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US Patent: 4,139,939
Utility Knife
Patentee:
George C. Crooks - Sturbridge, MA

USPTO Classifications:
30/162, 30/2

Tool Categories:
knives and cutters : utility knives

Assignees:
Hyde Mfg. Co. - Southbridge, MA

Manufacturer:
Hyde Mfg. Co. - Southbridge, MA

Witnesses:
none listed

Patent Dates:
Applied: Nov. 07, 1977
Granted: Feb. 20, 1979

Patent Pictures:
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Description:
Abstract

An utility knife comprising a two part housing, a slidable blade therein, means restricting the blade to a relatively small projection from the housing, spring means normally retracting the blade to fully housed condition within the housing, an exterior thumb piece to slide the blade, frangible means on the thumb piece acting as a stop which when removed allows the blade to project to a greater degree, and means for holding a spare blade in the casing.

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