Plural Openings Patents (Class 175/418)
  • Patent number: 9598910
    Abstract: A roof-bolt drill bit includes a bit body that is rotatable about a central axis, a coupling pocket defined in the bit body, and at least one cutting element mounted to the bit body. The at least one cutting element includes a cutting face, a cutting edge adjacent the cutting face, a back surface opposite the cutting face, and a side surface extending between the cutting edge and the back surface. The roof-bolt drill bit additionally includes a coupling attachment coupled to the bit body, the coupling attachment being positioned adjacent to a portion of the side surface of the cutting element that abuts a side surface of the coupling pocket.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: March 21, 2017
    Assignee: DOVER BMCS ACQUISITION CORPORATION
    Inventors: Russell Roy Myers, E. Sean Cox
  • Patent number: 9371701
    Abstract: A roof-bolt drill bit includes a bit body rotatable about a central axis and at least one cutting element coupled to the bit body. The bit body has a forward end, a rearward end axially opposite the forward end, and an internal passage defined within the bit body, with the internal passage extending from a rearward opening defined in the rearward end of the bit body through at least a portion of the bit body. The at least one cutting element includes a cutting face, a cutting edge adjacent the cutting face, and a back surface spaced away from the cutting face, the back surface being mounted to the bit body. An opening defined in the bit body is positioned adjacent to the back surface of the at least one cutting element.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: June 21, 2016
    Assignee: DOVER BMCS ACQUISITION CORPORATION
    Inventors: E. Sean Cox, Russell Roy Myers
  • Patent number: 9217287
    Abstract: In a pulsed-electric drilling system, a nonrotating bit is given a noncircular shape to drill a correspondingly-shaped borehole, e.g., triangular, rectangular, polygonal, oval, or a more complex shape. Some embodiments employ a reconfigurable bit that deploys extensions as needed to dynamically vary the cross-section of the borehole at selected locations. In this fashion, a driller is able to create borehole with a preferred cross-sectional shape to, e.g., drill the smallest possible hole while simultaneously providing additional clearance for equipment or instrumentation, additional surface area for well inflow, channels for improved borehole cleaning, teeth for improved cementing, reduced contact area to reduce drag on the drillstring, or any other benefits achievable by customizing the borehole cross-section.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: December 22, 2015
    Assignee: HALLIBURTON ENERGY SERVICES, INC.
    Inventors: Blaine C. Comeaux, Ronald J. Dirksen
  • Patent number: 8881847
    Abstract: A dust collecting device disposed circumferentially around a roof tool and in association with a roof drill bit and slidable thereon for collecting and removing dust generated during a dry drilling operation. The dust collecting device comprises a cylinder member, a bushing, and a mounting assembly comprising a top washer, a rubber insert, and a bottom washer. Another aspect of the invention provides a dust collecting device comprising a cylinder member, a bushing, and a mounting assembly comprising a disk and clips. The rubber insert and the clips resist movement of the dust collecting device along the drill steel of the roof tool during the drilling operation.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: November 11, 2014
    Assignee: Kennametal Inc.
    Inventors: Chad Allen Swope, Douglas Edward Bise
  • Publication number: 20140291035
    Abstract: A drill bit for percussive rock drilling tools includes a drill bit head having a front surface including a face surface defining a forward-most end of the drill bit head and at least one hole in the drill bit head for receiving a button. The drill bit includes at least one recess located in the face surface. The recess is larger than the hole. The hole is disposed in the recess so that an open end of the hole is disposed below the face surface. The drill bit head further includes a gauge surrounding the face surface, the recess being partially disposed in the gauge.
