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| Number | Title | Issue Date |
| 7363734 | Lubricated trench wall cutter with remote lubricant inlet port The invention relates to a trench wall cutter comprising a bearing shield, on which at least one cutting wheel is supported in a rotatable manner. Between the cutting wheel and the bearing shield at least one sealing member is provided. For the lubrication of the se... | 04/29/2008 |
| 7341258 | Cammed seal assembly with sealing ring having an angled leg portion and foot portion with elastomeric energizer element A seal assembly seals first and second operational surfaces spaced apart by a gap. The first surface includes a seal groove having a base surface and first and second side surfaces. A sealing element in the seal groove has a foot portion extending parallel to the ba... | 03/11/2008 |
| 7246440 | Spindle motor and method of manufacturing the same A spindle motor is formed so as to support a pivot of a rotor by a pair of open bearings. The open bearings thus constructed will be less expensive and simple structures, so that a manufacturing cost thereof is reduced compared to a conventional spindle motor... | 07/24/2007 |
| 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 |
| 7096570 | Tubing expansion tool In an embodiment of the invention, there is disclosed a tubing expansion tool (300) comprising a body (302) adapted for rotation within tubing to be expanded, and three expansion member modules (306) each comprising an expansion member (310 | 08/29/2006 |
| 6619412 | Protected lubricant reservoir for sealed earth boring drill bit A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a beari... | 09/16/2003 |
| 6578647 | Sealing structure for a rock drill bit A sealing structure for a rock drill bit includes an elastomeric diaphragm for installation in the drill bit so as to separate grease from drilling mud. The diaphragm has an aperture extending through it, and a plug is disposed in the aperture so as to fo... | 06/17/2003 |
| 6460635 | Load responsive hydrodynamic bearing A load responsive hydrodynamic bearing is provided in the form of a thrust bearing or journal bearing for supporting, guiding and lubricating a relatively rotatable member to minimize wear thereof responsive to relative rotation under severe load. In the ... | 10/08/2002 |
| 6416224 | Rolling cutter drill bits A rolling cutter drill bit comprises a body and three legs, each leg having a cantilevered bearing spindle, a roll cutter rotatably mounted on the bearing spindle, a lubricating system within the spindle, and a tubular bearing element located radially bet... | 07/09/2002 |
| 6405811 | Solid lubricant for air cooled drill bit and method of drilling A solid lubricant is added to the internal passages of an air cooled bit such that the air erodes, or ablates, the solid lubricant into the air stream. Compressed air travels down the drill stem to the bit. The air passes through an air tube into the main... | 06/18/2002 |
| 6372695 | Ball screw A ball screw is provided which makes it easy to determine the degree of deterioration of lubricating grease so that new lubricating grease can be supplied efficiently without loss. The ball screw includes a threaded shaft formed with a thread groove in it... | 04/16/2002 |
| 6296067 | Protected lubricant reservoir for sealed bearing earth boring drill bit A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a beari... | 10/02/2001 |
| 6206110 | Protected lubricant reservoir with pressure control for sealed bearing earth boring drill bit A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a beari... | 03/27/2001 |
| 6202766 | Relief valve In a drill bit which has a reservoir for storing a supply of lubricant, generally grease, a lubricant passage is formed for flow of lubricant from the reservoir to the bearing. A relief port is formed in the drill bit body to connect at least one of the r... | 03/20/2001 |
| 5992943 | Wheel end assembly A wheel mount for a wheel comprises a spindle, a hub for surrounding the spindle and a bearing assembly interposed between the spindle and the hub. The spindle extends from an end of an axle of a vehicle and has a generally decreasing diameter from its pr... | 11/30/1999 |
| 5944125 | Rock bit with improved thrust face A rotary cone drill bit includes a drill bit body having two or more support spindles extending inward and downward toward a vertical axis of the drill bit body. Each support spindle of the drill bit includes a base pin and further includes a pilot pin ex... | 08/31/1999 |
| 5931241 | Hydrostatic thrust face lubrication system A rolling cutter drill bit comprises a main body and three depending legs, each leg having a cantilevered bearing spindle on which a rolling cutter is rotatably mounted. Bearings located between the cutter and spindle include a radial bearing, and a thrus... | 08/03/1999 |
| 5868502 | Thrust disc bearings for rotary cone air bits A first embodiment of a radially disposed thrust bearing assembly for rotary cone rock bits consists of a first non-rotating radially disposed steel thrust bearing disc and an adjacent, carbide thrust bearing disc. One of the thrust bearing discs is press... | 02/09/1999 |
| 5725313 | Rolling cutter drill bits A rolling cutter drill bit comprises a body and three legs, each leg having a cantilevered bearing spindle, a rolling cutter rotatably mounted on the bearing spindle, lubricant delivering means within the beating spindle, and a floating thrust bearing ele... | 03/10/1998 |
| 5628375 | Thrust face lubrication system for a rolling cutter drill bit A rolling cutter drill bit comprises a main body and three depending legs, each leg having a cantilevered bearing spindle on which a rolling cutter is rotatably mounted. Bearings located between the cutter and spindle include a radial bearing, and a thrus... | 05/13/1997 |
