JPH0140907Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a dismantling fork assembly that is attached to the tip of a boom of a civil engineering machine, etc., and particularly relates to an arm that is connected to a boom of a civil engineering machine and a fork assembly that is attached to the tip of an arm. The present invention relates to a dismantled fork assembly in which a fork opening/closing hydraulic cylinder and a fork opening/closing hydraulic cylinder built into an arm are constructed as an integral assembly, and a rotary joint having a rotation locking function is provided in the middle of the arm.

[The problem that the idea attempts to solve]

Conventional demolition forks have a structure that attaches to and detaches from the arm or link of civil engineering equipment as a tip attachment, so if the civil engineering machine is of a different manufacturer or model, it may not be able to perform the specified opening/closing operation. Furthermore, the gripping motion of conventional demolition forks is fixed in the vertical or horizontal direction, so the working direction is limited.

Further, since the conventional demolition fork is pivotally attached to the arm so as to be able to swing up and down, if a strong rotational force is applied to the work center attachment part, the pivot attachment part tends to be damaged. In order to prevent this, there is a device as disclosed in Japanese Unexamined Patent Publication No. 55-5701 in which a rotating joint part such as an overload latch is provided near the fork attachment pivot part, but it is an overload clutch. Therefore, if you try to bend a pillar etc. that you have grabbed, it will only make you bend down and it will be useless.

This invention consists of a fork structure, an arm, and a fork opening/closing cylinder as an integrated assembly, and can be installed on any type of civil engineering machine by simply connecting it to the boom and swing cylinder of the civil engineering machine, and can change the operating direction of the fork. To provide a fork assembly for disassembly that allows work and does not damage a fork pivot part.

[Means to solve the problem]

The purpose of the present invention is to provide a pair of links 8a, 8 at the tip.
The front arm 1a is equipped with a fork structure 2 that can be opened and closed at b, and the rear arm 1b is provided with the boom connection part 16 of the civil engineering machine main body and the swing cylinder connection part 17 at the rear. They are connected via a self-retentive rotary joint 3 by complementary fitting of the steps, and are removably fitted into the perforation 9 between the flanges of the rotary joint 3 and into this perforation 9. A lock mechanism is provided which disables rotation of the joint by engagement of a lock pin 4, and a cylinder tube 5' of a hydraulic cylinder 5 is attached to the rear arm 1b.
At the same time, the piston rod 6 of the hydraulic cylinder 5 is passed through the center of the rotating joint 3 and its tip is connected to the link shaft 7 of the fork structure 2. This can be achieved by a dismantling fork assembly characterized by being slidably supported in guide holes 14, 14 formed in the axial direction of the arm 1.

[Example of idea]

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, an arm 1 of the dismantling fork assembly according to the present invention is connected to a front arm 1a having a fork structure 2 pivotally attached to its tip, and a civil engineering machine body boom (not shown). rear arm 1
1b, and the intermediate joint 3 is rotatably connected by engaging and detaching the engaging pin 4, and a hydraulic cylinder 5 is attached in the axial direction inside the frame of the arm 1, and the tip of the piston rod 6 of the cylinder 5 is attached. A pair of upper and lower links 8a and 8b of the fork structure 2 are pivotally connected to a shaft 7 provided in the fork member 2.

The structure of the intermediate joint 3 is as shown in FIG.
b' is formed into a stepped hollow flange with an uneven cross section that meshes with each other, and by complementary fitting these mutual uneven steps, the front arm 1a and A hole 9 is provided in the overlapping flange portions 1a' and 1b' of the rear arm 1b, and an engagement pin 4 is removably fitted into the hole 9 to lock the rotation of the joint portion 3. .

A guide sleeve 10 having an enlarged diameter hollow portion inside is fixed to the outside of the flange on the engagement pin insertion side (flange 1a' of the front arm 1a in the example shown). The outer periphery of the shaft of the engaging pin 4 facing the engagement pin 4 is reduced in diameter, and a coil spring 11 is fitted between the enlarged diameter stepped portion 10' of the guide sleeve 10 and the reduced diameter stepped portion 4' of the engaged pin 4.

When the centers of the holes in the flanges 1a' and 1b' are aligned, the tip of the engagement pin 4 is fitted into the hole in the flange 1b' by the repulsive force of the coil spring 11, and the front arm 1a and the rear arm 1b are joined. When the rotation of the part 3 is locked and the engagement pin 4 is pulled against the spring 11, the lock by the engagement pin 4 is released and the joint parts 3 of the front and rear arms 1a, 1b are engaged with each other. It is designed to be able to rotate along the surface.

The leading edge 10'' of the guide sleeve 10 is formed into a stepped shape, and the shaft of the engagement pin 4 is also provided with a stepped holding portion 4'' that engages with the stepped leading edge 10'' of the guide sleeve 10. When the engaging pin 4 is pulled and rotated, the gripping portion 4'' of the pin 4 and the distal end edge 10'' of the guide sleeve 10 come into contact with each other at their mutually convex engaging ends, and the engaging pin 4 is locked. Allows the release state to be maintained.

The guide sleeve 10 and the engagement pin 4 are provided at at least one location on the circumference of the intermediate joint portion 3. Also, the flange side that receives the tip of the engagement pin 4 (in the figure, the flange 1 of the rear arm 1b
A plurality of holes b') are provided at regular angle intervals along the circumference of the flange, for example, at 90° intervals, so that
The intermediate joint 3 of the arm 1 can be locked at an appropriate rotational position.

