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US Patent: 902,799
Ralph S. Barrett - Indianapolis, IN

USPTO Classifications:
269/242, 81/163, 81/177.1

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

Leo M. Barrett - Indianapolis, IN

Leo M. Barrett - Indianapolis, IN

J. H. Gardner
K. R. Woddell
E. T. Silvius
Harry D. Pierson

Patent Dates:
Applied: Jul. 17, 1908
Granted: Nov. 03, 1908

Patent Pictures:
Ralph S. Barrett patent Nov. 3, 1908
USPTO pdf tiff
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The patent covers multiple details of the construction. Two prominent features are the adjusting screw with right- and left-hand threads, and the side flanges which protect the handle and adjuster from some incidental damage.

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