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| Number | Title | Issue Date |
| 7255182 | Ground drilling tool A back bit (20) is disclosed which is to used in conjunction with drilling equipment (10) which may include a derrick (11), a drilling pipe (12), a back head (14), a starting rod (13), and a cutting bit (15) mounted t... | 08/14/2007 |
| 7168509 | Percussive reamer and method of use thereof A percussive drill bit or reamer having a plurality of bit segments formed into a circular pattern suitable for drilling or reaming a hole. The bit segments are close-fitted and shaped to increase the cutting area and improve efficiency. Pressurized air exhausted fr... | 01/30/2007 |
| 7025536 | Tandem apparatus for bursting and replacing pipe A tandem rod or cable apparatus for bursting and replacing pipe, which includes a frame, two sets of oppositely-disposed hydraulic cylinders having piston rods, each of which pairs of piston rods are attached to a yoke, with a gripping element provided in each yoke ... | 04/11/2006 |
| 6283229 | Impact device for directional boring An impact boring tool according to the invention suitable for using with a directional boring machine has a tubular housing and a head mounted at a front end of the housing. The head preferably includes a chisel configured for breaking loose rocks and sto... | 09/04/2001 |
| 5339909 | Apparatus for making earth bores An apparatus for making earth bores with simultaneous emplacement of pipe, especially for making well bores, includes an earth boring device (10) with a drive device (12) and a displacement head (14) coaxial with the drive device (12). The outer diameter ... | 08/23/1994 |
| 5127481 | Percussion boring machine for destructive replacement of buried pipelines A percussion boring machine for destructive replacement of buried pipelines, having an opening-out cone at the back of the machine housing and cutters spaced in front of said cone, wherein the cutters form part of a breaking-up head slipped on to the hous... | 07/07/1992 |
| 4858703 | Self-propelled subsoil penetrating tool system A fluid-operated self-propelled subsoil penetrating tool of the type including an elongated housing member having a penetrating nose portion capable of ejecting a jet of liquid under high pressure to break up and disrupt the subsoil adjacent such nose por... | 08/22/1989 |
| 4732222 | Ram boring machine with impact blade piston In a ram boring machine for laying pipelines without trenching, a double blade that is axially moveable against a compression spring is housed in an impact tip and projects through slots in the impact tip. The double blade is struck by a striker piston an... | 03/22/1988 |
