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US Patent: 1,293,734
Pipe Wrench
Patentee:
William S. DuCharme - Cleveland, OH

USPTO Classifications:
81/147

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
None

Manufacturer:
Efficient Vise and Wrench Co. - Cleveland, OH

Witnesses:
S. W. Brainard
John A. Bommhardt
G. W. Rosenberg

Patent Dates:
Applied: Sep. 27, 1918
Granted: Feb. 11, 1919

Patent Pictures: [ 1 | 2 ]
William S. DuCharme patent Febr. 11, 1919
USPTO pdf tiff
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EFFICIENT PIPE WRENCH 1920 advertisement (FLICKR)
Description:
The wrench has an alligator-jaw type action with teeth on the fixed jaw, and a smooth surface on the movable jaw. The movable jaw is held by rack teeth on the back of the main bar and a compression spring inside the jaw.

Ads in the 1920 and 1921 issues of PLUMBER'S TRADE JOURNAL notes five sizes in production.

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