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US Patent: 516,485
Pipe Wrench
Patentee:
Charles Hall - New York, NY

USPTO Classifications:
81/109, 81/170

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

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

Witnesses:
Chas. H. Smith
J. Staib
William G. Mott
Harold Serrell

Patent Dates:
Applied: Nov. 13, 1893
Granted: Mar. 13, 1894

Patent Pictures: [ 1 | 2 ]
Charles Hall Pat. Mar. 13, 1894
USPTO pdf tiff
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Description:
The hook jaw can swing back far enough to allow the "grip" on the fixed jaw to be sharpened. The adjusting screw can be removed and replaced.

Hall secured four additional patents for improvements and refinements -- 521,312 (6/12/1894), 523,810 (7/31/1894), 533,295 (1/29/1895), and 586,738 (7/20/1897).

The 5.5 inch Hall "Bicycle" wrench with the adjusting screw terminating in a knob at the end of the handle is pictured with this patent. Other pictures of Hall wrenches are attached to the entry for pat. no. 533,295.

Hall also patented a soft-jaw "clamp" for ornamental and polished pipe to complement this wrench (Pat. No. 527,200).

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