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US Patent: 577,654
Chain Wrench
Patentees:
William Joseph Grinden - Brooklyn, NY
George Amborn, Jr. - Brooklyn, NY

USPTO Classifications:
81/70

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches

Assignees:
J. H. Williams & Co. - Brooklyn, NY

Manufacturer:
J. H. Williams & Co. - Brooklyn, NY

Witnesses:
Louis A. Wendt
William C. Redfield
J. Staib
Charles H. Smith

Patent Dates:
Applied: Apr. 01, 1896
Granted: Feb. 23, 1897

Patent Pictures:
William J. Grinden and George Amborn, Jr. patent February 23, 1897
USPTO pdf tiff
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Description:
The focus in this patent is the shape of the "forked" double jaw structure and the pin that holds the fixed end of the chain. The overall wrench structure is similar to that in patent no. 577,653.

Williams' chain wrenches incorporated aspects of multiple patents, the Febr. 23, 97 patent date appears on some models of Williams' VULCAN chain wrenches.

Corresponding Canadian patent no. CA-55,989 issued May 19, 1897 has the patentee names mis-spelled, and supplies Grinden's full name.

Lemuel W. Terrell - patent attorney

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