Screw fastener

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

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F16B 2500

Patent

active

045361177

ABSTRACT:
A self-tapping screw fastener for driving into a workpiece. The self-tapping screw fastener includes a generally cylindrical shank having an entering end and a trailing end, driving means integrally joined with the trailing end and an external helical thread, integral with the shank and adapted for forming a complimentary thread in the workpiece. The helical thread has a double angle profile which is defined by a base portion having a relatively large included angle and a crest portion having a relatively small included angle.

REFERENCES:
patent: 410698 (1889-09-01), Rogers
patent: 1229560 (1917-06-01), Whiteman
patent: 1451484 (1923-04-01), Woodward
patent: 3069960 (1962-12-01), Baubles
patent: 3104161 (1963-09-01), Carlson
patent: 3207023 (1965-09-01), Knohl
patent: 3249142 (1966-05-01), Phipard
patent: 3426820 (1969-02-01), Phipard
patent: 3748949 (1973-07-01), Dreger
patent: 3794092 (1974-02-01), Carlson
Frank Yeaple, "World of Self-Locking Screws Grows", Product Engineering, Apr. 1979, p. 57, FIG. 9.
A brochure from N. L. Southern Screw, N. L. Industries, Inc.

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