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US Patent: 3,273,430
Wrench Sockets, Socket Drives and Similar Couplers
Patentees:
Raymond G. Knudsen - Kenosha, WI
James W. Price - Kenosha, WI
Gene E. Olson - Kenosha, WI

USPTO Classifications:
81/124.6

Tool Categories:
wrenches : socket wrenches

Assignees:
Snap-On Tools Corp. - Kenosha, WI

Manufacturer:
Snap-On Tools Corp. - Kenosha, WI

Witnesses:
none listed

Patent Dates:
Applied: Nov. 06, 1963
Granted: Sep. 20, 1966

Patent Pictures: [ 1 | 2 ]
Raymond G. Knudsen, James W. Price and Gene E. Olson patent Sept. 20, 1966
USPTO pdf tiff
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Snap-On Tools Company History
Description:
The central principle in patent no 3,273,430 is a geometry whereby wrench sockets, etc. grip hexagonal nuts on the flats rather than the corners. There are no sharp inside corners in this geometry. This avoids "rounding " the nut corners and sharp corners in the sockets which lead to stress cracks and breakage. The patent number appears on a wide range of Snap-On sockets, box end wrenches and the like.

U.S. Patent nos. 2,445,905, 2,961,905, 3,079,819 and 3,125,910 along with three foreign patents are cited as relevant prior art.

Harry C. Alberts - patent attorney

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