Percussive device for a rock drilling machine, method for...

B - Operations – Transporting – 25 – D

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Details

B25D 9/26 (2006.01) B25D 9/16 (2006.01) E21B 1/24 (2006.01) E21B 1/26 (2006.01)

Patent

CA 2606788

A percussion device (1) with a reciprocating percussion piston (3) , includes a first chamber (5) that can be pressurized for forward driving of the percussion piston (3) and a second chamber (8) that can be periodically pressurized for back- driving of the percussion piston (3) . The percussion device includes at least one driving piston (7) arranged for actuating the back-driving of the percussion piston (3) wherein a portion of said driving piston (7) is arranged to enter into the second chamber (8) for pressure actuating on a driving surface of the driving piston by pressure medium being present in this chamber in the direction of back-driving, wherein the driving piston (7) includes means for back-driving co- operation with the percussion piston (3) , and wherein the driving piston (7) is free for axial movement with respect to the percussion piston (3), opposite the direction of back- driving. The invention also concerns a method and a rock drilling machine .

Dispositif à percussion (1) doté d~un piston à percussion alternative (3), comprenant une première chambre (5) qui peut être pressurisée pour l~avance du piston à percussion (3) et une seconde chambre (8) qui peut être pressurisée périodiquement pour le recul du piston à percussion (3). Le dispositif à percussion comprend au moins un piston d~entraînement (7) arrangé pour actionner le recul du piston à percussion (3), une partie dudit piston d~entraînement (7) étant arrangée pour pénétrer dans la seconde chambre (8) pour la commande de la pression sur une surface d~entraînement du piston d~entraînement par la présence d~une moyenne pression dans cette chambre dans le sens du rappel en arrière, le piston d~entraînement (7) comprenant des moyens de coopération en recul avec le piston à percussion (3) et le piston d~entraînement (7) étant exempt de mouvement axial par rapport au piston à percussion (3), dans la direction opposée au recul. L~invention a également pour objet une méthode et une perforatrice de roches.

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