| 摘要 |
In a ratchet wrench, a frictional force generation mechanism including a first guide bush and a disc spring is attached to a shank with a locking pin to form a shank assembly. Spring force of the disc spring acts only on the inside of the shank assembly. The shank assembly is inserted from a central space of a first annular hold portion toward a second annular hold portion, and the shank is held by an inner wall of the second annular hold portion. In the back side on which the shank assembly is inserted, the drop-out of the shank assembly from the central space side of the first annular hold portion is prevented by a snap ring attached to a groove of the first annular hold portion. With this arrangement, constant friction is applied to the shank.
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