Higher fastening screw

Details Higher fastening screw Higher fastening screw

2007-10-26

2010-02-02

Estremsky, Gary (Department: 3677)

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

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

Thread or shank structure

C411S417000

Reexamination Certificate

active

07654785

ABSTRACT:
The present invention pertains to a high-speed fastening screw comprising a plurality of concavities on the threads connected in sequence in a single helix. Further, the concavities separately located adjacent to the screw head and to the drilling portion are disposed at relative positions for aligning with an imaginary line, hence efficiently cutting and severing the object fibers to enhance a screwing efficiency.

REFERENCES:
patent: 1235626 (1917-08-01), Woodward
patent: 1294268 (1919-02-01), Holmes
patent: 2302675 (1942-11-01), Cherry
patent: 2393990 (1946-02-01), Kamborian
patent: 4697969 (1987-10-01), Sparkes
patent: 7063491 (2006-06-01), French
patent: 2004/0253076 (2004-12-01), French

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