Curvilinear drive screwdriver and screw

Details Curvilinear drive screwdriver and screw Curvilinear drive screwdriver and screw

1992-10-20

1993-12-14

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81186, 411403, B25B 1502

Patent

active

052692094

ABSTRACT:
A screwdriver and screw may be used in combination or with conventional screws and screwdrivers. The screwdriver has a head with forward and rearward faces. Curved driving surfaces on the faces extend from left and right side edges toward a longitudinal axis of the screwdriver. The screw has a slot with equal and opposite faces which are convex curved surfaces. The screw also has a bottom with protruding retainer lips and shoulders which extend upward along a side edge of each face for maintaining the driver in the slot. The bottom is a convex curved surface.

REFERENCES:
patent: 3178988 (1965-04-01), Borup
patent: 4338835 (1982-07-01), Simons
patent: 4873900 (1989-10-01), Ciumaga
patent: 4889020 (1989-12-01), Baker
patent: 5088869 (1992-02-01), Greenslade

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