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US Patent: 639,785
Pipe Wrench
Patentee:
John C. Speirs - Worcester, MA

USPTO Classifications:
81/177.1, 81/93

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Philip W. Southgate
Louis W. Southgate
W. J. Baldwin
E. M. Healy

Patent Dates:
Applied: Mar. 14, 1898
Granted: Dec. 26, 1899

Patent Pictures:
John C. Speirs patent Dec. 26, 1899
USPTO pdf tiff
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Description:
Rocking movement of the movable jaw to prevent "locking" on the pipe is made possible by the curved surface of the "nut" in the base of the movable jaw, and a spring which tips the movable jaw away from the shank.

Compare this to Edward Wright's June 30, 1896 patent no. 562,878.

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