1978-02-17
1979-06-19
Spruill, Robert Louis
Bridges
145 50B, B25B 1500
Patent
active
041583752
ABSTRACT:
A screwdriver comprising a shank, a conventional screw driving head projecting from one end of the shank and in alignment therewith and characterized by an auxiliary screw driving head including a pair of auxiliary screw driving bits projecting from opposite sides respectively relative to the shank and angularly arranged relative to each other whereby a screw with a limited overhead space may be screwed by alternative engagement of the auxiliary screw driving bits with the head of the screw and progressive complementary rotation of the auxiliary bits. The latter are angularly arranged at different angles relative to the shank each as seen in front view. Thus for slotted head screw the auxiliary ribs are angularly offset one relative to the other by an angle of preferably 90.degree. between them as seen in front view to complementarily produce a rotation of 180.degree.. For an allen screw or phillips screw the auxiliary bits are similarly offset by preferably 45.degree. to complementarily produce a rotation of 90.degree..
REFERENCES:
patent: D180643 (1957-07-01), Fitch
patent: 366439 (1887-07-01), Troy
patent: 1239131 (1917-09-01), Shay
patent: 1728141 (1929-09-01), Tomelick
patent: 1780785 (1930-11-01), Jansson et al.
patent: 2933963 (1960-04-01), Blasdell
Spruill Robert Louis
Zatarga J. T.
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