Screw having non-strip drive recess and driver bit for use...

Details Screw having non-strip drive recess and driver bit for use... Screw having non-strip drive recess and driver bit for use...

2006-07-18

2006-07-18

Wilson, Lee D. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S436000, C081S461000

Reexamination Certificate

active

07077038

ABSTRACT:
The present invention provides a screw, comprising a screw head having a drive recess and a screw shank having threads and being integrally formed with the screw head, wherein the drive recess includes a plurality of engaging grooves equiangularly radiating from an axis of the screw in plan view, a bottom face of each engaging groove having a steep slope, which is near to the screw shank, and a gentle slope, which is far from the screw shank, for enlarging the engaging area of the engaging grooves.

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patent: 2003-013924 (2003-01-01), None

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