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US Patent: 247,987
Chain Wrench
William H. Brock - Corona, NY

USPTO Classifications:
16/204, 81/70

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

William H. Brock - Corona, NY
John W. Alexander - New York, NY

Not known to have been produced

Joseph Wynne
A. P. Hinman
Alexander H. Wright
Roswell W. Keene

Patent Dates:
Applied: Aug. 05, 1881
Granted: Oct. 04, 1881

Patent Pictures:
William H. Brock Patent October 4, 1881
USPTO pdf tiff
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The patent includes the shape of the slots holding the chain, and the reversible interchangeable jaw pieces.

This is the first of several patents cited on Brock's Chain wrenches. Other Brock chain wrench patents include nos. 250,641, 254,862, 298,442, 366,451, 389,685, 483,419. Some of them were assigned to J.H. Williams and Co.

In 1898, Curtis & Curtis of Bridgeport, CT was producing a Brock patent chain pipe wrench.

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