Patent ID: 6484820
Filing Date: 2002-11-26
Classification: E21B

Abstract:
Process for sinking drill holes, in particular exploration and extraction drill holes, comprising:providing an apparatus having a drill pipe, which at its end facing a floor to be mined includes guide point fixed in the longitudinal direction of the drill pipe and a drill head with at least one cutting element, wherein the drill head can be moved in the longitudinal direction of the drill pipe between a top position, in which the guide point projects beyond the at least one cutting element, and a bottom position in which the at least one cutting element is positioned at the same height as the end of the guide point or projects beyond the same in the operating direction; moving the apparatus when the drill head is in the top position in the direction of the drill hole to be produced until the guide point, by cooperating with the floor, fixes the end of the drill pipe in position; and moving the drill head into the bottom position in order to produce the drill hole.