With Bearing Or Seal Details Patents (Class 175/371)
  • Patent number: 6305483
    Abstract: Multi-piece seals of this invention include an annular seal body that is formed from an elastomeric energizing material, and that has a static seal surface along one surface and a contacting surface along another surface. A remaining seal portion in the form of a seal jacket or seal cap is connected to the seal body along the contacting surface to provide a dynamic sealing surface thereto. The seal jacket or cap is formed from a material that is different from the seal body and, more Specifically, from a material that displays improved wear resistance when compared to the seal body. A preferred seal jacket or cap material is a composite construction including a nonelastomeric polymer fabric that is impregnated with an elastomeric material. The seal jacket or cap is configured to connect with the seal body by mechanical attachment means independent of chemical cross-linked bonding. Multi-piece seals of this invention can be formed from two components, e.g.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: October 23, 2001
    Assignee: Smith International, Inc.
    Inventor: Gary R. Portwood
  • Patent number: 6279671
    Abstract: In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure for a given amount of squeeze than other configurations. Chamfers connect the central portion to the sidewalls of the gland, so that after the seal has worn in use, it will ride up onto the chamfers, where additional squeeze to the seal. This allows the seal to operate in a standard regime during the first part of its lifetime and to automatically shift to a more compressed mode as the seal wears.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: August 28, 2001
    Inventors: Amiya K. Panigrahi, Mark P. Blackman, Guy James Lefort
  • Patent number: 6264367
    Abstract: A drill bit for use in an earthen annulus that contains loose particles is connected to a fluid supply source and includes a bit body having at least one journal segment and at least one fluid conduit in fluid communication with the fluid supply source. A roller cone is rotatably mounted upon the journal segment and forms at least one bearing cavity therebetween. Annular primary and secondary seals are disposed between the roller cone and the bit body and between the bearing cavity and the earthen annulus. An air groove is provided around at least a portion of the cone or leg between the primary seal and the earthen annulus. The groove circumscribes less than the entire circumference of the groove or leg, and in preferred embodiments includes an exit port and/or a diversion plug. Both the exit port and the diversion plug help prevent the groove from becoming plugged with debris.
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: July 24, 2001
    Assignee: Smith International, Inc.
    Inventors: Robert H. Slaughter, Jr., Roger Didericksen
  • Patent number: 6260635
    Abstract: The present invention allows the load carrying capability of a drill bit journal bearing or bushing to be increased. The present invention increases the length of the journal bushing by using the ball bearings to retain the journal bushing at a desired location between the journal and the cutter cone assembly. Normally, the journal bushing is retained by a flange formed on the interior surface of the cutter cone assembly. In the present invention, this flange is removed, and the ball bearings are used as a retention device for the journal bushing. With the flange removed, the length of the journal bushing may be increased.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: July 17, 2001
    Assignee: Dresser Industries, Inc.
    Inventor: Micheal B. Crawford
  • Publication number: 20010006124
    Abstract: A pressure compensating assembly for use in roller cone drilling bits of the sealed bearing type. The compensating assembly includes a hollow body arranged to fit into a cavity in the bit connected with the lubrication system of the bit and the hollow body includes a normally open lubricant passageway extending therethrough. A seal encircles the body on one side of the lubricant passageway and is arranged to sealingly engage the bit and an elastomeric, cup-shaped diaphragm is located on the body and has a lip arranged to sealingly engage the bit on the other side of the lubricant passageway. The diaphragm having a protuberance on the side of the diaphragm facing the passageway and sized to enter and close the passageway. The body, seal, and diaphragm being assembled into a unitary cartridge for introduction into the bit as a unit.
    Type: Application
    Filed: February 28, 2001
    Publication date: July 5, 2001
    Inventor: William C. Saxman
  • Patent number: 6250407
    Abstract: A rotary drill bit includes a rotary cutter rotatably mounted on a leg. A radial bearing arrangement and an axial bearing arrangement are provided in an interface between the cutter and the leg. The leg includes a filling opening for enabling cylindrical rolling elements of the radial bearing arrangement to be installed. The cutter includes a radial flange which radially overlaps the radial bearing arrangement to secure the cutter on the leg. The flange, which is disposed axially behind the radial bearing arrangement and axially in front of the filling opening, includes a recess for accommodating the passage of the cylindrical rolling elements. A locking element is disposed in the filling opening for preventing dislodgement of the cylindrical rolling elements. The locking element includes a lip which projects axially forwardly of the radial bearing arrangement. The lip is disposed radially inwardly of the flange and terminates axially behind the radial bearing arrangement.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: June 26, 2001
    Assignee: Sandvik AB
    Inventor: Lennart Karlsson
  • Patent number: 6247545
    Abstract: The present invention is a self adjusting, volume balanced, single energizer rigid face seal for rolling cutter drill bits with floating journal bearings. Volume balancing is accomplished by utilizing a floating static seal between the rigid face seal ring and the bearing shaft. This floating static seal ring is moved axially within a annular groove by the volume pulses caused by the axial play of the cutter when in operation. At one end of the annular groove the geometry of the rigid seal ring and bearing shaft are set such that the seal assembly achieves volume balance when the bearing is running on its OD. If the bearing is running on its OD, the floating static seal will move from where ever it is in the annular groove by the volume pulses until it reaches the balance volume position.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: June 19, 2001
    Assignee: Camco International Inc.
