Percussive down-the-hole hammer for rock drilling, a top sub...

Details Percussive down-the-hole hammer for rock drilling, a top sub... Percussive down-the-hole hammer for rock drilling, a top sub...

E - Fixed Constructions

21

B

E21B 4/14 (2006.01)

Patent

CA 2420980

A down-the-hole percussive hammer includes a cylindrical casing adapted to carry a drill bit, and a piston mounted in the casing for reciprocal movement to repeatedly strike the drill bit. A top sub is mounted at a rear portion of the casing, the top sub including a front face facing the piston. A feed tube is mounted to the top sub and extends forwardly along a center axis of the casing and defines an air-conducting passage. The piston includes an axial through-hole which slidably receives the feed tube. The front face and the feed tube together define a recess opening toward the piston. A removable volume-changer is insertable into the recess to vary a volume of a space in which the piston slides, and thus control a pressure at which the piston operates.

L'invention concerne un marteau perforateur fond-de-trou comprenant un boîtier cylindrique conçu pour porter un trépan, et un piston monté dans le boîtier dont le mouvement de va-et-vient permet de frapper le trépan de manière répétitive. Un raccord double supérieur est monté sur une partie arrière du boîtier, une face avant de ce raccord faisant face au piston. Un tube d'alimentation est monté sur le raccord double supérieur, s'étendant vers l'avant selon un axe central du boîtier, définissant un passage d'air. Le piston comprend un trou traversant axial recevant latéralement le tube d'alimentation. La face avant et le tube d'alimentation définissent ensemble un orifice en creux vers le piston. Un dispositif amovible de changement de volume peut être inséré dans cet orifice en creux afin de faire varier un volume d'espace dans lequel se meut le piston, permettant ainsi une régulation de la pression à laquelle le piston fonctionne.

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