Alfred A Riley

US Patent:

47351195, Apr 5, 1988

Filed:

Feb 26, 1987

Appl. No.:

7/019111

Inventors:

Alfred B. Riley - Kensington MD

International Classification:

B25B 1700
B25B 1346

US Classification:

81 573

Abstract:

A manually operated gear wrench having a fixed hand plate and a wrench plate rotatably mounted thereon. The wrench plate carries a ring gear which meshes with a pinion gear rotatably mounted on the hand plate. Studs adapted to selectively receive socketed handles and tools are connected to the pinion gear and wrench plate. By connecting an operating handle to the pinion stud and a tool to the wrench plate stud, an input to output ratio of 3:1 is obtained. By connecting the operating handle to the wrench plate stud and the socketed tool to the pinion stud, an input to output ratio of 1:3 is obtained. A releasable locking mechanism is provided between the hand plate and pinion gear to prevent relative rotation between the pinion gear and ring gear to thereby provide an input to output ratio of 1:1.