    Inventors: Bruce Hawley Burr, Jeffery E. Daly
  • Patent number: 6213228
    Abstract: A pressure compensating assembly for use in roller cone drilling bits of the sealed bearing type. The compensating assembly includes a hollow body arranged to fit into a cavity in the bit connected with the lubrication system of the bit and the hollow body includes a normally open lubricant passageway extending therethrough. A seal encircles the body on one side of the lubricant passageway and is arranged to sealingly engage the bit and an elastomeric, cup-shaped diaphragm is located on the body and has a lip arranged to sealingly engage the bit on the other side of the lubricant passageway. The diaphragm having a protuberance on the side of the diaphragm facing the passageway and sized to enter and close the passageway. The body, seal, and diaphragm being assembled into a unitary cartridge for introduction into the bit as a unit.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: April 10, 2001
    Assignee: Dresser Industries Inc.
    Inventor: William C. Saxman
  • Patent number: 6209668
    Abstract: An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least one scraper cutting element is secured at least partially to the heel surface of the cutter. The scraper cutting element includes an outermost surface, generally aligned with the gage surface of the cutter, that defines a plow edge or point for shearing engagement with the sidewall of the borehole while redirecting cuttings up the borehole.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: April 3, 2001
    Assignee: Baker Hughes Incorporated
    Inventors: Rudolf Carl Otto Pessier, Don Quy Nguyen, Scott R. Schmidt
  • Patent number: 6196339
    Abstract: 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 segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone and an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole. An annular space is defined between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity. The seals are configured to allow the passage of a fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and a passage for fluid from the borehole to the annular space can be included.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: March 6, 2001
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau, Robert Denton
  • Patent number: 6176330
    Abstract: The invention provides a mechanical face seal for rotary rock bits with a novel coil spring energization system that prevents yielding of the coil springs in extreme torque conditions. Within at least one of the coil springs is a cylindrical pin designed to co-act with the spring such that the combination becomes very stiff in the radial direction as the spring extends beyond a certain amount. This prevents the high torque from yielding the springs. When the spring returns to its normal extension, the pin does not interfere with the axial compression of the spring. This combination allows the coil spring energizers of a rotary rock bit mechanical face seal to survive the occasional extreme torque event.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: January 23, 2001
    Assignee: Camco International Inc.
    Inventor: Bruce Hawley Burr
  • Patent number: 6170582
    Abstract: 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 is disposed between a first slot in the journal and a corresponding second slot in the roller cone. An access hole runs through the journal to the first slot, penetrating the first slot at a location away from the top dead center of the first slot.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: January 9, 2001
    Assignee: Smith International, Inc.
    Inventors: Amardeep Singh, Steve Peterson, Sujian J. Huang
  • Patent number: 6142249
    Abstract: An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base where it joins the bit body. At least one cutter is mounted for rotation on the bearing shaft and has radial and axial surfaces that cooperate with the base of the bearing shaft to define a bearing seal gland. A bearing is defined between the cutter and bearing shaft. A seal element is disposed in the seal gland. A secondary seal is disposed in the seal gland opposite the cutter axial surface and cooperates with the seal element to at least partially seal the gland against entry of debris from the exterior of the bit.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: November 7, 2000
    Assignee: Baker Hughes Incorporated
    Inventors: Anton F. Zahradnik, Eric C. Sullivan, Chih Lin, Terry J. Koltermann, Scott R. Schmidt
  • Patent number: 6131676
    Abstract: Small diameter rotary drill bits using rolling disc cutters. Novel small diameter rotary drill bits with detachable pedestal mounted rolling disc cutters are provided. The bit body has a plurality of longitudinal edge mounting slots located at preselected angularly spaced apart locations. Preferably, the slots each have an upper protective ledge and downwardly extending sidewalls. A set of peripheral pedestal mounts each having a mounting portion sized and shaped to fit into a preselected mounting slot are provided and each is detachably mounted in its preselected mounting slot. In one embodiment, the longitudinally extending slots further comprise a wedge shaped edge portion, and the pedestal mounts have a complimentary angularly shaped portion, so that when the pedestal mount is brought into a close fitting relationship with the longitudinal slot, the pedestal mount and the longitudinal slot are tightly and securely interfitting.
