US Patent: 5,713,251 - Composite Box Wrench with Ratchet Module Insert


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US Patent: 5,713,251

Composite Box Wrench with Ratchet Module Insert

Patentees:

Gregory A. Zurbuchen (exact or similar names) - Kenosha, WI

Dean J. Iwinski (exact or similar names) - Muskego, WI

George Ulics (exact or similar names) - 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:

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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.