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US Patent: 546,443
Pipe Wrench
Patentee:
Edward Wright - Worcester, MA

USPTO Classifications:
81/103

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

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Simeon E. King
S. R. Barton
Ella P. Blenus
Chas. H. Burleigh

Patent Dates:
Applied: Feb. 09, 1895
Granted: Sep. 17, 1895

Patent Pictures: [ 1 | 2 ]
Edward Wright patent September 17, 1895
USPTO pdf tiff
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Description:
Screw adjust pipe wrench, with the movable jaw including a frame that wraps around the main shank. The adjusting nut fits between two projections from the main shank, and includes holes for insertion of small levers to increase the force applied to the adjusting screw.

A known example has no discernible markings.

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