Thread-forming screw

Details Thread-forming screw Thread-forming screw

2005-06-28

2005-06-28

Gall, Lloyd A. (Department: 3676)

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

C411S387400, C411S412000, C411S424000

Reexamination Certificate

active

06910841

ABSTRACT:
A thread-forming screw includes a head and a shank, the shank having a thread and a thread-forming zone at the end opposite to the head, the thread-forming zone also having a thread portion. The shank at the end opposite to the head has a spherical portion with a maximum diameter in a plane perpendicular to the axis of the shank which corresponds approximately to the mean diameter of the thread of the shank.

REFERENCES:
patent: 2856617 (1958-10-01), Widmann
patent: 3094894 (1963-06-01), Bromberg
patent: 4261402 (1981-04-01), Stanaitis
patent: 4637767 (1987-01-01), Yaotani et al.
patent: 5209622 (1993-05-01), Kazino et al.
patent: 5234301 (1993-08-01), Grossberndt et al.
patent: 6135892 (2000-10-01), Donovan
patent: 6142186 (2000-11-01), Donovan
patent: 6155761 (2000-12-01), Donovan
patent: 6158938 (2000-12-01), Savoji
patent: 6328515 (2001-12-01), Donovan
patent: 39 22 684 A 1 (1991-01-01), None
patent: 1-182613 (1989-01-01), None
patent: WO 98/13606 (1998-04-01), None
Patent Abstract of Japanese Publication No. 03272309 A, Published Dec. 4, 1991.
DIN 7500, Oct. 1978, pp. 1-6.

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