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| Number | Title | Issue Date |
| 8028770 | Conformal bearing for rock drill bit A rock drilling bit having PDC radial bearings has journal and cone bearing surfaces with increased contact area to increase load support. The radius of curvature of the bearing pin journal and cone bearing surfaces are matched or conformed on the bearing pressure s... | 10/04/2011 |
| 7971660 | Rock bit with a thermal insulating seal ring positioned in the seal gland A rock bit includes a shaft and a cone mounted for rotation about the shaft at a journal bearing. A seal gland for the rock bit is defined at least by the shaft and the cone. A compressible seal ring is positioned within the seal gland. A thermal insulating ring is ... | 07/05/2011 |
| 7832505 | Rock bit with a thermal insulating seal ring positioned in the seal gland A rock bit includes a shaft and a cone mounted for rotation about the shaft at a journal bearing. A seal gland for the rock bit is defined at least by the shaft and the cone. A compressible seal ring is positioned within the seal gland. A thermal insulating ring is ... | 11/16/2010 |
| 7743854 | Well jet device and the operating method thereof The device comprises a body provided with bypass ports embodied therein and an insert with a jet pump and sealing elements. The insert comprises a pass channel, a channel for supplying an active medium to the pump nozzle, a channel which is used for supplying a pump... | 06/29/2010 |
| 7721827 | Rock bit having a seal gland with a conical sealing surface A drill bit includes a bit head and a rotating bit cone. A sealing system for the drill bit includes a seal gland and a seal retained within the seal gland. The seal gland is defined by a radial cone surface, a head sealing surface and an opposed cone sealing surfac... | 05/25/2010 |
| 7559381 | Surface textures for earth boring bits A texture pattern is applied to bearing surfaces of earth-boring bits, especially the bearings of earth boring bits of the roller cutter variety. The textured surface that may be applied to either or both sides of the thrust washer faces, bearing faces, inlays, or t... | 07/14/2009 |
| 7413037 | Metal face seal for an earth-boring bit A metal face seal for an earth boring drill bit where the drill bit has a bit body, at least one bit leg, a bearing pin on each bit leg, and a cone rotatably mounted on each bearing pin. The metal face seal is located in the cavity formed between the interior surfac... | 08/19/2008 |
| 7387177 | Bearing insert sleeve for roller cone bit An earth boring bit has a bearing pin with a sleeve mounted on it. The sleeve is fixed against rotation but able to float relative to the bearing pin. A cone fits over and forms a bearing surface with the sleeve. The sleeve and bearing pin are configured to have a c... | 06/17/2008 |
| 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 |
| RE40197 | Drill bit having an improved seal and lubrication method using same A drill bit (100) for drilling a wellbore that traverses subterranean formations includes a drill bit body (106) having a plurality of journal pins (112), each having a bearing surface (128), and a rotary cutter (104) rotatably mou... | 04/01/2008 |
| 7347290 | Multi-part energizer for mechanical seal assembly An energizer for a mechanical seal assembly for use in a drill bit is disclosed. The energizer is a composite of at least two resilient materials, one having a durometer hardness that is greater than the other. The material contacting a journal provides relatively h... | 03/25/2008 |
| 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 |
| 7237627 | Bearing and lubrication system for earth boring bit Methods and apparatus for maintaining lubrication of rolling cone cutters mounted on journal pins. Embodiments comprise a rotating cone disposed on a journal pin and forming a journal gap there between. A cylindrical journal sleeve is disposed in the journal gap. Th... | 07/03/2007 |
| 7234541 | DLC coating for earth-boring bit seal ring An earth-boring bit has a seal assembly with a seal face having a DLC coating. The seal assembly locates between a bearing pin and a cone of the bit. The seal assembly has at least one rigid ring that rotates against a mating surface. The DLC coating is diamond-like... | 06/26/2007 |
| 7188691 | Metal seal with impact-absorbing ring Disclosed is a seal assembly for dynamically sealing between rotatable members, such as employed to seal the rolling cone of a rock bit. One preferred assembly includes an energizer, first and second seal rings, and a cushioning ring having an L-shaped cross-section... | 03/13/2007 |
| 7168147 | Method for manufacturing a drilling tool with an elastomer seal having graded properties A method of forming a seal for a subterranean drilling tool employs irradiation. The seal is formed of a single homogeneous elastomeric material. The seal has an exterior surface with at least one portion that is in sliding engagement with part of a seal gland of th... | 01/30/2007 |
| 7117961 | Dynamic seal with soft interface A device and method for dynamically sealing between rotatable members such as a rolling cone of a rock bit. The assembly includes a seal ring having a facing surface of a relatively hard material, such as hardened steel or tungsten carbide, and a second seal ring of... | 10/10/2006 |
| 7073611 | Ion-beam assisted deposition of inorganic coatings for elastomeric seal wear resistance improvement Elastomeric seals for use in drill bits on which an inorganic surface modification material has been deposited onto the surface of the elastomeric seals. Wear resistance of the seal at the dynamic surface is improved by providing support for the soft seal surface, b... | 07/11/2006 |
| 7044242 | Roller cone bits with reduced packing A roller-cone drill bit in which a large groove is machined into the backface of each cone, near the crack where the cone meets the arm assembly. By making the outer lip of this crack more exposed to the open volume of turbulent flow, turbulence near the crack is in... | 05/16/2006 |
