JPH0744451Y2 - Ratchet wrench - Google Patents

Description

[Detailed description of the device]

[0001]

FIELD OF THE INVENTION The present invention relates to an improvement of a ratchet wrench.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional ratchet wrench engaging claw is composed of a pair of flat plate elongated pieces that engage with and disengage from ratchet teeth b provided on a rotor a. ，
The c is provided with a protruding shaft portion d on the base end side, and is fitted into a shaft hole f formed in a recess e of the main body of the handle front end portion and urges a spring g toward the central portion. The tip portion is adapted to be engaged with only one surface of one tooth of the tooth portion b.

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 portion through the engaging claw. Then, the torque of the handle is transmitted to the rotor via the engaging claws, but at this time, the ratchet teeth provided on the rotor are transmitted by engaging with the engaging claws and one tooth, which is reliable. It is not stable and unstable, and since it is engaged with only one tooth, the load applied to one tooth is strong and durability is poor. Further, there is a difficulty in manufacturing the engaging claws because a protruding shaft is provided at the base end portion of the engaging claws and is fitted into the shaft hole.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a ratchet wrench in which the engaging action is surely performed.

[0005]

The means of the present invention are as follows. A ratchet tooth part which is continuous on the outer circumference, a rotor having upper and lower step parts and an angular shaft at one end are housed in a cocoon-shaped annular recess of the main body on the handle front end side, and the upper and lower step parts of the rotor are arranged as shafts. A ratchet of a type in which a pair of engaging pawls that support the ratchet tooth portion are provided so as to face each other with a switching cam body interposed therebetween, and the engaging pawl can be disengaged from the ratchet tooth portion by the switching operation of the switching cam body. In the wrench, each of the pair of engaging claws is formed by a plate-shaped strip and is
Two engaging parts that engage with one tooth are formed at the tip of each engaging claw, and the base ends of the engaging claws are fitted in the inner wall of the annular recess of the main body at intervals so as to form a truncated circular fit. A ratchet wrench with a half-arc surface or more that is loosely inserted into the hole.

[0006]

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 into the driven side and rotating the operation lever 16 left and right when transmitting the rotation.
Disengages the engagement claw 10 or 10a held in one of the truncated circular fitting holes 12 from the ratchet tooth 6a against the spring 14 or 14a. At this time, the other engaging claw on which the switching cam body 11 does not work is the spring 14
Or, by the action of 14a, two teeth of the ratchet tooth portion 6a and two engaging portions T whose tips are formed by step portions,
Engage at Ta. In this state, when the rotor 6 is rotated counterclockwise or leftward by operating the handle 2, this torque is generated, for example, when the handle 2 is operated, the two engagement points formed by the stepped portion on the tip side of the engaging claw 10 are engaged. The portions T and Ta engage with the surfaces of the two teeth of the ratchet tooth 6a provided on the rotor 6, and when turned to the left, the engaging claw 10 is pushed open against the spring 14 by the ratchet tooth 6a. , The ratchet teeth 6a are freely rotated, and the tip engaging portions T, Ta of the engaging claws are only turned clockwise.
However, by engaging with two adjacent teeth of the ratchet teeth 6a, the rotational force is transmitted to the rotor 6 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 the two engaging portions T and Ta through the switching cam body 11 against the spring 14 against the ratchet teeth. 6a When it is disengaged from the engaging portion of the two teeth, the engaging portion T at the tip of the other engaging claw 10a, Ta is the switching cam body 1
1 engages with two adjacent teeth of the ratchet teeth 6a and meshes with them to transmit the rotation.

Further, when the operation lever 16 is set at the 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 pawls 10 and 10a, so that the ratchet teeth 6a and the ratchet teeth 6a, respectively. The rotor 6 is locked by engaging the tip engaging portions T and Ta of the engaging claws 10 and 10a, and the rotation is transmitted to the rotor 6 even if the rotor 6 is rotated left or right, and the same function as a general wrench is achieved. To do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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, and two continuous annular portions 3 formed in a cocoon shape at the tip of the main body 1.
4 has a recess 5 formed therein, and on one side of the annular portion 3 is formed a shaft hole 7 into which a bearing portion of a rotor 6 having upper and lower stepped portions formed by ratchet teeth 6a continuous to the outer periphery is fitted. ,
The bearing portion at the other end of the rotor 6 is fitted into the shaft hole 9 formed in the cover 8 covering the recess 5 of the main body 1 corresponding to the shaft hole 7 to rotatably support the rotor 6. There is. Further, a step portion is provided at the tip of the other annular portion 4 to provide two engaging portions T,
Ta is molded, and the engaging cams 10 and 10a formed of a pair of plate-shaped elongated pieces that can switch by engaging and disengaging the two engaging parts T and Ta with the two teeth of the ratchet tooth part 6a are switching cams. Position the body 11 so as to face each other with the body 11 interposed therebetween, and
The end faces of the bases 0 and 10a are fitted and held in the recessed circular fitting holes 12 and 12 which are provided in the inner wall of the annular recess 5 of the annular portion 4 with a space therebetween and are partially connected to the recess 5. Is formed on the arc surface 13, and the arc surface 13 has a missing circular fitting hole 12, 1.
The arc surface is half or more so that it does not separate toward the inside when fitted to 2. Further, the springs 14, 14 biased toward the center line of the main body 1 are applied to the respective engaging claws 10, 10a.
a is made to act. The switching cam body 11 positioned between the engaging claws 10 and 10a has a main body 1 which is inserted into the shaft 11a from the inside to the outside through a shaft hole 15 of the main body 1 provided on the center line of the main body 1. The operation lever 16 provided on the outer side of the switching cam body 11 is attached by turning the operation lever 16.
The engaging claws 10 and 10a are switched by rotating.

The operation lever 16 is provided with a structure (not shown) for restricting 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. 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]

According to the present invention, a pair of switching engagement claws are made of a flat plate-like elongated piece, and the base end side forms an arc surface that exceeds a semi-circular arc. The inner wall of the annular concave portion at the tip is loosely inserted into a fitting hole continuous with the concave portion, and further, a pair of switching engagement claws formed of elongated pieces each have two engaging portions formed by steps at the tip, It is designed to engage and disengage with two teeth of the ratchet tooth portion provided on the outer circumference of the ratchet tooth portion. Since it is adapted to engage with the teeth of No. 3, there is certainty, and when the width and width of the conventional engaging pawl are the same, the area of contact between the engaging pawl and the tooth is doubled and the load strength is 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 projecting portion is removed, 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. Has the effect of.

[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]

 1 Main body 2 Handle 3,4 Annular part 5 Recessed part 6 Rotor 6a Ratchet tooth part 6b Square 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 part which is continuous on the outer periphery, a stepped part at the top and bottom, and a rotor provided with an angular shaft at one end are housed in a cocoon-shaped annular recess of the main body on the handle front end side, and the above and below of the rotor are Of the ratchet teeth, and the ratchet teeth are provided with a pair of engaging pawls opposed to each other with the switching cam interposed therebetween, and the engaging pawl is engaged with the ratchet teeth by the switching operation of the switching cam. In a ratchet wrench of a detachable type, each of the pair of engaging claws is formed by a plate-shaped strip, and two engaging portions that engage with the two teeth of the ratchet tooth portion are provided at the tip of each engaging claw. And a base end of the engaging claw is a ratchet wrench in which the base end of the engaging claw is an arc surface of a semi-arc surface or more which is loosely inserted into the circular recessed fitting holes provided at intervals on the inner wall of the annular recess of the main body.