Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Patent
1991-10-02
1994-02-22
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
81185, 81460, 269266, B25B 2310
Patent
active
052877787
ABSTRACT:
The subject apparatus is an improved screw driver adapted to have an expanding head to adapt to different screw head types and sizes, such screw driver device apparatus comprising a hollow handle member affixed concentrically to a hollow shaft, with the hollow shaft member holding a plurality of movable rod members that are adapted to move axially and longitudinally, within a limited distance in such hollow shaft member towards the head of the screw driver to move the ends thereof into position on the head of the screw.
REFERENCES:
patent: 1896949 (1933-02-01), Greiner
patent: 3127798 (1964-04-01), Gol
patent: 3674070 (1972-07-01), Mahoney
patent: 3858467 (1975-01-01), Pasbrig
patent: 3895828 (1975-07-01), Bitantis
patent: 4887498 (1989-12-01), Zayat
Royer George R.
Smith James G.
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