Threaded connection for enhanced fatigue resistance

Pipe joints or couplings – Particular interface – Tapered

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Threaded connection for enhanced fatigue resistance does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Threaded connection for enhanced fatigue resistance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Threaded connection for enhanced fatigue resistance will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-842446

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.