US Patent: 4,993,289
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| Drive Element with Drive Bore Having Compound Entry Surface
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Patentee:
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| James R. Parks (exact or similar names) - Franklin, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 13, 1990 |
| Granted: |
Feb. 19, 1991 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Emrich & Dithmar - patent attorneys
Abstract
A drive element includes a drive bore having an entry end within which is formed a sloping entry surface. The entry surface extends from an outer surface of the drive element partially into the drive bore and has discrete portions respectively inclined with respect to a central axis of the drive bore at different slopes. The sloping entry surface may include a portion with a continuously varying slope. A driver is disclosed for use with the drive element.
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