Patent ID: 9428960
Filing Date: 2016-08-30
CPC Classification: E21B

Claim Text:
1. Drilling unit comprising a carrier vehicle with a hydraulic supply, a mast, a carriage being movable along the mast, and a hydraulic cylinder for moving the carriage, the hydraulic cylinder including a cylinder housing, in which a piston with a piston rod is mounted to the mast by a connector so that the piston is displaced, wherein the cylinder housing is fixed to the carriage so as to move with the carriage, a first distributor is directly fixed at least to the carriage, the first distributor is connected to the hydraulic supply via at least one central supply line and a central return line, the first distributor includes at least one hydraulic connection for the hydraulic cylinder and one further hydraulic connection for driving a drive motor on the carriage by the hydraulic supply, whereby a rigid pipeline is provided along the mast between the hydraulic connection on the carriage and the hydraulic cylinder, a retaining element is arranged on the mast, a second distributor is arranged on the retaining element, the at least one central supply line and the central return line are connected to the first distributor via the second distributor, a flexible hydraulic tubing is provided, connecting the second distributor and the first distributor for moving of one end of the flexible hydraulic tubing with the carriage along the mast, and the hydraulic cylinder is connected via the at least one hydraulic connection for the hydraulic cylinder from the first distributor via the second distributor on the retaining element to the hydraulic supply.