Non-slip screwdriver

Details Non-slip screwdriver Non-slip screwdriver

1987-10-22

1989-01-31

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 2308

Patent

active

048007889

ABSTRACT:
A non-slip screwdriver head mechanism is taught. Briefly stated, an inner ferrule is spring biased, in telescoping fashion, inside an outer ferrule. The outer ferrule is held onto the screwdriver shaft through the use of a compressible bushing. The inner ferrule extends beyond the outer ferrule and the screwdriver blade and has a cup-type bore at its free end. By placing the cup end over a screw head, the non-slip screwdriver captures the screw head. The blade is then urged into engagement with the slot on the screw head.

REFERENCES:
patent: 1426320 (1922-08-01), Reid
patent: 1782565 (1930-11-01), Dohnal
patent: 2954809 (1960-10-01), Loewy
patent: 3245446 (1966-04-01), Morifuji
patent: 3517714 (1970-06-01), Desbarats

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