Ratchet wrench having constant drive

Details Ratchet wrench having constant drive Ratchet wrench having constant drive

2007-01-30

2007-01-30

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C081S057310

Reexamination Certificate

active

11318945

ABSTRACT:
Ratchet wrenches are provided that allow for drive on both the forward and return strokes of the ratchet handle. A combination ring gear, sun gear and planetary gear system is used in combination with a drive pawl arrangement to achieve power drive in both directions of operation, regardless of whether a tightening or loosening operation is desired. Accelerated speed of operation is attained upon the return stroke as a function of gear sizing. In other embodiments, the planetary gear system is replaced with an intermediate gear assembly external to any interengaging both a drive and driven gear. In other embodiments, the planetary gear system is replaced with an intermediate gear assembly external to and interengaging both a drive and driven gear.

REFERENCES:
patent: 2520443 (1950-08-01), Seaquist
patent: 2641136 (1953-06-01), Marsden, Jr. et al.
patent: 3983759 (1976-10-01), Linden
patent: 4357844 (1982-11-01), Welbon
patent: 4366731 (1983-01-01), Vallevand
patent: 4802387 (1989-02-01), Williams, III
patent: 4970915 (1990-11-01), Williams, III
patent: 5009132 (1991-04-01), Gilberto
patent: 5105688 (1992-04-01), Williams, III
patent: 5931062 (1999-08-01), Marcovici
patent: 6681660 (2004-01-01), Foard

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