JP3022385U - Tightening wrench such as screws - Google Patents

Abstract

(57) [Abstract] [Purpose] The disadvantage of the conventional ratchet wrench that swings the yoke to intermittently rotate the shank is eliminated, and noise is reduced by continuously rotating the shank in one direction. It also makes it easier to feel the reaction after tightening is complete. [Structure] A drive shaft 7, which is decelerated from an air motor through a reduction mechanism, is supported by a one-way clutch 8 so that the drive shaft 7 can be rotated only in one direction, and a worm is attached to a tip portion of the drive shaft 7. 9 is fixed, a circular opening is formed in the housing at a side position of the worm 9, and a worm wheel 10 that meshes with the worm 9 is provided in the opening, and the shank 2 is attached to the rotary shaft core of the worm wheel 10. When it is installed and the air motor is activated, the drive shaft 7 passes through the worm 9 and the worm wheel 10
At the same time, the shank 2 is configured to be continuously rotated without returning in one direction and rotating so that bolts and nuts can be tightened and loosened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wrench used for tightening and loosening bolts and nuts (hereinafter simply referred to as a tightening wrench such as a screw).

[0002]

[Prior art]

 Conventionally, ratchet wrench is commonly used for tightening and loosening screws such as bolts and nuts. Generally, a ratchet wrench is a spherical bush that is fitted to a pin shaft that is erected at an eccentric position on the flange of the crank shaft by transmitting the rotation of a spindle that is rotated by an air motor to the crank shaft through a reduction mechanism. The body is swung to swing the yoke held by the housing, and by the action of the ratchet mechanism, which consists of the swing of this yoke and the pawls elastically biased by the internal teeth formed on the inner circumference of the york, The shank, which is rotatably held by the housing and is located in the yoke, is intermittently rotated in a prescribed direction, and the intermittent rotation of this shank is used to mechanically remove screws such as bolts and nuts. It is structured so that it can be tightened and loosened.

[0003]

[Problems to be solved by the device]

 However, in the conventional ratchet wrench, as described above, the shank oscillates so that the yoke swings intermittently. I'm doing bad. In addition, since the bolts and nuts are tightened by an intermittent ratchet mechanism, it is difficult to feel the degree of tightening of the bolts and nuts, that is, the subtle reaction when tightening is completed. It takes a great deal of skill to be able to tighten the nuts and nuts reasonably and securely.

The present invention has been made for the purpose of providing a tightening lever for a screw or the like, which generates less noise during operation, is easy to feel the tightening degree of bolts and nuts, and has a large shank rotation torque. It is a thing.

[0005]

[Means for Solving the Problems]

 According to the present invention, for example, when the grip lever of the wrench body is operated to operate the air motor in the housing body, the shank portion is continuously rotated in one direction without swinging the yoke. The above problem was solved. That is, in the tightening wrench such as the screw of the present invention, the drive shaft that is decelerated from the air motor through the reduction mechanism is supported by the one-way clutch so that it can rotate only in one direction, and the worm is attached to the tip of the worm. A circular opening is formed in the housing at a side position of the worm, a worm wheel that meshes with the worm is provided in this opening, and a shank is fitted to the rotation shaft core of the worm wheel. There is something.

[0006]

[Embodiment]

 As shown in FIGS. 1 and 2, the screw tightening wrench of the present invention comprises a housing main body 1 which is a hand grip and a front housing 3 having a shank 2. Inside the housing body 1, an air motor (not shown) whose operation is turned on and off by a grip lever 4 and a rotating spindle 5 thereof are provided, and a planet for decelerating the rotation of the spindle 5 is provided on the housing 3 side. A gear mechanism 6 and a drive shaft 7 rotatably transmitted from the speed reduction mechanism are provided. The drive shaft 7 is supported by a one-way clutch 8 so as to be rotatable in only one direction, and a worm 9 is attached to a tip portion thereof. .

