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US Patent: 577,653
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:
Not known to have been produced

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

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 specifications note that "cable chain" is preferable for working with fittings and other irregular forms related to pipe where flat chain is better suited for pipe.

The side plates connect to the handle with dovetails; the bolt's primary function is to keep the jaws in position rather than carrying the strain. The free end of the chain connects to the handle behind the attachment point for the fixed end of the chain to avoid potential for the chain to "lock" on pipe.

Williams' chain wrenches incorporated aspects of multiple patents, and in the absence of patent markings on the tools or patent citations in advertising, etc. it is a challenge to connect features of the tools to specific patents.

Corresponding Canadian patent no. CA-55,988 issued May 19, 1897 provides Grinden's full name.

The specifications relate the link chain version to patent no. 499,508.

Patent no. 577,654 is a parallel patent relating to an alternate attachment pin for the fixed end of a cable chain.

L. W. Terrell & son - patent attorneys

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