Ratchet wrench for accommodating both English and metric-sized w

Details Ratchet wrench for accommodating both English and metric-sized w Ratchet wrench for accommodating both English and metric-sized w

1984-06-29

1986-03-11

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

81 582, B25B 1346

Patent

active

045746656

ABSTRACT:
A ratchet wrench comprising a generally cylindrical and flat head having an opening in its center for engaging workpieces. Interiorly of the head are two sets of cusps which are sized to receive certain cams; the inner cusps are adapted to transmit torque to a workpiece, and the outer cusps provide clearance when the wrench is being rotated in a non-driving direction. A pair of face plates are affixed respectively to opposite sides of the head so as to form front and rear face plates; the face plates are affixed to the head with mechanical fasteners that are spaced sufficiently close so that adjacent fasteners are no more than 3/4 inch apart. A plurality of work-contacting cams are mounted between the face plates and arranged to be generally co-extensive and parallel. The cams collectively have a first set of ends adjacent the front face plate, and a second set of ends adjacent the rear face plate; and at least one of the two sets of cams ends are beveled so as to foster the entry of a workpiece into the central opening in the wrench head. The beveled ends of the cams preferably have a textured surface so as to foster frictional interaction with the workpiece at the time that engagement is being effected.

REFERENCES:
patent: 2550010 (1951-04-01), Kavalar
patent: 2592781 (1952-04-01), Yavner
patent: 2896488 (1959-07-01), Ahana

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