Screw driver bit

Details Screw driver bit Screw driver bit

1975-03-04

1976-03-16

Smith, Al Lawrence

Bridges

145 50R, 145116R, 408226, B25B 1500

Patent

active

039439860

ABSTRACT:
A screw driver bit for use with power screw drivers having at the mounting end thereof three equiangularly spaced axial recesses which form three equiangularly spaced drive surfaces for engagement by mating surfaces within a drive socket in the power screw driver.

REFERENCES:
patent: 118178 (1871-08-01), Arnold
patent: 1043098 (1912-11-01), Gross
patent: 2071050 (1937-02-01), Underwood et al.
patent: 2527492 (1950-10-01), Cleary et al.

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