US Patent: 274,544


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US Patent: 274,544

Wrench

Patentee:

Frank Armstrong (exact or similar names) - 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 Manufacturing 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

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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).