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| Number | Title | Issue Date |
| 7387178 | Self relieving seal Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal... | 06/17/2008 |
| 7267186 | Magnetic face seal for rock drill bit bearings A seal assembly for an earth boring bit uses a magnet to provide a desired contact force. The seal is located between a rotating cone and a stationary bearing pin of the drill bit. The seal has a non rotating metal face that is in sliding engagement with a seal face... | 09/11/2007 |
| 7201241 | Self relieving seal Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal... | 04/10/2007 |
| 6976548 | Self relieving seal Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal... | 12/20/2005 |
| 6820704 | Rock bit seal with extrusion prevention member Annular seals of this invention comprise an elastomeric seal body that is configured to fit within a seal gland of a rock bit. The seal comprises a first seal surface, for providing a seal along a dynamic rotary surface formed between the seal body and one portion o... | 11/23/2004 |
| 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 |
| 6401843 | Drilling head with a cone rock bit A drilling head with a cone rock bit, each cone having a stationary part and a rotary part which rotates about an axis of rotation. Also included is a dynamic sealing device between the stationary part and the rotary part. The sealing device is borne by t... | 06/11/2002 |
| 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 |
| 5148879 | Spindle cap bearing for rotary cone rock bits This invention consists of a floating spindle cap disposed between a spindle pilot bearing extending from a main journal bearing and a cone bore formed by a rotary rock bit cone secured to the journal bearing. The floating spindle cap is formed from a sof... | 09/22/1992 |
| 5016719 | Rotary cone type rock bits An earth boring bit of the type having three rotary cone cutters carried on bearing pins depending from respective head sections is disclosed. Adjacent the rear face of a cutter is located a portion of the respective head section commonly known as the shi... | 05/21/1991 |
| 4895215 | Seal cage assembly for relatively movable members A rotatable seal cage assembly for positioning between relatively movable members including a ring with inner and outer circumferential edges, which edges are joined by two flat side surfaces extending therebetween. An annular projecting surface extends f... | 01/23/1990 |
| 4825964 | Arrangement for reducing seal damage between rotatable and stationary members A sealing relationship between a rotatable and stationary member is formed by a seal arrangement between the rotatable and stationary member wherein a first member engages the seals forming the sealing relationship and a second member is rotatable by the ... | 05/02/1989 |
| 4756631 | Diamond bearing for high-speed drag bits A bearing for a rotary cone for a rock bit is disclosed. The bearing consists of a multiplicity of small synthetic diamond particles nested within a matrix base, each with an exposed flattened surface to form the bearing. The diamond particles are strateg... | 07/12/1988 |
| 4753303 | Earth boring bit with two piece bearing and rigid face seal assembly An earth boring bit having a cantilevered bearing shaft and a compensator system to equalize the pressure of the lubricant with the hydrostatic pressure of the drilling fluid surrounding the bit. A rigid face seal assembly, positioned between the cutter a... | 06/28/1988 |
| 4613005 | Unitized seal for severe service applications The present invention is directed to a grit exclusion and oil retention seal for use in extremely hostile environments. These environments include, but are not limited to sealing oil within cavities forming parts of earth drilling bits and the like. Seals... | 09/23/1986 |
| 4306727 | Dynamic seal for rolling cutter drill bit A dynamic seal is disclosed for sealing between a rotating cutter and a drill bit journal in an underground formation drilling bit, which seal utilizes a static elastomeric seal ring abutting a metal seal ring having a dynamic sealing face.... | 12/22/1981 |
| 3964554 | Temperature-regulated, sealed bearing system for rock drill bits An invention relating to a rock drill bit assembly primarily adapted for earth boring operations, and more particularly to a rock drill bit assembly having therewithin a temperature-controlled, sealed environ being adapted for the bearing means and the lu... | 06/22/1976 |
