JPH06666U - Ratchet wrench - Google Patents

Abstract

(57) [Abstract] [Purpose] The ratchet teeth are formed by engaging two adjacent teeth with the ratchet teeth by engaging the two engaging parts by the step provided at the tip of the engaging claw. Dispersing the force to be transmitted to make it smaller, and making the base end of the engaging claw larger than the half arc shape and holding it in the fitting hole facilitates the production of the engaging claw. [Structure] A rotor having ratchet teeth on the outer periphery is housed in an annular recess of the main body on the tip end side of the handle and is vertically rotatably supported, and a switching cam body is interposed between the ratchet teeth. A ratchet wrench provided with a pair of engaging claws opposed to each other and engaging and disengaging the engaging claws from the ratchet teeth by the switching operation of the switching cam body, wherein the engaging claw has a stepped portion on the tip side. Two engaging portions formed by the above are provided, and the engaging portions are engaged with and disengaged from two adjacent teeth of the ratchet tooth portion, and the proximal end side of the engaging claws exceeds the half arc surface. In addition to forming an arc surface, a space is provided on the inner wall of the annular recess, and a fitting hole partially connected to the recess is fitted and held.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an engaging claw which is opposed to a ratchet tooth portion in a ratchet wrench and engages with and disengages from the tooth portion.

[0002]

[Prior art]

 As shown in FIGS. 4 and 5, a conventional ratchet wrench engagement claw is composed of a pair of flat plate elongated pieces that engage and disengage with a ratchet tooth portion b provided on a rotor a. A projecting shaft portion d is provided on the end side, and this is fitted into a shaft hole f provided in a concave portion e of the main body of the handle tip portion, and a spring g is biased toward the center portion. Only one surface of one tooth of the tooth portion b is engaged.

Therefore, in order to transmit the torque by rotating the handle, the rotor is rotated by transmitting the torque to one tooth of the ratchet tooth via the engaging claw.

[0004]

[Problems to be solved by the device]

 As described above, the torque of the handle is transmitted to the rotor via the engaging claws. At this time, the ratchet teeth provided on the rotor are transmitted by engaging the engaging claws and one tooth. Are not reliable because they are not reliable, and because they have only one tooth, they are engaged, so the load applied to one tooth is strong and the durability is poor. Since the shaft is provided and fitted in the shaft hole, there is a problem in manufacturing the engaging claw.

[0005]

[Means for Solving the Problems]

 According to the present invention, when a pair of engaging claws are switched by the switching cam body to engage with the ratchet teeth, a step is provided on the tip side of the engaging claws to form two engaging parts. The load applied to one tooth of the ratchet tooth is dissipated by engaging two adjacent tooth portions of the ratchet tooth corresponding to each other to reduce the load, and the protruding shaft at the base end of the engaging claw is also used. The ratchet wrench facilitates the production of the engaging claws by removing them and holding them in the fitting holes.

[0006]

[Action]

 According to the present invention, the switching cam body 11 integrated with the operation lever 16 is formed by inserting the angular shaft portion 6b integral with the rotor 6 on the driven side and rotating the operation lever 16 left and right when transmitting the rotation. The engagement claw 10 or 10a held in one of the fitting holes 12 is disengaged from the ratchet tooth 6a against the spring 14 or 14a. Also, at this time, the other engaging claw on which the switching cam body 11 does not act is the two adjacent teeth of the ratchet tooth portion 6a by the operation of the spring 14 or 14a, and the two tips formed by the step portion at the tip. The engaging portions T and Ta engage with each other. In this state, if the handle 6 is operated to rotate the rotor 6 counterclockwise or leftward, this torque will be applied to the engaging claw 10 at two points formed by stepped portions when the handle 2 is operated. The joints T and Ta engage with the surfaces of two adjacent teeth of the ratchet tooth 6a provided on the rotor 6, and when turned to the left, the engaging claw 10 resists the spring 14 by the ratchet tooth 6a. Only when it is pushed open and freely rotated on the ratchet tooth 6a and turned clockwise, the tip engaging portions T and Ta of the engaging claw engage with the two adjacent teeth of the ratchet tooth 6a and the rotor 6 is rotated. The rotational force is transmitted to and the force is transmitted to the driven side.

When it is desired to change the rotation direction, the operation lever 16 is operated to move the engaging claw 10 having two engaging portions T and Ta through the switching cam body 11 against the spring 14 against the ratchet. When the tooth 6a is disengaged from the engaging portion of the two teeth, the engaging portion T, Ta at the tip of the other engaging claw 10a engages with the adjacent two teeth of the ratchet tooth 6a by the switching cam body 11 and meshes. The rotation is transmitted.

Further, when the operation lever 16 is set at an intermediate position, that is, the switching cam body 11 is along the center line, the switching cam body 11 does not act on any of the engaging claws 10 and 10a, so that the ratchet teeth 6a and The rotor 6 is engaged with the tip engaging portions T and Ta of the respective engaging claws 10 and 10a, and the rotor 6 is locked, and the rotation is transmitted to the rotor 6 even when the rotor 6 is rotated left or right. Do the same.

[0009]

【Example】

 FIG. 1 shows an embodiment of a ratchet wrench according to the present invention, which will be specifically described with reference to FIGS.

