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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 |
| 6980298 | System for monitoring sealing wear A system for determining at least one condition of a seal including an optical fiber for transmitting light from a light source. The optical fiber is embedded in the seal and operatively coupled to an interferometric system. The interferometric system is operatively... | 12/27/2005 |
| 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 |
| 5927439 | Sub-assembly for lubricating rock drill bit A lubricating sub-assembly for a rock drill, comprising a housing coupled into a drill string carrying a drill bit at its front end, a cavity disposed within the housing for holding a predetermined amount of a bearing lubricant, passages for communicating... | 07/27/1999 |
| 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 |
| 5337843 | Hole opener for the top hole section of oil/gas wells A hole opener used in conjunction with drilling in at least one of boulder and rubble stone formations includes first and second sets of cutters. Each of the cutters of the first and second sets of cutters has cutter teeth thereon and further include a sh... | 08/16/1994 |
| 5183123 | Indicating means for a rock bit lubricating system In order to detect when a lubricant is nearly depleted in a lubricant reservoir provided in a sealed rotary cutter rock drill bit, compressed air used for removal of cuttings is passed through a valve in the reservoir. As the lubricant is used up a compre... | 02/02/1993 |
| 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 |
| 4765205 | Method of assembling drill bits and product assembled thereby A method for assembling earth drill bits starts with a hollow shank body with a hollow pin with API regulation threads, for connection to a drill pipe, extending from one side, and hollow nozzle legs extending from the other side cast as a one piece inves... | 08/23/1988 |
| 4727943 | Rotary drill bit A drill bit for drilling into earth formations comprising a plurality of sections having connection means to connect said sections to form a unitary drill bit; means in said plurality of sections for storing and delivering lubricants to the cutting cones;... | 03/01/1988 |
| 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 |
| 4501338 | Grease pump for sealed bearing rotary cone rock bits A positive displacement grease pump apparatus is disclosed to circulate a lubricating grease from a grease reservoir system, formed within a body of a sealed bearing rotary cone rock bit. The relatively viscous grease is positively circulated to and from ... | 02/26/1985 |
| 4452323 | Valve assembly for drill bit lubrication system A valve system is disclosed for use in the lubrication passages of a rolling cutter drill bit, which valve assembly utilizes one or more reed valves to maintain flow of lubricant in a desirable direction.... | 06/05/1984 |
| 4446933 | Rotary earth boring drill bit with centrifugal lubrication system A drilling bit for drilling earthen material such as an oilwell rotary cone drilling bit which includes means for centrifugally providing lubricant to the drill bit cone bearing from a storage cavity. A storage cavity is provided for lubricant for the dri... | 05/08/1984 |
| 4412590 | Rock bit internal lubricant pump A rolling cutter rock drilling bit is disclosed which features an internal lubricant pump utilizing an internal elastomeric member moving across a grooved rigid surface to circulate lubricant in the bit bearings as a result of the shear forces on the lubr... | 11/01/1983 |
| 4390072 | Drill bit lubricant circulation system Discloses a lubricant circulating system for a rotary drilling bit including a lubricating space defined between a rotary cone cutter and a journal shaft extending from the bit body, the body defining a lubricant supply passageway connecting the lubricati... | 06/28/1983 |
| 4383577 | Rotating head for air, gas and mud drilling A rotating head assembly having roller thrust bearings rotatably journaling an inner barrel is provided with pump means for continuous forced circulation of lubricating oil to, and around, the thrust bearings during operation. A lubricating oil chamber su... | 05/17/1983 |
| 4381824 | Drill bit lubrication system A lubrication system is disclosed for a rolling cutter drill bit, which system utilizes solid or semi-solid sticks of lubricants located in internal channels and continuously biased against rotating surfaces in the bit.... | 05/03/1983 |
| 4183416 | Cutter actuated rock bit lubrication system Lubricant is circulated from a lubricant reservoir to the bearings of a rotary rock bit and back to the lubricant reservoir by a lubricant circulation system that is operated by rotation of the cone cutter upon the bearing pin of the bit. A seal is positi... | 01/15/1980 |
| 4181185 | Thrust flange actuated rock bit lubrication system Lubricant is circulated from a lubricant reservoir to the bearings of a rotary rock bit and back to the lubricant reservoir by a lubricant circulation system that is operated by rotation of the cone cutter upon the bearing pin of the bit. A seal is positi... | 01/01/1980 |
| 4167220 | System for lubricating the bearings of cutting rollers of a roller bit A system for continuous lubrication of bearings in a drilling apparatus including a roller bit having at least one pivot and a cutting roller rotatably supported on the pivot by bearings. The system comprises pumping means in the form of spiral or oblique... | 09/11/1979 |
| 4167219 | Viscous pump rock bit lubrication system Lubricant is circulated from a lubricant reservoir to the bearings of a rotary rock bit and back to the lubricant reservoir by a lubricant circulation system that is operated by rotation of the cone cutter upon the bearing pin of the bit. A spiral groove ... | 09/11/1979 |
