of the one fork, and a base of the other fork is connected to the open leg frame by a swing link. Grab fork device.