Saw tooth screw

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure

Reexamination Certificate

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Details

C411S387800

Reexamination Certificate

active

07862280

ABSTRACT:
A saw tooth screw provides a screw thread divided into a first and a second thread sections. A plurality of slots, inclined with respect to a shank axial line, are disposed on each thread of the first thread section for dividing the thread into a plurality of thread segments, wherein each of the thread segment has a first inclined surface and a second inclined surface on two ends thereof; the first inclined surface is parallel to the second inclined surface. The thread of the second thread section is formed of a saw-tooth-shape by having recesses extending from a shank to an outer edge of the thread for debris of object to exit through the slots, thereby reducing the screwing torsion and increasing the screwing rotation speed.

REFERENCES:
patent: 2867786 (1959-01-01), Doetsch et al.
patent: 3083609 (1963-04-01), Lovisek
patent: 5044853 (1991-09-01), Dicke
patent: 5110245 (1992-05-01), Hiroyuki
patent: 2005/0186048 (2005-08-01), Dicke

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