Pipe joints or couplings – Particular interface – Tapered
Reexamination Certificate
2011-03-08
2011-03-08
Bochna, David E (Department: 3679)
Pipe joints or couplings
Particular interface
Tapered
Reexamination Certificate
active
07900975
ABSTRACT:
A threaded joint for steel pipes constituted by a pin having male threads and a box having female threads is improved with respect to ease of insertion of the pin and galling resistance of the threaded portions. The stabbing flanks of the threads in a complete thread portion of one of the pin and a box has a two-step stabbing shape having a chamfer. The two-step stabbing shape has a stabbing flank angle α of 5-45° and a chamfer angle β of 20-60°. The ratio h/H of the chamfer height h to the thread height H of the pin is 0.25-0.50, or the ratio of the cross-sectional area of the chamfered portion to the overall cross-sectional area of the stabbing flank is made at least a value corresponding to a chamfer height ratio h/H of 0.25 and at most a value corresponding to a chamfer height ratio of 0.50.
REFERENCES:
patent: 4398756 (1983-08-01), Duret et al.
patent: 4549754 (1985-10-01), Saunders et al.
patent: 5782503 (1998-07-01), Noel et al.
patent: 6322110 (2001-11-01), Banker et al.
patent: 6848724 (2005-02-01), Kessler
patent: 7331614 (2008-02-01), Noel et al.
patent: 7416374 (2008-08-01), Breihan et al.
patent: 60-157583 (1985-08-01), None
patent: 2001-165363 (2001-06-01), None
patent: 2002-61780 (2002-02-01), None
patent: 92/15815 (1992-09-01), None
patent: 2004/109173 (2004-12-01), None
Hamamoto Takahiro
Nakamura Keiichi
Sugino Masaaki
Yamaguchi Suguru
Bochna David E
Clark & Brody
Sumitomo Metal Industries Ltd.
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