US Patent: 5,148,726 - One-Piece, Open-End Wrenching Head with Roughened Jaws


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US Patent: 5,148,726

One-Piece, Open-End Wrenching Head with Roughened Jaws

Patentees:

David A. Huebschen (exact or similar names) - Kenosha, WI

William T. Pagac (exact or similar names) - Kenosha, WI

Frank Mikic (exact or similar names) - Kenosha, WI

Thomas S. Severson (exact or similar names) - Auburn Hills, MI

Douglas M. Sorbie (exact or similar names) - Kenosha, WI

USPTO Classifications:

81/119, 81/186

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:	Nov. 27, 1991
Granted:	Sep. 22, 1992

Patent Pictures:

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Snap-On Tools Company History

Description:

Emrich & Dithmar - patent attorneys

The portion of the term of this patent subsequent to June 2, 2009 has been disclaimed.

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.