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US Patent: 274,545
Frank Armstrong - Bridgeport, CT
John H. Hine - Bridgeport, CT

USPTO Classifications:
81/134, 81/356, 81/413, 81/427

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

Frank Armstrong - Bridgeport, CT

Not known to have been produced

A. M. Wooster
T. Walter Fowler
Geo. S. Lester
F. W. Smith

Patent Dates:
Applied: Jan. 30, 1883
Granted: Mar. 27, 1883

Patent Pictures:
Frank Armstrong and John H. Hine patent March 27, 1883
USPTO pdf tiff
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The movable jaw slides, and is held in place by a tooth on the swinging handle that engages a rack on the shank. The spring between the jaw and lever handle keeps the jaw faces parallel.

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