Self-thread forming threaded fasteners and blanks for making sam

Details Self-thread forming threaded fasteners and blanks for making sam Self-thread forming threaded fasteners and blanks for making sam

1974-01-14

1976-09-07

Britts, Ramon S.

10 24, 29183, F16B 2500

Patent

active

039787605

ABSTRACT:
A self-thread forming threaded fastener has a straight thread on a shank of circular cross section and a tapered thread on the work-entering end. The tapered portion of the thread is of lobular root, pitch and crest surface cross sections and which lobular configuration is continued, but to a diminishing extent, on the first few threads on the shank immediately adjacent to the tapered section. The fastener is formed by rolling between thread-rolling dies a blank having a cylindrical shank of circular cross section and an end section of arcuate lobular cross section including a tapered portion. At least the lobular and tapered portions of the blank are intermittently deflected first in one direction and then in the opposite direction by the dies. Due to such deflections of the end of the blank, a lobular tapered thread is produced on the tapered portion of the blank.

REFERENCES:
patent: 2352982 (1944-07-01), Tomalis
patent: 3180126 (1965-04-01), Carlson
patent: 3426642 (1969-02-01), Phipand
patent: 3451080 (1969-06-01), McIntyre et al.
patent: 3724315 (1973-04-01), Sygnator

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