Thread coupling

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/042 (2006.01)

Patent

CA 2192204

Thread coupling for percussive drilling including at least one male thread (10), arranged on a spigot (11), and one female thread (17), arranged within a sleeve. The threads are cylindrical and include an external stop surface (20) at a free end of the sleeve, and a contact surface (14) on the spigot. Further, they include an internal stop surface (21) in the sleeve, and an end surface (16) on the free end of the spigot. Initially, there is a play (.delta.) between the end surface (16) of the spigot and the internal stop surface (21) of the sleeve, this initial play being eliminated after wearing-in of the thread coupling. By increasing the pitch angle (.alpha.) of the threads (19, 17), a less tightening coupling is achieved, that due to the shoulder-bottom stop, still has an acceptable length of life.

Raccord fileté pour sondage à percussion comprenant au moins un filetage mâle (10) disposé sur un bout mâle (11) et un filetage femelle (17) situé à l'intérieur d'un manchon. Les filets sont cylindriques et comportent une surface extérieure de butée (20) à une extrémité libre du manchon, ainsi qu'une surface de contact (14) située sur le bout mâle. De plus, ils comportent une surface intérieure de butée (21) située dans le manchon et une surface terminale (16) à l'extrémité libre du bout mâle. Un jeu (.delta.) initial existe entre la surface terminale (16) du bout mâle et la surface intérieure de butée (21) du manchon, ce jeu étant éliminé après l'usure du raccord fileté. L'agrandissement de l'angle du pas (.alpha.) des filets (19, 17) permet de limiter le serrage du raccord, sous l'effet de la butée inférieure d'épaulement, tout en lui conservant une durée de vie acceptable.

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