JPH0527553Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a work equipment attachment/detachment device for a construction vehicle.

Conventional technology In the past, many work equipment attachment/detachment devices for quickly attaching/detaching various types of work equipment have been devised.
Publication No. 31659, Publication No. 165003 of Utility Model Application No. 54-165003, Publication No. 31659
There are No. 58-124548 and Japanese Utility Model Application Publication No. 186364/1983.

For example, as shown in Japanese Patent Application Laid-Open No. 55-31659 as shown in FIG. 5, a mail master A is provided at the tip of the lifting device, and a link lever C,
It is known that the working machine E is connected to the mail master A by means of the left and right lock pins B, and the working machine E is connected to the mail master A by means of the left and right lock pins B, B.

Problems that the invention aims to solve However, in this structure, two lock pins B, B are used, and the left and right lock pins B, B and the fluid cylinder device D are connected by link levers C, C, making the structure complicated. The space surrounded by the left and right lift arm hinge plates F, G and the upper and lower cross tubes H, I becomes narrower, making it difficult for the driver to see the rear of the work equipment, resulting in a decrease in work efficiency. Moreover, the structure is complicated and the cost is high.

Means and operation for solving the problem This invention was made in view of the above points, and includes a mail master 1 attached to the tip of a lifting device consisting of a lift arm 41 and a bucket link 42.
In the work equipment attachment/detachment device for attaching and detaching a work equipment such as a bucket 31, the mail master 1 is connected to each lift arm hinge plate 3, 4 on the left and right sides, and the bucket link hinge plate in the center. 6, 7, and two upper and lower cross tubes 2, 5 connected to each of the lift arm hinge plates 3, 4 and the bucket link hinge plates 6, 7, and the bucket link hinge A hydraulic cylinder 21 is provided on the plates 6 and 7 so as to be expandable and retractable in the vertical direction, and a work equipment connecting pin 22 is connected to the tip of the piston rod 21a of the hydraulic cylinder 21.
Two lock plates 10 with holes 12 for attaching and detaching the working machine connecting pin 22 by expansion and contraction of a.
11 are provided on the bucket link hinge plates 6 and 7 at a predetermined interval vertically, and a positioning member 14 is fixed to each of the lift arm hinge plates 3 and 4 or the lower cross tube 5 when the work implement 31 is attached. Established.

Next, the operation of the above configuration will be explained.

First, in order to attach the working machine 31 to the mail master 1, the lift arm 41 and the bucket link 42 are attached.
to hook the hook 32 of the working machine 31 onto the upper cross tube 2 of the mail master 1.

Subsequently, when the mail master 1 is raised while being tilted, the working machine 31 moves around the upper cross tube 2 due to its own weight to the positioning member 1 of the mail master 1.
4 until it comes into contact with the work equipment connecting pin 22.
A bracket 33 fixed to the working machine 31 has a hole 34 for attaching and detaching the lock plate 1.
Inserted between 0 and 11.

At that point, when the piston rod 21a of the hydraulic cylinder 21 is extended, the piston rod 21a
The working machine connecting pin 22 connected to the tip a is inserted into the hole 12 of the two lock plates 10 and 11 and the hole 34 of the bracket 33, so that the working machine 31 is attached to the mail master 1.

To remove the work implement 31 from the mail master 1, operate the lift arm 41 and bucket link 42 to lower the work implement 31, support the work implement 31 on the ground, etc., and remove the piston rod 21 of the fluid pressure cylinder 21.
When the piston rod 21a is contracted, the working machine connecting pin 22 connected to the tip of the piston rod 21a comes out of the hole 12 of the two lock plates 10, 11 and the hole 34 of the bracket 33.

