F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 15/06 (2006.01)
Patent
CA 2437528
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.
Le joint fileté tubulaire comprend deux éléments filetés mâle et femelle vissés l'un dans l'autre sous un couple donné dans lesquels au moins une face de filet sous pression de contact (125) possède avant vissage une forme bombée convexe continue sur sa largeur de rayon de courbure compris entre 2 et 60 mm et est en contact ponctuel avec la face correspondante (26) de l'élément conjugué. Un tel joint fileté présente une résistance accrue au dévissage ou au survissage. Dans un mode de réalisation, la face bombée convexe (125) est un flanc de filet mâle ou femelle et un des filets mâle ou femelle comprend une gorge (31) débouchant en sommet de filet (29) pour rendre flexible selon le cas le flanc bombé convexe (125) ou le flanc correspondant. Une telle géométrie permet d'accommoder les variations de contact entre flancs.
Noel Thierry
Roussie Gabriel
Varenne Emmanuel
Robic
Sumitomo Metal Industries Ltd.
Vallourec Mannesmann Oil & Gas France
LandOfFree
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