Down-the-hole drilling machine

Details Down-the-hole drilling machine Down-the-hole drilling machine

E - Fixed Constructions

21

B

E21B 4/14 (2006.01)

Patent

CA 2238785

Down-the-hole drilling machine comprising a housing (1) with a hammer piston (5)movable to-and-fro and intended to exert a drill bit (3) to impacts. The hammer piston is formed with two piston heads (6,7) and a waist (9) between them. An intermediate wall (10) is arranged around the waist (9) so that two chambers (11,12) are formed on either side of the intermediate wall. The chamber (11) between the intermediate wall and the forward piston head (6) is continuously pressurized via a first channel (13) in the intermediate wall. The chamber (12) is via a second channel (15) in the intermediate wall connected to a space (16) in front of the hammer piston (5). Through this double drive areas are obtained during the working stroke of the hammer piston.

Marteau perforateur fond-de-trou comprenant un boîtier (1) comptant un piston-marteau (5) mobile dans les deux sens et destiné à appliquer une force sur l'outil de forage (3) lors des impacts. Le piston-marteau est constitué de deux têtes de piston (6, 7) et d'une partie amincie (9) entre elles. Une paroi intermédiaire (10) se trouve tout le tour de la partie amincie (9) de sorte que deux chambres (11, 12) sont formées de chaque côté de la paroi intermédiaire. La chambre (11) entre la paroi intermédiaire et la tête du piston avant (6) est continuellement sous pression par le biais d'un premier passage (13) dans la paroi intermédiaire. La chambre (12) est par un deuxième passage (15) dans la paroi intermédiaire reliée à un espace (16) devant le piston-marteau (5). Grâce à ce dispositif, des surfaces d'entraînement doubles sont obtenues pendant la course de travail du piston-marteau.

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