    Type: Application
    Filed: October 23, 2012
    Publication date: October 2, 2014
    Inventor: Conny Seppala
  • Patent number: 8550191
    Abstract: Provided is an excavation tool for efficiently taking waste rocks produced during excavation into the inner peripheral side of a casing pipe. An excavation tool (10) includes a casing shoe (11), a casing pipe (15), a rod (60), a device (40), and an excavation bit (20). The excavation bit (20) has a head portion (22) and a skirt portion (23). The head portion (22) is provided with: a face flute (27), which is open into the tip face of the head portion and extends radially outward; a connection flute (28), which is integrally connected to the outer peripheral end of the face flute (27) and extends toward the rear end side, and an intake hole (29), which is integrally connected with the discharge flute (46) of the device (40) and is open to the inner peripheral side of the skirt portion (23) from the connection flute (28).
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: October 8, 2013
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yoneo Hiwasa, Masaya Hisada, Kazuyoshi Nakamura
  • Publication number: 20120325558
    Abstract: A rock drill bit for percussive drilling comprising a bit head configured to be attached at an end of a drill element of a drilling assembly and having a diameter larger than that of a said drill element. The bit head has at a front end as seen in the intended drilling direction a generally frusto-conical shape defined by a substantially circumferential ring provided with a plurality of gauge buttons distributed along the extension of the ring for engaging material to be crushed. A central flush channel extends through the bit head and has at least one flushing hole opening at said front end to conduct flushing medium to said front end. At least one peripheral flushing hole of said at least one flushing hole opening at said front end opens in said substantially circumferential ring. At least two peripheral flushing holes open in said substantially circumferential ring.
    Type: Application
    Filed: February 16, 2011
    Publication date: December 27, 2012
    Inventors: Christer Lundberg, Rasmus Hemph
  • Publication number: 20110253456
    Abstract: Embodiments provide apparatuses and methods for excavation and drilling, particularly reverse circulation hammers and bits. Reverse circulation hammers and bits manufactured in accordance with various embodiments may help to prevent fatigue and breaking of the bit during a drilling operation, may prevent clogging of return holes, may provide higher efficiency drilling operations, and may provide modular bit designs that may be interchanged to suit a particular drilling operation.
    Type: Application
    Filed: March 22, 2011
    Publication date: October 20, 2011
    Inventor: Timothy W. Conn
  • Publication number: 20100108398
    Abstract: A design of crown of drill bit for percussive rock drilling with big “V” shape front flushing grooves, small central “dead” area will reduce the repeatedly crushing of broken rock cuttings. It will not only improve the rate of penetration, but also decrease the hole deviation, as well as the erosion to the outer surface of drive sub and case tube of DTH hammer.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 6, 2010
    Inventor: Dongmin Niu
  • Publication number: 20100018774
    Abstract: An excavator for underground excavating arranged to perform excavating work with low vibration and low noise. A rotary excavator and an underground excavating method are also provided. The excavator (1) for underground excavating comprises a plurality of bits (42a, . . . ) having the outside diameter smaller than that of the excavator body (2) and advancing/retracting to/from the excavating side, piston case members (22b, . . . ) incorporating pistons (61) for applying a hitting force to respective bits (42a, . . . ) by the energy of working fluid, a section (30) for storing the working fluid being fed to respective piston case members (22b, . . . ), working fluid circulation passages (352) for allowing the working fluid being fed to respective piston case members (22b, . . . ) to pass, and a body of rotation (40) provided with a plurality of holes (4a, . . . ) for allowing the fluid storage section (30) to communicate with the circulation openings (3a, . . .
    Type: Application
    Filed: November 29, 2007
    Publication date: January 28, 2010
    Inventor: Kazunori Furuki
  • Patent number: 7581602
    Abstract: There is provided a down hole hammer having a drive sub or chuck (10) having splines (11), and a drill bit (13) having a bit shank (14) having longitudinal splines (23) extending toward a bit head (15) having a bit face (16) bounded by a series of gauge row mounting portions (17), each of which has a carbide button insert (20). The bit shank splines (23) cooperate with chuck splines (11) to rotate the bit (13), the respective splines (23), (11) being proportioned to allow hammer motor exhaust air to pass down the splines. Drillings (37) are drilled from the termination of the spline milling, through to intersect with fluid passage (33) extending from sample recovery bore (22) to the bit face (16). A bore seal (32) is formed by milling a plurality of circumferential grooves (36), fed by a plurality of transverse holes (35) intersecting the air passage (33). Fluid passage (33) may be altered to fine tune the airflow to suit specific ground conditions, by effecting a change in diameter at point (38).