On the other hand, a circular opening is formed at a side position of the worm 9 of the housing 3, and a worm wheel 10 that meshes with the worm 9 is provided in the circular opening, and a rotary shaft core of the worm wheel 10 is provided. When the shank 2 is fitted to the shank 2 and the drive shaft 7 is rotated, the worm 9 continuously rotates the shank 2 together with the worm wheel 10, and the socket 20 mounted on the end of the shank 2 is rotated. Therefore, bolts and nuts can be tightened or loosened.

In the present invention, since the drive shaft 7 is supported by the one-way clutch 8 as described above, the drive shaft 7 is allowed to rotate only in one direction, and can return and rotate in the opposite direction. Therefore, the shank 2 is continuously returned to the shank 2 in one direction without turning and the bolts and nuts are tightened. The worm wheel 10 has a strong turning torque to tighten the bolts and nuts without excess or deficiency.

As the one-way clutch 8 used for the drive shaft 7, various known structures may be applied, but for the screw tightening wrench of the present invention, illustration is omitted. However, serrated teeth are formed on the outer periphery of the drive shaft 7 at equal intervals in the axial direction, and rod rollers are serrated on the inner peripheral surface of the housing 3 and in the valleys of the serrated teeth. Those that are rotatably arranged at the respective valleys of the teeth of the.

The shank 2 provided on the shaft core of the worm wheel 10 may be of a fixed type, but is not movable in the vertical direction over a predetermined range in the shaft core of the worm wheel 10, and one end of the worm wheel 10 is not movable. Conveniently, 2A can be used to tighten bolts and nuts, and the other end 2B can be used to loosen bolts and nuts.

[0011]

【Example】

 An embodiment of the present invention will be described in more detail with reference to the drawings. A tightening wrench such as a screw of the present invention can be operated by turning on / off a grip lever 4 of a motor housing 1 as shown in FIG. A worm 9 is provided at the tip of a drive shaft 7 where the motor is operated and the rotation of the spindle 5 of the air motor is decelerated by the planetary gear mechanism 6 and transmitted in rotation. A one-way clutch 8 is interposed between the drive shaft 7 and the housing 3, whereby the drive shaft 7 is allowed to rotate only in one direction but cannot rotate in the reverse direction.

A circular opening is formed at a position lateral to the worm 9 at the front end of the housing 3, and a worm wheel 10 that meshes with the worm 9 is provided in the circular opening so that the drive shaft 7 is fixed. When the worm wheel 10 is rotated in the direction of, the worm wheel 10 is gradually and continuously rotated. The shank 2 is provided on the shaft core of the worm wheel 10 so that the shank 2 is rotated together with the worm wheel 10 to tighten or loosen the bolts or nuts with the socket 20 attached to the tip. .

In the present embodiment, the shank 2 has a rectangular cross section and is fitted and attached to the shaft core of the worm wheel 10 so as to be slidable in the vertical direction. Recesses 11 are formed in the respective recesses, and stopper balls 13A and 13B supported by springs 12 are provided in the recesses 11, respectively. In addition, a ball stopper 14 which is elastically biased in the projecting direction is provided on the side surface of the intermediate portion of the shank 2, and is formed in a groove 15 formed on the inner surface of the worm wheel 10 where both ends are deepened. The ball is positioned to regulate the vertical movement stroke of the shank 2.

That is, when the shank 2 is forcibly pushed in the vertical direction, the ball stopper 14 is pushed down, and when the ball reaches the upper end portion or the lower end portion of the groove 15, the ball projects into the deep portion of the groove 15. By preventing the shank 2 from moving at that position, the vertical movement stroke of the shank 2 is restricted. Then, when the shank 2 is pushed upward or downward between these regulated strokes, the stopper ball 13A or 13B portion of the shank 2 projects upward or downward of the housing 3 and a bolt is attached to the projecting end of the shank 2. A socket 20 that can be fitted to the head and nuts of the above can be mounted using these stopper balls 13A and 13B.