    Type: Grant
    Filed: October 5, 1998
    Date of Patent: October 17, 2000
    Assignee: Excavation Engineering Associates, Inc.
    Inventors: James E. Friant, Michael A. Anderson
  • Patent number: 6116360
    Abstract: A rotary drill bit is manufactured by a method including the step of forming at least a portion of the bit body from a precipitation hardening alloy, and brazing cutters to the bit body by a heating and cooling cycle during which the bit body is first heated to a temperature sufficient to melt the brazing material and is then cooled to room temperature, the heating and cooling brazing cycle being controlled in a manner so as also to effect precipitation hardening of the alloy from which the bit body is formed. In the case where the bit body is formed from solid infiltrated matrix material around a solid preformed mandrel, the heating and cooling cycle of the matrix forming process may also be controlled in a manner to effect precipitation hardening of the alloy from which the mandrel is formed.
    Type: Grant
    Filed: July 1, 1998
    Date of Patent: September 12, 2000
    Assignee: Camco International (UK) Limited
    Inventor: Stephen Martin Evans
  • Patent number: 6109376
    Abstract: A mechanical seal for rotary rock bits with a uniquely formed hydrodynamic wave geometry on the sealing faces. The sealing faces are first manufactured flat and smooth, then upon assembly are elastically deformed into a hydrodynamic geometry by an energizing system. After a smooth flat sealing surface is formed, the mechanical seal face elastically deforms into a hydrodynamic wave geometry. The typical deformation has a magnitude greater than about three helium light bands more than the original surface. The region of the sealing surface at the outer periphery of the seal does not have a wave geometry. Rather the portion of the seal face at the periphery is flat and parallel to its mating seal ring to exclude abrasives and eliminate lubricant leakage.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: August 29, 2000
    Assignee: Camco International Inc.
    Inventor: David E. Pearce
  • Patent number: 6092611
    Abstract: A relief valve for use in roller cone drilling bits of the sealed bearing type and other types of sealed fluid systems. The relief valve includes a valve body arranged to fit into the lubricating system of the bit and an elastomeric valve member having a flow port therein that is normally closed. The valve member includes a flexible lip defining the port that is arranged to permit flow in one direction through the port to relieve pressure above a predetermined value while preventing flow therethrough in the opposite direction.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: July 25, 2000
    Assignee: Dresser Industries, Inc.
    Inventor: William C. Saxman
  • Patent number: 6056072
    Abstract: 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 as in the bearing structures of rock bits used to drill hot subterranean formations.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: May 2, 2000
    Assignee: Baker Hughes Inc.
    Inventors: Terry J. Koltermann, Thomas F. Willey
  • Patent number: 6053264
    Abstract: A mounting for cutter wheels on rotary rock drill bits includes a spindle with two annular axial load bearing surfaces, one of which interfaces in a rotational relationship with a cylindrical segmented bushing affixed to the inside surface of a cavity in the cutter wheel and the other of which interfaces through a top hat bushing flange in a rotational relationship with an annular end bearing surface in the cavity of the cutting wheel. A compressive silver coating on the cylindrical bushing before it is split, leaving uncoated edges for precise registration and bit onto a cylindrical race surface machined into the spindle, provides lubrication in addition to compressing under load to distribute axial loading forces from the cutter wheel in proportion to the two axial load bearing surfaces on the spindle.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: April 25, 2000
    Assignee: Sunrise Enterprises, LLC
    Inventors: Kenneth A. Frankel, Thomas E. Carson
  • Patent number: 6033117
    Abstract: A sealed-bearing drill bit for use in an earthen annulus is provided having a dual seal arrangement. The drill bit includes at least one leg having a journal segment, and a roller cone mounted upon the journal segment and forming at least one bearing cavity therebetween. An annular primary seal is disposed between the leg and roller cone and between the bearing cavity and the earthen annulus. An annular secondary seal is disposed between the annular primary seal and the earthen annulus and is capable of substantially preventing the ingress of debris from the earthen annulus to the annular primary seal.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: March 7, 2000
    Assignee: Smith International, Inc.