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: September 1, 2009
    Assignee: Sparroc Drillco Services Pty Ltd
    Inventors: Tony Lorger, Daniel Paul Lorger, Sugavanum Ravichandra
  • Publication number: 20090044986
    Abstract: A drill, a drill assembly, and a tool head for a cutting tool. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.
    Type: Application
    Filed: September 16, 2008
    Publication date: February 19, 2009
    Inventors: Horst Manfred JAEGER, Peter Karl MERGENTHALER, Berthold Heinrich ZEUG
  • Patent number: 7467674
    Abstract: In a reverse circulation down-the-hole hammer assembly a having a axially extending central tube (30) for recovery of drilling debris, the central tube (30) has a downwardly facing abutment (32) and an upwardly facing upper end and is located axially in the hammer assembly by having the part thereof between the downwardly facing abutment and the upper end located between axially spaced complementary abutments, one of which fixed and the other of which is provided by a resiliently longitudinally displaceable member (42) within a casing part providing an upper end of the hammer assembly and which is removably retained in an adjoining part of the hammer assembly. The longitudinally displaceable member engages the upper end of the central tube and thus clamps the central tube in place.
    Type: Grant
    Filed: April 5, 2005
    Date of Patent: December 23, 2008
    Assignee: Halco Drilling International Limited
    Inventor: Christopher James Green
  • Patent number: 7455126
    Abstract: A percussion drill bit for drilling into a subterranean earth formation. The drill bit has a central longitudinal axis and is operable by applying axial percussive motion along the axis and rotary motion about the axis. The drill bit is provided with a plurality of blades protruding from the drill bit and, a plurality of flow channels stretching along the drill bit in a substantially radial direction whereby the successive flow channels are formed between two adjacent blades. Shear cutters are provided in a row on or close to the leading edge of at least one of the blades with respect to the direction of rotary motion trailingly adjacent to the flow channel that is associated with it. A fluid may be run through the flow channel to remove cutting debris accumulating in front of the row of shear cutters. In addition to these shear cutters, axial cutters are located, with respect to the direction of rotary motion, in a trailing position with respect to the row of shear cutters and its associated flow channel.
    Type: Grant
    Filed: May 25, 2004
    Date of Patent: November 25, 2008
    Assignee: Shell Oil Company
    Inventor: Antonio Maria Guimaraes Leite Cruz
  • Patent number: 7410013
    Abstract: An apparatus (10) for use in boring is described, the apparatus including a rotatable drive shaft (12), a cam member (20) and followers (16) for converting rotational motion into reciprocal motion, and a shroud (24) having a cutting edge (26) driven by the cam member and followers. The shroud may be selectively engageable with the cam member and followers, allowing the drive shaft to be removed through the shroud. A fluid circulation arrangement (31), (13) allows air to be injected into loose drilling substrate, so assisting removal of drill cuttings from the boring apparatus. Also described is a drill string incorporating a similar arrangement, allowing the drill string to be reciprocated within a bore. The drill string may further include casing sections, which may have intumescent coatings to allow the sections to be fixed in a wellbore.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: August 12, 2008
    Assignee: Wave Craft Limited
    Inventor: Hugh Edward Fisher
  • Patent number: 7377338
    Abstract: A pressure fluid actuated downhole percussion tool includes a reciprocating piston hammer with differential transverse pressure surfaces cooperable with a cylinder housing, a guide sleeve and a bit carried exhaust tube to form opposed pressure fluid chambers to which pressure fluid may be conducted to deliver repeated impact blows to a bit having circumferentially spaced bosses and replaceable cutting inserts. The bit is drivenly connected to the tool by plural drive pins supported in circumferentially spaced grooves in the bit shank and in a removable sub supported by the tool housing. Improved earth penetration performance is realized utilizing a claw bit with a pressure fluid actuated percussion tool providing rotation as well as selective deliverance of impact blows through the bit.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: May 27, 2008
