Connection of drill tubes

Details Connection of drill tubes Connection of drill tubes

1982-09-20

1985-07-23

Arola, Dave W.

Pipe joints or couplings

Deformed

Outwardly expanded

285390, 285397, 29523, F16L 1314

Patent

active

045305277

ABSTRACT:
The invention provides a method of joining two rigid tubes such as are used in drill stems wherein a nipple internal to the tubes is threaded and screws into at least one of the tubes, the nipple provided with a zone of reduced internal diameter which registers with a cavity in the internal bore of the tube and the zone of reduced internal diameter expanded outwards into contact with the tube to occupy the registering cavity in the tube and form a positive lock against tensile forces.

REFERENCES:
patent: 214881 (1879-04-01), Cain
patent: 806156 (1905-12-01), Marshall
patent: 1281977 (1918-10-01), Kelley
patent: 1682635 (1928-08-01), Smith
patent: 2346051 (1944-04-01), Seamark
patent: 2429076 (1947-10-01), Sery
patent: 2793059 (1927-05-01), Woodling
patent: 4128264 (1978-12-01), Oldford
patent: 4411456 (1983-10-01), Martin

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