Screwdriver blade

Details Screwdriver blade Screwdriver blade

1988-09-28

1989-11-07

Hartman, Judy

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 1348

Patent

active

048784060

ABSTRACT:
A screwdriver blade is provided which has greater resistance to failure. The screwdriver blade includes an elongate shank with a tapered end extending from the shank and terminating in a tip. The tip has a straight edge perpendicular to the shank and is of a predetermined thickness, with parallel, planar sides extending back from the edge a distance which is approximately equal to the thickness of the edge. Opposite surfaces of the blade end then extend abruptly outwardly in a direction toward the shank, each at an angle of approximately fifteen degrees to an axis of the blade. An analysis has indicated that the greatest stress in a screwdriver blade occurs at a predetermined distance back from the straight edge of the blade. The new blade is thicker and stronger at the areas where the greatest stress occurs.

REFERENCES:
patent: 2678578 (1954-05-01), Bonanno
Dodds, "Justice for the Lowly Screwdriver", American Machinist, Aug. 29, 1946, p. 126.

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