    Inventor: Grey Bassinger
  • Patent number: 7296641
    Abstract: A rock drill bit for percussive drilling includes a front face which has radially outer and inner portions. Fluid channels are disposed in the head portion in communication with the inner portion of the front face. The inner portion of the front face carries a plurality of front buttons. The outer portion comprises circumferentially spaced steel portions which are axially raised relative to the inner portion. Each raised portion carries one or two peripheral buttons located radially outwardly of an imaginary circle which intersects at least two of the front buttons and at least two of the flushing channels. The imaginary circle is arranged coaxially relative to the center axis.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: November 20, 2007
    Assignee: Sandvik Intellectual Property AB
    Inventors: Per-Ola Hadin, Fredrik Björk
  • Patent number: 7207402
    Abstract: A percussion drill bit for drilling a bore includes a drill body having a connecting section at a rear end thereof for connection to a percussive unit, and a plurality of cemented carbide buttons embedded in a front end of the drill body. Each button comprises a cemented carbide body having a rear mounting portion embedded in the drill body, and a front end protruding from the drill body. The front end of the cemented carbide button is substantially semi-spherically curved and defined by a radius whose origin is disposed axially rearwardly of a plane through the largest diameter of the button. The button projects from the drill bit body a distance which is not less than 50% of the button diameter. A conical intermediate surface forms, in cross-section, an acute angle of about 13–19° with an envelope surface of the rear mounting portion.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: April 24, 2007
    Assignee: Sandvik Intellectual Property AB
    Inventor: Fredrik Björk
  • Patent number: 7168511
    Abstract: A rotary drill bit insert that includes an elongate body that is rotatable about a central axis wherein the elongate body has a pair of symmetrical halves symmetrical about the central axis. The elongate body contains a central notch disposed between the symmetric halves of the elongate body. Each symmetrical half includes a leading face and a top surface that has a leading surface and a trailing relief surface wherein the leading surface and the trailing relief surface are contiguous and non-coplanar. Each half also has a leading cutting edge at the intersection of the leading face and the leading surface of the top surface. The leading surface is inclined at a constant angle of inclination in a radial direction with respect to a first radial line projecting from the central axis, and the leading surface being inclined downwardly and rearwardly from the leading cutting edge.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: January 30, 2007
    Assignee: Kennametal Inc.
    Inventors: Gerald L. Woods, Lynn A. Alcorn
  • Patent number: 7163070
    Abstract: A drill head for use in drilling bores in mines and tunnels has a bit and at least one suction opening (5) for removing drillings and having a crushing profile.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: January 16, 2007
    Assignee: Hilti Aktiengesellschaft
    Inventors: Roland Gienau, Wolfgang Ludwig, Erich Leibhard
  • Patent number: 7070010
    Abstract: A drill bit comprises, on its face, either only curved cutting edges or a combination consisting of at least one straight cutting edge and at least two curved cutting edges. The cutting edges on the face of the drill bit are arranged such that they start from the axis of the drill bit or end directly adjacent thereto. Three channels start from a blind hole serving to attach the drill bit to an anchor rod of an injection boring anchor, and their openings are not located in the area of the face of the drill bit but are situated in the area of the lateral surface of the same, said lateral surface conically expanding toward the cutting edges. The openings of the channels are placed in the area of concave recesses of the lateral surface of the drill bit in such a manner that they are recessed with regard to the periphery of the face of the drill bit.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: July 4, 2006
