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US Patent: 257,468
Wrench
Patentee:
Matthew E. Campfield - Cleveland, OH

USPTO Classifications:
81/171

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

Assignees:
None

Manufacturer:
Cleveland Screw Wrench Co. - Cleveland, OH
Lamson & Sessions Co. - Cleveland, OH
Brown Specialty Mfg. Co. - Etna, PA

Witnesses:
F. R. Tibbrillo
M. G. Norton
Geo. W. Tibbitts
E. W. Laird

Patent Dates:
Applied: Mar. 29, 1882
Granted: May 09, 1882

Patent Pictures: [ 1 | 2 ]
Matthew E. Campfield Pat. May 9, 1882
USPTO pdf tiff
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Description:
The main focus of the patent is the form of the adjusting screw and its attachment to the supporting ferule and shank. The specifications note two alternate modes of connecting the screw shaft and head of the adjusting screw. The patent drawing shows them riveted together; the specifications note they can also be "forced" together.

Ken Cope's "American Wrench Makers 1830-1930" identifies the Brown Specialty Mfg. Co. of Etna, PA as one manufacturer.

The Cleveland Screw Wrench Co. example shown in the 2nd image has the the screw and nut "forced" together, and the wrench shank extends through the wood handle to terminate in a screwed on nut.

Campfield's August 12, 1884 patent (no. 303,385) describes another method for constructing the adjusting screw which might be the method employed for the Cleveland Screw Wrench Company adjusting screws.

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