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| Number | Title | Issue Date |
| 8011456 | Rotationally indexable cutting elements and drill bits therefor A cutting element for use with a drill bit includes a substrate having a longitudinal axis, a lateral surface substantially symmetric about the longitudinal axis and one or more key elements coupled to the lateral surface. The lateral surface lies between an inserti... | 09/06/2011 |
| 7017683 | Cutter for tunnel boring machine A cutter for a tunnel boring machine is equipped with a cutter body (1) with a slanting surface (2), a cylindrical contact surface (12) and a preferably tapered threaded portion with specially designed threads (6), a clamping ring (4 | 03/28/2006 |
| 6742608 | Rotary mine drilling bit for making blast holes A rotary mine drilling bit for making blast holes having a connection at one end of the body for attachment to a drill string and the second end of the body having a plurality of longitudinally extending slots. A thrust shoulder is provided between the ends of the b... | 06/01/2004 |
| 6170582 | Rock bit cone retention system A roller cone drill bit includes a bit body adapted to be rotated about a longitudinal axis. At least one leg depends from the bit body, and a journal is cantilevered from the leg. A roller cone is rotatably mounted on the journal. A cone retention member... | 01/09/2001 |
| 5465800 | Rolling cutter drill bits A method of manufacturing a rolling cutter drill bit comprising a bit body which carries cutter assemblies each of which includes a cutter journal on the bit body, a cutter rotatably mounted on the journal, and a threaded retention ring screwed onto the c... | 11/14/1995 |
| 5137097 | Modular drill bit A modular drill bit mounts legs within recesses in a body which are parallel to the central axis of the body using threaded studs with tapered outer portions, in conjunction with an attached pin having recesses therein receiving the upper ends of the legs... | 08/11/1992 |
| 4911255 | Means for retaining roller cutters on rotary drill bit A roller cutter (28) of a drill bit (10) is retained on a journal (24) for rotation by a retainer ring (82) having external screw threads (88) which are threaded onto mating screw threads (108) on the roller cutter (28) for rotation therewith. The retaine... | 03/27/1990 |
| 4865137 | Drilling apparatus and cutter An underreamer including a body having a bore therethrough, an arm mounted at its upper end to the body, a sleeve member detachably secured to the lower end of each arm and adapted to receive the frictional wear caused by the rotation of the conical cutte... | 09/12/1989 |
| 4600064 | Earth boring bit with bearing sleeve An earth boring bit having an improved two piece bearing construction using an internally tapered and threaded, cantilevered bearing lug extending obliquely inwardly and downwardly from a leg carried by the body of the bit. An internally tapered and threa... | 07/15/1986 |
