Stepped thread and cutoff thread joint exhibiting excellent fati

Details Stepped thread and cutoff thread joint exhibiting excellent fati Stepped thread and cutoff thread joint exhibiting excellent fati

1989-11-02

1990-07-24

Reese, Randolph A.

Pipe joints or couplings

Particular interface

Tapered

285390, 285333, F16L 2500

Patent

active

049430955

ABSTRACT:
A thread joint to be subjected to the fluctuating load having a thread to be subjected to the tensile load from which a thread crest contact surface is cut off from the threads thereof in the direction of the tensile load, and the contact height of the same is lowered with respect to the other portion. Therefore, the maximum bending moment per unit area generated at the root of the threads is uniformed and the peak bending moment per unit area is reduced.

REFERENCES:
patent: 2204754 (1940-06-01), Frame
patent: 2772102 (1956-11-01), Webb
patent: 3050318 (1962-08-01), Van Der Wissel
patent: 3467413 (1969-09-01), Madrelle
patent: 4113290 (1978-09-01), Miida
patent: 4189975 (1980-02-01), Nisida et al.
patent: 4346920 (1982-08-01), Dailey
patent: 4521042 (1985-06-01), Blackburn et al.
patent: 4549754 (1985-10-01), Saunders et al.
patent: 4688832 (1987-08-01), Ortloff et al.
patent: 4730857 (1988-03-01), Schwind

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