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US Patent: 2,966
Rack-Wrench
Patentee:
Jabez C. Terry - Springfield, MA

USPTO Classifications:
81/129.5

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

Assignees:
Solyman Merrick - Springfield, MA

Manufacturer:
Unknown

Witnesses:
A. G. Jannett
Justin Willard

Patent Dates:
Granted: Feb. 20, 1843

Patent Pictures:
Jabez C. Terry patent Feb. 20, 1843, with example from Don Ervin collection
USPTO pdf tiff
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Description:
The patent describes a spring-tensioned collar holding teeth on the interior of the sliding jaw in contact with teeth on the main bar of the wrench. This arrangement enables rapid adjustment.

An example corresponding to this patent appeared at auction March 28, 2009 (mjdtools, Indianapolis, IN, lot #700).

Another known example has an additional rotating knurled screw at the base of the sliding jaw so the wrench is both screw and rapid - adjusting. The known example is marked MERRICK'S PATENT SPRINGFIELD.

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