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| Number | Title | Issue Date |
| 6644887 | Device for connecting a towed pipe to a towing apparatus A device for connecting a towed pipe to a towing apparatus, for example a percussion boring machine or a towing head, comprises an adapter sleeve adapted to the towing apparatus and a towed pipe of which the connecting end is, for example, provided with l... | 11/11/2003 |
| 6510905 | Earth boring apparatus In the case of an earth boring apparatus, preferably a thrust boring apparatus, the head of which is actuated by a pneumatically operated reciprocating ram, a supply hose (5) provides the connection from a compressor as an example to the thrust boring app... | 01/28/2003 |
| 6491476 | Method and apparatus for the trenchless laying of pipework underground Apparatus and method for the trenchless laying of pipework underground, having a total and a gauge for the continuous widening of a preferably wound preformed pipe on a linkage for use in pits of small dimensions, preferably inspection shafts of sewage sy... | 12/10/2002 |
| 6406215 | Positive connection between a pipe and a ring inserted into the pipe A positive connection between a pipe and a ring inserted into the pipe, in particular between the housing of a ram boring device and a stop ring inserted into the housing, wherein the inside wall of the pipe has a convex groove consisting of a section of ... | 06/18/2002 |
| 6402524 | Data transfer system A system for transfer of data or electric current for a steerable horizontal boring machine for laying and destructive replacement of supply lines, which is suitable both for percussive and for rotary drilling operation and permits reliable and problem-fr... | 06/11/2002 |
| 6352128 | Steered-head ram drilling tool In a ram drilling tool having a steering element, for example a steering head, which is mounted in the tool casing such that it can move, for example rotate, the tool casing is connected to a pressure-medium line such that it cannot rotate and to a sleeve... | 03/05/2002 |
| 6340270 | Apparatus and method for the longitudinal splitting of pipes laid underground An apparatus for longitudinal splitting, in particular longitudinal slitting, of pipes laid underground and for the simultaneous trenchless pulling-in of a new pipeline comprises a carriage in the form of a frame, in which a cutting wheel for cutting open... | 01/22/2002 |
| 6267187 | Boring apparatus with coupling for rapid connection of drill string segments In apparatus for producing and expanding earth boreholes and for destroying and replacing underground pipelines or for driving in pipes, a feed drive and a rotary drive having a plug-in coupling comprising a chuck and a locking portion at the end of a str... | 07/31/2001 |
| 6244783 | Widening apparatus An apparatus for widening microtunnels and/or for the destruction and replacement of ground-laid pipework and for the laying of new pipework possesses a tool which displaces the earth and/or destroys and/or displaces pipework laid in the earth, having a h... | 06/12/2001 |
| 6238141 | Apparatus for static underground drilling In an apparatus for drilling in earth, a push-pull linkage, especially a ladder-type linkage consisting of individual sections connected together in each case by a plug-in coupling, is connected to a push-pull drive, and a stationary locking pawl and a th... | 05/29/2001 |
| 6199643 | Method and apparatus for directional boring In directional boring using a boring apparatus having a driven string and a drill head with an excavating tool moving in an orbit about the longitudinal axis of the string, the tool moves with substantially constant angular velocity when boring straight a... | 03/13/2001 |
| 6142244 | Percussion boring machine with run monitoring In a percussion boring machine having run monitoring a measuring and transmitting unit and an above-ground receiver the pneumatically or hydraulically driven and controlled striking piston (3) reciprocates between the tip of the machine and a rear stop (8... | 11/07/2000 |
| 6138775 | Boring machine In a percussion boring machine for producing or widening earth boreholes, the housing is equipped with nozzles and houses a striking piston caused to reciprocate axially by means of compressed air and means of generating pressure which supplies the nozzle... | 10/31/2000 |
| 5980157 | Ground-boring machine The invention pertains to a machine for producing or widening ground bores and/or for shattering old pipelines and laying new pipelines, consisting of a push-pull unit and a rod assembly that is connected to and driven by the push-pull unit and extends th... | 11/09/1999 |
| 5975221 | Machine for horizontal percussion boring In a machine for horizontal or inclined percussion boring in the ground having a percussion boring string which has an oblique-face boring head at one end and an impact mechanism at the other end, the impact mechanism is mounted beside the rotary drive in... | 11/02/1999 |
| 5960892 | Automatically driven pile driver drilling device The invention relates to an automatically driven pile-driver drilling device for drilling into the earth with a percussion piston moving axially inside a casing, driven by a pressure medium and changeable from a forward stroke to a backstroke, with a work... | 10/05/1999 |
| 5954209 | Boring rod magazine A boring-rod magazine which can be moved into the drilling axis of a boring machine. The boring-rod magazine may contain a plurality of boring rods, and holds a boring rod to position it in the drilling axis, and then releases the boring rod when boring-r... | 09/21/1999 |
| 5954145 | Reversible percussion piston drill apparatus In a percussion drill apparatus for soil drilling with a percussion piston which is moving to and fro within a housing, a control sleeve is mounted on a control tube which protrudes into the percussion piston chamber, the axial position of which determine... | 09/21/1999 |
| 5937954 | Method for directional drilling In a method for directional drilling with the aid of a drilling device having a drill pipe and a mining tool which moves on an orbit, the tool moves at an essentially constant angular velocity during straight drilling and the angular velocity is periodica... | 08/17/1999 |
| 5937956 | Ram boring machine A ram-boring machine with forward and reverse motion control which comprises a percussion piston that can be axially displaced in a tubular housing, a control tube that is arranged in the housing and controls the forward and reverse motion of the percussi... | 08/17/1999 |
| 5895176 | Device for connecting a pipeline conduit to a ground-boring machine A device for connecting a pipeline conduit to a ground-boring machine or for replacing old pipes and inserting the end of an individual pipe into a sleeve joint of the preceding pipeline conduit, comprising a tensioning frame that can be attached to the e... | 04/20/1999 |
| 5876152 | Ramming drill for destructive replacement of buried pipelines Ramming drill for destructive replacement of buried pipelines with a conical tip, a crushing head set onto the conical tip with radial cutters and a traction cable acting on the equipment tip.... | 03/02/1999 |
| 5833015 | Method and apparatus for sinking pipes or cables into a pilot borehole Method and apparatus for sinking pipes (8) or cables into a pilot borehole (4) by use of a drill string (3) including an expansion drill bit driven to rotate and pull is disclosed. The expansion drill bit is supplied with a wash fluid and is coupled with ... | 11/10/1998 |
| 5795991 | Arrangement of an impact-sensitive device in a housing Arrangement of an impact-sensitive device in a housing, particularly a transmitter for locating a drilling device located in a borehole in the ground, wherein the device is maintained within same by means of at least one impact-damping buffer at least in ... | 08/18/1998 |
| 5558167 | Percussion boring machine A percussion boring machine having an impact piston axially movable in a housing, a control pipe connected to a compressed air hose and an elastic separator fitted between the housing and the control pipe and held under axial compression, whereby assembly... | 09/24/1996 |
