Stock material or miscellaneous articles – All metal or with adjacent metals – Intermediate article
Patent
1976-06-15
1977-08-16
Steiner, Arthur J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Intermediate article
85 47, B21H 300, F16B 3500
Patent
active
040423425
ABSTRACT:
A blank is formed for providing a self-thread forming threaded fastener having a straight thread on a shank of circular cross section and tapered thread of 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), Tomahis
patent: 3180126 (1965-04-01), Carlson
patent: 3451080 (1969-06-01), McIntyre et al.
patent: 3587157 (1971-06-01), Mundt et al.
patent: 3592727 (1971-07-01), Weaver et al.
patent: 3724315 (1973-04-01), Sygnator
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