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US Patent: 523,810
Pipe Wrench
Patentee:
Charles Hall (exact or similar names) - New York, NY

USPTO Classifications:
81/109, 81/170

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : pipe and nut combination wrenches

Assignees:
None

Manufacturer:
Samuel Hall's Son - New York, NY

Witnesses:
Chas. H. Smith
J. Staib
A. M. Oliver
Geo. T. Pinckney

Patent Dates:
Applied: Mar. 05, 1894
Granted: Jul. 31, 1894

Patent Pictures: [ 1 | 2 | 3 ]
Charles Hall Pat. July 31, 1894
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Description:
This version of Hall's pipe wrench has the adjusting screw extending outside the frame, and a limit stop screw in the hook jaw. The extended adjusting screw appears in the smallest version of Hall's wrench, the 5 1/2" long "Bicycle Wrench" which came on the market in 1896.

Canadian patent CA-45,993 and British patent GB-189405231 registered March 13, 1894 correspond to this patent.

The other four U.S. patents relating to Hall's wrench are 516,485 (3/13/1894), 521,312 (6/12/1894), 553,295 (1/29/1895), and 586,738 (7/20/1897).

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