A hydraulic cylinder 5 installed in the axial direction inside the frame of the arm 1 has a rear end of a cylinder tube 5' fixedly installed within the frame of the rear arm 1b, and a piston rod 6.
is attached so that its tip extends through the hollow shaft core 3' of the intermediate joint portion 3 and into the frame of the front arm 1a. This configuration has the advantage that the hydraulic piping 12a, 12b to the cylinder tube 5' is not interfered with by the rotation of the front arm 1a, and no twisting occurs in the piping.

Elongated guide holes 14, 14 extending along the arm axis direction are formed in the side plates 13, 13 of the front arm 1a, and a shaft rod 7 perpendicular to the rod axis is attached to the tip of the piston rod 6.
Both ends of the shaft rod 7 are made to protrude outside the guide holes 14, 14. Therefore, the tip of the piston rod 6 is supported via the shaft rod 7 in the guide holes 14, 14 so as to be able to reciprocate.

At the tip of the front arm 1a, there is an upper link 8a whose one end is pivoted to the stays 2a' and 2b' of a pair of upper forks, and a lower link 8b whose other end is coaxially pivoted to the shaft rod 7 at the tip of the piston rod 6. It has been done. Thus, the reciprocating movement of the piston rod 6 creates a pair of links 8 that are directly connected to the shaft rod 7 at the tip of the rod.
The upper and lower forks 2a and 2b are driven to open and close in opposite directions via the forks a and 8b.

In addition, the upper and lower forks 2a and 2b of the present invention
Bottom plates 2a″ and 2b″ are attached to each.
In addition to its gripping action, it also has the function of scooping up dirt.

In the figure, 15 is a bolt for connecting a ring plate around the tip edge of flange 1a' to form a recess, 16 is a connecting part for pivotally connecting rear arm 1b to the main body of the civil engineering machine, and 17 is for connecting arm 1. This is the mounting part for the hydraulic cylinder that swings.

[Effect of idea]

As described above, in this invention, the fork member and the arm are constructed as an integrated unit, so replacement is easy, and the operation does not differ depending on the type of civil engineering machine to which it is installed, so constant performance is always guaranteed. .

In addition, by pulling the engagement pin that locks the rotation of the intermediate joint of the arm, the rotational direction of the front arm and the fork structure integrally connected thereto can be easily changed by a predetermined angle. . Therefore, since a single attachment can be used for gripping the fork in both the vertical and lateral directions, the working range is significantly expanded. In particular, the displacement of the operating direction caused by the conventional overload clutch was disadvantageous for disassembling columns, but with the present invention, this problem can be easily solved because the position where the operating direction is changed is securely locked with a removable pin. resolved. In addition, this invention has a structure in which the cylinder is attached to the axis of the arm and directly drives the upper and lower links, so there is no need to provide sub-links as in the past, reducing the number of parts, and This has the effect of imparting a uniform opening/closing driving force to the fork member.

In particular, since the axes of the fork assembly and the arm are in a straight line and the shaft of the fork link is supported by the guide hole of the arm side piece, even if torsion is applied to the pivot joint of the fork assembly, it will break. There is no fear.

Furthermore, the hydraulic cylinder installed in the axial direction inside the frame of the arm has the rear end of the cylinder tube fixedly installed within the frame of the rear arm, and the tip of the piston rod passed through the hollow axis of the intermediate joint into the frame of the front arm. Since it is installed in such a way that it extends to
The effect is that the hydraulic piping to the cylinder tube is not interfered with by the rotation of the front arm, and no twisting occurs in the piping.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a dismantling fork assembly according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a partial sectional view taken along the - line in Fig. 2, and Fig. 4 is a diagram of the disassembly fork assembly according to the present invention. It is a partial top view. 1a...Forward arm, 1b...Backward arm, 2
a, 2b...fork, 3...middle joint, 4...
...Engagement pin, 5...Hydraulic cylinder, 7...Shaft,
8a, 8b... Link, 9... Perforation, 10... Guide sleeve, 11... Coil spring, 14... Guide hole.

Claims (1)

[Scope of utility model registration request] A front arm 1a has a fork structure 2 attached to its tip that can be opened and closed by a pair of links 8a and 8b, and a rear arm 1b has a boom connection part 16 of the civil engineering machine main body and a swing cylinder connection part 17 at its rear. The rotation joint 3 is connected via a self-retentive rotary joint 3 by complementary fitting of the concave and convex steps of the flange having a concave and convex cross section, and the perforation 9 between the flanges of the rotary joint 3 is connected to the perforation 9 between the flanges of the rotary joint 3. A locking mechanism is provided which disables rotation of the joint by engagement of a lock pin 4 which is removably fitted to the rear arm 1b, and fixes the cylinder tube 5' of the hydraulic cylinder 5 to the rear arm 1b, and also secures the piston rod 6 of the hydraulic cylinder 5. a guide hole 14 which is passed through the center of the rotating joint part 3 and whose tip is connected to the link shaft punch 7 of the fork structure 2, and the link shaft punch 7 of the fork structure 2 is formed in the axial direction of the arm 1; , 14 in a slidable manner.