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US Patent: 1,490,902
Pliers, Wrench or the Like
Allen C. Allan - Baraboo, WI

USPTO Classifications:

Tool Categories:
wrenches : pliers type wrenches


Allan-Diffenbaugh Wrench & Tool Co. - Baraboo, WI
Kant Slip P & T. Co - Chicago, IL


Patent Dates:
Applied: Apr. 18, 1922
Granted: Apr. 22, 1924

Patent Pictures: [ 1 | 2 ]
Allen C. Allan Pat. April 22, 1924
USPTO pdf tiff
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The shape of the handles, and of the intersection of the handles, makes the tool self-adjusting. The small hinged piece narrows the slot effectively creating two size ranges. Plier wrenches employing this patent have a sliding joint with no pivot bolt.

Used in conjunction with Allan's April 1920 and August 1921 patents (nos. 1,337,986 and 1,386,149) for the KANT-SLIP line of plier wrenches.

A version including a pivot bolt and more closely resembling conventional pliers appears to match patent no. 1,873,805 granted Aug. 23, 1932.

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