E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/56 (2006.01)
Patent
CA 2576681
The present invention relates to a rock drill bit (1) for percussive drilling. The drill bit comprises a bit body (2), a head portion (3) defining a longitudinal center axis (CL), the head portion comprising a front face (8) having an outer portion (12), wherein the outer portion (12) is raised relative to the front face (8) and comprising peripheral buttons (6) and at least one fluid channel (7) extending through the head portion and communicating with the front face (8) for conducting a flushing medium thereto. The outer portion comprises a number of circumferentially spaced, raised steel portions (12), each said portion (12) comprising maximum two peripheral buttons (6). The peripheral buttons (6) are mounted in the head portion (3) radially outside of an imaginary circle (C) intersecting at least two front buttons (4) and at least two flushing channels (7) arranged generally annularly around a center axis (CL) of the drill bit (1; 1~).
L'invention concerne un fleuret pour perforatrice (1) en forage de roche par percussion, qui comprend un corps de fleuret (2), une tête (3) qui définit un axe central longitudinal (CL), la tête comprenant une face frontale (8) à partie externe (12) surélevée par rapport à ladite face (8) et équipée de boutons périphériques (6) et d'au moins un canal fluidique (7) qui s'étend à travers la tête et communique avec la face frontale (8), permettant d'y acheminer un fluide de circulation. La partie externe comprend un certain nombre d'éléments en acier surélevés espacés sur la circonférence (12), chacun (12) comportant au maximum deux boutons périphériques (6) montés sur la tête (3) en configuration radiale à l'extérieur d'un cercle imaginaire (C) qui recoupe au moins deux boutons frontaux (4) et au moins deux canaux de circulation de fluide (7) disposés de façon généralement annulaire autour d'un axe central (CL) du fleuret (1; 1').
Bjork Fredrik
Hadin Per-Ola
Gowling Lafleur Henderson Llp
Sandvik Intellectual Property Ab
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