Nonsymmetrical Bit Patents (Class 175/398)
  • Publication number: 20040099448
    Abstract: An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further said pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.
    Type: Application
    Filed: November 21, 2002
    Publication date: May 27, 2004
    Inventors: Coy M. Fielder, Rogerio H. Silva
  • Publication number: 20040079554
    Abstract: A cup-shaped drill head with an inner conical surface (2) for force-locking connection with an exterior conical surface (3) of a driving drill shaft (4), which at the leading end changes over into a cup base (5) with a center point (P), whereby in the change over from the cup base (5) to the inner conical surface (2) a lesser curvature (K) is present than at the center point (P).
    Type: Application
    Filed: October 15, 2003
    Publication date: April 29, 2004
    Inventors: Udo Hauptmann, Peter Sternberger, Reinhard Schulz, Martin Richter
  • Publication number: 20040069533
    Abstract: The invention relates to a method for horizontal ground-boring, in particular for rock-boring, by means of a rotating and hammering driven ground-boring device, whereby the device is alternately or simultaneously supplied with compressed air and drilling medium and the compressed air and drilling medium are supplied through a channel.
    Type: Application
    Filed: October 7, 2003
    Publication date: April 15, 2004
    Inventor: Franz-Josef Puttmann
  • Patent number: 6695080
    Abstract: A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus. The reaming apparatus also provides enhanced protection from contact with the casing wall for selected structural features and elements thereof.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: February 24, 2004
    Assignee: Baker Hughes Incorporated
    Inventors: W. Gregory Presley, Christopher S. Charles, Steven R. Radford, Matthew J. Meiners, Mark E. Morris, D. Jay Clinkscales, Jeffrey B. Lund, Robert A. Laing, Matthew D. Mumma
  • Patent number: 6634444
    Abstract: A drill bit for trenchless drilling includes a bit body defining a longitudinal axis about which the drill bit is rotated during a trenchless drilling operation. Two sets of cutting teeth are mounted at a front end of the bit body, the sets disposed on opposite sides of the axis. The first and second sets are brazed into respective slots formed in the first and second side surfaces of the bit body. The slots on each side surface communicate with a common groove, wherein the groove forms a shoulder against which rear ends of the cutting teeth abut.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: October 21, 2003
    Assignee: Sandvik Rock Tools, Inc.
    Inventors: Gary A. Fuller, Kenneth Monyak, Thomas J. Maechler
  • Publication number: 20030150650
    Abstract: A steerable horizontal subterranean drill bit apparatus is disclosed. The apparatus may include a drill bit and a housing. The drill bit may include an offset drilling fluid seal.
    Type: Application
    Filed: July 31, 2002
    Publication date: August 14, 2003
    Inventor: John B. Sved
  • Publication number: 20030150652
    Abstract: A steerable horizontal subterranean drill bit apparatus is disclosed. The apparatus may include a drill bit and a housing. The drill bit may include elevated wear protector receptacles in particular locations and configurations.
    Type: Application
    Filed: July 31, 2002
    Publication date: August 14, 2003
    Inventor: John B. Sved
  • Publication number: 20030150651
    Abstract: A steerable horizontal subterranean drill bit apparatus is disclosed. The apparatus may include a drill bit and a housing. The drill bit may include offset cutting tooth paths.
    Type: Application
    Filed: July 31, 2002
    Publication date: August 14, 2003
    Inventor: John B. Sved
  • Publication number: 20030150649
    Abstract: A steerable horizontal subterranean drill bit apparatus is disclosed. The apparatus may include a drill bit and a housing. The drill bit may include a one-bolt attachment system.
    Type: Application
    Filed: July 31, 2002
    Publication date: August 14, 2003
    Inventor: John B. Sved
  • Publication number: 20030131992
    Abstract: A sonde (transmitter) housing having a one-piece design for improved housing rigidity. The housing includes a mechanically-adjustable mounting configuration adaptable to a variety of sonde applications. A method of making the sonde housing in a one-piece design and infinitely orienting the sonde clocking electronics.
