A ROCK DRILL BIT, A DRILLING ASSEMBLY AND A METHOD FOR PERCUSSIVE ROCK DRILLING

摘要

A rock drill bit for percussive drilling comprises a bit head (21) configured to be attached at an end of a drill element of a drilling assembly and having a diameter larger than that of a said drill element. The bit head has at a front end (23) a generally frusto-conical shape defined by a substantially circumferential ring (24) provided with a plurality of gauge buttons (25) distributed along the extension of the ring for engaging material to be crushed. A flush channel extends through the bit head and has at least one flushing hole (32) opening in said substantially circumferential ring.