Drill bit for a down-the-hole drill

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/36 (2006.01)

Patent

CA 2750853

The invention concerns a drill bit, intended to be used with a down-the-hole drill and comprising a drill head (2) with a front surface provided with drill pins (3) and a shaft (4), whereby the shaft is narrower than the drill head and intended to be inserted in a manner that allows axial sliding into the end of a drill chuck that is a component of a down-the- hole drill and which shaft has a rear end part (6) that is somewhat thickened with a plane striking surface (7) against which a hammer piston (8) that is a component of the down- the-hole hammer drill is arranged to impact, that the drill head when viewed along its axial direction has a cylinder-shaped forward part (20) provided with cuttings channels (22), a rear cylinder-shaped part (21) that is located for the reception of drill cuttings at the same level or somewhat below the bottom (25) of the cuttings channels, whereby the diameter (D1) of the forward part is greater than the diameter (D2) of the rear part. In a drill bit that has high performance and a long useful life, and that is furthermore well-suited to be used for directed drilling, the cylinder-shaped forward part (20) of the drill head (2) has an axial length (L3) from the main plane of the front surface to a shoulder plane (26) located between the drill head (2) and the shaft (4) that is greater than the axial length (L4) of the cylinder-shaped rear part (21) of the drill head.

L'invention concerne un trépan destiné à être utilisé avec un marteau de fond de trou, comprenant une tête de forage (2) constituée d'une surface avant dotée de tiges de forage (3) et d'un arbre (4), l'arbre étant plus étroit que la tête de forage et destiné à être introduit dans l'extrémité d'un mandrin de forage qui est un composant de marteau de fond de trou, d'une manière autorisant son coulissement axial. L'arbre comprend une partie d'extrémité arrière (6) qui est légèrement élargie dotée d'une surface de frappe plane (7) contre laquelle un piston de marteau (8), qui est un composant de marteau perforateur de fond de trou, vient heurter. La tête de forage, lorsqu'elle est observée dans sa direction axiale comprend une partie avant cylindrique (20) pourvue de canaux de déblais de forage (22), une partie arrière cylindrique (21) qui est destinée à recevoir les déblais de forage, placée au même niveau que les canaux de déblais ou légèrement en-dessous (25) de ces derniers, le diamètre (D1) de la partie avant étant supérieur au diamètre (D2) de la partie arrière (D2). Dans un trépan selon l'invention, qui présente une performance élevée et une durée de vie prolongée, et qui convient en outre pour un forage dirigé, la partie avant cylindrique (20) de la tête de forage (2) a une longueur axiale (L3), du plan principal de la surface avant à un plan d'épaulement (26) situé entre la tête de forage (2) et l'arbre (4), qui est supérieure à la longueur axiale (L4) de la partie arrière cylindrique (21) de la tête de forage.

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