Screwdriver with concave blade

Details Screwdriver with concave blade Screwdriver with concave blade

1986-08-20

1988-01-05

Olszewski, Robert P.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 1500

Patent

active

047167971

ABSTRACT:
A screwdriver (10) disclosed includes a handle (12), an elongated shaft (14) having a central axis (A) and also having a transverse thickness D and a blade (22) unitary with the shaft extending thereof away from the handle along the central axis. The blade (22) includes a main portion (24) and a tip (26) connected to the main portion and has oppositely facing continuously curved concave surfaces (28) that taper toward each other away from the thickness D of the shaft (14) to the tip.

REFERENCES:
patent: 432928 (1890-07-01), Bartlett
patent: 1479506 (1924-01-01), Kelleman
patent: 2782823 (1957-02-01), Williams
patent: 4452289 (1984-06-01), Smith

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