| 7036611 | Expandable reamer apparatus for enlarging boreholes while drilling and methods of use An expandable reamer apparatus and methods for reaming a borehole, wherein a laterally movable blade carried by a tubular body may be selectively positioned at an inward position and an expanded position. The laterally movable blade, held inwardly by blade-biasing e... | 05/02/2006 |
| 7013998 | Drill bit having an improved seal and lubrication method using same A drill bit (100) for drilling a wellbore that traverses subterranean formations includes a drill bit body (106) having a plurality of journal pins (112), each having a bearing surface (128), and a rotary cutter (104) rotatably mou... | 03/21/2006 |
| 7000712 | Bearing seal A seal assembly for a shaft supporting a rotary element comprises a sealing ring having an inner radial surface in contact with a seal surface of the shaft. The sealing ring comprising a disc shaped integral radial lip normal to the inner radial surface. A disc shap... | 02/21/2006 |
| 6942220 | Combination metal gasket and seal structure The present invention provides a combination metal gasket that is formed by fitting a ring-shaped metal base elastic structure in at least one trough portion of two trough portions of a ring-shaped metal gasket that has an S-shaped longitudinal cross section. The co... | 09/13/2005 |
| 6935443 | Mini disk bit A small sized disk bit includes a bit holder accommodated in a bearing journal on its side (overhangingly), and a disk body with asymmetrically designed wedge flanks mounted rotatably thereon. To enable the disk body to absorb high radial and axial strong forces enc... | 08/30/2005 |
| 6802380 | Pressure relief system and methods of use and making A roller-cone rock bit in which the compensation reservoir is integrated with a hydrostatically-asymmetric seal, such as a V-seal, which provides pressure relief. This seal not only relieves overpressure during filling, and when the grease thermally expands as the b... | 10/12/2004 |
| 6769500 | Optimized earth boring seal means A rock bit seal in which the shape of the retainer lip (which restrains the seal from axial motion in response to pressure differentials) is optimized, with respect to the as-deformed shape of the seal in place, to achieve a preload stress which is everywhere nonzer... | 08/03/2004 |
| 6684966 | PCD face seal for earth-boring bit An earth-boring bit has a mechanical face seal assembly with PCD faces. The bit has a bearing shaft with a cone rotatably mounted on the bearing shaft. The seal locates between the bearing shaft and the cone for sealing lubricant therein. The seal include... | 02/03/2004 |
| 6679342 | Dual-seal drill bit pressure communication system A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segme... | 01/20/2004 |
| 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 |
| 6536542 | Rock bit seal with multiple dynamic seal surface elements Seals of this invention comprise an annular elastomeric ring-shaped body having a dynamic surface disposed along a first body portion, the dynamic surface comprising at least two surface elements that project outwardly therefrom to provide multiple barrie... | 03/25/2003 |
| 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 |
| 6450270 | Rotary cone bit for cutting removal An improved rotary cone bit includes a threaded end on a bit body for coupling to a drill string. The drill bit body includes two or more leg portions extending from one end thereof. From interval at each of the leg portions is a bearing pin that extends ... | 09/17/2002 |
| 6220374 | Rotary cone drill bit with enhanced thrust bearing flange The present invention allows the load-bearing capabilities of a drill bit thrust flange to be increased. The invention utilizes a thrust flange that is larger than the inside diameter of an associated drill bit journal bushing. The thrust flange may exten... | 04/24/2001 |
| 6196339 | Dual-seal drill bit pressure communication system A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segme... | 03/06/2001 |
| 6176331 | Bearing sealing means of earth boring bits A bearing seal for earth boring bits is disclosed. A supporting ring is located in a groove formed in the earth boring bit. An annular cavity between the outer circumference of the supporting ring and the bottom of the groove is connected with the outside... | 01/23/2001 |
| 6056072 | Lubricating grease A heavy-duty lubricating grease is shown which includes a synthetic fluid base and a thickener system. The heavy-duty grease can be used in both rolling element and journal type rock bit bearings to drill in heavy-duty, high temperature applications, such... | 05/02/2000 |
| 5842531 | Rotary rock bit with infiltrated bearings A rotary rock bit is formed as a rock bit body, a bearing shaft supported by the rock bit body, a rotary cutter adapted to be rotatably mounted on the bearing shaft, and at least one bearing that promotes rotation between the rotary cutter and the bearing... | 12/01/1998 |
| 5794726 | Rotary rock bit with infiltrated bearings A rotary rock bit is formed as a rock bit body, a bearing shaft supported by the rock bit body, a rotary cutter adapted to be rotatably mounted on the bearing shaft, and at least one bearing that promotes rotation between the rotary cutter and the bearing... | 08/18/1998 |
| 5673921 | Slide ring and/or counterring made of two materials A slide ring unit includes a slide ring having first and second opposite axial ends. The slide ring further has a sealing face at the first axial end and a conical circumferential surface for supporting an elastic rolling body thereon. The circumferential... | 10/07/1997 |
| 5577565 | Compact roller cutter A roller cutter assembly for use in hard rock tunneling machines comprises a rectangular saddle having a rectangular recess with V-shaped mounting surfaces. Support plates are secured against these mounting surfaces, and the support plates have a shaft ex... | 11/26/1996 |
