Earth drilling apparatus

摘要

Disclosed is apparatus for drilling or boring a hole in the earth, as for forming blast holes. The apparatus disclosed is of the self-propelled mobile type having at one end a driver cab and at the other end drilling apparatus including a drill storage and handling rack adapted to store drill rods and as required to bring them into alignment with the drilling axis to form a drill string and to remove the drill rods from the drill string. The apparatus also supplies air to and through the drill string to blow out debris from the drilled hole. The apparatus includes a unique and efficient type of mechanism for rotating the drill rack to bring drill rods to or remove them from the drill string. Also disclosed is a unique type of drill rod particularly adaptable for use in the apparatus.