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| Number | Title | Issue Date |
| 7182158 | Drilling device comprising a rotational drive In a drilling device with a drive unit for rotation and advance the rod assembly has a plurality of pipe sections interconnected by means of plug-type connections torque proof in both directions. A tension rod protrudes through the interior of the rod assembling. Th... | 02/27/2007 |
| 7111695 | Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium The invention relates to a method for horizontal ground drilling, in particular for rock drilling, by means of a ground drilling apparatus which can be driven forward in rotation and percussively, the apparatus having compressed air and drilling medium applied to it... | 09/26/2006 |
| 7093671 | Pneumatic rock-boring device and method for starting such a device The invention relates to a method for horizontal ground-boring, in particular for rock-boring, by a rotating and hammering driven ground-boring device, whereby the device is alternately or simultaneously supplied with compressed air and drilling medium and the compr... | 08/22/2006 |
| 7056065 | Device and method for changing lines A device for replacing lines without excavation including an annular overdrilling head and a drive for rotating a front module arranged on the drilling head. ... | 06/06/2006 |
| 7052049 | Rod linkage Rod linkage for rod segments for a horizontal earth drill, whereby the rod segment ends can be interconnected by displacing the rod segment axes in parallel. The invention relates to a rod linkage for horizontal earth drilling which is characterized in that the ends... | 05/30/2006 |
| 7048074 | Control system for a percussion drive The invention relates to a control system for a percussion drive of an earth drilling unit having a housing, a drilling tool, a pulling or thrusting drive, a percussion piston, a pressure chamber belonging to the percussion piston and a pressure medium feed, which c... | 05/23/2006 |
| 6969222 | Device for transferring rods The invention relates to a rod transfer device for horizontal driving units for underground trenchless driving, having a storage container and a pivotable gripper, the gripper being arranged in such a way that the orbit of the gripper intersects both the transfer re... | 11/29/2005 |
| 6725948 | Method of regulating the feed force of a drilling device In a method of regulating the feed force of a drilling device having a hydrostatic bore hole motor at the end of a linkage provided with a rotary and a feed drive, the feed of the linkage is set as a function of the pressure of the drive fluid for the bore hole moto... | 04/27/2004 |
