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US Patent: 274,544
Wrench
Patentee:
Frank Armstrong - Bridgeport, CT

USPTO Classifications:
81/134, 81/356, 81/359, 81/409.5

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

Assignees:
None

Manufacturer:
Armstrong Mfg. Co. - Bridgeport, CT

Witnesses:
W. T. Haviland
F. W. Smith, Jr.

Patent Dates:
Applied: Feb. 02, 1883
Granted: Mar. 27, 1883

Patent Pictures: [ 1 | 2 | 3 ]
Frank Armstrong Pat. Mar. 27, 1883
USPTO pdf tiff
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Description:
This quick-adjust pipe wrench is based on Dan P. Foster's Dec. 9, 1879 patent (No. 222,484). It uses a slide with a spring-loaded pawl instead of a knurl for the adjustment mechanism.

This patent is noted in an unrelated later Armstrong wrench patent (no. 335,986).

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