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Title:
TAPER THREADED JOINT
Document Type and Number:
WIPO Patent Application WO/2001/094831
Kind Code:
A1
Abstract:
A taper threaded joint, wherein a clearance (L¿1?[mm]) between the thread top face (1a) of a tapered male thread (1) and the thread bottom face (2b) of a tapered female thread (2) or a clearance (L¿2?[mm]) between the thread bottom face (1c) of the tapered male thread (1) and the thread top face (2c) of the tapered female thread (2), whichever comes smaller (L[mm]), is so related as $g(d)$m(F)L• (tan$g(a)+tan$g(b)) to a load surface angle ($g(a)[°]) and an inserting surface angle ($g(b)[°]), and an axial clearance ($g(d)[mm]) produced in the lateral direction of the thread as a difference between the top width of the tapered male thread (1) and the bottom width of the tapered female thread (2) threaded with each other, an initially set thread interference amount (H) being H$m(g)2L if an interference amount is required for the thread part, whereby a thread having sufficient tensile and compressive resistance forces can be manufactured easily with a correct working allowance and, particularly in a threaded joint for well pipe having a metal seal part, a reliability can be increased because the sealability thereof is excellent.

Inventors:
MAEDA JUN (JP)
NAGASAKU SHIGEO (JP)
SUMITANI KATSUTOSHI (JP)
Application Number:
PCT/JP2001/004798
Publication Date:
December 13, 2001
Filing Date:
June 07, 2001
Export Citation:
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Assignee:
SUMITOMO METAL IND (JP)
MAEDA JUN (JP)
NAGASAKU SHIGEO (JP)
SUMITANI KATSUTOSHI (JP)
International Classes:
E21B17/042; F16L15/06; (IPC1-7): F16L15/06
Foreign References:
JPH11294650A1999-10-29
JPH06281061A1994-10-07
JPH10148281A1998-06-02
Other References:
See also references of EP 1296088A4
Attorney, Agent or Firm:
Hirose, Shoichi (Nihonbashi-Honcho 4-chome Chuo-ku Tokyo, JP)
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