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

摘要

drilling drill bits for drilling are adapted to be struck attached to the end of the drill and the elements of the drilling assembly and a bit head (21) having a diameter larger than the diameter of the drill element. Bit head is provided with a plurality of generally frusto-gauge button extends along a distribution of the ring for engagement with the material to be crushed is a truncated cone with a conical phase 25 at the distal end when viewed in the intended drilling direction (23) which substantially it is defined by a circumferential ring (24). The central flush channel 29 extends through the bit head and having at least one flushing hole (32 to 35) which is open at the distal end to the distal end portion to guide the flushing medium. Wherein the at least one flushing hole (32-35) at least one peripheral opening in the front end of the flushing holes (32 to 34) is substantially open at the circumferential ring (24). At least two peripheral flushing holes (32-34) are open at the substantially cylindrical ring (24). ;