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US Patent: 471,471
Pipe Wrench
Patentee:
Augustus L. Engelbach (exact or similar names) - Leadville, CO

USPTO Classifications:
81/106

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

Assignees:
None

Manufacturer:
Eagle Foundry and Machine Shop - Leadville, CO

Witnesses:
C. Sedgwick
F. McArdle
William H. Nash
J. F. Crawley
Patent Dates:
Applied: Jul. 06, 1891
Granted: Mar. 22, 1892

Patent Pictures:
Augustus L. Engelbach patent March 22, 1892
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Description:
Swinging hook jaw with a rectangular shank; the pivot point and effective working size is adjusted by a threaded rod within the handle.

Production information taken from Scientific American listing reprinted in "American Wrench Makers 1830-1930," by Ken Cope.

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