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US Patent: 68,168
Improvement in Wrenches
Patentee:
Theodore D. Christopher - Madison, IN

USPTO Classifications:
81/137

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
James H. White
Grenville P. Mellen

Patent Dates:
Granted: Aug. 27, 1867

Patent Pictures:
Theodore D. Christopher Pat. Aug. 27, 1867
USPTO pdf tiff
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Description:
A swinging catch-bar on the back side of the base of the movable jaw allows for quick adjustment. The screw-adjust portion of the movable jaw allows for final close adjustment.

An Oct 5, 1867 SCIENTIFIC AMERICAN write-up describes two alternate wrench forms based on this patent.

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