Patent ID: 9062504
Filing Date: 2015-06-23
Classification: E21B

Abstract:
1. A rock drill bit for percussive drilling comprising: a bit head 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, wherein said bit head has, at a front end relative to an intended drilling direction, a generally frusto-conical shape defined by a substantially circumferential ring, wherein said bit head includes: wherein one of the at least three flushing holes is a face flushing hole that opens at a front surface of the bit head and two of the at least three flushing holes are peripheral flushing holes that open in said substantially circumferential ring, and wherein said bit head has a circumferential surface and further includes a plurality of recesses in the circumferential surface through which flushing media is conducted rearwardly, externally of the rock drill bit.