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US Patent: 3,273,430
Wrench Sockets, Socket Drives and Similar Couplers
Patentees:
Raymond G. Knudsen (exact or similar names) - Kenosha, WI
James W. Price (exact or similar names) - Kenosha, WI
Gene E. Olson (exact or similar names) - 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
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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. (See Snap-On "FLANK DRIVE")

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.

The same drawing appears in patent no. 3,495,485. Cited in patent no. 3,675,516.

Harry C. Alberts - patent attorney

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