Drill crown for rotary percussive drill rod has crown inner part surrounded concentrically by crown outer part, with crown inner part axially displaceably and non-rotatively connected with rotary percussive drill rod

摘要

The rotary percussive drill rod (4) has a drill crown (1), the inner part (2) of which is concentrically surrounded by a crown outer part (3). The crown inner part is axially displaceably and non-rotatively connected with the rotary percussive drill rod. The rotary and striker energy transmitted from the drill rod to the drill crown is converted into a drill advance to the drill hole sole. On the face side (14,20) of the drill crown facing the drill hole sole are arranged cutting and striker components (19) together with flushing channels (12,13,15,18).