Screw

Details Screw Screw

1985-05-03

1989-04-11

Lindsey, Rodney M.

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

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

Thread or shank structure

411412, 411416, F16B 2500, F16B 3504

Patent

active

048200980

ABSTRACT:
The screw is provided with a three-lobed thread crest, followed by a threaded portion with a three-lobed thread geometry, which passes into a threaded portion with a circular thread geometry. In all three threaded portions the flank angle of the thread is 60.degree. and the flank angle of the thread crests extending beyond the nominal diameter of the screw is 30.degree..

REFERENCES:
patent: 3426820 (1969-02-01), Phipard
patent: 3843984 (1974-10-01), Bagheri et al.
patent: 3878759 (1975-04-01), Carlson
patent: 3918345 (1975-11-01), Phipard
patent: 3935785 (1976-02-01), Lathom
patent: 3939512 (1976-02-01), Thurston et al.
patent: 4040328 (1977-08-01), Muenchinger
patent: 4315340 (1982-02-01), Veldman
Product Engineering, World of Self-Locking Screws Grows, Apr. 1979, p. 57, FIG. 9 & column 2.

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