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US Patent: 646,565
Pipe Wrench
Edward Wright - Worcester, MA

USPTO Classifications:
81/103, 81/135

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


Hammond Mfg. Co. - Boston, MA

Ella P. Blenus
Simeon E. King
Chas. H. Burleigh

Patent Dates:
Applied: Aug. 25, 1899
Granted: Apr. 03, 1900

Patent Pictures: [ 1 | 2 ]
Edward Wright patent April 3, 1900
USPTO pdf tiff
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A spring-loaded lever between the movable jaw and shank is the adjusting means. The lever has teeth that mesh with rack teeth on the movable jaw. The overall design of the wrench is similar to the Stillson style pipe wrench evolved from Daniel Stillson's Oct. 12, 1869 patent (no. 95,744).

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