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US Patent: 335,986
Wrench
Patentees:
Frank Armstrong - Bridgeport, CT
Nathaniel W. Vandegrift - Bridgeport, CT

USPTO Classifications:
81/139

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Jos. S. Latimer
David H. Mead
Frank T. Staples
P. L. Holzer

Patent Dates:
Applied: Jun. 24, 1885
Granted: Feb. 09, 1886

Patent Pictures:
F. Armstrong and N.W. Vandegrift patent February 9, 1886
USPTO pdf tiff
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Description:
A thumb lever at the base of the movable jaw lifts a toothed clamping block inside the jaw. The teeth engage fine teeth on the face of the main bar. Contrast this construction to "Atwater's Tiger" (patent no. 284,162) where the jaw is held by the cam action of an eccentric disk.

The specifications note Armstrong's previous patent (no. 274,544).

The British equivalent patent GB-188601870 was registered Febr. 9, 1886.

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