Indexing percussive drilling bit

E - Fixed Constructions – 21 – B

Patent

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E21B 4/16 (2006.01) E21B 10/36 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2257210

A chuk (34) and drill bit (30) combination for insertion into a front end of a percussive, down the hole drill (2, 8) forming a part of a cluster drill assembly (1), for selectively engaging and disengaging the chuck and drill bit during drilling operations includes the bit and chuck each having splines (66, 72) and grooves (68, 74) adapted to overlap and engage each other in a first stop position and further adapted to disengage from each other in a second stop position, whereby the bit is restrained from rotational movement but capable of axial movement in the first stop position and capable of both axial and rotational movement in the second stop position, to provide automatic indexing of the bit so as to position the bit's gage drilling buttons (24) in a preferred position outboard of the drill centerline (48), to maintain maximum borehole diameter.

L'invention porte sur un outil combiné mandrin (34)/outil de forage (30) se montant à l'extrémité frontale d'un marteau fond-de-trou (2, 8), faisant partie d'un faisceau d'outils de forage (1) et permettant de saisir ou dessaisir sélectivement l'outil combiné pendant les opérations de forage. L'outil et le mandrin présentent tous deux des cannelures (66, 72) et des rainures (68, 74) se recouvrant et s'engageant les unes dans les autres dans une première position d'arrêt, et se dégageant les unes des autres dans une deuxième position d'arrêt. La première position interdit la rotation de l'outil mais permet ses déplacements longitudinaux et la deuxième position permet à la fois les mouvements longitudinaux et les mouvements de rotation, ce qui assure l'indexage automatique de l'outil, et le positionnement des pastilles de mise au calibre (24) dans une position optimale, en porte à faux par rapport à l'axe de forage (48), ce qui confère au forage un diamètre maximal.

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