    Type: Application
    Filed: January 14, 2002
    Publication date: July 17, 2003
    Inventors: Tod Michael, Ric Smith, Mark Facile
  • Patent number: 6588515
    Abstract: The invention provides a rock drilling bit with a plurality of cutting teeth raked into the cut of the drilling bit. Such teeth are oriented at an angle of at least about 30 degrees relative to an imaginary line normal to a front surface of the cutting head from which the cutting teeth project. Such an arrangement provides the desired shear cutting force against the rock face while simultaneously reducing the shock and vibration applied to sonde housing and the drill string. The bit according to the invention may further incorporate a rear, frustoconical crushing surface that defines a space or zone crescent-shaped in cross-section that narrows from front to rear, and an improved replacable tooth for use on a rock drilling bit.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: July 8, 2003
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6588520
    Abstract: A rock drill has at least one hard material insert (2) with at least two cutting edges (3, 7) consisting of hard material and extending radially to the drill axis (A), whereby, in a radial range of 20% to 50% of their drilling radius, at least two cutting edges (3, 7) each have an axial recess (4), and the cutting edges (3, 7) rotating around the drill axis (A) extend with their cutting edges in their entirety without any gaps over the entire drilling radius.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: July 8, 2003
    Assignee: Hilti Aktiengesellschaft
    Inventor: Udo Hauptmann
  • Publication number: 20030106721
    Abstract: A method for optimizing drilling performance of a roller cone drill bit is disclosed. The method includes simulating drilling with the bit in a selected earth formation to determine at least one drilling performance parameter. The orientation of at least one non-axisymmetric cutting element on the bit is adjusted and the simulating the drilling and determining the at least one performance parameter are repeated. The adjusting and simulating the drilling are repeated until the at least one performance parameter is determined to be at an optimum value. In one embodiment, the performance parameter includes rate of penetration.
    Type: Application
    Filed: January 28, 2003
    Publication date: June 12, 2003
    Inventors: Amardeep Singh, Sujian Huang, Scott McDonough
  • Publication number: 20030089527
    Abstract: An apparatus (1) for the directional drilling of a bore hole through a solid substrate includes a main bore head (2) mounted for rotation on a flexible drive shaft (10) and a pilot bore head (4) for weakening a region of substrate in advance of the main bore head, the weakened region being eccentrically located relative to the main bore head. The apparatus further includes means for enabling the drilling access of the main bore head, during subsequent drilling of the bore hole, to become substantially aligned with the weakened region of substrate by using a cam (12).
    Type: Application
    Filed: October 4, 2002
    Publication date: May 15, 2003
    Inventor: William George Edscer
  • Publication number: 20030079917
    Abstract: Asymmetrical compacts are utilized in certain places on roller cones of an earth boring bit to increase the number of compacts in certain rows. The compacts that are pressed into holes in rows on the cones. The compacts are of tungsten carbide and have a cutting end axis and a barrel axis. The barrel axis intersects the cutting end axis at an obtuse angle. In the heel row, the barrel axis of at least some of the compacts is rotated to have less inclination than the cutting end axis. In an adjacent row to the heel row, each of the compacts has a barrel axis that is rotated to have more inclination than its cutting end axis and more inclination than the barrel axes of the heel row.
