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US Patent: 4,776,244
Open-End Wrench
Gene E. Olson - Kenosha, WI
Paul B. Lemens - Kenosha, WI

USPTO Classifications:
81/119, 81/124.2

Tool Categories:
wrenches : nut wrenches

Snap-On Tools Corp. - Kenosha, WI

Not known to have been produced

none listed

Patent Dates:
Applied: Jun. 16, 1986
Granted: Oct. 11, 1988

Patent Pictures:
USPTO pdf tiff
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Snap-On Tools Company History
Emrich & Dithmar - patent attorneys


The open-end wrench has a pair of jaws with parallel planar jaw surfaces. In each jaw surface is a configured notch having a planar drive surface, a clearance surface and a spacing surface between the drive surface and the clearance surface. The two clearance surfaces are on segments of a circle having a diameter greater than the across-corners dimension of the fastener to be tightened by the wrench. The distance between the planes of the driving surfaces is slightly greater than the across-sides dimension of the fastener. The spacing surface in each notch is a segment of a circle having a relatively small radius of curvature and is tangent to the associated clearance surface.

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