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| Number | Title | Issue Date |
| 7360612 | Roller cone drill bits with optimized bearing structures A roller cone drill bit may include optimally designed bearing structures and cutting structures. The roller cone drill bit may include three cone assemblies rotatably mounted on respective spindles via respective bearing structures. Each cone assembly may have a re... | 04/22/2008 |
| 7334652 | Roller cone drill bits with enhanced cutting elements and cutting structures Roller cone drill bits are provided with cutting elements and cutting structures optimized for efficient drilling of soft and medium formations interspersed with hard stringers. The cutting elements and cutting structures may be satisfactorily used to drill downhole... | 02/26/2008 |
| 7128171 | Hydrodynamic pump passages for rolling cone drill bit An earth boring bit has rotating cones with two lubricant passages to increase bearing capacity and cause lubricant circulation. A lubricant reservoir in the body supplies lubricant to passages between the cone and bearing pin. A pressure compensator equalizes lubri... | 10/31/2006 |
| 6357540 | Rotary drill bit with lip seal in roller cone bit A roller-cone drill bit in which a double lip seal, made of a self-lubricating elastomer, protects the bearings from the mud.... | 03/19/2002 |
| 6179469 | Rotation mechanism for rotating a ring A rotation mechanism for rotating a rotary ring which has the following features: the number of parts it requires will be reduced as much as possible; its configuration will be simple and economical to build; the operating drag of the ring will be low; an... | 01/30/2001 |
| 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 |
| 5853245 | Rock bit cutter retainer with differentially pitched threads A novel split threaded ring bearing member for rolling cutter drill bits with at least a portion of its threads having a different pitch than its mating threads is disclosed. The pitch difference is designed so that the threaded ring can be seated or othe... | 12/29/1998 |
| 5429200 | Rotary drill bit with improved cutter A rotary cone drill bit for forming a borehole having a body with an underside and an upper end portion adapted for connection to a drill string. The drill bit rotates around a central axis of the body. A number of angularly-spaced arms are integrally for... | 07/04/1995 |
| 5352045 | Means of mounting a revolving cutting element In an assembly made up of a spindle formed integrally with a revolving cutting element, the longitudinal axis of the spindle being the axis of rotation of the cutting element, the spindle is set into a cylindrical bearing. The bearing is fixed in the main... | 10/04/1994 |
| 5199516 | 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 conjuction with an attached pin having recesses therein receiving the upper ends of the legs.... | 04/06/1993 |
| 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 |
| 5092412 | Earth boring bit with recessed roller bearing A roller cutter earth boring bit having longer roller bearings recessed into surrounding bit structure for increased load carrying capacity. The elimination of thrust bearing shoulders from the bearing pin structure between sets of roller bearings enables... | 03/03/1992 |
| 5024539 | Friction bearing and cone retention thrust system for a rock bit A rotary rock cutter cone is rotatively supported while being axially located and retained on a cooperating cantilevered journal shaft depending from a rock bit body by plain friction bearing means. A primary stationary thrust face is provided by a radially ex... | 06/18/1991 |
| 4991671 | Means for mounting a roller cutter on a drill bit A rotary drill bit (10) having a roller cutter (28) retained on a journal (24) by an externally threaded retainer ring (52) mounted within an annular groove (48) in the journal (24). The radii (R1, R2) formed at the inner and outer corners of the groove (... | 02/12/1991 |
| 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 |
| 4900164 | Axial retainer for a cutter in a rotary drill bit A retainer for axially retaining a cutter on the journal pin of a rotary drill bit body includes a plurality of arcuate sliding keys and a single initial tensioning ring accommodated astride an annular groove formed in the peripheral outer wall surface of... | 02/13/1990 |
| 4880068 | Rotary drill bit locking mechanism The present invention is a rotary drill bit locking mechanism comprising a support spindle and a cutter cone with bearing surfaces. Furthermore, first and second annular grooves are formed on the bearing surfaces of the support spindle and the cutter cone... | 11/14/1989 |
| 4874047 | Method and apparatus for retaining roller cone of drill bit An improved apparatus and method for rotatably mounting and retaining a rock bit roller cone on a journal of a drill bit is disclosed. The bit body has at least one depending leg with an outer free end and an inner end continuous with the remainder of the... | 10/17/1989 |
| 4738323 | Thrust bearing and cone locking assembly for rock drill bit A thrust bearing and cone locking assembly for rotatably mounting the cutter cones on a rock drill bit is provided. The assembly includes a dual function thrust bearing and cone retainer capable of absorbing radial thrust and axial thrust in opposite dire... | 04/19/1988 |
| 4730681 | Rock bit cone lock and method A cutting cone on a rotary rock bit is captively retained on a journal pin by an annular array of ball bearings disposed in laterally facing annular races formed in the cone and pin. When a predetermined amount of surface wear has occurred between the con... | 03/15/1988 |
| 4722615 | Drilling apparatus and cutter therefor An underreamer including a body having a bore therethrough, an arm mounted at its upper end to the body, a conical cutter mounted for rotation on the lower end of each arm, a cup-shaped thrust bearing between the cutter and the arm, means extending throug... | 02/02/1988 |
