US Patent: 3,675,516
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| Wrench Splines, Spline Drives and Similar Couplers
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Patent Dates:
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| Applied: |
Apr. 10, 1968 |
| Granted: |
Jul. 11, 1972 |
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Patent Pictures:
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Raymond G. Knudsen et al patent July 11, 1972 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| One of the underlying principles is the socket bears on "faces" rather than corners -- as in patent no. 3,273,430. 12-point splined sockets were widely discussed in mid-1970s trade journals, and a wide variety of new and used SNAP-ON splined sockets are available in online auction venues.
Harry C. Alberts - patent attorney
Abstract
The invention involves multisided and specially shaped jaws or splines in wrench sockets or other rotary drivers or couplers configurated around an internal periphery to present uniformly spaced flat driving sides, jaws, or flanks for flat surface-to-surface engagement to impart torque turning loads to complemental flat multifaced externally polygonal fastener faces or driven coupler elements rather than to the corners thereof, and to accommodate hexagon, double hexagon, triple square, and complementally fluted or fluted or multi-splined nuts and the like. The internal and radially extending peripheral splines are configurated to present specially angulated engaging jaw sides or flanks with intervening and alternately spaced complemental grooves for flat surface engagement with the sides of either hexagon, double hexagon, triple square, or complementally splined nuts or the like without any corner engagement therewith.
Patent nos. 3,273,430, 3,495,485, 3,354,757 and French patent FR-1012053 are cited as references.
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