E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/042 (2006.01)
Patent
CA 2324214
The present invention relates to a thread joint, a male portion, a female portion and a method for manufacturing a product for percussive drilling. The threaded connection comprises at least one substantially cylindrical external thread and a substantially cylindrical internal thread. The external thread is provided on a spigot (13) of a drill string component. The thread comprises thread ends (30) provided in connection with an associated full profile thread (14A). Said thread comprises thread flanks (30A, 30B, 14B, 14C). At least one of the substantially cylindrical threads comprises at least one thread end (30) the shape of which differs from the shape of the full profile thread (14A). Each thread flank (30A, 30B) of the thread end (30) has a profile, which differs from the profile of the associated flanks (14B, 14C) of the full profile thread (14A).
Cette invention se rapporte à un raccord fileté, à une pièce mâle, à une pièce femelle et à un procédé de fabrication d'un produit pour forage par percussion. Ce raccord fileté comprend au moins un filetage externe essentiellement cylindrique et un filetage interne essentiellement cylindrique. Le filetage externe est ménagé sur un goujon (13) d'un constituant du train de tiges de forage. Ce filetage comporte des extrémités (30) coopérant avec un filetage à profil droit associé (14A). Ce filetage comporte également des flancs (30A, 30B, 14B, 14C). Au moins l'un des filetages essentiellement cylindriques comporte au moins une extrémité (30) dont la forme diffère de la forme du filetage à profil droit (14A). Chaque flanc (30A, 30B) de l'extrémité (30) du filetage présente un profil qui diffère du profil des flancs associés (14B, 14C) du filetage à profil droit (14A).
Liljebrand Per-Olof
Olsson Urban
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
LandOfFree
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