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US Patent: 5,713,251
Composite Box Wrench with Ratchet Module Insert
Patentees:
Gregory A. Zurbuchen - Kenosha, WI
Dean J. Iwinski - Muskego, WI
George Ulics - Gladwin, MI

USPTO Classifications:
81/61, 81/900

Tool Categories:
wrenches : ratchet wrenches
wrenches : nut wrenches

Assignees:
Snap-On Technologies, Inc. - Lincolnshire, IL

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Jan. 17, 1997
Granted: Feb. 03, 1998

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

Abstract

A double-ended ratcheting box end wrench includes a body formed entirely of glass-fiber-reinforced plastic material with box-type ratcheting inserts molded at opposite ends of the body. The body includes layers of random discontinuous glass-fiber-reinforced plastic material and a band of unidirectional continuous glass-fiber-reinforced plastic material. The body is subjected to a compression molding process embedded within which are the ratcheting inserts to form a composite wrench structure. Each insert includes a two-part housing in which are disposed a ratchet gear, a pawl and a bias spring.

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