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CA Patent: CA-55,988
Chain Wrench
George Amborn - Brooklyn, NY
William Joseph Grinden - Brooklyn, NY

USPTO Classifications:

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

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

Not known to have been produced

S. J. Haviland
Geo. T. Pinckney
J. Staib
Chas. H. Smith

Patent Dates:
Applied: Mar. 04, 1897
Granted: May 19, 1897

Patent Pictures:
J.H. Williams & Co. (assignee of G. Amborn and W. J. Grinden) patent May 19, 1897 edited from CANADIAN PATENT OFFICE RECORD
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Canadian patent no. 55,988 in FLICKR
55,988 in Canadian Patents Database
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.

Corresponding U.S. patent no. 577,653 was issued February 23, 1897.

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