Rock drill

E - Fixed Constructions – 21 – B

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E21B 10/00 (2006.01) E21B 10/44 (2006.01) E21B 10/56 (2006.01) E21B 10/58 (2006.01)

Patent

CA 2040052

A rock drill has an axially extending shank (1) with a drill head (2) on one end. The drill head (2) has an end face (3) with a cutting blade (4) and cutting pins (5) extending outwardly from the and face in the drilling direction. The cutting blade (4) extends, diametrically across the end face and projects radially outwardly from the drill head (2) said axially outwardly from the end face (3). The cutting pins (5) are arranged on a diameter of the drill head which forms an acute angle relative to the cutting blade (4). Due to the acute angle between the cutting pins and the diametrically arranged cutting blade, removal grooves extending axially from the end face can be enlarged.

La présente invention vise une perforatrice de roches munie d'une queue en saillie sur le plan axial (1) et d'une tête porte-forêt (2) à une extrémité. La tête porte-forêt (2) présente une surface terminale (3) dotée d'une lame de raclage (4) et de broches coupantes (5) se prolongeant au-delà de la surface terminale, vers la zone d'attaque. La lame de raclage (4) se prolonge diamétralement hors de la surface terminale et excède la tête porte-forêt (2) sur le plan radial, dans l'axe externe de la surface terminale (3). Les broches coupantes (5) sont disposées au périmètre de la tête porte-forêt de manière à former un angle aigu par rapport à la lame de raclage (4). Comme les broches coupantes et la lame de raclage diamétralement opposées forment un angle aigu, il est possible d'élargir les rainures de dépose faisant saillie sur le plan axial par rapport à la surface terminale.

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