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US Patent: 5,117,714
One-Piece, Open-End Wrenching Head with Serated Jaws
Patentees:
William T. Pagac - Kenosha, WI
Frank Mikic - Kenosha, WI
Thomas S. Severson - Kenosha, WI
Douglas M. Sorbie - Salem, WI

USPTO Classifications:
81/119, 81/121.1

Tool Categories:
wrenches : nut wrenches

Assignees:
Snap-On Tools Corp. - Kenosha, WI

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Mar. 05, 1990
Granted: Jun. 02, 1992

Patent Pictures:
USPTO pdf tiff
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Snap-On Tools Company History
Description:
Emrich & Dithmar - patent attorneys

Abstract

The open-end wrenching head includes two jaws and a throat interconnecting the jaws. The jaws include planar jaw driving surfaces each with at least one serrated region thereon 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 having serrated regions thereon. Each of the serrated regions on the driving surfaces may include symmetrical or asymmetrical grooves. The plane of these grooves may be parallel to the driving surfaces or at an angle of about 1° to 3°.

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