US Patent: 3,208,319
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Self-Adjusting Wrench
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Patentees:
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Benjamin F. Westby (exact or similar names) - Minneapolis, MN |
Stanley L. Williamson (exact or similar names) - Minneapolis, MN |
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Patent Dates:
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Applied: |
Nov. 20, 1961 |
Granted: |
Sep. 28, 1965 |
Patent Pictures:
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Benjamin F. Westby and Stanley L. Williamson patent September 28, 1965 |
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Stan Schulz
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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. In the late 1960s, CRESTLINE was located in Little Falls, MN.
Patent no. 6,776,072 is a 21st Century "descendant" produced as the HART Auto Adjusting Locking Pliers. |
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