Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1989-04-19
1992-07-07
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
411411, 285334, F16B 3504, F16L 2500
Patent
active
051277840
ABSTRACT:
A fatigue resistant buttress thread. The thread has a load flank angle of approximately 30.degree. plus or minus approximately 5.degree. and a relief flank angle of approximately 46.degree. plus or minus approximately 5.degree.. The thread engaged depth is approximately 0.232 times the pitch of the thread, and the thread has a root radius approximately 0.175 times the pitch. The thread is particularly well adapted for use in cover retainers for holding valves and rupture discs in plunger pumps. Finite element analysis and actual tests indicate a greatly improved fatigue resistance compared to previously known buttress threads and other thread forms.
REFERENCES:
patent: 3433117 (1969-03-01), Gowen, Jr. et al.
patent: 4258768 (1981-03-01), Pamer et al.
patent: 4295751 (1981-10-01), Holmberg
patent: 4346920 (1982-08-01), Dailey
patent: 4549754 (1985-10-01), Saunders et al.
patent: 4771801 (1988-09-01), Crump et al.
patent: 4799844 (1989-01-01), Chuang
Standard Handbook for Mechanical Engineers, Seventh Edition, Theodore Baumeister, Editor, McGraw-Hill Book Company, published 1967.
Duzan James R.
Halliburton Company
Kennedy Neal R.
Wilson Neill R.
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