    Assignee: Atlas Copco MAI GmbH
    Inventor: Herbert Papousek
  • Patent number: 7011156
    Abstract: A percussion apparatus and method of using the percussion apparatus. The apparatus may be used for delivering an impact to a tubular string. The apparatus comprises a cylindrical member having an internal bore containing an anvil and a first guide profile. The apparatus further includes a rotor disposed within the internal bore, and wherein the rotor member comprises a body having an outer circumference with a second guide profile thereon, and wherein the rotor contains a radial hammer face. In a first position, the second external guide profile of the rotor will engage with the first guide profile of the cylindrical member so that the radial hammer face can contact the anvil. In a second position, the second guide profile of the rotor will engage with the first guide profile of the cylindrical member so that the radial hammer face is separated from the anvil shoulder. Multiple rotors and multiple stators may be employed. The rotor may be operatively associated with a stator that directs flow into the rotor.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: March 14, 2006
    Assignee: Ashmin, LC
    Inventor: Gunther H H von Gynz-Rekowski
  • Patent number: 6915867
    Abstract: A drill bit that has a drill bit body with a side wall and opposite ends. A distal one of the opposite ends of the drill bit body receives a cutting insert. The drill bit body contains at least two helical debris ports in the side wall thereof. The drill bit body further contains a helical scallop that corresponds to each one of the helical debris ports. Each one of the helical scallops surrounds so as to define the periphery of its corresponding one of the helical debris ports.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: July 12, 2005
    Assignee: Kennametal Inc.
    Inventor: Douglas E. Bise
  • Patent number: 6886645
    Abstract: Fluid roof bits for mining typically supply high pressure water to a location immediately adjacent the cutting insert of the roof bit to flush debris and cool the cutting insert. The present invention is a drill steel assembly for a wet roof bit that reduces the fluid pressure loss supplied to the roof bit. A drill head body is connected to the drill steel by an intermediate adaptor. The adaptor has a spring loaded button thereon that mates with an opening in the drill head body so that the drill head body can be conveniently snapped onto the drill head assembly. A bushing seal made from a flexible material is clamped between said drill steel adaptor and the drill head body to limit fluid pressure losses.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: May 3, 2005
    Assignee: Kennametal Inc.
    Inventors: Douglas E. Bise, Phillip W. Haga
  • Publication number: 20040134688
    Abstract: A drill bit (1) comprises, on its face, either only curved cutting edges (2) or a combination consisting of at least one straight cutting edge (2′) and at least two curved cutting edges (2). The cutting edges (2,2′) on the face of the drill bit (1) are arranged such that they start from the axis (4) of the drill bit (1) or end directly adjacent thereto. Three channels (10) start from a blind hole (5) serving to attach the drill bit (1) to an anchor rod of an injection boring anchor, and their openings (11) are not located in the area of the face of the drill bit (1) but are situated in the area of the lateral surface (13) of the same, said lateral surface conically expanding toward the cutting edges (2, 2′). The openings (11) of the channels (10) are placed in the area of concave recesses (12) of the lateral surface (13) of the drill bit (1) in such a manner that they are recessed with regard to the periphery of the face of the drill bit (1).
    Type: Application
    Filed: November 17, 2003
    Publication date: July 15, 2004
    Inventor: Herbert Papousek
  • Patent number: 6595305
    Abstract: A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: July 22, 2003
    Assignee: Kennametal Inc.
