Blank for a thread forming screw

Details Blank for a thread forming screw Blank for a thread forming screw

1984-01-11

1986-02-25

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

428577, B21H 304

Patent

active

045728755

ABSTRACT:
A method for manufacturing thread-forming screws wherein the tapered leading end of the screws can include thread portions or sections having sharp crests but wherein the thread-forming screws can be made using conventional flat thread rolling dies. Also provided is a screw blank having a tapered leading end particularly shaped or formed such that when the threads are rolled on the screw blank using conventional flat thread rolling dies, the tapered leading end of the screw will include thread sections having sharp crests.

REFERENCES:
patent: 2278411 (1942-04-01), Braendel
patent: 2871751 (1959-02-01), Lemke
patent: 3083609 (1963-04-01), Lovisek
patent: 3207024 (1965-09-01), Sommer
patent: 3370501 (1968-02-01), Ansingh
patent: 4042342 (1977-08-01), Muenchinger
patent: 4069730 (1978-01-01), Gutshall
patent: 4104446 (1978-08-01), Johnson
patent: 4259889 (1981-04-01), Capvano
patent: 4486135 (1984-12-01), Kazino

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