Torque driving tool and retainer for driven member

Details Torque driving tool and retainer for driven member Torque driving tool and retainer for driven member

1990-03-01

1990-11-20

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81451, B25B 1500

Patent

active

049709224

ABSTRACT:
A rotatable driving tool for imparting torque to a driven member, such as a threaded fastener having an axial recess in the head thereof, comprises a circularly cylindrical body with a plurality of substantially circularly helical driving portions projecting laterally therefrom and equiangularly spaced about the cylindrical axis, each of the driving portions having a small helix angle, preferably between one and three degress. The driving portions mate with lobes of the fastener recess but are slightly inclined with respect thereto to provide a wedge fit to retain the fastener in engagement with the tool body.

REFERENCES:
patent: 1863046 (1932-06-01), Githens et al.
patent: 2066132 (1936-12-01), Zihler
patent: 2538350 (1951-01-01), Baule
patent: 2800936 (1957-07-01), West
patent: 3865500 (1975-02-01), Newell
patent: 4187892 (1980-02-01), Simmons
patent: 4191228 (1980-03-01), Fenton
patent: 4269246 (1981-05-01), Larson et al.
patent: 4464957 (1984-08-01), Gill

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