Tools – Wrench – screwdriver – or driver therefor – Plural pivoted jaws and handle-lever
Patent
1992-11-03
1994-02-01
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Plural pivoted jaws and handle-lever
81 582, B25B 1328
Patent
active
052828301
ABSTRACT:
A self-ratcheting wrench for applying torque to a polygonal cross-section body such as a bolt or nut has an elongated handle terminated at one end thereof by a head having an opening adapted to receive the nut. A plurality of three-sided pawls pivotable in a transverse plane are arranged around the opening and spring biased to place a flat face wall of the pawls against the flat sides of alternate nut faces. Motion of each pawl radially inward into the nut-receiving opening is limited by abutting contact of a first inner side wall of each pawl with a triangular-shaped stop, the abutting contact also providing means for transmitting torque applied to the handle of the wrench to the pawl and contacting nut. In the preferred embodiment, the second side wall of each pawl is convexly curved, and intersects the face wall of the pawl at an obtuse angle, both characteristics serving to facilitate sliding motion of the pawls over the faces of the nut when the wrench is orbited in a direction opposite to a torque-applying direction, during which ratcheting action pawls are pivoted radially outwards against spring tension.
REFERENCES:
patent: 2700315 (1955-01-01), Hermanson
patent: 3906822 (1975-09-01), Hertelendy et al.
patent: 4644830 (1987-02-01), Bailey et al.
Chapin William L.
Smith James G.
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