US Patent: 4,776,244 - Open-End Wrench


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US Patent: 4,776,244

Open-End Wrench

Patentees:

Gene E. Olson (exact or similar names) - Kenosha, WI

Paul B. Lemens (exact or similar names) - Kenosha, WI

USPTO Classifications:

81/119, 81/124.2

Tool Categories:

wrenches : nut wrenches

Assignees:

Snap-On Tools Corp. - Kenosha, WI

Manufacturer:

Not known to have been produced

Witnesses:

none listed

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

Patent Pictures:

USPTO (New site tip)
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Snap-On Tools Company History

Description:

Emrich & Dithmar - patent attorneys

Abstract

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.