    Type: Application
    Filed: November 1, 2002
    Publication date: May 1, 2003
    Inventors: Greg Van Klompenburg, Brian A. Baker, Matthew R. Isbell
  • Patent number: 6533052
    Abstract: A drill bit suited for impact-assisted directional boring in rock includes a bit body having a frontwardly facing, circular main cutting surface having a number of main cutting teeth disposed thereon. A gage cutter extends radially outwardly from the main cutting surface, which gage cutter mounts at least one frontwardly facing gage cutting tooth thereon suitable for cutting in a circle during straight boring and over an angle defined by less than a full rotation of the bit in order to steer the bit. A heel on an outer side surface of the bit body at a position opposite to and behind the gage tooth provides a reaction surface for the gage cutter. The bit body and gage cutter have a nearly circular side profile along a front portion thereof such that a maximum radial clearance between the side profile and a side wall of a hole being drilled is not greater than about 10 percent of the radius of a circle cut by the gage tooth.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: March 18, 2003
    Assignees: Earth Tool Company, L.L.C., Vermeer Manufacturing Company (US)
    Inventors: Steven W. Wentworth, Robert F. Crane, Mark D. Randa, Randy R. Runquist, Richard K. Smith, Jr.
  • Patent number: 6516899
    Abstract: A drill head of directional boring includes a bit, a holder for a device for detecting angular orientation of the bit, and a hammer including a striker, wherein the bit assembly, holder and hammer are connected head to tail with the bit at a front end. The bit has a frontwardly facing main cutting surface having a plurality of main cutting teeth disposed thereon and a gage tower extending radially outwardly from the main cutting surface, which gage tower has at least one frontwardly facing gage cutting tooth thereon suitable for cutting over an angle defined by less than a full rotation of the bit. In one embodiment, the main cutting surface is substantially flat and circular and has fluid ejection ports thereon, and the drill head has passages for conducting a drill fluid therethrough to the ejection ports.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: February 11, 2003
    Assignees: Earth Tool Company, L.L.C., Vermeer Manufacturing Company (US)
    Inventors: Steven W. Wentworth, Robert F. Crane, Randy R. Runquist, Mark K. Van Houwelingen
  • Publication number: 20030024741
    Abstract: A drill bit configured for use in horizontal directional boring includes a spoon-shaped body with a rearwardly angled or inclined arcuate front end face that widens from a leading edge to a trailing edge in a circumferential direction, the front face sloping rearwardly from a leading side surface to a trailing edge in a circumferential direction, the leading and trailing side surfaces extending rearwardly in from the front end face. The leading side surface is wider than the trailing side surface. In one configuration, the front end surface and leading side face are each provided with a plurality of carbide inserts or studs which may be arranged in a row.
    Type: Application
    Filed: June 18, 2002
    Publication date: February 6, 2003
    Inventors: Steven W. Wentworth, Robert F. Crane, Douglas B. Caraway
  • Publication number: 20020166703
    Abstract: A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus. The reaming apparatus also provides enhanced protection from contact with the casing wall for selected structural features and elements thereof.
    Type: Application
    Filed: April 10, 2002
    Publication date: November 14, 2002
    Inventors: W. Gregory Presley, Christopher S. Charles, Steven R. Radford, Matthew J. Meiners, Mark E. Morris, D. Jay Clinkscales, Jeffrey B. Lund, Robert A. Laing, Matthew D. Mumma
  • Patent number: 6474425
    Abstract: A drill bit including a bit body and a plurality of blades formed in the bit body. The blades are formed, at least in part, from a base matrix material that on one embodiment is impregnated with abrasive particles. One side of the bit is formed, with respect to its axis of rotation, to a smaller radius than the opposite side of the bit. The asymmetry of the bit enables the bit to drill a larger diameter hole than a pass through diameter of the bit. The opposite side defines a contact angle between the bit and a formation. In one embodiment, the contact angle is at least 140 degrees. In one embodiment, a plurality of inserts may be located on the blades to provide gage protection. In another embodiment, the bit may also include a gage sleeve that helps keep the bit stabilized in the wellbore.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: November 5, 2002
    Assignee: Smith International, Inc.
