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| Number | Title | Issue Date |
| 7458430 | Attachment means for drilling equipment The invention is an attachment means for a ground drilling or cutting tool (10) that enables cutting elements (11) to be removably secured to the tool (10). The attachment means include a first surface (13) on the cutting element (11 | 12/02/2008 |
| 7195085 | Drill bit An expandable drill bit comprises a body for mounting on a support string and two roller cutters mounted on the body. The cutters are movable between a smaller diameter first configuration and a larger diameter second configuration. In one embodiment the bit is adap... | 03/27/2007 |
| 7040712 | Shield tunneling method and shield tunneling machine An excavating drive (22) movable backward/forward is accommodated in a turnable body (9) which in turn is turnable about an axis perpendicular to an axis of and in a skin plate (7). A cutter device (38) ahead of a rotor (22) in the... | 05/09/2006 |
| 4690228 | Changeover bit for extended life, varied formations and steady wear A roller cone bit may be used as a rotating drag bit by treating the roller cones as carriers for a plurality of distinguishable types of drag cutters. The roller cones are each coupled to a mechanism which selectively allows rotation of the roller cones.... | 09/01/1987 |
| 4610318 | Rotary cutter assembly A rotary cutter assembly comprises a drill head having a plurality of receptacles which releasably receive rolling cutter bit assemblies. The bit assemblies are locked in position by a locking sleeve connecting transverse fluid passageways of the drill he... | 09/09/1986 |
| 4448270 | Variable diameter earth boring bit An earth boring bit is shown of the type used to cut a shaft in the earth. The earth boring bit has a central bit body which is adapted to be driven to cut a shaft and which has an outer conical surface thereon. An outer ring segment carried on the centra... | 05/15/1984 |
| 4158973 | Rolling cutter drill bit A rolling cutter drill bit is disclosed which utilizes a main body having a threaded end for connection in a drill string, and a plurality of rolling cutter assemblies joined to the bottom of the bit body by means such as electron beam welding.... | 06/26/1979 |
| 4010808 | Expandable raise bit A bit is provided that includes a bit body defining a bit axis of rotation. Primary cutter means are positioned on the bit body for disintegrating the formations out to a first radial distance from said bit axis of rotation. Secondary cutter means are ada... | 03/08/1977 |
