Screw

Details Screw Screw

2011-03-29

2011-03-29

Estremsky, Gary (Department: 3677)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

C411S387300, C411S411000

Reexamination Certificate

active

07914245

ABSTRACT:
The present invention pertains to a screw with a first thread section comprised of a trailing and a leading thread segments respectively spiraled on a shank and a tip section. Distinctly, the leading thread segment defines a plane surface thereon to convergently engage with an adjacently thread peak on the trailing thread segment and further constructs a thread width greater than that of the trailing thread segment while aligning the two thread segments with a correspondent profile thread height. Such configuration of the plane surface accompanies its larger thread width to enlarge a drilling channel and accordingly renders an easy entry of the trailing thread segment into an object with less friction and higher screwing speed. Additionally, the debris is partially removed through the void between the enlarged channel and the trailing thread segment to avoid cracking the object, decrease drilling torque, and enhance the fastening capability.

REFERENCES:
patent: 4150702 (1979-04-01), Holmes
patent: 5569009 (1996-10-01), Suzuki
patent: 5735653 (1998-04-01), Schiefer et al.
patent: 6030162 (2000-02-01), Huebner
patent: 6116832 (2000-09-01), Wolf et al.
patent: 6984235 (2006-01-01), Huebner

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