Patent ID: 9739095
Date: 2017-08-22
CPC Classifications: E21B

Claim:
1. A drill bit for percussive rock drilling tools, comprising: a drill bit head having a longitudinal axis and a front surface including a face surface defining a forward-most end of the drill bit head; at least one hole located in the drill bit head and a button located in the at least one hole; at least one face surface hole disposed in the face surface of the drill bit head, a face button being located in the face surface hole; at least one recess disposed in the face surface, the at least one recess being larger than the at least one hole, the at least one hole being disposed in the at least one recess so that an open end of the at least one hole is disposed below the face surface, the drill bit head including a gauge surrounding the face surface, wherein the at least one recess and the at least one hole are partially disposed in the gauge and partially disposed in the face surface; and at least one gauge hole disposed in the gauge and a gauge button located in the at least one gauge hole, a center of the at least one gauge hole being radially further from the longitudinal axis than a center of the at least one recess and a center of the at least one hole disposed in the recess, a forward-most point of the button being disposed behind a forward-most point of the face button in a direction of the longitudinal axis of the drill bit and even with or forward of a forward-most point of the gauge button.