Method of making self tapping thread forming screw

Details Method of making self tapping thread forming screw Method of making self tapping thread forming screw

1980-11-04

1983-01-18

Combs, Ervin M.

10 27R, B21K 156, B21H 302

Patent

active

043685528

ABSTRACT:
A method of making a screw for forming internal threads in a hole in a work formed from a blank having a shank portion and a frusto-conical shaft portion. Three flat portions extending parallel with the axis of the blank are formed on the shank. A length of the end portion of the frusto-conical shaft portion is left as right circular. A delta formed region is formed on the head end of each flat portion, and has a peripherally arcular convex surface and tapers to the flat portion. By thread rolling all but the shaft end portion, spoon-like recesses are formed at the crest of the threads passing on the flat portion to form inducing male threads. The depth of the spoon-like recesses sequentially decrease on the delta formed region to produce transient torque increasing characteristics.

REFERENCES:
patent: 3180126 (1965-04-01), Carlson
patent: 3451080 (1969-06-01), McIntyre et al.
patent: 3469491 (1969-09-01), Munsey
patent: 3597781 (1971-08-01), Eibes
patent: 3633455 (1972-01-01), Larson
patent: 3878759 (1975-04-01), Carlson

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