One-piece, open-end wrenching head with roughened jaws

Details One-piece, open-end wrenching head with roughened jaws One-piece, open-end wrenching head with roughened jaws

1991-11-27

1992-09-22

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

81186, B25B 1302

Patent

active

051487268

ABSTRACT:
The open-end wrenching head includes two jaws and a throat interconnecting the jaws. The jaws include planar jaw driving surfaces each with a roughened region thereon adjacent to the throat and an unroughened region adjacent to the outermost end of the jaw driving surface, each of the roughened and unroughened regions being constructed and arranged to engage a portion of a selected side of a fastener. The throat may include either an arcuate surface or two planar throat driving surfaces. Each of the roughened regions has a coefficient of friction substantially greater than that of the unroughened regions and may be formed by deposition of an abrasive material by any of a number of processes or by deformation of the jaw driving surface by any of a number of processes.

REFERENCES:
patent: 3133568 (1964-05-01), Reed
patent: 3242775 (1966-03-01), Hinkle
patent: 3616827 (1971-11-01), Stillwagaon, Jr.
patent: 3656522 (1972-04-01), Ingimarsson
patent: 4778730 (1988-10-01), Zucker
patent: 5074171 (1991-12-01), Annis et al.

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