    Inventors: Peter Cariveau, Robert H. Slaughter, Jr., Roger Didericksen, Chris Edward Cawthorne, Gary Ray Portwood
  • Patent number: 6026917
    Abstract: An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base where it joins the bit body. At least one cutter is mounted for rotation on the bearing shaft and has radial and axial surfaces that cooperate with the base of the bearing shaft to define a bearing seal gland. A bearing is defined between the cutter and bearing shaft. A seal element is disposed in the seal gland. A secondary seal is disposed in the seal gland opposite the cutter axial surface and cooperates with the seal element to at least partially seal the gland against entry of debris from the exterior of the bit.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: February 22, 2000
    Assignee: Baker Hughes Incorporated
    Inventors: Anton F. Zahradnik, Eric C. Sullivan, Chih Lin, Terry J. Koltermann, Scott R. Schmidt
  • Patent number: 5944126
    Abstract: A rock drill bit includes at least one leg about which a roller cutter is rotatably mounted. A ring-shaped seal is disposed between an end surface of the leg and a sealing surface of the roller cutter. The seal is arranged coaxially with respect to an axis of rotation of the roller cutter and is formed of an elastic material and a relatively rigid material embedded within the elastic material. The elastic material defines first and second surfaces which engage the leg and the roller cutter, respectively. Either the leg or the seal includes circumferentially spaced recesses which receive respective projections formed in the other of the leg and the seal, for locking the seal to the leg against rotation relative thereto.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: August 31, 1999
    Assignee: Sandvik AB
    Inventor: Stig-.ANG.ke Brolund
  • Patent number: 5944125
    Abstract: 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 extending from the base pin along a longitudinal axis of the support spindle. A conical-shaped thrust face forms the transition from the base pin to the pilot pin. A cutting cone is rotatably mounted on each support spindle and includes a conical internal surface to run in contact with the conical thrust face of the support spindle. Rotation of the cutting cone carries lubricant from the non-load side of the spindle to the contact surfaces on the load side of the spindle.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: August 31, 1999
    Assignee: Varel International, Inc.
    Inventor: Chris S. Byrd
  • Patent number: 5931241
    Abstract: 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 thrust bearing configured to carry onward thrust loads from the cutter onto the spindle. A bearing seal defines an enclosed region between the cutter and the spindle in which the bearings are located, and a pressure balanced lubricant delivery system within the spindle delivers lubricant to the bearings. The lubricant delivery system includes a non-return valve to allow lubricant to flow into the area of the enclosed region containing the thrust bearing and the area is bounded by a tortuous flow path which allows a more restricted flow of lubricant out of the thrust bearing area and into another area of the enclosed region, without pressurizing the bearing seal.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: August 3, 1999
    Assignee: Camco International Inc.
    Inventor: Jeffery E. Daly
  • Patent number: 5904211
    Abstract: An improved disc type rolling rock cutter, and novel cutterheads employing such cutters. A rock cutter with an improved, simplified structure, with compact bearing, and smooth, rounded blade shape is disclosed. The design incorporates a cutter ring, bearing assembly, and seal assembly. The cutter may be assembled and disassembled for rework by a single worker with simple hand tools. Replacement of worn out cutter rings is done quickly and easily by removing the old ring assembly and then sliding a new ring, bearing, and seal assembly on to the cutter shaft. This simplified assembly is achieved by using a comparatively large shaft which is normally in the range of 30-50% of the ring diameter. The shaft design is sufficiently robust to permit a cantilever mount of the cutter. The unique configuration allows 30,000 lbs. or more thrust to be applied to a 5 inch diameter miniature disc. This capacity permits single disc cutter technology to be applied to smaller bits or cutterheads than previously possible.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: May 18, 1999
    Assignee: Excavation Engineering Associates, Inc.
    Inventors: James E. Friant, Levent Ozdemir
  • Patent number: 5887981
    Abstract: A drill bit for use in an earthen annulus that contains loose particles is connected to a fluid supply source and includes a bit body having at least one journal segment and at least one fluid conduit in fluid communication with the fluid supply source. A roller cone is rotatably mounted upon the journal segment and forms at least one bearing cavity therebetween. An annular primary seal is disposed between the roller cone and the bit body and between the bearing cavity and the earthen annulus, and an annular gap is disposed between the annular primary seal and the earthen annulus. The annular gap is in fluid communication with the fluid conduit and the earthen annulus. An annular secondary seal is disposed between the annular primary seal and the earthen annulus and is capable of substantially preventing the ingress of debris from the earthen annulus to the annular primary seal.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: March 30, 1999
    Assignee: Smith International, Inc.
