A method for the preparation of the drilling devices, in particular for the pipe screen art and drilling apparatus

摘要

A drilling device 1 for the preparation of a tube screen 60 operates independently of the rock conditions always uniform and secures the production of bores 35 is always the same cross section, when the one-piece or multipart drilling element 3 about the distance to the drilling axis 23 arranged base point axis 26 is designed to pivot. The drilling member 3 with their decomp panels elements 15 and the base point axis 26 are designed and arranged so that the working angle 25 between the line of action 24 of the drilling element 3 and of the drilling axis 23 is greater than the angle 30, the the resulting rock release force 27 to the drilling axis 23 has.