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US Patent: 320,172
Wrench
Patentee:
Squire Robinson - Southington, CT

USPTO Classifications:
81/171

Tool Categories:
wrenches : nut wrenches

Assignees:
None

Manufacturer:
Peck, Stow & Wilcox Co. - Southington, CT

Witnesses:
Eddy N. Smith
James Shepard
John Edwards, Jr.

Patent Dates:
Applied: Jul. 22, 1884
Granted: Jun. 16, 1885

Patent Pictures: [ 1 | 2 | 3 | 4 ]
Squire Robinson Pat. June 16, 1885
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Description:
The patent focuses on the attachment between the adjusting screw and its supporting ferrule. The adjusting screw is held in place by the supporting shoulders on the ferrule, and the spring-loaded pivot pin. Many examples marked "Robinson Patent June 16, 1885" in an oval border. A 12-inch example marked P.S.&W. (Peck, Stow & Wilcox) WARRANTED with the patent date is also known. Peck, Stow & Wilcox was advertising Robinson's Patent Steel Bar Wrench in 1894.

The ferule with supports on both side of the "rosette" is the subject of Robinson's May 27, 1884 patent (no. 299,165).

An April 9, 1895 Amos Shepard wrench handle patent assigned to Peck, Stow & Wilcox (pat. no. 537,239) has a Robinson style adjusting screw included in the drawing.

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