    Inventors: Robert H. Slaughter, Jr., Peter Cariveau, Roger Didericksen
  • Patent number: 5875861
    Abstract: A rolling cutter drill bit has at least one roller cutter mounted on a cantilevered bearing shaft with a sealed bearing and lubrication system, lubricant pressure balancing means, lubricant pressure relief means, and a volume compensating rigid face seal assembly axially movable through an operating range. The face seal assembly comprises two cooperating face seal rings, one ring mounted on the bearing shaft and the other ring mounted in the cutter; a first energizer for the seal ring mounted on the bearing shaft, having a stiffness K1; and a second energizer for the seal ring mounted in the cutter, having a stiffness K2. In order to minimize the variation in the sealing face force as the assembly moves through its operating range, the stiffness K2 is less than half, and preferably less than 0.2, of the stiffness K1.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: March 2, 1999
    Assignee: Camco International Inc.
    Inventors: Jeffery E. Daly, David E. Pearce, Thomas A. Wick
  • Patent number: 5853245
    Abstract: 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 otherwise located precisely with respect to the other bearing elements within the drill bit to effectively control the axial displacement of the rolling cutter on the bearing spindle within a given tolerance range. Upon assembly, the difference in thread pitch causes the opposite, opposing mating thread flanks to engage, effectively applying a tensile or compressive force to a portion of the threaded ring bearing member, which gradually increases as the assembly is tightened. The result is an improved rolling cutter drill bit with a threaded ring cutter bearing system with excellent resistance to back-off which will not allow significant radial movement between the engaged threads, even if some back-off of the threads occurs.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: December 29, 1998
    Assignee: Camco International Inc.
    Inventor: Randall R. Price
  • Patent number: 5839523
    Abstract: A rotary cutter includes a shaft adapted to be mounted on a support and defining a longitudinal axis. The shaft includes a bore extending inwardly into the shaft, and a channel extending into the shaft and intersecting the bore. A roller body, having cutting elements, is mounted on the shaft for rotation relative thereto about the axis. Bearings are disposed between the roller body and the shaft, the bearings communicating with the bore. The cutter is lubricated by inserting a filling plug into the bore and forcing lubricant therethrough and into the bearings. The filling plug is then removed from the bore, leaving the bore generally free of lubricant. A hollow cylindrical member and a flexible diaphragm are inserted into the bore, and a nozzle is inserted through the channel for introducing lubricant into the bore. The nozzle is then removed from the channel, and the channel is plugged. The diaphragm flexes inwardly and outwardly in response to variations in external and internal pressures.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: November 24, 1998
    Assignee: Sandvik AB
    Inventor: Stig-.ANG.ke Brolund
  • Patent number: 5819861
    Abstract: An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least one scraper cutting element is secured at least partially to the heel surface of the cutter. The scraper cutting element includes an outermost surface, generally aligned with the gage surface of the cutter, that defines a plow edge or point for shearing engagement with the sidewall of the borehole while redirecting cuttings up the borehole.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: October 13, 1998
    Assignee: Baker Hughes Incorporated
    Inventors: Danny Eugene Scott, Rudolf Carl Otto Pessier
  • Patent number: 5794726
    Abstract: 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 shaft. Each bearing includes a bearing element having a steel matrix with steel-free volumes distributed therethrough. The matrix is a hypoeutectoid steel having more than about 0.40 weight percent carbon. An anti-galling alloy resides within the steel-free volumes of the steel matrix. The anti-galling alloy is a silver-copper alloy having a composition of from about 85 weight percent to about 95 weight percent silver, balance copper.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: August 18, 1998
    Assignee: Dresser Indistries
    Inventor: Kenneth O. McDowell
  • Patent number: 5791421
    Abstract: An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the bearing shaft. A seal assembly is disposed between the cylindrical journal bearing surface and the cutter proximally to the base of the cantilevered bearing shaft. The seal assembly includes at least one rigid seal ring having a seal face in contact with a second seal face. A selected one of the seal faces is at least partially formed of a hard ceramic type material with the other seal face being formed of a relatively softer material to provide improved wear resistance for the seal assembly.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: August 11, 1998
    Assignee: Baker Hughes Incorporated
    Inventor: Chih Lin
  • Patent number: 5740871
    Abstract: A rotary cone drill bit for forming a borehole having a bit body with an upper end portion adapted for connection to a drill string. A number of angularly-spaced support arms formed to extend from the bit body. Each support arm has an inside surface with a spindle connected thereto and an outer surface. A number of cutter cones equal to a number of support arms are rotatably mounted on respective spindles. Each of the cutter cones includes an integral cylindrical cavity for receiving the respective spindle. A gap with a generally cylindrical portion is formed between the spindle and the cavity with a seal element disposed within the gap. The gap has an opening contiguous with the bottom edge of the outer surface and extending outwardly from the spindle. A bearing element is disposed within each gap between the exterior of the respective spindle and the interior of the respective cavity. A seal element is disposed within each gap to seal between the respective spindle and the interior of the respective cavity.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: April 21, 1998
    Assignee: Dresser Industries, Inc.
