US Patent: 3,273,430
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| Wrench Sockets, Socket Drives and Similar Couplers
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Patent Dates:
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| Applied: |
Nov. 06, 1963 |
| Granted: |
Sep. 20, 1966 |
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Patent Pictures:
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Raymond G. Knudsen, James W. Price and Gene E. Olson patent Sept. 20, 1966 |
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Stan Schulz
Snap-On Tools Company History
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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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