Rock drilling tool, drill bit and a method of transferring...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/36 (2006.01) E21B 10/56 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2216974

The present invention relates to a rock drilling tool for percussive drilling comprising a drill bit (11) and a drill tube (12) co-operating by means of shoulder abutment in a threaded connection. The connection comprises at least one male thread (17) and a female thread (18). The male thread (17) is provided on a shank (19) being an integral part of the drill bit (11). The drill bit is provided with a shoulder (20) at the inner end of the shank (19), said shoulder having an abutment surface (21) facing towards the free end of the shank (19). The female thread (18) is provided in the drill tube (12) and the free end of the drill tube is provided with an impact surface (23). The threads (17, 18) are cylindrical. The present invention is characterized by combining shoulder abutment with a short head and straight energy transfer at a rock drilling tool. The invention further relates to a drill bit and a method of transferring percussive energy from a rock drilling tool to a bore hole.

L'invention porte sur un outil de forage de roches par percussion, comprenant un trépan (11) et un tube de forage (12) agissant de concert par le biais d'une butée à épaulement dans un raccord fileté. Le raccord comprend au moins un filetage mâle (17) et un filetage femelle (18). Le filetage mâle est placé sur une tige (19) qui fait partie intégrante du trépan (11). Celui-ci est pourvu d'un épaulement (20) sur l'extrémité intérieure de la tige (19), ledit épaulement étant muni d'une surface de butée (21) tournée vers l'extrémité libre de la tige (19). Le filetage femelle (18) se trouve dans le tube de forage (12) dont l'extrémité libre est munie d'une surface d'impact (23). Les filetages (17, 18) sont cylindriques. La présente invention se caractérise par une combinaison de butée à épaulement avec une tête courte et de transfert d'énergie direct vers un outil de forage de roches. Elle porte, de surcroît, sur un trépan et sur une technique de transfert d'énergie de percussion de l'outil à un trou alésé.

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