F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 35/00 (2006.01) B25B 15/00 (2006.01) B25B 23/00 (2006.01) F16B 23/00 (2006.01)
Patent
CA 2054866
ABSTRACT OF THE DISCLOSURE A recessed screw having in its head a recess for engaging with a driver bit, with the recess being defined with curved sticking walls and radial or corner grooves. Each stick- ing wall is a portion of a conical surface slanted inwardly towards a bottom of the recess. Each corner groove extends outwards from the adjacent sticking walls in radial direc- tion. A pair of vertical side walls lying parallel with the recessed screw's axis define each corner groove. The driver bit has protrusions tightly fittable in the recess, which recess may be a superimposition of two square holes disposed symmetrically with a phase shift of 45° around the axis so as to provide eight corner grooves. Each sticking wall may be formed at a place where the side walls intersect one another. The driver bit may comprise a shank and a bit portion which extends from the shank and formed with eight V-shaped grooves extending axially of the bit so that eight blades are defined each between the two V-- shaped grooves. A bottom of each V-shaped groove or a top of each blade may be a curved wall to closely contact with the sticking walls in the recess.
Kirby Eades Gale Baker
Shinjo Katsumi
Yugenkaisha Shinjo Seisakusho
LandOfFree
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