DRILL BIT HAVING A SUNKEN BUTTON AND ROCK DRILLING TOOL FOR USE WITH SUCH A DRILL BIT.

摘要

A drill bit (21) for percussive rock drilling tools is provided and includes a drill bit head (23) having a front surface (25) having a face surface (27) defining a forward-most end of the drill bit head (23), at least one hole (29) in the drill bit head (23) for receiving a button (31). The drill bit (21) comprises at least one recess (33) in the face surface (27). The recess (33) is larger than the hole (29). The hole (29) is disposed in the recess (33) so that an open end (35) of the hole (29) is disposed below the face surface (27). The drill bit head (23) comprises a gauge (43) surrounding the face surface (27), and the recess (33) is partially disposed in the gauge (43).