Patent ID: 8562269
Filing Date: 2013-10-22
Classification: E21B

Abstract:
1. A drilling apparatus, comprising: a drill rig which defines a drilling rod axis; a rod magazine storing a plurality of rod sections; and a transfer device comprising first and second members movable in relation to one another in a direction of the drilling rod axis, said transfer device being constructed for transfer of a rod section from the rod magazine and for transfer of the rod section in the drilling rod axis of the drill rig, wherein the transfer device includes a gripping unit, said gripping unit including the first and second members, and a hydraulic drive to move the first and second members in the direction of the drilling rod axis, wherein the first member is configured as a guide and the second member is configured as a tube and is movable in the first member in the longitudinal direction, and wherein the hydraulic drive is arranged within the tube and includes a piston and a cylinder, with one member selected from the group consisting of the piston and the cylinder of the hydraulic drive being connected with the guide and with another member of the group being connected with the tube, wherein the gripping unit of the transfer device includes two gripping devices provided on the tube in spaced-apart relationship to one another for gripping a rod section in the rod magazine, wherein each of the gripping devices has gripping elements which are swingable about a pivot axis and acted upon by a wedge to move the gripping elements in a direction of their closed position, wherein the transfer device includes a spring to bias the gripping elements as to seek their open position.