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US Patent: 452,518
Frank S. Cook - Chicago, IL

USPTO Classifications:
81/101, 81/178, 81/185.2

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench components : wrench jaw components

Capitol Manufacturing Co. - Chicago, IL

Whitman and Barnes Mfg. Co. - Chicago, IL

L. Schlesinger
C. H. Gurney
Arthur Johnson
A. S. Wells

Patent Dates:
Applied: Jan. 19, 1891
Granted: May 19, 1891

Patent Pictures:
Frank S. Cook pat. May 19, 1891 with W&B Pat. May 19, 1891 (courtesy photo)
USPTO pdf tiff
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The major focus of the patent is the reversible jaw element with two wearing faces, and the related jaw structure allowing for inserting replaceable jaw elements. The patent appears with a "Stillson" type jaw in a pipe wrench produced by Whitman & Barnes. The concept, as refined in design patent D28,487, was used on a movable jaw structure in a later Whitman and Barnes pipe wrench.

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