JP2002337055A - Loosening jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loosening jig capable of easily performing loosening operation of a fastening portion. SOLUTION: A first block 3 is attached to a screw rod to rotate around an axis of the screw rod. A first spanner holder 5 is attached to the first block 3 to rotate around an axis almost crossing with the screw rod 1. A second block 7 is attached to a male screw portion 1a by threadedly engaging a screw hole arranged in the second block 7, with the male screw portion 1a. A second spanner holder 8 is attached to the second block 7 to rotate around a shaft almost crossing with the screw rod 1. Spanners 9, 10 are fitted over two polygonal portions 35, 37 for fastening respectively. The first spanner holder 5 and the second spanner holder 7 are fitted over respective spanners 9, 10 to loosen the fastening portion 34 by rotating the screw rod 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for loosening a joint for hydraulic piping, a double nut, and the like used in, for example, construction machines.

[0002]

2. Description of the Related Art In construction machines such as hydraulic excavators,
A joint is provided in a pipe that supplies hydraulic oil to the hydraulic cylinder. Such joints are tightened so that the packing is strongly compressed to prevent leakage of high pressure hydraulic oil. Conventionally, when loosening such a joint, a worker has a total of two spanners, one in each hand, fits the spanners into the two hexagonal portions of the fastening portion screwed together, and rotates the two spanners. It is loosened by operation.

Further, a double nut is used to prevent a retaining bolt of a pin constituting a joint part of a multi-joint front from coming off. Conventionally, when loosening such a double nut, two spanners are used. One of the spanners is fitted to the inner nut of the double nut, and the other is fitted to the outer nut. Is added.

[0004]

The above-mentioned conventional work for tightening and loosening the double nut is often performed at a high place, and the work using both hands is a difficult work involving danger.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a loosening jig capable of easily loosening a fastening portion.

[0006]

According to the first aspect of the present invention, there is provided a loosening jig.
A jig for loosening a joint or a double nut, wherein at least part of the jig is formed with a male screw portion, and a screw rod having a turning operation portion, and one end of the screw rod is turned around an axis of the screw rod. A first block is freely attached, a first wrench holder is attached to the first block so as to be rotatable around an axis substantially intersecting the screw rod, and a second block is attached to the male screw portion. A screw hole provided in the second block is screwed and attached to the male screw portion,
A second spanner holder is attached to the second block so as to be rotatable about an axis substantially intersecting the screw rod, and spanners are respectively attached to two fastening polygon portions of the fastening portion to be loosened. , Each wrench is fitted with the first wrench holder and the second wrench holder, and a tool is mounted on the rotating operation part of the screw rod, and the tool is operated to rotate the screw rod, thereby rotating the screw rod. By moving the block along the screw rod, the fastening portion is loosened.

As described above, a wrench is fitted to two polygonal portions (hexagonal or quadrangular) for tightening and loosening at the fastening portion, each wrench holder is fitted to the wrench, and a tool such as a wrench, ratchet wrench or rod is used. The fastening portion can be loosened by attaching the to the rotation operation portion and turning the screw rod. In this loosening operation, the fastening part can be loosened by operating the tool with one hand using the rotating operation part and turning the screw rod.

According to a second aspect of the present invention, in the loosening jig according to the first aspect, the second block has left and right shaft portions, and the second spanner holder has a fork-shaped mounting portion to the second block. The fork has a notch, and the notch is detachably fitted to the shaft.

As described above, by making the second wrench holder detachable from the second block, the wrench is fitted to each polygonal portion of the fastening portion, the wrench holder is fitted to each wrench, and the screw rod is turned. By aligning the mounting portion (cut) of the second block with the shaft portion of the second spanner holder, these combinations can be easily performed.

[0010] The loosening jig of the third aspect is the first or second aspect.
In the above, the turning operation part of the screw rod may be formed of a fitting part that fits into a fitting part of a ratchet wrench formed at an end on the side where the first block is mounted.

As described above, by making the screw rod rotatable by the ratchet wrench, the screw rod can be continuously rotated while the fitting portion of the ratchet wrench is fitted to the rotating operation portion.

[0012]

FIG. 1A is a partial side view of a boom of a hydraulic excavator showing an example of a fastening portion for performing a loosening operation using a jig according to the present invention. Reference numeral 30 denotes a boom of a hydraulic shovel, which has a hydraulic cylinder 31 on an upper surface thereof for rotating an arm (not shown) attached to a tip of the boom. In the vicinity of the hydraulic cylinder 31, a joint (fastening portion) 34 for detachably connecting a hydraulic pipe 32 mounted on the boom 30 to a hydraulic pipe 33 mounted on the hydraulic cylinder 31 is provided.

FIG. 1B is a plan view showing the structure of the joint 34. A hydraulic pipe 33 on the hydraulic cylinder 31 side and a hydraulic pipe 32 on the main body side include a nut 3 fixed to the hydraulic pipe 32.
5 and a hexagonal part 3 integral with the male screw pipe 36.
By turning 7, fastening or loosening is performed. In the fastened state, the packing (not shown) inside the fastened portion is compressed to maintain liquid tightness.

FIG. 2 is a perspective view showing an embodiment of a loosening jig according to the present invention. Reference numeral 1 denotes a threaded rod. The threaded rod 1 has at least a part formed with a male threaded portion 1a. In the present embodiment, a portion other than the male threaded portion 1a is a rod portion 1b having no thread groove.

A rotating operation part 2 is provided at an end of the rod part 1b.
Are fixed integrally. The rotating operation unit 2 includes a cylindrical unit 2
a is provided with a square hole 2b and a through hole 2c for inserting and turning a rod or the like.

A first block 3 is attached to one end of the screw rod 1 so as to be rotatable about the axis of the screw rod 1. That is, the first block 3 is provided with a hole, and the screw rod 1 penetrates the hole with some gap. The first block 3 includes a ring 5a fitted to the screw rod 1 between a nut 4 fixed to the screw rod 1 by welding and the first block 3, and the cylindrical portion 2a and the first block 3a. And a ring 5b provided so as to be fitted to the screw rod 1 between the screw rod 1 and the block 3 so that the longitudinal movement of the screw rod 1 is suppressed.

Reference numeral 6 denotes a first wrench holder. The first wrench holder 6 has a mounting fork 6a and a cylindrical portion 6b for fitting an arm of the wrench. The fork portion 6a has a through hole, and the first hole of the first spanner holder 6 is rotatably fitted to the shaft portion 3a provided on the left and right of the first block 3 by the through hole. It is attached so as to be rotatable about an axis crossing the screw rod 1.

Reference numeral 7 denotes a second block. The second block 7 is provided with a screw hole 7b provided in the second block 7a.
And screwed on

Reference numeral 8 denotes a second wrench holder. The second wrench holder 8 has a mounting fork portion 8a and a cylindrical portion 8b for fitting an arm portion of a wrench. The fork 8a has a notch 8c. Each of the notches 8c is fitted to a shaft 7a provided on the left and right sides of the second block 7, so that the second spanner holder 8 allows the screw rod 1 Is mounted so as to be rotatable and detachable in a direction substantially perpendicular to the axial direction of the shaft.

When the fastening portion 34 is loosened by using this jig, as shown in FIG. 1B, the fixing nut 35 and the hexagonal portion 37 of the fastening portion 34 are provided with a spanner 9, 10 respectively.
And the respective spanners 9 and 10 are respectively fitted with the respective cylindrical portions 6b and 8b of the first spanner holder 6 and the second spanner holder 8, and as shown in FIG. 2
3B, the prism-shaped fitting portion 11a of the ratchet wrench 11 shown in FIG. 3B is fitted, and the ratchet wrench 11 is continuously reciprocated to rotate the fitting portion 11a in the direction of arrow a. Thereby, the second block 7 is moved in the direction of the arrow b to align the second block 7 with the cut 8c of the second spanner holder 8, and the shaft 7a of the second block 7 is fitted into the cut 8c. By turning the ratchet wrench 11, the spanner 1 is rotated in the direction of arrow R together with the second spanner holder 8, and the fastening portion 34 is loosened. Once loosened, the wrench 10 can be used to turn the hex portion 37 to remove the joint 34 without requiring a large force.

As described above, the fixing nut 35 and the hexagonal portion 37 (which may be formed so as to have a quadrangular outer shape) for tightening and loosening each other at the fastening portion are provided with the wrench 9,
10, each wrench holder 6, 8 is fitted to a wrench 9, 10, and the screw rod 1 is turned by the ratchet wrench 11, so that the fastening portion 34 can be loosened. This loosening operation can be performed by turning the screw rod 1 with one hand using a ratchet wrench.
One hand can hold the ratchet wrench 11 and the other hand can take a working posture of holding the machine, which facilitates the work and improves safety.

In the present embodiment, the second block 7 has shaft portions 7a on the left and right, and the cut 8c of the second spanner holder 8 is removably fitted to the shaft portion 7a. Each of the spanners 10, the spanner holder 8, and the second block 7 can be easily combined with each other. In addition, portability is improved by making the second spanner holder 8 detachable from the second block 7.

Further, the turning operation portion 2 of the screw rod 1 can be formed as a square portion which is turned by a spanner, but in the present embodiment, the turning fitting portion of the ratchet wrench 11 is used. The screw rod can be continuously rotated while the fitting portion 11a of the ratchet wrench 11 is fitted into the square hole 2b of the rotary operation portion 2 because the square hole 2b is fitted into the square hole 2b. In addition, the fitting part of the ratchet wrench 11 may be a polygonal hole, and the turning operation part 2 of the screw rod 1 may be formed in a prismatic shape. The present invention can also be used for loosening a double nut.

[0024]

According to the first aspect, the fastening portion can be loosened by attaching a tool such as a spanner, a ratchet wrench, or a rod to the rotating operation portion and turning the screw rod with one hand. For this reason, in high-altitude work, one hand can hold the tool, and the other hand can take a working posture of holding the machine, which facilitates the work and improves safety.

According to the second aspect, the second spanner holder is detachable from the second block.
The combination of the second spanner holder and the second block can be easily performed.

According to the third aspect, since the ratchet wrench can be attached to the turning operation part, the screw rod can be continuously connected while the fitting part of the ratchet wrench is fitted to the turning operation part of the screw rod. It can be turned and work can be performed efficiently.

[Brief description of the drawings]

FIG. 1A is a partial side view of a boom of a hydraulic shovel showing an example of a fastening portion for performing a loosening operation using a jig according to the present invention, and FIG. 1B is a plan view showing the fastening portion in an enlarged manner. is there.

FIG. 2 is a perspective view showing one embodiment of a jig according to the present invention.

FIG. 3A is a side view showing an example of use of the jig of FIG. 2;
(B) is a perspective view showing the ratchet wrench for turning the screw rod.

[Explanation of symbols]

1: screw rod, 1a: male screw part, 1b: rod part,
2: Rotating operation part, 2a: cylindrical part, 2b: square hole, 2c: through hole, 3: first block, 3a: shaft part, 4: nut, 5a, 5b: ring, 6: first spanner holder , 6
a: Hawk part, 6b: Tube part, 7: Second block, 7
a: Shaft, 7b: Screw hole, 8: Second spanner holder, 8
a: Hawk part, 8b: Tube part, 8c: Cut, 9, 1
0: spanner, 11: ratchet wrench, 11a: fitting part, 30: boom, 31: hydraulic cylinder, 32, 33:
Hydraulic piping, 34: coupling (fastening part), 35: fixed nut,
36: male thread tube, 37: hexagonal part

Claims (3)

[Claims] 1. A jig for loosening a joint or a double nut, comprising: a screw rod having at least a part formed with a male screw part and having a rotating operation part; and a shaft center of the screw rod at one end of the screw rod. A first wrench holder is attached to the first block so as to be rotatable about an axis substantially intersecting the screw rod, and the first block is attached to the male thread portion. A second block is attached by screwing a screw hole provided in the second block to the male screw portion, and the second block is rotatable around an axis substantially intersecting the screw rod. , A second spanner holder is attached, a wrench is fitted to each of two fastening polygons of the fastening portion to be loosened, and the first wrench holder and the second wrench holder are fitted to each wrench. A fastener is loosened by attaching a tool to the rotating operation part of the rod and operating the tool to rotate the screw rod and move the second block along the screw rod. Loose jig. 2. The loosening jig according to claim 1, wherein the second block has left and right shaft portions, and the second spanner holder has a fork-like mounting portion to the second block, and A loosening jig having a cut in a portion thereof, wherein the cut is detachably fitted to the shaft portion. 3. The loosening jig according to claim 1, wherein the turning operation portion of the screw rod is fitted to a turning fitting portion of a ratchet wrench formed at an end on the side where the first block is mounted. A loosening jig comprising a fitting portion to be fitted.