GUIDING DEVICE FOR ROCK DRILLING MACHINE

摘要

A guiding device for a rock-drilling machine (1), the rock-drilling machine (1) including a drill portion (4) with a drill bit (10) and a drill-portion centre axis (26), and a string portion (6) with a string-portion centre axis (28), the drill-portion (4) and the string-portion (6) being inter-connected by means of a guiding joint (8), and the drill portion (4) being provided with, between the drill bit (10) and the guiding joint (8), a guiding support (16) which is arranged to bear against the borehole wall (56) of a borehole (2).