    Inventors: David Truax, Timothy P. Beaton
  • Patent number: 6470979
    Abstract: An apparatus for mounting an electronic device therein for use in an underground boring machine includes an elongated housing having an elongated, lengthwise central cavity opening at one end thereof, a cartridge containing a sonde therein, which cartridge fits in the cavity; and a keying mechanism for securing the cartridge and sonde in a predetermined orientation relative to the housing when the cartridge is inserted into the cavity through the opening. One or more lengthwise fluid passages isolated from the cavity extend through the housing. A sonde housing of the invention may be used with a drill string and bit assembly in directional boring.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: October 29, 2002
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6450269
    Abstract: A bit for directional boring according to the invention includes a bit body having a frontwardly facing sloped face effective for steering the bit in dirt. The sloped face defines a steering plane that defines an acute included angle relative to a lengthwise axis of rotation of the bit. A connection is provided at the rear of the bit body permitting the bit to be removably mounted at the lead end of a drill string, and one or more internal passages are provided in the bit body for carrying a drilling fluid to a front end of the bit body. A first cutting tooth is mounted on the bit body and extends frontwardly from the bit body at a first angle that causes the first tooth to cut along a first circular path as the bit rotates.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: September 17, 2002
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Publication number: 20020125047
    Abstract: A reaming tool is disclosed which includes a body having reaming blades affixed thereto at azimuthally spaced apart locations around a circumference of the body. The reaming blades each have at least one cutter attached thereto at selected positions and orientations on each of the blades to minimize a net lateral force developed by the reaming tool. The tool includes a pilot hole conditioning section comprising a plurality of azimuthally spaced apart pilot blades affixed to the body longitudinally ahead of the reaming blades.
    Type: Application
    Filed: May 8, 2002
    Publication date: September 12, 2002
    Inventor: Timothy P. Beaton
  • Publication number: 20020112887
    Abstract: A directional borehole drilling system employs a controllable drill bit, which includes one or more conical drilling surfaces. Instrumentation located near the bit measures present position when the bit is static, and dynamic toolface when the bit is rotating. This data is processed to determine the error between the present position and a desired trajectory, and the position of one or more of the bit's cones is automatically changed as needed to make the bit bore in the direction necessary to reduce the error. The controllable drill bit preferably comprises three cone assemblies mounted about the bit's central axis, each of which includes a leg with “toed-out” axle. In response to a command signal, a cone translates along the axle to cause it to bear more of the bit weight, thus excavating more deeply over the commanded toolface sector and causing the bit to bore in a preferred direction.
    Type: Application
    Filed: February 20, 2002
    Publication date: August 22, 2002
    Inventor: William H. Harrison
  • Publication number: 20020112890
    Abstract: An apparatus for pulling a conduit through a horizontal bore includes a drill head having a forward most end including a pocket configured to receive an elongated body; coupler, a coupling member including an elongate body configured to fit in the pocket and a connecting end extending outside of the drill head beyond the pocket configured for coupling the coupling member and drill head to a conduit pulling means, a hole in the drill head intersecting the pocket alignable with a retainer aperture in the elongate body and a retainer adapted to pass through the aperture and hole to secure the coupling member to the drill head. In one variation, a clevis and or bearing swivel passed through an eyelet in the connecting end is used with a rope, chain or cable to connect the drill head to a pipe puller for pulling a pipe or conduit through an underground horizontal bore.
    Type: Application
    Filed: January 22, 2002
    Publication date: August 22, 2002
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6422782
    Abstract: The present invention provides an improved apparatus for mounting an electronic device such as a sonde therein for use in directional drilling. Such an apparatus includes an elongated housing having projections at opposite ends of the housing for connecting the housing to other components of the boring machine, an elongated internal chamber configured to receive an electronic device therein and having an elongated access opening which extends along an exterior surface of the housing, and a cover sized to close the access opening, the cover having a first hole extending therethrough.
    Type: Grant
    Filed: December 16, 1999
    Date of Patent: July 23, 2002
    Assignee: Earth Tool Company, L.L.C.
