Percussive down-the-hole rock drilling hammer and piston...

E - Fixed Constructions – 21 – B

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E21B 4/14 (2006.01) E21B 1/38 (2006.01)

Patent

CA 2395837

A down-the-hole percussive drill comprises a casing, a drill bit mounted at a lower end of the casing, a hollow feed tube fixed within the casing and extending along a center axis thereof, and a piston mounted for axial reciprocation within the casing for transmitting impacts to the drill bit. The upper portion forms a downwardly facing surface at the junction between the upper and lower portions. Passages for conducting lubricant-containing pressurized air are formed in the piston. At least one of those passages constitutes a vertical recess formed in the outer periphery of the piston. The piston includes a radially outwardly projecting rib disposed between upper and lower ends of the recess. Air is blocked from traveling past the rib until the rib becomes located opposite an annular groove formed in an inner surface of the casing.

L'invention concerne un marteau perforateur fond-de-trou comprenant un boîtier, un trépan monté sur l'extrémité inférieure du boîtier, un tube d'alimentation creux fixé dans le boîtier et s'étendant le long d'un axe central de ce dernier, et un piston monté de façon à effectuer un mouvement de va-et-vient axial, situé dans le boîtier et destiné à transmettre des impacts au trépan. La partie supérieure forme une surface orientée vers le bas à la jonction entre les parties supérieures et inférieures. Des passages destinés au passage d'air sous pression contenant un lubrifiant sont formés dans le piston. Au moins un de ces passages constitue un évidement vertical formé dans le pourtour externe du piston. Ce piston comprend une nervure se projetant vers l'extérieur de façon radiale, située entre les extrémités supérieures et inférieures de l'évidement. L'air ne peut pas circuler au-delà de cette nervure tant que la nervure ne se trouve pas en face d'une rainure annulaire formée dans la surface interne du boîtier.

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