Thread-forming screw with step taper

Details Thread-forming screw with step taper Thread-forming screw with step taper

1978-05-05

1980-03-25

Bonck, Rodney H.

85 41, F16B 2500

Patent

active

041944305

ABSTRACT:
A thread-forming screw has a point or lead thread portion having a relatively steep entry angle with respect to the screw axis. Adjacent to the point thread is a tapered thread portion of about two to three pitches in axial length. This tapered thread has a shallow entry angle defined by the taper of the maximum diameter of the thread toward the point. This shallow entry angle may be approximately 5.degree. to 8.degree. or equal to about three times the helix angle of the tapered thread. This configuration of the tapered thread results in a balanced action of thread formation and axial in-feed of the screw, resulting in a lower end pressure to initiate the thread-forming in a workpiece. A roll-threading die is contoured to provide ridges and valleys to effect the tapered thread portion.

REFERENCES:
patent: 1809758 (1931-06-01), Rosenberg
patent: 3050755 (1962-08-01), Welles
patent: 3246556 (1966-04-01), Phipard
patent: 3269006 (1966-08-01), Welles
patent: 3364807 (1968-01-01), Holton
patent: 3726180 (1973-04-01), Rosan
patent: 3752030 (1973-08-01), Steurer
patent: 3918345 (1975-11-01), Phipard
patent: 4040328 (1977-08-01), Muenchinger

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