Manually operated gear wrench

Details Manually operated gear wrench Manually operated gear wrench

1987-02-26

1988-04-05

Meislin, Debra

Tools

Wrench, screwdriver, or driver therefor

Machine

81 581, 81 61, 74421R, B25B 1700, B25B 1346

Patent

active

047351195

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.

REFERENCES:
patent: 732108 (1903-06-01), Osborne
patent: 1648134 (1927-11-01), Kientz
patent: 2520443 (1950-08-01), Seaquist
patent: 2756792 (1956-07-01), Hirschman
patent: 3979965 (1976-09-01), Vuceta
patent: 4535653 (1985-08-01), Coburn

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