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US Patent: 3,208,319
Self-Adjusting Wrench
Patentees:
Benjamin F. Westby - Minneapolis, MN
Stanley L. Williamson - Minneapolis, MN

USPTO Classifications:
81/367, 81/374, 81/379

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Assignees:
None

Manufacturer:
Crestline, Inc. - Minneapolis, MN

Witnesses:
none listed

Patent Dates:
Applied: Nov. 20, 1961
Granted: Sep. 28, 1965

Patent Pictures: [ 1 | 2 ]
Benjamin F. Westby and Stanley L. Williamson patent September 28, 1965
USPTO pdf tiff
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Description:
A compression spring and friction rod in the handle provide automatic size adjustment. Alternative cam and screw-adjustment means are provided for adjusting the gripping pressure of the jaws.

Patent nos. 2,531,285, 2,589,511, 2,595,579 and 2,997,903 are cited as relevant prior art.

Known example marked KWIK-GRIP PAT. PENDING MADE IN U.S.A. Manufacturer identity inferred from contemporary print advertising and mention of CRESTLINE, Inc. in the patent specifications.

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