    Inventor: Mark E. Williams
  • Patent number: 5673921
    Abstract: 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 surface tapers from the sealing face toward the second axial end. The slide ring unit further has a stop for axially retaining the rolling body on the circumferential surface of the slide ring. The stop forms a component separate from the slide ring and adjoins the slide ring at the second axial end thereof. The stop has an outer circumferential surface terminating at and flush with the conical circumferential surface of the slide ring at the second axial end thereof. Further, a securing arrangement is provided for attaching the stop to the slide ring.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: October 7, 1997
    Assignee: AE Goetze GmbH
    Inventor: Hans-Henning Zutz
  • Patent number: 5668092
    Abstract: A rock bit for drilling subterranean formations is lubricated with a grease composition made from a high-viscosity synthetic lubricant basestock and a combination of lubricant additives. The grease composition preferably has in the range of from 1 to 20 percent by weight polyisobutylene, in the range of from 50 to 90 percent by weight ethylene-alphaolefin, up to approximately 40 percent by weight polyalphaolefin, and in the range of from 4 to 45 percent by weight lubricant additives. The rock bit grease composition has a viscosity index in the range of from about 250 to 325, and has an absolute viscosity of greater than about 100,000 centipoise at a temperature of approximately 70.degree. F. and at a shear rate of less than about 40 seconds.sup.-1, without the use of solid metal-containing extreme pressure agents or thickening agents.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: September 16, 1997
    Assignee: Smith International, Inc.
    Inventor: Robert M. Denton
  • Patent number: 5655611
    Abstract: An earth-boring bit has a bit body and at least one bearing shaft depending inwardly and downwardly from the bit body. The bearing shaft has a base and a generally cylindrical bearing surface and at least one cutter is mounted for rotation on the bearing shaft. A bearing seal recess is formed generally at the base of the bearing shaft and defines a cylindrical seal face radially recessed from the journal bearing surface. A cutter seal recess is formed in the cutter generally opposite the bearing seal recess and defines a bearing cylindrical seal face. The cutter and bearing seal recesses define a seal gland including a pair of opposed radial seal surfaces. A resilient seal ring is disposed in the seal gland and compressed between the cylindrical seal faces.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: August 12, 1997
    Assignee: Baker Hughes Inc.
    Inventors: George E. Dolezal, Thomas M. Harris
  • Patent number: 5644956
    Abstract: 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 formed with the body and depend therefrom. Each arm has an inside surface with a spindle connected thereto and an outer shirttail surface. Each spindle projects generally downwardly and inwardly with respect to its associated arm, has a generally cylindrical upper end portion connected to the associated inside surface, and has an inner sealing surface on the upper end portion. A number of rotary cone cutters equal to the number of arms are each mounted on respective spindles.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: July 8, 1997
    Assignee: Dresser Industries, Inc.
    Inventors: Mark Philip Blackman, Jay Stuart Bird, Michael Steve Beaton
  • Patent number: 5642942
    Abstract: A radially disposed thrust bearing assembly for air cooled and lubricated mining type rotary cone rock bits consists of a first non-rotating radially disposed steel thrust bearing disc and an apposed, non-rotating carbide thrust bearing disc. One of the thrust bearing discs is pressed into a disc retention socket formed in the end of a spindle bearing extending from the end of a main axially aligned bearing cantilevered from a leg of the bit and the other thrust bearing disc is pressed into a disc retention socket formed in the rotary cone. An edge of the carbide disc is formed with large valleys and peaks, the robust undulations resist cracking when the carbide thrust bearing disc is pressed into its respective socket. Unique air passages and channels are formed in the main and spindle bearings to direct cooling air to the apposed thrust bearing discs.
    Type: Grant
    Filed: March 26, 1996
    Date of Patent: July 1, 1997
    Assignee: Smith International, Inc.
    Inventor: Robert Wagoner
  • Patent number: 5628375
    Abstract: 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 thrust bearing configured to carry onward thrust loads from the cutter onto the spindle. A bearing seal defines an enclosed region between the cutter and the spindle in which the bearings are located, and a pressure balanced lubricant delivery system within the spindle delivers lubricant to the bearings. The lubricant delivery system includes a non-return valve to allow lubricant to flow into the area of the enclosed region containing the thrust bearing and the area is bounded by a tortuous flow path which allows a more restricted flow of lubricant out of the thrust bearing area and into another area of the enclosed region, without pressurizing the bearing seal.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: May 13, 1997
    Assignee: Camco International Inc.
