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US Patent: 455,821
Wrench
Patentee:
Frederick F. Schofield - Oscoda, MI

USPTO Classifications:
81/145

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John Schuman
John F. Miller
Orin Cutcheon
G. H.E. Hawkins

Patent Dates:
Applied: Nov. 28, 1890
Granted: Jul. 14, 1891

Patent Pictures:
Frederick F. Schofield patent July 14, 1891
USPTO pdf tiff
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Description:
The interior has rack teeth, with a spring-loaded toothed bar on the shank of the movable jaw engaging the rack for adjustment. The "button" to depress the toothed bar is threaded, and can be tightened to hold the adjustment.

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