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US Patent: 431,236
Monkey Wrench
Richard Wayland Smith - Kenwood, NY

USPTO Classifications:
81/105, 81/DIG.6

Tool Categories:
wrenches : nut wrenches
wrenches : ratchet wrenches

Richard Wayland Smith - Kenwood, NY
Francis Wayland Smith - Kenwood, NY

Not known to have been produced

A. F. Walz
J. J. Laasz
C. E. Bloom
V. P. Hinds

Patent Dates:
Applied: Mar. 05, 1890
Granted: Jul. 01, 1890

Patent Pictures:
Richard Wayland Smith patent July 1, 1890
USPTO pdf tiff
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The adjustable jaw is hinged to the shank of the stationary jaw; the frame holding the movable jaw and adjusting nut is pressed against the stationary jaw and shank by a heavy leaf spring. This would allow for a kind of ratchet action as the jaws would open on "reverse" motion.

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