Tubular connection with cylindrical and tapered stepped threads

Pipe joints or couplings – Particular interface – Tapered

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285351, 285369, 285417, F16L 2500

Patent

active

045374295

ABSTRACT:
A tubular joint or connector of box and pin members is disclosed having first threads provided on a taper with respect to the axis of the joint and second threads which are cylindrical and axially separated from the first threads. The first and second threads are radially separated by a step region. Two metal-to-metal seals of complementary engaging sealing surfaces are provided, one adjacent the end of the pin member, the other axially disposed between the two threads. Reverse angle torque shoulders at the end of the pin member and the interior termination of the box member and hooked threads further characterize the joint and box and pin members.

REFERENCES:
patent: 1927656 (1933-09-01), Eaton et al.
patent: 1932427 (1933-10-01), Stone
patent: 1973848 (1934-09-01), Duffy
patent: 2211179 (1940-08-01), Stone
patent: 3224799 (1965-12-01), Blose
patent: 3489437 (1970-01-01), Duret
patent: 3989284 (1976-11-01), Blose
patent: 4009893 (1977-03-01), Shatton et al.
patent: 4192533 (1980-03-01), Blose
patent: 4244607 (1981-01-01), Blose
patent: 4253687 (1981-03-01), Maples
patent: 4373754 (1983-02-01), Bollfrass et al.
ASME Publication, 75-Pet-34, Jun. 19, 1975.

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