Patent ID: 8028769

Claim:
A reamer bit for downhole earth boring operations comprising: a reamer body having an axis and an exterior cylindrical surface; cutter mounts attached to and spaced around the cylindrical surface of the body, each of the mounts extending outward from the cylindrical surface of the body, each of the mounts having an upper end that inclines relative to the axis, and each of the mounts having an outer surface; a cutter rotatably attached to a lower end of each mount; a plurality of stabilizer pads mounted to the cylindrical surface of the body, each of the stabilizer pads having an outer surface spaced substantially a same distance from the axis as the outer surface of each of the mounts, and each of the stabilizer pads having an upper end that inclines at a same angle as the upper ends of the mounts and is located at the same elevation on the body as the upper ends of the mounts; each of cutter mounts having side walls and each of the stabilizer pads having side walls that join the cylindrical surface of the body, each of the side walls of each of the stabilizer pads being opposed to and circumferentially spaced from one of the side walls of one of the cutter mounts, defining an open segment of the cylindrical surface between each of the side walls; a drill shaft extending from a lower end of the body; and a pilot bit affixed to a lower end of the drill shaft.