Hammer bit

Details Hammer bit Hammer bit

E - Fixed Constructions

21

B

E21B 10/26 (2006.01)

Patent

CA 2724677

A hammer bit includes a bit body coupled to a hammer drill, a housing bit disposed to the bit body, at least one wing bit coupled to the housing bit to move up and down slantly, and having a rotating radius that is more increased than an outer surface of the bit body when moving up and is more decreased than the outer surface of the bit body when moving down, and at least one spacer installed to move up and down together with the wing bit and filling up an upper space of the wing bit when the wing bit moves down.

La présente invention concerne un trépan de marteau perforateur qui comprend un corps de trépan couplé au marteau perforateur, au moins un trépan à ailettes couplé au trépan extérieur afin de monter et descendre de manière inclinée et présentant un rayon de rotation qui est plus grand qu'une surface extérieure du corps de trépan lorsqu'il monte et qui est plus petit que la surface extérieure du corps de trépan lorsqu'il descend, et au moins un espaceur installé pour monter et descendre en même temps que le trépan à ailettes, ledit espaceur occupant tout l'espace supérieur du trépan à ailettes lorsque ce dernier descend.

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