| 4666000 | Rock bit cutter retainer An improved retainer for a rotary cone rock bit and a method for inserting the same is disclosed. A cone cutter is mounted on a bearing pin of an arm of the rotary cone drill bit. Formed in the bearing pin and the inner wall of the cone cutter is an annul... | 05/19/1987 |
| 4657091 | Drill bits with cone retention means There is disclosed a drill bit which is connectable to the lower end of a rotary drill string for use in drilling oil and gas wells as drilling mud is circulated downward through the string, out the bit, and upwardly within the annulus between the string ... | 04/14/1987 |
| 4625816 | Boring drill bit A boring drill bit comprises a shank having one end attached to a drill pipe; a plurality of inclined pins extending from the other end of the shank radially and at an inclination toward the ground with respect to the center line of the shank; a plurality... | 12/02/1986 |
| 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 |
| 4596472 | Thrust bearing and axial retainer system for rotary cone rock bits and method for assembling same An improved retention and thrust bearing system for accurately retaining and locating a rotary rock cutter cone upon a journal shaft supported by a rock bit body is disclosed. A rotary rock cutter cone is rotatively supported on a cooperating journal shaf... | 06/24/1986 |
| 4538928 | Screw ring cone retention apparatus and method for rock bits This invention teaches a means to retain a cutter cone onto a journal bearing of an earth boring rotary cone rock bit. Complementary and registering annular grooves are formed in the bearing surfaces of the journal and the cone. A tangential entry groove ... | 09/03/1985 |
| 4533003 | Drilling apparatus and cutter therefor An underreamer, hole opener, or expansible rotary drill bit including a body having a bore therethrough, an arm mounted at its upper end to the body, a conical cutter mounted for rotation on the lower end of each arm, a cup-shape thrust bearing between th... | 08/06/1985 |
| 4511008 | Rotary cutter drill bit with permanent snap ring cutter retention Structure for permanently retaining a rolling cutter on a journal pin of a rotary cutter earth boring bit is shown. The structure is defined by opposed, axially aligned, circumferential grooves formed in the mating bearing surfaces of the pin and the asse... | 04/16/1985 |
| 4506997 | Rock bit cone retention A rock bit cone retention means is disclosed which primarily utilizes a series of segmented rings. The segmented rings are inserted into a relatively deep annular channel formed transverse to the axis of either a journal or a cone of a rock bit leg assemb... | 03/26/1985 |
| 4499642 | Composite bearing A heavy-duty composite radial journal bearing and a method to produce it is described. A pattern of openings is formed through a bearing sleeve representing, for instance, axially aligned metal bars. The openings are subsequently filled wth a metal dissim... | 02/19/1985 |
| 4491428 | Earth boring drill bit with snap ring cutter retention Disclosed herein is an earth boring bit of otherwise conventional construction except for the bearing and cutter retention. A snap ring is used to retain the cutter, the grooves that receive the ring and the ring construction being such that the ring is f... | 01/01/1985 |
| 4478299 | Rock bit construction A rotary earth boring drill is provided having a body structure with a plurality of depending cutter supporting legs having integral spindles extending transversely therefrom. Rotary cutter cone elements are supported by split bushings, roller bearings or... | 10/23/1984 |
| 4445791 | Rotary drill bit ball plug A removable ball loading hole plug for a rotary cutter rock drilling bit having an offset head portion to position the inner race end axially and rotationally. A locking groove on the outer surface of the offset head portion coacts with an adjacent end of... | 05/01/1984 |
| 4444518 | Rock bit cone retention means A rock bit cone retention means is disclosed which primarily utilizes a series of segmented rings. The segmented rings are inserted into a relatively deep annular channel formed transverse to the axis of either a journal or a cone of a rock bit leg assemb... | 04/24/1984 |
| 4344658 | Earth boring drill bit with snap ring cutter retention Disclosed herein is an earth boring bit of otherwise conventional construction except for the bearing and cutter retention. A snap ring is used to retain the cutter, the grooves that receive the ring and the ring construction being such that the ring is f... | 08/17/1982 |
| 4260203 | Bearing structure for a rotary rock bit A rotary rock bit is disclosed having bearing surfaces utilized therein which have extremely long wear resistant properties. The rock bit comprises a plurality of legs extending downwardly from a main bit body. A cone cutter is rotatively mounted on a jou... | 04/07/1981 |
| 4255000 | Rotary drill bit A rotary drill bit assembly comprising a trunnion and at least one rotary cutter mounted on the trunnion. The trunnion is supported by bearings including at least one radial bearing and at least one axial roller bearing. The axial bearing is comprised of ... | 03/10/1981 |
| 4236764 | Earth boring drill bit with snap ring cutter retention Disclosed herein is an earth boring bit of otherwise conventional construction except for the bearing and cutter retention. A snap fit ring is used to retain the cutter, the grooves that receive the ring and the ring construction being such that the ring ... | 12/02/1980 |
| 4220377 | Earth boring bit with eccentrically machined bearing pin A rolling cone cutter earth boring bit is provided with an improved bearing system including reduced clearance bearing surfaces and a space for lubricant. At least one cantilevered bearing pin extends from the arm of the bit. A rolling cone cutter is rota... | 09/02/1980 |
