Percussion pin drill for drilling in rock and/or minerals

摘要

The invention relates to a percussion pin drill for drilling in rock and/or minerals, having a bit (10a) which has, at least at the end face, blind bores (14) in which essentially cylindrical pins (11) of carbide and/or mechanically resistant materials are fastened by press or shrink fitting. In order to reduce stresses in the bottom area of the blind bore (14), it is proposed that the pins (11) have grooves (15) at the circumference. The grooves (15) are preferably arranged as longitudinal grooves in the bottom third of the pin facing the bottom (14a) of the blind bore (14). <IMAGE>