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US Patent: 499,920
Adjustable Wrench
Patentees:
Willard H. Griffin (exact or similar names) - Henniker, NH
Elmer P. Nichols (exact or similar names) - Henniker, NH

USPTO Classifications:
279/30, 81/114

Tool Categories:
wrenches : brace wrenches
wrenches : socket wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
F. S. Berry
W. B. Howe
J. B. Thurston
Carrie E. Evans

Patent Dates:
Applied: Mar. 18, 1893
Granted: Jun. 20, 1893

Patent Pictures:
Willard H. Griffin and Elmer P. Nichols patent June 20, 1893
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Description:
Adjustable brace socket wrench; the jaws have a spring to open them and taper on the outside to set the size; a screw collar on the outside of the frame acts as the size adjustment.

This looks more robust than parallel patent 499,919.

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