Thread-forming screw

Details Thread-forming screw Thread-forming screw

2005-09-23

2009-02-03

Estremsky, Gary (Department: 3673)

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

C411S387500

Reexamination Certificate

active

07484920

ABSTRACT:
A thread-forming screw (11; 21; 31; 51), has a stem (12) with at least one thread (14; 24; 34; 54) arranged, at least regionwise, over its circumference, and a plurality of cutting elements (16; 26; 36; 56) arranged in a respective plurality of recesses (15; 25; 35; 55) formed in the at least one thread (14; 24; 34; 54), with the cutting elements (16; 26; 36; 56) having a hardness greater than a hardness of the at least one thread (14; 24; 34; 54) and formed as weld beads received in the recesses (15; 25; 35; 55).

REFERENCES:
patent: 3426642 (1969-02-01), Phipard, Jr.
patent: 3680646 (1972-08-01), Hughes et al.
patent: 3890685 (1975-06-01), Runte et al.
patent: 4350464 (1982-09-01), Brothers
patent: 4385669 (1983-05-01), Knutsen
patent: 4842467 (1989-06-01), Armstrong
patent: 6478520 (2002-11-01), Sala
patent: 6599072 (2003-07-01), Gerhard
patent: 7160073 (2007-01-01), Mizuno et al.
patent: WO 2004/074697 (2004-09-01), None

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