Power wrench

Details Power wrench Power wrench

1990-04-09

1991-01-29

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 591, 192 45, B25B 1346

Patent

active

049878026

ABSTRACT:
A power wrench includes a socket which is rotatably retained in a head portion of the wrench by a retainer. A yoke is actuated to swing by a driving axle. A number of grooves are formed in the yoke and in the retainer, each groove gradually changes from narrow to wide and receives a roller and a spring. The rollers slidably contact the socket. When the yoke rotates in one direction, the socket is actuated to rotate. When the yoke rotates in a reverse direction, the rollers in the retainer are caused to hold the socket and prevent the socket from backlash.

REFERENCES:
patent: 3621739 (1971-11-01), Seablom
patent: 4051935 (1977-10-01), Nakayama
patent: 4603606 (1986-08-01), Headen
patent: 4722252 (1988-02-01), Fulcher et al.

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