High fatigue screw threads

Details High fatigue screw threads High fatigue screw threads

1975-09-19

1977-08-09

Frazier, Roy D.

F16B 3302

Patent

active

040403270

ABSTRACT:
A symmetric screw thread system including external threads each profiled to have a flank angle of (70 .+-. 2).degree. and a flat root located at (0.27 .+-. 0.02)H from an intersecting point of two lines extended from opposing flanks of two adjacent threads and connected to said opposing flanks through arcs of a radius (0.15 .+-. 0.02)p where H is the depth and p is the pitch of the threads. Alternatively, the system may include external threads configured to have a flank angle of (106 .+-. 5).degree. and connected by a root having a radius of (0.30 .+-. 0.01)p.

REFERENCES:
patent: 658086 (1900-09-01), Higbee
patent: 2742074 (1956-04-01), Rosan
patent: 3175850 (1965-03-01), Steczynski
patent: 3433117 (1969-03-01), Gowen et al.
World Screw-Thread Forms I-VIII from American Machinist/Metal Working Manufacturing, 6/12/61, p. 129, 6/26/61 pp. 93, 95, 7/10/61, p. 111, 7/24/61, pp. 105, 107, 8/21/61, pp. 119, 121.

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