Double cone coupling nipple of a steel tubing and method of maki

Details Double cone coupling nipple of a steel tubing and method of maki Double cone coupling nipple of a steel tubing and method of maki

1998-01-20

1999-12-07

Arola, Dave W.

Pipe joints or couplings

Particular interface

Tapered

285356, 285916, 285917, 2853345, 28514819, 29890053, 7237014, F16L 19028

Patent

active

059970502

ABSTRACT:
A thin-walled steel tubing is to be constructed with a double cone coupling nipple for the tight screwed connection with a counterpart by way of a cap screw in a crack-resistant manner. The steel tubing is thin-walled and constructed of high-strength steel. With respect to the remaining tubing area, the nipple has at least partially at least approximately a double wall thickness. The steel tubing is not soft annealed at any point including the whole area of the nipple. With respect to the material, the contact surfaces of the nipple are harder than the surfaces of the countercontact. The cone angle of the sealing surface of the nipple measures over 100.degree..

REFERENCES:
patent: 1354419 (1920-09-01), Reppetto
patent: 2150524 (1939-03-01), Starr
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patent: 3101204 (1963-08-01), Pratley
patent: 3449937 (1969-06-01), Dimmig
patent: 4134430 (1979-01-01), Mukasa
patent: 4665876 (1987-05-01), Hashimoto
patent: 4679828 (1987-07-01), Bernardot
patent: 4881763 (1989-11-01), Guido et al.
patent: 5529349 (1996-06-01), Gibbs et al.
Document Search Report, Date Apr. 29, 1998, Country Europe.

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