US Patent: 389,400


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US Patent: 389,400

Wrench

Patentee:

Edward C. Mead (exact or similar names) - Elkhart, IN

USPTO Classifications:

408/240, 81/171

Tool Categories:

wrenches : wrench adjustment types : screw adjust wrenches

wrenches : tap wrenches and die stocks

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

F. L. Middleton

Walter Donaldson

John M. Monschein

Orville T. Chamberlain

Patent Dates:
Applied:	Feb. 29, 1888
Granted:	Sep. 11, 1888

Patent Pictures:

Edward C. Mead patent September 11, 1888

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Description:

A screw-adjusted sliding block adjusts the size of the opening. The adjusting screw has perimeter holes for a nail or wire to serve as a lever handle. A stiff spring is inserted between the sliding jaw and adjusting screw. The spring is intended to exert constant pressure and keep the jaws in contact with the work piece. The specifications describe this as a tap wrench.