Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1996-07-22
2000-09-12
Scherbel, David A.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
81 632, 192 44, B25B 1300
Patent
active
061161195
ABSTRACT:
A reversible drive mechanism for socket wrenches, having a detented selector cap thereon. The socket driving post of the wrench is fixedly attached to a triangular shaft rotatably contained within an internal cylindrical bearing surface, which in contained within the head of the wrench handle. Each face of the triangular shaft is a convex arc-shaped surface, and the cylindrical surface and the convex surfaces create between them three lune-shaped spaces. Each of the convex faces on the triangular shaft has tiltably mounted thereon a U-shaped fixture, which loosely contains within its arms a cylindrical roller. As the selector cap is rotated back and forth between selector positions, each U-shaped fixture tips back and forth on its respective convex face, and shifts the contained roller from one extreme to the other of its respective lune-shaped space. Each roller, when shifted, moves from being closely contained on one side of its lune-shaped space to being closely contained on the other side of its space and, when the wrench handle is rotated, the roller is frictionally wedged between the cylindrical surface and the convex shaft face, forcing the driving post and a socket mounted thereon in the desired direction. The lost motion of the wrench handle is reduced to less than 11/2 degrees.
REFERENCES:
patent: 4004666 (1977-01-01), Hinojosa
patent: 4884478 (1989-12-01), Lieser
patent: 4987803 (1991-01-01), Chern
patent: 5136901 (1992-08-01), Williams
Day Jack E.
Scherbel David A.
Wilson Lee
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