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US Patent: 1,258,628
Wrench
Patentee:
Arthur James Whitfield - Boston, MA

USPTO Classifications:
81/105

Tool Categories:
wrenches : pipe wrenches

Assignees:
Trimont Manufacturing Company - Boston, MA

Manufacturer:
Trimont Manufacturing Company - Boston, MA

Witnesses:
William T. H. Salter
Charles C. Ely

Patent Dates:
Applied: Apr. 23, 1917
Granted: Mar. 05, 1918

Patent Pictures:
Arthur James Whitfield patent March 5, 1918 with 24 inch TRIMO pat 3-5-18 -- Doug Busch collection
USPTO pdf tiff
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Description:
The patent is an improvement to Whitfield's June 20, 1916 patent (no. 1,187,690). The bearing surfaces of the frame holding the movable jaw and the abutment on the handle are modified to discourage "spreading" of that portion of the frame.

TRIMO pipe wrenches were produced marked with this patent date.

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