Pipe joints or couplings – Particular interface – Tapered
Patent
1989-11-07
1992-12-08
Arola, Dave W.
Pipe joints or couplings
Particular interface
Tapered
403343, F16L 2500
Patent
active
051691833
ABSTRACT:
A threaded joint for coupling two drill rod elements includes a first drill rod element having at least one end thereof a male tapered helical threading with a cone opening angle greater than 1.degree. and less than 3.degree.. The threading has a constant pitch determining an angle of inclination of the decreasing helix as greater than 1.degree. and less than 3.degree. at the beginning of the helical threading. A second drill rod element has corresponding female tapered helical threading. Each tapered helical threading has primary and secondary shoulders on opposite ends thereof and a stand-off between the primary shoulders when the male and female tapered helical threading are manually fitted together. The male tapered helical threading has discharge grooves in an unthreaded zone for deflection of lines of force. The primary and secondary shoulders have a truncated cone shape, and the ratio between the cone opening angle and the angle of inclination of the helix at the beginning of the tapered helical threading is less than 2.
REFERENCES:
patent: 2532632 (1950-12-01), MacArthur
patent: 3572777 (1971-03-01), Blose et al.
patent: 4154466 (1979-05-01), Simmons
patent: 4614120 (1986-09-01), Fradin et al.
patent: 4687368 (1987-08-01), Eklof et al.
Shryne et al., "New Tool Joint Improves High Angle Drilling", six pages.
"American Petroleum Institute Publication", pp. 26-27.
Arola Dave W.
Diamant Boart Stratabit S.A.
LandOfFree
Threaded joint for drill rod elements 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 joint for drill rod elements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Threaded joint for drill rod elements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-956813