Therefore, when the lower stopper ball 13B portion in FIG. 2 is projected, the socket 20 is mounted and the drive shaft 7 is rotated, the shank 2 is rotated clockwise to remove the bolt and the nut. It can be tightened, and when the upper stopper ball 13A part in Fig. 2 is projected and the socket 20 is mounted, the wrench body is turned over and the drive shaft 7 is rotated, the shank 2 rotates counterclockwise and the bolt is rotated. You can loosen the nuts and nuts.

[0016]

[Effect of device]

 As described above, in the tightening wrench such as the screw of the present invention, the drive shaft 7, which is decelerated from the air motor through the speed reducer mechanism, is supported by the one-way clutch 8 so as to be rotatable only in one direction, and the worm 9 is provided at the tip. A circular opening is formed in the housing in the side direction of the worm 9, and the worm wheel 10 that meshes with the worm 9 is provided in this opening, and the shank 2 is provided on the rotary shaft core of the worm wheel 10. Unlike the conventional ratchet wrench, when the air motor is operated and the drive shaft 7 is rotated, the shank 2 is continuously rotated together with the worm wheel 10, so that the ratchet wrench is continuously fitted. There is no noise of the yoke swinging, and the socket attached to the end of the shank 2 makes it easier to tighten or loosen the bolts and nuts. Ukoto can.

In the present invention, since the drive shaft 7 is restricted in one direction by the one-way clutch 8 as described above, the shank 2 is also allowed to rotate only in one direction. , It is possible to perform accurate tightening without turning back in the opposite direction. In addition, since the shank 2 is continuously rotated to tighten the bolts and nuts, the reaction when the tightening is completed can be directly felt by the hand like a manual work with a conventional spanner. Can be tightened without.

Further, according to a second aspect, the shank 2 is slidably fitted in the shaft core portion of the worm wheel 10 in the vertical direction within a restricted range, and the recess 11 is provided in the upper and lower portions of the shank 2, respectively. The stopper ball 13A, 13B supported by the spring 12 is provided in the recess 11 and the vertical movement of the shank 2 is restrained, and only one stopper ball 13A or 13B is formed. So as to project above or below the housing 3, and by using these stopper balls 13A and 13B, a socket capable of fitting a bolt head or a nut can be mounted on the projecting end of the shank 2. With this configuration, when the lower stopper ball 13B is projected and the socket 20 is mounted and the drive shaft 7 is rotated, the shank 2 rotates clockwise, and the shank 2 When the socket 2 is moved upward and the stopper ball 13A on the upper side is projected to mount the socket 20, the wrench body is turned over and the drive shaft 7 is rotated, the shank 2 rotates counterclockwise. You can use a single wrench to tighten and loosen the screw, which is a useful effect in practice.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a ratchet wrench of the present invention.

FIG. 2 is a vertical sectional view of a main part of the present invention.

[Explanation of symbols]

2. Shank 3. Housing 5. spindle
6. Planetary gear mechanism 7. Drive shaft 8. One-way clutch 9. Warm 10. Warm wheel 11. Recess 12. Spring 13A. Stopper ball 13B. Stopper ball

Claims (2)

[Scope of utility model registration request] 1. A drive shaft, which is decelerated from an air motor through a reduction mechanism, is supported by a one-way clutch so as to be rotatable in only one direction, and a worm is attached to a tip end of the drive shaft. A tightening wrench such as a screw, characterized in that a circular opening is formed, a worm wheel that meshes with the worm is provided in the opening, and a shank 2 is fitted to the rotary shaft core of the worm wheel. 2. A shank 2 is slidably fitted in the rotary shaft core of the worm wheel in a vertically regulated range, and recesses 11 are formed in the upper and lower parts of the shank 2, respectively. Stopper balls 13A and 13B supported by springs 12 are respectively installed inside the shank 2, and when the shank 2 moves the regulated stroke upward or downward, one of the stopper balls 13A or 13B is located on the housing 3 side. The tightening wrench for a screw or the like according to claim 1, wherein the tightening wrench is configured to project upward or downward of the screw and hold its position.