Drive element with drive bore having compound entry surface

Details Drive element with drive bore having compound entry surface Drive element with drive bore having compound entry surface

1990-08-13

1991-02-19

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

811211, B25B 0000

Patent

active

049932896

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.

REFERENCES:
patent: 1329560 (1920-02-01), Thomas
patent: 2634642 (1953-04-01), Viets
patent: 2777353 (1957-01-01), Willis
patent: 3250157 (1966-05-01), Badger
patent: 3273430 (1966-09-01), Knudsen et al.
patent: 3295572 (1967-01-01), Wing
patent: 3713356 (1973-01-01), Knudsen
patent: 4126063 (1978-11-01), Palmer

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