Open end wrench

Details Open end wrench Open end wrench

1993-04-22

1995-04-18

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

81186, B25B 1308

Patent

active

054068681

ABSTRACT:
An open-end wrench is disclosed which can be used with a variety of fastener head shapes and which reduces marring or rounding-off of the corners of the fastener head. The wrench has a wrench cavity for receiving the fastener. The wrench cavity includes offset convex drive surfaces which have a radius of curvature equal to half of the fastener head width. Clearance surfaces are provided adjacent to and in continuously curving contact with the drive surfaces to accept the corners of the fastener head when force is applied to turn the fastener.

REFERENCES:
patent: 2685219 (1954-08-01), Diebold
patent: 3242775 (1966-03-01), Hinkle
patent: 3908488 (1975-09-01), Andersen
patent: 3908489 (1975-09-01), Yamamoto et al.
patent: 4512220 (1985-04-01), Barnhill, III et al.
patent: 4581957 (1986-04-01), Dossier
patent: 4765211 (1988-08-01), Colvin
patent: 4930378 (1990-06-01), Colvin
patent: 5239899 (1993-08-01), Baker

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