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US Patent: 28,300
Improved Slide Wrench
Patentee:
George B. Phillips - Newark, NJ

USPTO Classifications:
269/226, 269/240, 81/155, 84/291

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

Assignees:
None

Manufacturer:
George B. Phillips - Newark, NJ

Witnesses:
Elias W. Cobb
Asa S. Cobb
Charles E. Lewis
J. E. Dennis

Patent Dates:
Granted: May 15, 1860

Patent Pictures: [ 1 | 2 ]
George B. Phillips patent May 15, 1860
USPTO pdf tiff
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Description:
Spiral teeth cut in the face of the adjusting knurl engage a rack of teeth cut in the shank of the wrench to move the adjustable jaw. This adjusting knurl, the wrench's curved handle, and the angled jaw opening combine to give this tool a unique appearance. The example in the 2nd image has pipe gripping teeth on the "fixed" jaw.

A photo of the patent model (damaged in a Patent Office fire) appears on page 144 of "Tools: Rare and Ingenious" by Sandor Nagyszalanczy (Taunton Press, 2004).

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