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US Patent: 2,572,492
Method of Making Adjustable Jaw Wrenches
Karl F. W. Kempf - Buffalo, NY

USPTO Classifications:
72/341, 72/364, 76/114

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

McKaig-Hatch, Inc. - Buffalo, NY

Not known to have been produced

none listed

Patent Dates:
Applied: Sep. 11, 1948
Granted: Oct. 23, 1951

Patent Pictures:
Karl F. W. Kempf patent October 23, 1951
USPTO pdf tiff
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The patent is for the process of broaching a finished slide way for an adjustable jaw wrench. A careful examination of McKaig-Hatch wrenches of the period should reveal if this manufacturing process was employed.

Emil Neuhook - patent attorney

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