Screwdriver blade with curved tip

Details Screwdriver blade with curved tip Screwdriver blade with curved tip

1989-11-02

1991-03-26

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81438, B25B 1348

Patent

active

050019481

ABSTRACT:
A stronger screwdriver blade is disclosed which is particularly effective for driving round-headed screws. The screwdriver blade has 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 has a predetermined length and thickness, with side edges extending back toward the shank from ends of the end edge. The tip has substantially parallel, planar sides extending back toward the shank from the end edge to inner edges which, at the side edges, are spaced a distance from the end edge which is approximately equal to the thickness of the end edge. The inner edges are curved with the planar sides being from one and one-half to three and one-half times as wide at central portions as at end portions. From the inner edges, opposite side surfaces of the tapered end extend abruptly outwardly in a direction toward the shank so that the blade tip is thicker at high stress areas thereof.

REFERENCES:
patent: 4878406 (1989-11-01), Simpson et al.

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