One way screwdriver

Details One way screwdriver One way screwdriver

1983-01-03

1984-02-07

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81441, B25B 1500

Patent

active

044295995

ABSTRACT:
A tamper proof screw head screwdriver blade utilizes a handle attached to an elongated cylindrical shaft. The distal end of the shaft is contoured so as to have a pair of diametrically opposed wedge-shaped portions removed defining two pairs of wall-like surfaces, wherein each of the wall-like surfaces extend along a portion of the distal end of the shaft. The pair of corners located at the free end of the shaft and one of each of the pairs of wall-like surfaces, are broken away, defining two surfaces, each skew with the plane defined by the free end of the shaft and each extending in opposite directions forming an acute angle with the longitudinal axis of the shaft. In use, the blade is inserted in the head of a screw having a transverse notch therein separating a pair of curved surfaces extending outwardly from the floor of the transverse notch. The free ends of the screwdriver blade engage portions of each of the curved protrusion like surfaces in the head of the screw, thus permitting it to be removed by counterclockwise rotation of the screwdriver.

REFERENCES:
patent: 1055031 (1913-03-01), Groos
patent: 1761156 (1930-06-01), Rosan
patent: 1782981 (1930-11-01), Anderson
patent: 2678578 (1954-05-01), Bonanno
patent: 2804894 (1957-09-01), Rosenburg
patent: 3253625 (1966-05-01), Oestereicher
patent: 3601170 (1971-08-01), Sciascia
patent: 4026338 (1977-05-01), Goebel
patent: 4270418 (1981-06-01), Shephard

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