Rock drill bit

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 51/02 (2006.01) E21B 10/44 (2006.01)

Patent

CA 2736188

A rock drill bit comprising a shank (1) fitted with a clamping end (2) and a drilling tip (3) at the end away from the clamping end, the drilling tip (3) comprising at least three, preferably exactly three blades (4, 5, 6) which are alar in topview, said blades each comprising at their top side a lip (7, 8, 9) constituted by a leading chipping face (7a, 8a, 9a) and a trailing f lank(76, 86, 96), the lips substantially converging onto each other within a central zone (10) centered on the drill bit axis (11), wherein, in the central zone (10), a single lip (7) long lip runs through the bit axis (11) and comprises a commensurate overshoot segment (12) extending beyond the bit axis (11).

L'invention porte sur un trépan à roche comprenant une tige (1) équipée d'une extrémité de serrage (2) et d'une pointe de forage (3) à l'extrémité opposée de l'extrémité de serrage, la pointe de forage (3) comprenant au moins trois, de préférence exactement trois, lames (4, 5, 6) qui sont alaires en vue de dessus, lesdites lames étant pourvues chacune, sur leur côté supérieur, dune lèvre (7, 8, 9) constituée par une face écornée d'attaque (7a, 8a, 9a) et un flanc de fuite (76, 86, 96), les lèvres convergeant sensiblement l'une vers l'autre à l'intérieur d'une zone centrale (10) centrée sur l'axe de trépan (11). Dans la zone centrale (10), une unique lèvre (7) lèvre longue traverse l'axe de trépan (11) et comporte un segment de dépassement proportionné (12) s'étendant au-delà de l'axe de trépan (11).

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