Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate
2007-07-31
2007-07-31
Shakeri, Hadi (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
C081S448000
Reexamination Certificate
active
10512000
ABSTRACT:
A screw holding screwdriver bit capable of effectively preventing a come-out from occurring by improving the structure of the blade portions thereof, capable of being manufactured in a simple structure at a low cost, and capable of remarkably increasing a working efficiency by allowing an appropriate and rapid screw tightening operation at all times, and the combination thereof with screws, the driver bit including a plurality of blade portions (12) having generally vertical end edge portions (13) formed at the tip ends (12a) thereof, wherein one of the blade portions (12) is cut out in the axial direction of the bit, a guide passage (16) of a specified length is provided in a shaft (11) portion continued generally on the extension of the cutout portion (15) of the blade portion, and an elastic piece (18) allowed to elastically abut on a bit engagement groove in a screw head and having a screw holding function by the interaction thereof with the blade portion fitted in the bit engagement groove is inserted in the guide passage.
REFERENCES:
patent: 518472 (1894-04-01), Snyder
patent: 3224479 (1965-12-01), Osborn et al.
patent: 3286749 (1966-11-01), Leamed
patent: 3517714 (1970-06-01), Desbarats
patent: 4007768 (1977-02-01), Matsushima
patent: 4060114 (1977-11-01), Matsushima
patent: 4800788 (1989-01-01), Goldstein
patent: S46-31719 (1971-09-01), None
patent: S47-596 (1972-01-01), None
patent: S47-36000 (1972-11-01), None
patent: S48-9440 (1973-03-01), None
patent: S49-22519 (1974-06-01), None
patent: S51-148795 (1976-11-01), None
patent: S54-117698 (1979-08-01), None
patent: S60-100162 (1985-07-01), None
patent: H7-328946 (1995-12-01), None
patent: H8-71939 (1996-03-01), None
patent: H8-145024 (1996-06-01), None
Koda & Androlia
Shakeri Hadi
LandOfFree
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