    Inventor: Steven W. Wentworth
  • Patent number: 6422328
    Abstract: A rotating tool for milling or drilling in a well bore, having one or more rotating cutting structures, with each cutting structure rotating about its own axis, and with the cutting structures rotating about the axis of the tool. The rotational axis of the tool is offset from the axis of at least one cutting structure, with the axis of the tool passing through that cutting structure. This ensures that the cutting structure which spans the axis of the tool rotates independently of the tool, to prevent the existence of a zero velocity point on the cutting face of the tool.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: July 23, 2002
    Assignee: Baker Hughes Incorporated
    Inventors: Jimmie Joe Holland, Barry Boswell
  • Patent number: 6397958
    Abstract: A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: June 4, 2002
    Assignee: Baker Hughes Incorporated
    Inventors: Christopher S. Charles, William Gregory Presley, Sean K. Berzas, Douglas J. Bobrosky, Mark W. Dykstra, Mark E. Morris, David M. Schnell, L. Allen Sinor
  • Publication number: 20020060095
    Abstract: The invention provides a rock drilling bit with a plurality of cutting teeth raked into the cut of the drilling bit. Such teeth are oriented at an angle of at least about 30 degrees relative to an imaginary line normal to a front surface of the cutting head from which the cutting teeth project. Such an arrangement provides the desired shear cutting force against the rock face while simultaneously reducing the shock and vibration applied to sonde housing and the drill string. The bit according to the invention may further incorporate a rear, frustoconical crushing surface that defines a space or zone crescent-shaped in cross-section that narrows from front to rear, and an improved replacable tooth for use on a rock drilling bit.
    Type: Application
    Filed: August 12, 1999
    Publication date: May 23, 2002
    Inventors: STEVEN W. WENTWORTH, ROBERT F. CRANE
  • Publication number: 20020043408
    Abstract: The invention provides a rock drilling bit with a plurality of cutting teeth raked into the cut of the drilling bit. Such teeth are oriented at an angle of at least about 30 degrees relative to an imaginary line normal to a front surface of the cutting head from which the cutting teeth project. Such an arrangement provides the desired shear cutting force against the rock face while simultaneously reducing the shock and vibration applied to sonde housing and the drill string. The bit according to the invention may further incorporate a rear, frustoconical crushing surface that defines a space or zone crescent-shaped in cross-section that narrows from front to rear, and an improved replacable tooth for use on a rock drilling bit.
    Type: Application
    Filed: October 26, 2001
    Publication date: April 18, 2002
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Publication number: 20020020565
    Abstract: A drillout bi-center bit includes first and second axes of rotation separated by a distance D, a first region of radius D centered on one of the axes of rotation, a second region of radius D centered on the other of the axes of rotation, and a third region defined by the overlap between the first and second regions, wherein the cutters provided within the third region are designed to withstand cutting in opposing cutting directions. This may be achieved by providing each cutter with two cutting faces, or by providing two groups of cutters, one group arranged to cut in one direction, the other group being designed to cut upon rotation in the other direction, one of the groups protruding from the bit body of the bit to a greater depth than the other group.
    Type: Application
    Filed: August 3, 2001
    Publication date: February 21, 2002
    Inventors: Steven James Hart, Graham R. Watson, Jeffery E. Daly
  • Publication number: 20020014354
    Abstract: A hydraulic percussion drill includes a piston hammer disposed in a cylinder for reciprocating movement in response to pressure fluid acting continuously on one transverse face of the piston hammer and in response to valving of pressure fluid alternately to an opposed piston face of the piston hammer by a tubular sleeve valve disposed around the piston hammer. The drill includes a percussion bit configured to have a face portion disposed at an acute angle with respect to a plane normal to the bit and the drill central axis. Cooperating spiral splines on the bit and a bit chuck provide for directional drilling using a method which includes causing the bit to receive impact blows without rotating the cylinder housing to initiate a deviated drillhole.
    Type: Application
    Filed: April 3, 2001
    Publication date: February 7, 2002
    Inventor: William N. Patterson
  • Publication number: 20010045306
    Abstract: Although particular detailed embodiments of the apparatus and method have been described herein, it should be understood that the invention is not restricted to the details of the preferred embodiment. Many changes in design, composition, configuration and dimensions are possible without departing from the spirit and scope of the instant invention.
