Drill for earth-moving, mining has feed tubes that can be assembled, advanced, drill tool reversibly connected to last tube with external size less than/equal to tube internal diameter or can be changed so tool can be moved out of tube

摘要

The drilling device consists of feed tubes (1) can be assembled and advanced and a drill tool (3) on the last tube that is reversibly connected to the tube and whose external size is less than/equal to the internal diameter of the tube or can be changed so that the drilling tool is movable up out of the tube.