Methods of attaching a shank to a body of an earth-boring...

Details Methods of attaching a shank to a body of an earth-boring... Methods of attaching a shank to a body of an earth-boring...

E - Fixed Constructions

21

B

E21B 10/42 (2006.01)

Patent

CA 2673112

Earth-boring rotary drill bits including a bit body (44) attached to a shank (48). In some embodiments, the bit body and the shank may have abutting surfaces (54, 56) concentric to an interface axis (A1) offset relative to a longitudinal axis (L42) of the drill bit. In additional embodiments, the bit body and the shank may have generally frustoconical abutting surfaces (98, 100). Methods for attaching a shank and a bit body of an earth-boring rotary drill bit include abutting a surface of a shank against a surface of a bit body, and causing the abutting surfaces to be concentric to an axis that is offset or shifted relative to a longitudinal axis of the drill bit.

L'invention concerne des trépans rotatifs de forage souterrain incluant un corps de trépan (44) fixé à une tige (48). Dans certains modes de réalisation, le corps de trépan et la tige peuvent présenter des surfaces de butée (54, 56) concentriques à un axe d'interface (A1) décalé par rapport à l'axe longitudinal (L42) du trépan. Dans des modes de réalisation supplémentaires, le corps de trépan et la tige peuvent avoir des surfaces de butée généralement tronconiques (98, 100). Les procédés pour fixer une tige et un corps de trépan sur un trépan rotatif de forage souterrain comportent la mise en butée d'une surface de tige contre une surface du corps de trépan et amènent les surfaces de butée à être concentriques à un axe décalé ou déplacé par rapport à l'axe longitudinal du trépan.

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