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| Number | Title | Issue Date |
| 7128165 | Excavation system and method A system and method of cutting a core out of a finished surface for keyhole excavation provides a truck with a turret to which a support arm supporting the cutter assembly is mounted, and a stabilizing member remote from the turret, which allows the turret to be rot... | 10/31/2006 |
| 5555947 | Mole launcher and a method of operating a mole launcher A mole launcher which has a hydraulically powered, double-acting piston and cylinder unit to push or pull a slider. The slider carries a drill head connected to a drill string. The other end of the drill string carries a mole to bore an underground passag... | 09/17/1996 |
| 5517774 | Earth boring rotary tool with axial feed A hydraulic motor is mounted on top of a hydraulic cylinder barrel. The barrel houses a drive shaft that is rotated by the motor. A male hex drive shaft, attached to the drive shaft, extends downward through the barrel. A piston is mounted within the barr... | 05/21/1996 |
| 4306626 | Hydraulic earth boring machine A hydraulic earth boring machine for forming conduit passageways beneath established surfaces such as roadways, walkways, or the like. The boring machine includes a hydraulic cylinder having an open axial passageway for receiving a boring shaft. A drive c... | 12/22/1981 |
| 4261251 | Kelly head for hydraulic mast digger A hydraulic mast digger has a kelly head with improved retaining and sealing features. The digger is of the type having a kelly with a bearing assembly mounted between the kelly and a bearing sleeve. The bearing sleeve is reciprocally carried in the hydra... | 04/14/1981 |
| 4189186 | Tunneling machine A diametrically compact tunneling machine for boring tunnels is disclosed. The machine includes a tubular support frame having a hollow piston mounted therein which is movable from a retracted position in the support frame to an extended position. A drive... | 02/19/1980 |
| 4062412 | Flexible shaft drilling system In an apparatus for drilling long holes in the surface of a rock bed for installation of roof bolts where the working distance perpendicular to the surface is limited, a flexible, segmented shaft drill string is fed along a curved path to a mechanism posi... | 12/13/1977 |
| 3957125 | Multi-stage double-acting extendible and contractible shaft drive for drilling device A uniquely integrated arrangement of concentric tubes in combination with concentric pistons and special interconnecting fluid pressure passages therein, said component members cooperating in a manner as to permit extreme compound extension or retraction,... | 05/18/1976 |
