Bit assembly

Details Bit assembly Bit assembly

E - Fixed Constructions

21

B

E21B 10/64 (2006.01) E21B 6/00 (2006.01) E21B 10/26 (2006.01) E21B 10/40 (2006.01) E21B 10/62 (2006.01)

Patent

CA 2511725

A bit assembly for a drilling apparatus working by impact and rotation or merely by rotation, and comprising a pilot bit (1) drilling the hole centre and in connection with the pilot bit a ring bit (2) is arranged to drill the outer circle of the hole and, further, between pilot bit and ring bit surfaces are arranged to transmit impacts and/or rotary motion from the pilot bit to the ring bit, and the bit assembly also including an arrangement for pulling protectino tube into the hole on drilling. In the bit assembly between ring bit (2) and pilot bit (1) at least an arrangement transmitting rotation is jointly fitted in the ring bit shirt portion (5) by forming the rear edge of the shirt portion seen in the drilling direction to comprise surfaces with different directions, which with one of their portion (4) can transmit rotary motion force to the ring bit (2) and with their adjacent part (3) force to pull said ring bit off the hole.

L'invention concerne un ensemble trépan pour un appareil perforateur fonctionnant par impact et rotation ou simplement par rotation et comprenant un trépan pilote (1) perforant le centre d'un orifice et, en connexion avec le trépan pilote, une couronne de trépan (2) disposée de manière à perforer le cercle externe de l'orifice et, par ailleurs, des surfaces venant entre le trépan pilote et la couronne de trépan disposées afin de transmettre les impacts et/ou le mouvement rotatif provenant du trépan pilote vers la couronne de trépan. L'ensemble trépan comporte également un agencement permettant de pousser le tube de protection dans l'orifice au moment de la perforation. Dans l'ensemble trépan, un agencement venant entre la couronne de trépan (2) et le trépan pilote (1) et transmettant la rotation est fixé dans la partie gaine (5) de la couronne de trépan par la formation du bord arrière de la partie gaine que l'on voit dans le sens de perforation de manière à comprendre les surfaces à directions différentes qui peuvent, à l'aide d'une de leur partie (4), transmettre la force de mouvement rotatif à la couronne de trépan (2) et à l'aide de leur partie adjacente (3) la force permettant de tirer ladite couronne de trépan hors de l'orifice.

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