Elliptical thread design

Details Elliptical thread design Elliptical thread design

1988-01-11

1989-01-24

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

411423, 403307, 285334, F16B 3504

Patent

active

047998440

ABSTRACT:
A screw structure (10) is provided for male and female threads (14) having at least one thread (14) extending helically along a cylindrical support member (12) in spaced thread turns. A root portion (22) extends between adjacent thread (14) turns and has a curvature defined by a portion of an ellipse (24) for providing improved stress reduction during periods of severe loading.

REFERENCES:
patent: 1884973 (1932-10-01), Hoke
patent: 4040756 (1977-08-01), Donegan
patent: 4084829 (1978-04-01), Falchle et al.
patent: 4295751 (1981-10-01), Holmberg
patent: 4549754 (1985-10-01), Saunders et al.

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