SCREW DRIVER (VERSIONS) Russian patent published in 1997 - IPC

Abstract RU 2072909 C1

FIELD: mechanical engineering. SUBSTANCE: screw driver has rod with working end formed as projection 3 with parallel working surfaces 4 and 5 mated with screw slot surface and having length equal to 1.5-2 of slot depth. Projection 3 of screw driver is inserted into slot of screw and rod is rotated to provide screwing in or unscrewing. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 7 dwg

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RU 2 072 909 C1

Authors

Nefed'Ev Valentin Ivanovich

Dates

1997-02-10—Published

1993-05-11—Filed