    Inventor: Jeffery E. Daly
  • Patent number: 5586611
    Abstract: A rotary cutter cone type drill bit having a body structure with a plurality of depending cutter support lugs each having a spindle integral therewith and defining a cylindrical bushing support surface and a spindle head. A cutter cone is positioned for rotation about each of the spindles and is supported for rotation and axial retention by a dual split bushing arrangement. The dual split bushing arrangement has an inner split bushing received in immovable relation about the cylindrical bushing support surface of the spindle and outer split bushing being received in rotatable bearing relation about a portion of the inner split bushing and functioning to retain the inner split bushing about the cylindrical bushing support surface. The inner split bushing also retains the outer split bushing so that the cutter cone is maintained in assembly with the spindle. The outer split bushing is secured in immovable relation within the cutter cone by a lock element or by threaded connection.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: December 24, 1996
    Assignee: Cypress Services, Inc.
    Inventor: Daniel E. D. Dorosz
  • Patent number: 5570750
    Abstract: A rotary cone drill bit for forming a borehole having a bit body with an upper end portion adapted for connection to a drill string. A number of angularly-spaced support arms formed to extend from the bit body. Each support arm has an inside surface with a spindle connected thereto and an outer shirttail surface. A number of cutter cones equal to the number of support arms are rotatably mounted on respective spindles. Each of the cutter cones includes an internal cylindrical cavity for receiving the respective spindle. A gap with a generally cylindrical portion is formed between the spindle and the cavity with a seal element disposed within the gap. The gap has an opening contiguous with the bottom edge of the shirttail surface and extending outwardly from the spindle. A shirttail ring is disposed on the exterior of each spindle between the cutter cone and the inside surface of the respective support arm with a portion of the shirttail ring extending from the respective shirttail surface.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: November 5, 1996
    Assignee: Dresser Industries, Inc.
    Inventor: Mark E. Williams
  • Patent number: 5542485
    Abstract: An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a cutter shell surface including a gage surface and a heel surface. A plurality of cutting elements inserts are arranged in generally circumferential rows on the cutter. At least one chisel-shaped cutting element is secured to the gage surface. The chisel-shaped cutting element has a pair of surfaces converging to define a circumferential crest and is tilted toward the heel surface such that a line drawn through the center of the cutting element and its crest defines an acute angle of between about 15 and 75 degrees with the gage surface of the cutter.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: August 6, 1996
    Assignee: Baker Hughes Incorporated
    Inventors: Rudolf C. O. Pessier, Danny E. Scott, Robert E. Grimes, Matthew R. Isbell
  • Patent number: 5524718
    Abstract: An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the bearing shaft. A seal assembly is disposed between the cylindrical journal bearing surface and the cutter proximally to the base of the cantilevered bearing shaft. The seal assembly includes at least one resilient sealing ring which is formed of a carboxylated hydrogenated acrylonitrile butadiene rubber.
    Type: Grant
    Filed: January 31, 1995
    Date of Patent: June 11, 1996
    Assignee: Baker Hughes Incorporated
    Inventors: Philip B. Kirk, George E. Dolezal, Ronald R. Campbell
  • Patent number: 5518077
    Abstract: 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 formed with the body and depend therefrom. Each arm has an inside surface with a spindle connected thereto and an outer shirttail surface. Each spindle projects generally downwardly and inwardly with respect to the central axis, has a generally cylindrical upper end portion connected to the inside surface, and has an inner sealing surface within the upper end portion. A number of rotary cone cutters equal to the number of arms are each mounted on one of the spindles.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: May 21, 1996
    Assignee: Dresser Industries, Inc.
    Inventors: Mark P. Blackman, Jay S. Bird, Michael S. Beaton
  • Patent number: 5513711
    Abstract: A rotary cone drill bit (10) for forming a borehole includes a support arm-cutter assembly (26). A support arm (28) is integrally formed with the drill bit's body (22) with a spindle (30) machined integral thereto. The assembly (26) includes a cutter (12) with a cavity (34) for receiving the spindle (30). An inner seal gland (44) is formed between the spindle (30) and a wall (42) of the cavity (34). An elastomeric seal (46) is disposed in the inner seal gland (44) to form a first fluid barrier between. An outer seal gland (50) is formed between the spindle (30) and the cavity wall (42) and between the inner seal gland (44) and the borehole. A ring (56) is disposed in the outer seal gland (50) to rotate with the cutter (12). The ring (56) has a peripheral hole (58) therethrough. A gas conduit (60) is disposed within the support arm (28) for directing a flow of a gas, such as air, into the outer seal gland (50).
