Air actuated down-the-hole hammer and drill bit and foot...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01) E21B 21/00 (2006.01)

Patent

CA 2665235

The present invention relates to a percussive down-the-hole hammer, a drill bit and a foot valve. The drill bit includes a body having a front drilling face, a central passage extending from a rear end of the body in a direction towards the drilling face to conduct flushing medium to the drilling face. The rear end includes an impact surface surrounding the passage. The central passage is adapted to receive a foot valve to transfer pressurized air through the drill bit. The foot valve and the central passage include insertion stop means and major extraction stop means for the foot valve. The insertion stop means are provided at a distance from the major extraction stop means.

La présente invention concerne un marteau fond de trou à percussion, un trépan et un clapet de pied. Le trépan comprend un corps qui possède une face de forage avant, un passage central qui s'étend à partir d'une extrémité arrière du corps dans une direction vers la face de forage pour conduire un milieu de rinçage vers la face de forage. L'extrémité arrière comprend une surface d'impact qui entoure le passage. Le passage central est conçu pour recevoir un clapet de pied pour transférer de l'air sous pression à travers le trépan. Le clapet de pied et le passage central comprennent des moyens d'arrêt d'introduction et des moyens majeurs d'arrêt d'extraction pour le clapet de pied. Les moyens d'arrêt d'introduction sont prévus à une distance des moyens majeurs d'arrêt d'extraction.

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