    Type: Application
    Filed: September 8, 1999
    Publication date: November 29, 2001
    Inventors: COY M. FIELDER, ROGERIO H. SILVA
  • Patent number: 6321858
    Abstract: An improved drill bit for directional drilling includes a housing or headpiece having means at a rear end thereof for mounting the bit on a trailing component of a drill head, and passages for ejection of drilling fluid into a borehole. A first axle is mounted to extend forwardly from a front end of the housing, and a first roller is rotatably mounted on the first axle. The first roller has cutting projections such as carbide studs thereon and extends outside of the outer diameter of the housing by a distance which defines the size of the borehole when the drill bit is rotated over 360 degrees. A second axle is mounted to extend from the front end of the housing, and a second roller is rotatably mounted on the second axle at a position offset from the first axle. The second roller extends slightly outside of the outer diameter of the housing, but by a distance less than the distance the first roller extends outside of the housing.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: November 27, 2001
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6308790
    Abstract: A drill bit with dropping tendencies includes an active region, a passive region, a biased mass distribution, an uneven torque generation, and an imbalance force vector directed toward the middle of the active region. Cutting elements in the active region of the drill bit may be more aggressive than those in the passive region through manipulation of, e.g., backrake angle, blade length, cutter sizes, blade angles and bit profile. The imbalance force vector may be achieved by manipulation of bit geometric parameters such as cutter radial position, angular position, longitudinal position, and rake angle.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: October 30, 2001
    Assignee: Smith International, Inc.
    Inventors: Graham Mensa-Wilmot, John H. Simmons
  • Publication number: 20010030065
    Abstract: A PDC-equipped rotary drag bit especially suitable for directional drilling. Cutter chamfer size and backrake angle, as well as cutter backrake, may be varied along the bit profile between the center of the bit and the gage to provide a less aggressive center and more aggressive outer region on the bit face, to enhance stability while maintaining side cutting capability, as well as providing a high rate of penetration under relatively high weight on bit.
    Type: Application
    Filed: May 14, 2001
    Publication date: October 18, 2001
    Inventors: Christopher C. Beuershausen, Mark W. Dykstra, Roger Fincher, Roland Illerhaus, Steve R. Matson, James A. Norris, Michael P. Ohanian, Rudolf C.O. Pessier
  • Publication number: 20010025638
    Abstract: A drill bit for producing circular-cylindrical recesses or boreholes is formed of a drilling cylinder (1) having cutting elements (3) at the leading end in the drilling direction. A detachable core sleeve (2) is arranged in the interior of the drilling cylinder (1). The cutting elements (3) extend radially inwardly at least for the wall thickness (a) of the core sleeve (2). The core sleeve (2) serves to receive a core formed of removed masonry and is intended to facilitate removal of the core from the drill bit. The manageability of the drill bit is substantially improved in this way.
    Type: Application
    Filed: February 7, 2001
    Publication date: October 4, 2001
    Inventors: Diep Chau-Ngoc, Rolf Spangenberg
  • Patent number: 6296069
    Abstract: A drill bit as used in particular in the oil well drilling field comprising a central body (2), cutting blades (3) protruding with respect to the body (2), both at the front of this body according to a drill direction and at the sides of this same body (2), and cutting elements (9) divided over an outer front surface (10) and over an outer lateral well sizing surface (11) comprised by each blade (3), wherein there are provided as cutting elements: in a central area (13) of the front surface (10), on at least one blade (3): at least one synthetic polycrystalline diamond compact cutting disc (12), and in a remaining area (14) of the front surface (10) of this blade, situated beyond said central area (13) with respect to the rotation axis, and on the other blades: thermally stable synthetic diamonds and/or impregnated diamond particles.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: October 2, 2001
    Assignee: Dresser Industries, Inc.