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: May 7, 1996
    Inventor: Mark E. Williams
  • Patent number: 5513715
    Abstract: A flat seal (32) for a roller cone rock bit (10) is provided. Flat seal (32) includes a ring-shaped metallic spring (80). Metallic spring (80) has an inner face (88) with an annular inner edge (92) for contacting a sealing surface (72) of a cone (18) in a roller cone rock bit (10). Metallic spring (80) also has outer face (86) with an annular outer edge (90) for contacting a sealing surface (70) of a spindle (16) in the roller cone rock bit (10). Metallic spring (80) has a relaxed axial pitch greater than a clearance (76) between sealing surfaces (70) and (72) of cone (18) and spindle (16). Flat seal (32) also includes an annular inner elastomer shroud (84) disposed on inner face (88) of metallic spring (80) such that the annular inner edge (92) is exposed. Flat seal (32) further includes an annular outer elastomer shroud (82) disposed on outer face (86) of metallic spring (80) such that the annular outer edge (90) is exposed.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: May 7, 1996
    Assignee: Dresser Industries, Inc.
    Inventor: Theodore R. Dysart
  • Patent number: 5507355
    Abstract: The present invention refers to a cutter (10;10') of a boring head, said cutter (10;10') being rotatably mounted, via a shaft (11;11') of the cutter, in a saddle secured to the boring head, a roller bearing means being located between the shaft (11;11') and a hub (18;18'), means (23;23'a,23'b) for axially locking the roller bearing means relative to the shaft (11;11') and sealing arrangements between the hub (18;18') and the locking means (23;23'a,23'b), said roller bearing means including at least one inner race (12;12'a,12'b) that is mounted on the shaft (11;11') and a set of tapered rollers (15;15'a,15'b) mounted in an outer circumferential recess (13;13'a,13'b) of the inner race (12;12'a,12'b), said hub (18;18') being rotatable relative to the shaft (11;11') via said roller bearing means, said rotatable hub (18;18') carrying rock working means (20;20'). The invention also refers to a hub (18;18') per se and a method of manufacturing a hub (18;18').
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: April 16, 1996
    Assignee: Sandvik AB
    Inventor: Michael Mattsson
  • Patent number: 5485891
    Abstract: A cone drill bit includes legs and attached to them trunnions with cones mounted thereon. A support unit for mounting the cones upon the trunnions includes a strengthened radial thrust ball bearing which transmits a load directed along a cone centerline. Strengthening the ball bearing in order to increase a bit wear resistance is attained by using the balls which diameter is appropriately related to the bit diameter as well as by strengthening a shoulder on the trunnion between the ball and peripheral roller bearings.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: January 23, 1996
    Assignee: Obshestvo S Organichennoi Otvetstvennostju "Nauchino-Proizvodstvennaya Firma Spettsstroyservis"
    Inventors: Brazhentsev A. Vladimirovich, Brazhentsev V. Pavlovich
  • Patent number: 5472058
    Abstract: A mechanical seal for use in a rotary rock bit comprises a leg seal ring positioned within a recessed portion of a leg forming a seal cavity. The leg seal comprises one surface partially engaged by a resilient material and an opposite surface comprising a first sealing surface. The mechanical seal also comprises cone seal ring positioned within a portion of a cone forming the seal cavity. The cone seal comprises one surface positioned within and attached to a recessed portion of the cone and another surface comprising a second sealing surface engaging the first sealing surface. The portion of the leg seal ring engaged by the resilient material engages a back face of the leg which includes a ramp, serving to urge the first sealing surface against the adjacent second sealing surface and create a sealing engagement.
    Type: Grant
    Filed: April 20, 1994
    Date of Patent: December 5, 1995
    Assignee: Smith International, Inc.
    Inventors: Michael E. Hooper, Dah-Ben Liang, Madapusi K. Keshavan
  • Patent number: 5465800
    Abstract: A method of manufacturing a rolling cutter drill bit comprising a bit body which carries cutter assemblies each of which includes a cutter journal on the bit body, a cutter rotatably mounted on the journal, and a threaded retention ring screwed onto the cutter to retain the cutter on the journal while permitting a limited degree of axial displacement of the cutter relative to the journal. The method comprises the steps of predetermining a desired magnitude of maximum permitted axial displacement between the cutter and the journal, and then employing components for the cutter assembly which are so dimensioned as to provide, when assembled to form the cutter assembly, a maximum permitted axial displacement which is not greater than the predetermined magnitude. The appropriately dimensioned components may be specifically manufactured to the required size, or may be selected from a stock of components of differing sizes.
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: November 14, 1995
    Assignee: Camco International Inc.
    Inventors: David E. Pearce, Thomas A. Wick