Abstract: A reamer bit for reaming in earth formations. In one embodiment, the bit provides a plurality of levels of stems onto which may be disposed semi-spherical reamer cutters. The cutters are arranged such that they are circumscribable within a sphere. The levels of stems may include as few as two stems or several. This arrangement provides for a significantly larger cutting area which, in turn, prevents premature bit wear. As s further advantage, the bit may include several levels with roller cutters having progressively increasing diameter to provide an arrangement which subscribes to a generally triangular formation.

Abstract: A reamer bit for reaming in earth formations. In one embodiment, the reaming bit provides spherical reaming faces with replaceable cutting bit holders. The holders include cutting bits. The spherical reaming faces are not appreciably susceptible to drag during a reaming procedure and premature wear of the faces is alleviated by the provision of bits. The overall result is a substantially improved apparatus for reaming which assists in cost reductions for the process.

Abstract: A drilling apparatus for directional drilling. A freely moveable connecting plate is seated in a seating provided for in a drill string motor support. The plate connects a drill string motor and a cylinder drive so that any mechanical stress transmitted by a drill string connected to the motor is substantially damped by the moveable plate. The result is that the drill string remains relatively true running to accurately bore while additionally preventing mechanical stress from damaging the cylinder, drill string motor or support therefor.

Abstract: There is disclosed an apparatus and method for drilling underground. The apparatus includes a conventional drilling bit and a shroud disposed around the drill bit to produce a confined for the suspension of drilling debris. The debris is withdrawn under suction from the area by a conduit system associated with the shroud and a cyclonic filter structure.