    Inventors: Etienne Lamine, Robert Delwiche
  • Patent number: 6263983
    Abstract: The invention provides an improved apparatus for directional boring and in particular an improved system for boring through hard and rocky substrates frequently encountered when boring under obstacles such as roadways. According to one aspect of the invention, a directional drilling apparatus includes a drilling head having a front face angled relative to the lengthwise axis of the tool and configured for steering the drilling apparatus, a housing having an internal chamber for mounting an electronic locating device therein rearwardly of the drilling head for transmitting a signal indicating the orientation of the angled face of the drilling head, and a joint at which the drilling head is removably mounted to the housing of the locating device.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: July 24, 2001
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6260634
    Abstract: The invention provides an apparatus for mounting an electronic device therein for use in an underground boring machine. Such an apparatus includes an elongated housing having means at opposite ends of the housing for connecting the housing to other components of the boring machine and an elongated internal chamber configured to receive an electronic device such as a sonde therein and having an elongated access opening which extends along an exterior surface of the housing. A cover sized to close the access opening has edges that fit beneath one or more flanges of the housing. A retainer such as a roll pin is sized for insertion into openings in the cover and housing, which openings become aligned when the cover is positioned with the edges beneath the flange of the housing.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: July 17, 2001
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6247544
    Abstract: A directing blade for a directional boring machine includes a blade body which extends along a longitudinal axis from an attachment end to a free end. The free end has a plurality of cutting teeth disposed in a non-symmetrical pattern relative to the longitudinal axis. The teeth are progressively spaced from a center portion of the leading end alternating from a first side to a second side of the body of the duckbill blade.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: June 19, 2001
    Assignee: Vermeer Manufacturing Company
    Inventor: Randal M. Beebe
  • Patent number: 6148935
    Abstract: A joint is provided for coupling a pair of elongated members such as a sonde housing and starter rod end to end. Such a joint includes a projection extending in a lengthwise direction from one end of one of the elongated members and a socket in an end of the other of the elongated members, which socket is sized to slidingly receive the projection. A set of alignable transverse openings are provided in the projection and in a wall defining the socket, which openings are configured to receive a removable retainer for mechanically interlocking the projection in the socket. An interlock mechanism, such as a spline and groove connection, prevents relative rotation between the elongated member (e.g., housing and starter rod) when the projection is fully inserted into the socket.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: November 21, 2000
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6125950
    Abstract: A collared boring bit which interfaces with a boring head whereby shear forces developed during a boring operation are transmitted through the collar to the boring head, with minimal shear force being carried by the bolts. A bit collar is welded to a boring bit, wherein a head receptacle formed collectively of the bit collar and the boring bit seatably receives a boring head with substantially close clearance so that shear forces during boring operations are transmitted from the boring bit to the boring head through the bit collar. The preferred bit collar is fabricated from a pipe section, such as for example steel seamless pipe. A bit recess is cut for interfacing with a boring bit at the head face connection thereof. A head recess is cut opposite the bit recess for providing an exit for the water spray from the nozzle thereof.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: October 3, 2000
    Inventor: Joseph D. Osborne
  • Patent number: 6116356
    Abstract: A method and apparatus for reaming or enlarging a borehole with enhanced stability. A pilot stabilization pad (PSP) having an axially and circumferentially tapered entry surface and a circumferential transition surface thereabove is employed to enhance the transition from the smaller diameter borehole to be enlarged while accommodating the side force vector generated by the cutting assembly used to effect the enlargement. In addition, one or more eccentric stabilizers are employed above the reaming apparatus to laterally or radially stabilize the bottomhole assembly, which may comprise either a straight-hole or steerable, motor-driven assembly.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: September 12, 2000
    Assignee: Baker Hughes Incorporated
    Inventors: Michael L. Doster, Rudolf C. O. Pessier, David M. Schnell, Bart T. McDonald
  • Patent number: 6039131
    Abstract: A PDC bit for cutting a hole below a point in a formation, the diameter of the hole being greater than the diameter of the hole above the point, comprising: a bit body having an axis of rotation, a first cutting portion having a first radial extent from the axis of rotation, a second cutting portion that is not axially spaced apart from the first cutting portion and that has a second radial extent that is greater than said first radial extent, wherein the total imbalance forces resulting from engagement of said first and said second cutting portions with the formation are balanced such that the resulting torque on the bit is minimized and in particular, the component of the torque on the bit about an axis normal to the axis of rotation is minimized. In some embodiments, the bit has a central recessed portion on its face, which receives a short "core" portion that enhances stabilization of the bit.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: March 21, 2000
    Assignee: Smith International, Inc.
