Pipe joints or couplings – Particular interface – Tapered
Patent
1997-05-02
1999-08-03
Nicholson, Eric K.
Pipe joints or couplings
Particular interface
Tapered
285333, 285355, F16L 1500
Patent
active
059315113
ABSTRACT:
A threaded connection for improving fatigue resistance to cyclic loading is disclosed. The threaded connection basically comprises a pair of interlocking members having corresponding radially inner and radially outer spiral threads thereon, each spiral thread including a spiral compression flank and a spiral tension flank wherein at least one of the spiral compression flanks and spiral tension flanks on the inner spiral threads are in mating planar engagement with a corresponding spiral compression flank and spiral tension flank on the outer spiral thread. Axial spacing between the tension flanks and the compression flanks on the radially inner and radially outer spiral threads further define a stress reducing spiral root surface on at least one of the radially inner and radially outer threads and a corresponding crest surface on the other radially inner and radially outer spiral threads. Resistance to cyclic loading on the threaded connection is improved because of the stress reducing spiral root surface which includes a substantially linear profile spaced axially between the compression flank of one thread and a tension flank of an adjoining thread. The stress reducing spiral root surface intersects the compression flank and tension flank along corresponding first and second axially spaced rounded surfaces each having a radius of at least 0.015 inches. Loading is therefore, distributed evenly over the threads rather than being concentrated at what normally would be a sharp juncture formed in the root of the thread.
REFERENCES:
patent: 2893759 (1959-07-01), Blose
patent: 3508771 (1970-04-01), Duret
patent: 4113290 (1978-09-01), Miida
patent: 4494777 (1985-01-01), Duret
patent: 4508375 (1985-04-01), Patterson et al.
patent: 4549754 (1985-10-01), Saunders et al.
patent: 4708513 (1987-11-01), Roche et al.
patent: 4928999 (1990-05-01), Landriault et al.
patent: 5056611 (1991-10-01), Yousef et al.
patent: 5092635 (1992-03-01), Delange et al.
patent: 5419595 (1995-05-01), Yamamoto
Buster Jerry L.
DeLange Richard
Evans Ed
Grant Prideco, Inc.
Nicholson Eric K.
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