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US Patent: 298,442
Chain Wrench
William H. Brock - Corona, NY

USPTO Classifications:

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


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

H. B. Hathaway
Thomas H. Barowsky

Patent Dates:
Applied: Feb. 02, 1884
Granted: May 13, 1884

Patent Pictures:
William H. Brock patent May 13, 1884
USPTO pdf tiff
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Brock was a prolific designer of chain pipe wrenches. He initially produced wrenches based on his early patents, then sold the company and patents.

The specifications note his previous patents (nos. 247,987, 250,641, and 254,862), and claim this design is better because the chain will stay hooked when the jaw is below the pipe, and the jaw is stronger where it attaches to the handle.

This patent was used by J.H. Williams and Company for many years, as the basis for an evolving series which became the VULCAN chain wrench. Williams noted this 1884 patent as the foundation of 25 years of chain wrench production during the introduction of the "VULCAN BI-JAW" chain wrench in 1910.

Brock later worked up a new series of designs and started another company to produce them.

Alexander N. Wright - patent attorney

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