    Inventor: Timothy P. Beaton
  • Patent number: 6032750
    Abstract: Drilling tool with a drill head with an end face pointing in the feed direction and which has a main bit, which forms a drill point located in the drill axis and the bit is inclined on either side in a substantially roof-shaped manner and the tool has drilling dust grooves. The main bit has a primary cutting edge, which extends radially over at least one side of the main bit, and a secondary cutting edge, which extends radially over substantially the remaining length of the main bit and is axially set back with respect to the primary cutting edge counter to the feed direction by at least the amount of feed in millimeters per revolution.
    Type: Grant
    Filed: February 4, 1998
    Date of Patent: March 7, 2000
    Assignee: Gebrueder Heller Dinklage GmbH
    Inventors: Heinrich Kersten, Hartmut Precht
  • Patent number: 5950743
    Abstract: A method for directional boring of all earth formations such as dirt, sand, rock and/or any type combination of formations, utilizing a bit body containing fixed and semi-floating cutting points and one or more fluid channels for the purpose of lubricating and dispersing cut and/or fractured formations.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: September 14, 1999
    Inventor: David M. Cox
  • Patent number: 5937958
    Abstract: A drill bit adapted to walk predictably during drilling is disclosed, comprising: a bit body having a longitudinal axis and a bit face having an active zone and a passive zone, and a plurality of cutters on the bit face, a first portion of said cutters being positioned in the active zone and a second portion of said cutters being positioned in the passive zone, the first portion of cutters being more aggressive than the second portion. This the difference in aggressiveness of cutters in the first and second portions is achieved by maximizing the effect of one or more of seven features of the bit. These features include: cutter size, cutter tip profile, blade relationship, cutting structure, back rake, gage pad design and balance. Application of the principles of the present invention result in a large imbalance vector being oriented toward the leading half of the active zone.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: August 17, 1999
    Assignee: Smith International, Inc.
    Inventors: Graham Mensa-Wilmot, Carl W. Keith
  • Patent number: 5931240
    Abstract: A method for directional boring of all earth formations such as dirt, sand, rock and/or any type combination of formations, utilizing a bit body containing fixed and semi-floating cutting points and one or more fluid channels for the purpose of lubricating and dispersing cut and/or fractured formations.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: August 3, 1999
    Inventor: David M. Cox
  • Patent number: RE36817
    Abstract: A reaming apparatus for enlarging a borehole, including a tubular body having one or more longitudinally and generally radially extending blades circumferentially spaced thereabout. Each of the blades carries highly exposed cutting elements, on the order of fifty percent exposure, on its profile substantially all the way to the gage. At least one of the blades is a primary blade for cutting the full or drill diameter of the borehole, while one or more others of the blades may be secondary blades which extend a lesser radial distance from the body than the primary blade. A secondary blade initially shares a large portion of the cutting load with the primary blade while the borehole size is in transition between a smaller, pass through diameter and drill diameter. It functions to enhance the rapidity of the transition while balancing side reaction forces, and reduces vibration and borehole eccentricity.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: August 15, 2000
    Assignee: Baker Hughes Incorporated
    Inventors: Paul E. Pastusek, Corey S. Thayn