发明名称 TUBULAR THREADED JOINT WITH TRAPEZOID THREADS HAVING CONVEX BULGED THREAD SURFACE.
摘要 <p>The invention concerns a tubular threaded joint comprising two male and female threaded elements one screwed into the other with a specific torque wherein at least one thread surface under contact pressure (125) has prior to being screwed a continuous convex bulged shape over its bending radius length ranging between 2 and 60 mm and is in point-to-point contact with the corresponding surface (26) of the conjugate element. Such a threaded joint exhibits enhanced screwing and unscrewing strength. In one embodiment, the convex bulged surface (125) is a male or female thread flank and one of the male or female threads comprises a groove (31) emerging at the thread crest (29) to make, as the case may be, either the convex bulged flank (125) or the corresponding flank flexible. Such a geometry enables to accommodate contact variations between the flanks.</p>
申请公布号 MXPA03006962(A) 申请公布日期 2004.05.05
申请号 MX2003PA06962 申请日期 2002.02.04
申请人 SUMITOMO METAL INDUSTRIES LTD. 发明人 THIERRY NOEL
分类号 F16L15/02;F16B7/18;F16L15/00;F16L15/06;(IPC1-7):F16L15/06 主分类号 F16L15/02
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