When the lift arm 41 and bucket link 42 are operated to dump the mail master 1 in this state, the hook 32 of the working machine 31 comes off the upper cross tube 2 of the mail master 1.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. In the drawing, 1 is mail master 1, 2 is cross tube, 31 is bucket, 32
is a hook, and 41 is a lift arm, and the mail master 1 is connected to the tip of the lift arm 41 so as to be able to move up and down. A hook 32 provided on the upper back side of the bucket bag 31 is locked to the cross tube 2 of the mail master 1. A hole 3 drilled in a bracket 33 provided at the bottom of the back of the bucket 31
4 is fitted with a work machine connecting pin 22. The left and right lift arm hinge plates 3, 4 are two plates 3a, 3b on each side, as shown in the figure.
4a and 4b, two of which are mounted on one side at an appropriate interval and connected to the lift arm 41. Further, the left and right lift arm hinge plates 3, 4 are connected by two upper and lower cross tubes 2, 5, and bucket link hinge plates 6, 7 are fixedly installed between the upper and lower cross tubes 2, 5,
The bucket link hinge plates 6 and 7 have a first
a hole 8 into which the bucket link 42 shown in the figure is attached;
and a hole 9 into which the bottom 21b side of the fluid cylinder device 21 is attached, guides the movement of the working machine connecting pin 22 moving up and down, and fixes the bracket 33 of the bucket 31 when the working machine connecting pin 22 is fitted. Two upper and lower lock plates 10 and 11 having lock holes 12 are provided. Also,
A protective cover 13 is attached to prevent the fluid cylinder device 21 from being damaged by earth and sand, and bolts 13 are used to attach the cover 13 to bosses 13c welded to the bucket link hinge plates 6 and 7.
a. Use washer 13b. Stoppers 14, 14 are provided inside the lift arm hinge plates 3b, 4b in order to receive the reaction force from the working machine and to prevent the working machine from rattling. The fluid cylinder device 21 is located between the left and right bucket link hinge plates 6 and 7 with the bottom 21b facing upward, and is connected to the bucket link hinge plates 6 and 7 by a pin 23.
It is attached to a hole 9 provided in the. A roll pin 23a is press-fitted into the pin 23, and the cylinder 2
The pin 23 is located between the bottom 21b of the bucket 1 and one of the left and right bucket link hinge plates 6 and 7 to prevent the pin 23 from falling off. It is. A working machine connecting pin 22 is telescopically attached to the piston rod 21a side of the fluid cylinder device 21 using a pin 24. The pin 24 is fixed with a washer 24a and a beta pin 24b so that it does not fall off. As shown in FIG. 4, when the pin 24 is in the upper position, the work equipment connecting pin 22 is removed from the holes 12 of the lock plates 10 and 11, and when the bin 24 is in the lower position, the work equipment is not operated. Machine connection pin 2
2 is shown fitting into the holes 12 of the lock plates 10 and 11.

Effects of the invention As detailed above, the work equipment attachment/detaching device for construction vehicles according to the invention uses a single work equipment connection pin, does not use complicated links, and uses the center of the upper and lower crosstubes that connect the left and right lift arm hinge plates. Since a fluid cylinder device is provided in the section and a link lever is no longer required, the number of parts obstructing visibility in the space surrounded by the left and right lift arm hinge plates and the upper and lower cross tubes is reduced, and forward visibility is improved. That is,
When the working machine 31 is a bucket belt or the like, visibility when the bucket belt is attached is improved, so that the work of attaching and removing the bucket can be facilitated.

In addition, when the work equipment 31 is a fork or the like, the visibility when the fork is attached is improved as well as the visibility during work, so it not only makes it easier to attach and detach the fork, but also improves the workability of the fork. I can do it.

In addition, large forces such as the load of cargo and digging force that act on the work machine 31 are reliably supported by the high-strength positioning members 14 spaced apart at a predetermined distance.
The area around the working machine connecting pin 22, which has low strength, is protected by loose fitting into the insertion holes 12 and 34. Also,
Since the structure is simpler than conventional products, the weight of the mail master is lighter, which has the remarkable effect of improving the stability of the vehicle.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of this invention; Fig. 2 is a side view of the tip of the unloading device of a construction vehicle, Fig. 2 is a perspective view of the main part, and Fig. 3 is a cross section taken along line A-A in Fig. 2. FIG. 4 is a partial perspective view of the working machine connecting pin showing how it is fitted and removed. FIG. 5 is a perspective view of a conventional work implement attachment/detachment device. 1 is mail master, 2 and 5 are cross tubes,
3, 4 are lift arm hinge plates, 10, 1
1 is a lock plate, 21 is a cylinder, and 22 is a work machine connection pin.

Claims (1)

[Scope of utility model registration request] Mail master 1 attached to the tip of a lifting device consisting of a lift arm 41 and a bucket link 42
In the work equipment attachment/detachment device for attaching and detaching a work implement such as a bucket 31, the mail master 1 is connected to each of the lift arm hinge plates 3 and 4 on the left and right sides, and the bucket link hinge plate in the center. 6, 7, and two upper and lower cross tubes 2, 5 connected to each of the lift arm hinge plates 3, 4 and the bucket link hinge plates 6, 7, and the bucket link hinge A fluid pressure cylinder 21 is provided on the plates 6 and 7 so as to be able to expand and contract in the vertical direction, and a work equipment connecting pin 22 is connected to the tip of the piston rod 21a of the fluid pressure cylinder 21.
Two lock plates 10 with holes 12 for attaching and detaching the working machine connecting pin 22 by expansion and contraction of a.
11 are provided on the bucket link hinge plates 6 and 7 at a predetermined interval vertically, and further a positioning member is fixed to each of the lift arm hinge plates 3 and 4 or the lower cross tube 5 when the work implement 31 is attached. A work equipment attachment/detachment device characterized by: