JPH11156738A - Bolt and nut mounting/demounting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fasten and loosen a plurality of bolts and nuts simultaneously, and tighten them uniformly with its operations made excellent. SOLUTION: A tool case 1 is formed into a box shape, and an operating shaft 2 is vertically penetrated through at the center part so as to be rotatably supported. A mounting part to which a wrench is mounted, and a main driving gear 5 are fixed to the upper end part and lower end part of main shaft 2 respectively. A transmission shaft 6 is vertically penetrated through so as to be rotatably supported at both end parts of the case 1. An input gear 7 and an output gear 8, which are meshed with the main driving gear 5, are fixed over to the transmission shaft 6. Four driving shafts 9 laid at equal intervals around the main shaft 2 are rotatably supported by the case 1. Driving gears 10 to be meashed with the output gear 8 are provided over to the driving shafts 9. Each disc spring 12 is provided for the driving gears 10 so as to be housed in spaces interspaced with the driving shafts 9, and is locked by each lock nut 13 pressing each disc spring in the axial direction. The fastening torque of each socket 14 is adjusted by increasing/decreasing compression applied to each disc spring 12 in extent by each lock nut 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of bolts and nuts arranged at predetermined positions, for example, four bolts screwed into a clamp portion of a sleeve for connecting a jumper wire to a power transmission line. The present invention relates to a bolt and nut attaching / detaching tool that can be tightened or loosened at one time at the same time.

[0002]

2. Description of the Related Art Conventionally, even if a plurality of bolts and nuts are in a fixed position, there is no tool for simultaneously tightening them.
They are tightened one by one with a wrench, spanner, etc. Therefore,
The working efficiency is poor, the tightening torque varies, and the tightening strength varies, so that the members may not be reliably connected. In addition, there is a problem in that the tightening of bolts and nuts is likely to be excessive or insufficient, and these may be damaged or tightened loosely.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a plurality of bolts and nuts can be tightened at the same time, the work efficiency is good, the screws can be tightened with uniform strength, and the strength is not varied. It is an object of the present invention to provide a bolt and nut attaching / detaching tool capable of securely connecting a space and adjusting a proper tightening strength.

[0004]

In order to solve the above problems, in the first invention, a case 1 supports a main shaft 2 rotatable by a lever 4 and a driving gear 5 is fixed on the way of the main shaft 2. Further, a transmission gear 7 meshing with the main driving gear 5 is rotatably supported on the case 1, and a plurality of drive shafts 9 are rotatably supported on the case 1.
The drive gear 10 meshing with the drive shaft 9 is releasably connected with a predetermined torque, and the lower end of the drive shaft 9 is provided with a socket 14 fitted to a bolt and a nut, respectively, thereby forming a bolt and a nut attaching / detaching tool. In the second invention, the drive shaft 9 is provided with a flange portion 9a formed with a plurality of engagement recesses 9b.
The drive shaft 9 and the drive gear 10 fall into the engagement recess 9b.
On the other hand, the drive shaft 9 is provided with a spring member 11 for pressing the drive gear 10 against the flange 9a. A lock nut 12 which is sandwiched and compressed between the drive gear 10 and the drive nut 9 is screwed to the drive shaft 9 to adjust the tightening torque.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. 1 is a plan view of a tool for attaching and detaching bolts and nuts, FIG. 2 is a vertical cross-sectional view of the tool with a part cut away, FIG. 3 is a bottom view of the tool, FIG. 4 is a vertical cross-sectional view of a wrench mounting portion, and FIG. 4 is a sectional view taken along line VV, FIG. 6 is a longitudinal sectional view of the drive gear, and FIG. 7 is a sectional view taken along line VII-VII of FIG. As shown in FIGS. 1 to 3, the tool case 1 has a substantially elliptical cylindrical box shape, and is configured such that a lid 1b closes a main body 1a having an open upper part. A substantially U-shaped handle 1c is provided on the side of the main body 1a.

A main shaft 2 extends vertically through the center of the case 1 and is rotatably supported by a main body 1a and a lid 1b. A mounting portion 3 for mounting a wrench 4 constituting a lever is provided at an upper end portion of the main shaft 2. As shown in FIGS. 4 and 5, the mounting portion 3 has a hexagonal bolt head 3 a fixed to the main shaft 1. An annular groove 3b is formed in the upper outer periphery of the bolt head 3a.

[0007] The corresponding mounting portion 4a of the wrench 4 has a shaft core portion 4b protruding substantially perpendicularly from the wrench body. A socket 4c fitted to the bolt head 3a is fixed to the shaft core 4b. The steel ball 4d is housed in the holding hole that is formed on the side surface of the socket 4c and extends outwardly so as to protrude inside and outside the socket 4c. A stopper ring 4e is mounted on the outer periphery of the socket 4c so as to be movable in the axial direction, and a steel ball 4d is held between the two. A spring 4f for urging the stopper ring 4e toward the wrench body is provided between the socket 4c and the stopper ring 4e. The inner surface of the stopper ring 4e has an annular groove 4g for moving the steel ball 4d outward.

The corresponding mounting portion 4a of the wrench 4 includes a spring 4
By pulling down the stopper ring 4e while compressing f,
The steel ball 4d projecting inside the socket 4c is
g, the main shaft 2 can be attached to and detached from the mounting portion 3. After the mounting, the stopper ring 4e moves toward the wrench main body due to the return of the spring 4f, and the steel ball 4d moves from the annular groove 4g and projects again into the socket 4c. The wrench 4 is retained.

A driving gear 5 is fixed to a lower portion of the mounting portion 3. A transmission shaft 6 penetrates vertically at both ends of the case 1 and is rotatably supported by the main body 1a and the lid 1b. An input gear 7 and an output gear 8 constituting a transmission gear are fixed to the transmission shaft 6. The input gear 7 meshes with the driving gear 5. The output gear 8 has a smaller diameter than the input gear 7.

At the bottom of the case 1, four drive shafts 9 are rotatably supported around the axis of the main shaft 2 at equal intervals. The driving gear 1 meshing with the output gear 8 is provided at the upper end of the driving shaft 9.
0 is linked. The drive gear 10 is supported by a flange 9a of the drive shaft 9, as shown in FIGS. The flange 9a has three engaging recesses 9b at equal intervals. The engaging recess 9b holds a steel ball 11 built therein so as to slightly protrude from the drive gear 10. The drive gear 10 is provided with a housing recess 10a. A disc spring 12 which is a spring member is accommodated in the accommodation recess 10a. A lock nut 13 that compresses in the axial direction with a disc spring 12 sandwiched between the drive shaft 9 and the drive gear 10 is screwed into the upper end of the drive shaft 9. This lock nut 13
Changes the compression length of the disc spring 12 to change the driving gear 1
The maximum tightening torque can be adjusted by adjusting the coupling force between 0 and the drive shaft 9. The lower end of the drive shaft 9 is connected to a socket 14 fitted to a bolt and a nut B.

In this tool, when the wrench 4 is mounted on the mounting portion 3 of the main shaft 2 and the main shaft 2 is rotated, the gear 5,
Since the four sockets 14 are rotated via 7, 8, and 10, four bolts and nuts B fitted to these can be simultaneously tightened or loosened. Each drive gear 10 has the same amount of rotation and the same amount of tightening. The maximum tightening torque of the drive gear 10 is previously adjusted by changing the number of disc springs 12 or tightening the lock nut 12. Since the drive shaft 9 and the drive gear 10 are joined by the steel ball 11 held in the engagement recess 9b of the flange 9a,
When the drive shaft 9 is rotated, the drive gear 10 is also rotated. However, when the bolts and nuts B are tightened to reach the maximum tightening torque, the steel ball 11 deviates from the recess 9b and the drive shaft 9 and the drive gear The connection with the wrench 4 is released, and the operation of the wrench 4 is not transmitted to the bolt and the nut B, so that excessive tightening is prevented. Even if the initial tightening of each bolt and nut B varies, the same tightening strength is obtained by tightening with a tool. After tightening the bolts and nuts B, replace the wrench 4 with a torque wrench and operate.
The tightening torque of the bolt and nut B can be confirmed.

[0012]

As described above, according to the present invention, a plurality of bolts and nuts can be tightened and loosened at the same time, so that the working efficiency for connecting the members is good and the bolts can be evenly tightened. There is no variation in the fastening strength, and the members can be firmly connected. In addition, since the tightening torque can be adjusted, the bolts and nuts can be tightened with appropriate force without excess or shortage, and loosening and breakage can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a bolt and nut attaching / detaching tool.

FIG. 2 is a vertical sectional view of a bolt and nut attaching / detaching tool.

FIG. 3 is a bottom view of a bolt and nut attaching / detaching tool.

FIG. 4 is a longitudinal sectional view of a mounting portion of the wrench.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a longitudinal sectional view of a driving gear.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Main shaft 3 Mounting part 4 Wrench 5 Main gear 6 Transmission shaft 7 Input gear 8 Output gear 9 Drive shaft 10 Drive gear 11 Steel ball 12 Disc spring 13 Lock nut 13 Socket

Claims (2)

[Claims] A case provided with a pair of opposing support plates, a main shaft supported by the support plate of the case, a driving gear fixed to a midway in the case, and rotatable by a lever outside the case; A transmission gear rotatably supported by the support plate so as to mesh with the gear, and a drive gear meshing with the transmission gear are releasably coupled with a predetermined torque, and are respectively fitted to bolts and nuts at lower ends. A bolt and nut attaching / detaching tool, comprising: a socket; and a plurality of drive shafts rotatably supported by a support plate. 2. A flange provided on the drive shaft and having a plurality of engagement recesses formed around the shaft; and a flange held by the drive gear and entering the engagement recess to couple the drive shaft and the drive gear. On the other hand, a steel ball that deviates from the engagement concave portion to release the connection, a spring member that presses the drive gear against the flange of the drive shaft, and is screwed to the drive shaft to adjust a compression length of the spring member. The bolt and nut attaching / detaching tool according to claim 1, further comprising a lock nut.