| 5558172 | Earth boring bit and lubricator compensation therefor A well drilling bit comprises a bit body with a centralized portion and a plurality of radially and circumferentially spaced legs depending longitudinally therefrom. A respective cutter body is rotatably mounted on the free end of each leg with bearing me... | 09/24/1996 |
| 5527113 | Rock bit bearing material The use of a sintered compact of a copper base alloy, a transition metal, a metalloid and a strengthener for bearing surfaces formed between roller cutter cones of sealed bearing rock bits.... | 06/18/1996 |
| 5520257 | Bit with ball plug compensator having pressure relief means A shaft boring bit has a bit body with at least one saddle member secured to the bit body. The saddle receives and supports the ends of a journal member. A cutter is mounted for rotation on the journal member and an anti-friction bearing is disposed betwe... | 05/28/1996 |
| 5477934 | Lubricating mechanism and method for a rotary cutter A cutter mounted on a boring head includes a shaft and a roller body rotatably mounted thereon The greasing of bearings disposed between the roller body and shaft is achieved through an axial bore formed in the shaft and into which a filling plug is inser... | 12/26/1995 |
| 5441120 | Roller cone rock bit having a sealing system with double elastomer seals A roller cone rock bit (10) is provided that has a sealing system with double elastomer seals. A first elastomer seal (30) is disposed between a cone (18) having a cavity (24) and a spindle (16). A second elastomer seal (32) is disposed between cone (18) ... | 08/15/1995 |
| 5363930 | Dual-diaphragm lubricant compensator for earth-boring bits An earth-boring bit has a bit body and at least one saddle member secured to the bit body to receive and support each of a pair of ends of a journal member. A cutter is mounted for rotation on the journal member and a bearing is defined between the cutter... | 11/15/1994 |
| 5307887 | Earth boring bit with improved thrust bearing An earth boring bit having a body and a cantilevered bearing shaft extending inwardly and downwardly from the body. A rotatable cutter with an open end is assembled over the shaft, which has a radial bearing surface formed around a longitudinal axis. The ... | 05/03/1994 |
| 5265964 | Lubricant system for a rotary cone rock bit A radially disposed thrust bearing surface formed in a rotary cone is provided with at least a pair of grooves and a ramp surface on the trailing edge of the grooves. The groove provides a lubricant reservoir and the ramp serves to generate hydrodynamic p... | 11/30/1993 |
| 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 |
| 5188462 | Lubricant system for a rotary cone rock bit A radially disposed thrust bearing surface formed in a rotary cone is provided with at least a pair of grooves and a ramp surface on the trailing edge of the grooves. The groove provides a lubricant reservoir and the ramp serves to generate hydrodynamic p... | 02/23/1993 |
| 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 |
| 5099932 | Rock drill bit lubricant circulating system The present invention provides a lubricant circulation system for a rock drill bit which circulates a flow of lubricant over the bit bearing surfaces to keep the bearings optimally lubricated and free to particulate contaminants from the drilling process.... | 03/31/1992 |
| 5072795 | Pressure compensator for drill bit lubrication system A fluid pressure compensator for a lubrication system in a rotary drill bit includes a diaphragm (44) with an enlarged thickness central portion (62) having a generally hemispherically shaped deformation (72) at its center to form a minimal thickness ther... | 12/17/1991 |
| 5027911 | Double seal with lubricant gap between seals for sealed rotary drill bits This invention relates to a rotary drill bit having a body with leg members, where each of the leg members has a projecting conical cutter receiving journal. A conical cutter having an axially extending recess open at one end has friction reducing bearing... | 07/02/1991 |
| 4942930 | Lubrication system for an earth boring drill bit and methods for filling and retrofit installing thereof A lubrication system for an earth boring drill bit having a pressure compensator for minimizing the pressure differential between the drill bit lubricant and the well bore fluid is improved in a manner to prevent sharp edges in the lubricant reservoir wal... | 07/24/1990 |
| 4887675 | Earth boring bit with pin mounted compensator An earth boring (rock) bit having a flexible diaphragm located inside the bearing shaft in a cavity between a threaded lug and a mating bearing sleeve. The diaphragm has an enlarged periphery, shaped somewhat like an o-ring, that is confined and sealed be... | 12/19/1989 |
| 4865136 | Pressure relief valve for roller bit A one-way pressure relief valve assembly is provided for venting the lubricant reservoir of a roller-type well drilling bit. The valve assembly is mounted in the cap of the lubricant reservoir, to open outwardly, and is adapted to provide hydrostatic load... | 09/12/1989 |
| 4793719 | Precision roller bearing rock bits A sealed bearing roller cone rock bit is disclosed having precision roller bearings with very close fits. The bearing package includes highly refined and hardened surface finishes, special roller bearing metal materials and lubricants with specific lube v... | 12/27/1988 |
| 4749053 | Drill bit having a thrust bearing heat sink A roller cutter drill bit adapted to drill bores in the earth comprising a bit body of steel having a plurality of bearing journals at its lower end, and a plurality of roller cutters, each having a recess therein receiving one of the journals. A radial b... | 06/07/1988 |
| 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 |