Reference numeral 1 denotes a main body having a handle 2, which has a concave portion 5 composed of two continuous annular portions 3 and 4 formed in a cocoon-like shape at the tip of the main body 1. A shaft hole 7 into which one end bearing portion of a rotor 6 having upper and lower stepped portions formed by continuous ratchet tooth portions 6a is fitted is formed, and the bearing portion at the other end of the rotor 6 is The rotor 6 is rotatably supported by being fitted in a shaft hole 9 formed in a cover 8 covering the recess 5 of the corresponding main body 1. Further, in the other annular portion 4, a stepped portion is provided at the tip to form two engaging portions T and Ta, and these two engaging portions T and Ta are adjacent to the ratchet tooth portion 6a. Engaging claws 10 and 10a made of a pair of plate-like elongated pieces that can be engaged and disengaged from one tooth and positioned to face each other with a switching cam body 11 interposed therebetween. The end side is provided on the inner wall of the annular recess 5 of the annular portion 4 with a space therebetween, and the end face to be held by being fitted into the fitting holes 12, 12 partially communicating with the recess 5 is formed on the arc surface 13. However, the arc surface 13 has a half or more as an arc surface so as not to separate toward the inside when fitted into the fitting holes 12, 12. Further, springs 14 and 14a biased toward the center line of the main body 1 are applied to the engaging claws 10 and 10a. The switching cam body 11 located between the engagement claws 10 and 10a has a shaft 11a inserted from the inside to the outside through a shaft hole 15 of the body 1 provided on the center line of the body 1, An operation lever 16 provided outside the above is attached, and the switching cam body 11 is rotated by the rotation of the operation lever 16 to switch the engagement claws 10 and 10a.

The operation lever 16 is provided with a structure (not shown) that restricts the position when the operation lever 16 is rotated right and left.

The rotor 6 has an angular shaft 6b which is integrally formed with one of the bearings and protrudes from the angular shaft 6b. A lateral hole is provided in the angular shaft 6b, and a spring-loaded sphere is provided in the lateral hole. The driven shaft into which the square shaft 6b is inserted is locked.

[0013]

[Effect of device]

 As described above, according to the present invention, the ratchet teeth are continuously provided on the outer periphery of the rotor, the rotor is housed in the cocoon-shaped annular recess at the tip of the main body having the handle, and the upper and lower bearings of the rotor are arranged as shafts. In a ratchet wrench provided with a pair of switching engagement claws that support the ratchet teeth and face and engage and disengage the switching cam body, a plate in which the pair of switching engagement claws are flattened The base end side is formed with an arc surface that exceeds a semi-circular arc, and this arc surface can be swung into a fitting hole that is continuous with the inner wall of the annular recess at the tip of the main body. A pair of switching engagement claws, which are fitted and inserted into each other, each have a stepped portion at the tip thereof to form two engagement portions, and two adjacent ratchet tooth portions provided on the outer circumference of the rotor are adjacent to each other. It is designed to engage and disengage from the teeth. A certain engaging portion is formed so that it can be engaged with two adjacent teeth of the ratchet tooth portion, so there is a certainty. The area of contact between the artificial jaw and the teeth is doubled, and the load strength is also increased. Therefore, the width can be reduced and the thickness can be reduced. Further, since the base end of the engaging claw is held by the fitting hole, the conventional projection is removed, and the engaging claw is easy to manufacture, and there is no inconvenience such as falling down during assembly, so that the engaging claw can be easily assembled. And so on.

[Brief description of drawings]

FIG. 1 is a partial plan view showing an embodiment of a ratchet wrench according to the present invention.

FIG. 2 is a central longitudinal sectional view of a ratchet wrench according to the present invention.

FIG. 3 is a perspective view of a switching engagement claw used for a ratchet wrench according to the present invention.

FIG. 4 is a plan view showing a part of a conventional ratchet wrench.

5 is a perspective view of a switching engagement claw used for the ratchet wrench of FIG. 1. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Handle 3,4 Annular part 5 Recessed part 6 Rotor 6a Ratchet tooth part 6b Angular shaft 7,9,15 Shaft hole 8 Cover 10,10a Engaging claw 11 Switching cam body 11a Shaft 12 Fitting hole 13 Arc surface 14 , 14a Spring 16 Operation lever

Claims (1)

[Scope of utility model registration request] 1. A ratchet tooth portion which is continuous on the outer circumference, a rotor having a step portion vertically and an angular shaft at one end are housed in a cocoon-shaped annular recess of a main body at the handle front end, and the rotor is vertically moved. Of the ratchet teeth,
Providing a pair of engaging claws facing each other with the switching cam body in between,
In the ratchet wrench in which the engaging claws can be engaged and disengaged from the ratchet teeth by the switching operation of the switching cam body, the pair of engaging claws are formed by plate-like strips and correspond to the ratchet teeth at the tip. On the side to be engaged, two engaging portions are formed by the step portion, and the engaging portions are adjacent to the ratchet teeth portion.
It is made to engage with the teeth of the sheet, and the proximal end side of the engaging claw is
A ratchet wrench characterized in that an end face for swingably holding in a fitting hole provided at an interval on an inner wall of an annular recess of the main body is formed as an arc surface larger than a half arc surface.