Screwdriver having screw gripping feature

Details Screwdriver having screw gripping feature Screwdriver having screw gripping feature

1987-04-21

1988-10-25

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81444, B25B 2310

Patent

active

047794941

ABSTRACT:
A screw-gripping screwdriver includes a handle, a shaft composed of two blade members, a sleeve which is disposed coaxially about the blade members, and a tip. The blade members have inclined surfaces which cooperate with the sleeve so that, during movement of the sleeve along the blade members, a camming action occurs so that a relatively large movement of the sleeve causes a relatively small movement of the blade tips. In a preferred embodiment, each blade tip is an L-shaped portion, which in a first position of the sleeve adjacent to the handle, cooperates with the other one of the L-shaped portions to form a generally cruciform shape suitable for use with a Phillips head screw. In a second position, the sleeve has cammed the blade members toward one another so that the L-shaped portions are in frictional engagement with the interior walls of a cruciform opening in a Phillips head screw. In another embodiment, the blade tips are generally rectangular members suitable for use with a slot head screw. In a still further embodiment, the blade tip members have portions which are generally trapezoidal in shape suitable for use with a hexagonal opening in a hex head screw.

REFERENCES:
patent: 2445383 (1948-07-01), Barlow
patent: 2625971 (1953-01-01), Bier
patent: 3003528 (1961-10-01), Landau
patent: 3208489 (1965-09-01), Walker et al.
patent: 3224479 (1965-12-01), Osborn et al.
patent: 3288184 (1966-11-01), Kyser
patent: 3354919 (1967-11-01), Sugaya
patent: 3600984 (1971-08-01), Bihlmaier
patent: 3900057 (1975-08-01), Benitz
patent: 4078593 (1978-03-01), Benitz

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