    Inventors: Curnie A. Dunn, Phillip W. Haga, Ted R. Massa, Douglas E. Bise, Gary J. Condon, Stephen T. Belsheim, James E. Rutherford
  • Patent number: 6543557
    Abstract: The invention concerns a down the hole drill hammer assembly providing a full piston area exposure to driving fluid pressure by the omission of the usual finger valve from the upper piston area and providing the piston with blind bores at each end and passages through the piston wall enabling predetermined communication between the blind bores for exhausting pressure fluid through the drill bit assembly. Fluid transfer passages are also provided in the inner wall of an outer wear sleeve of the drill hammer assembly.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: April 8, 2003
    Inventor: Bernard Lionel Gien
  • Patent number: 6467558
    Abstract: Three air hammers are housed and arranged in a hammer case, and have bits at their respective ends. Each of the air hammers can be activated independently. In a normal excavation, the earth is excavated by activating all the air hammers. When correcting an excavating direction, only an air hammer positioned in the correct direction is activated first so that the earth in the correct direction is excavated in a predetermined amount. Next, all the air hammers are activated to excavate the earth. Thereby, a leading hammer can direct the excavation toward the correct direction, and thus the excavating direction is corrected.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: October 22, 2002
    Assignee: Tone Corporation
    Inventors: Osamu Miyamoto, Yoshio Akiyama, Taro Watanabe
  • Patent number: 6315064
    Abstract: A rotatable cutting bit for penetrating an earth formation wherein the rotatable cutting bit includes an elongate bit body having a forward end and a rearward end. The bit body further defines a peripheral surface. The bit body has a first cutting insert affixed thereto at the axially forward end thereof. The first cutting insert has a first leading cutting edge and a first side clearance cutting edge. The first cutting insert is attached to the bit body so that the first side clearance cutting edge radially extends past the peripheral surface of the bit body so as to engage the earth formation.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: November 13, 2001
    Assignee: Kennametal PC Inc.
    Inventors: Ted R. Massa, David R. Siddle
  • Patent number: 6276467
    Abstract: A percussive rock drill bit includes a steel bit body and carbide button inserts mounted in a front cutting face thereof. The bit body includes a passage intersecting the front cutting face for conducting a flushing/cooling medium to the front cutting face. The flushing/cooling medium travels to an outer periphery of the bit body and travels upwardly within flushing grooves formed in the outer periphery of the bit body. Portions of the bit body situated between successive ones of the flushing grooves constitute wings of the bit body. Some of the button inserts constitute gauge inserts. Only a gauge insert is mounted in each wing. At least some, possibly all, of the gauge inserts are offset circumferentially from a center of the respective wing toward a trailing end of the wing.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: August 21, 2001
    Assignee: Driltech Mission LLC
    Inventor: Karl Ingmarsson
  • Patent number: 6253864
    Abstract: A drill bit that combines the forces of high rotational torque and percussive impact with impact-resistant shear cutting inserts in order to increase formation penetration rates, particularly in deep wells were borehole pressure is high. The drill bit may also be used in cooperation with high-pressure jets that augment penetration, cool the shear cutting inserts, and remove the chips.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: July 3, 2001
    Inventor: David R. Hall
  • Publication number: 20010003318
    Abstract: A drill bit, the frame of which comprises a front section with protrusions. A set of first rear teeth is arranged at the front section, preferably at the rear part of the protrusions. The set of first rear teeth broadens a drilled hole when the drill is reversed.
    Type: Application
    Filed: December 6, 2000
    Publication date: June 14, 2001
    Applicant: OY ROBIT ROCKTOOLS LTD.
    Inventor: Teijo Juhana Hulkkonen
  • Patent number: 6189633
    Abstract: A drill for forming bores in constructional components, and including a sleeve-shaped stem (2; 12; 22; 32; 42; 52) having an axially-extending through-bore (3; 13; 23; 33; 43; 53) which opens into mouth openings (7; 10; 14; 24; 34; 44; 54) formed in opposite end sections of the stem (2; 12; 2; 32; 42; 52); a shank (5) provided at a rear end of the stem, and a drilling head (8; 15; 25; 35; 45; 55) formed of a hard material and secured in at least one slot (19; 29; 49; 59) formed in a free front end of the stem (2; 12; 22; 32; 42; 52), with a section of the drilling head (8; 15; 25; 32; 45; 55), which is embedded in the stem (2; 12; 22; 32; 42; 52), flatly engaging a material of the stem (2; 12; 22; 32; 42; 52) and being fixedly connected with the stem material.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: February 20, 2001
    Assignee: Hilti Aktiengesellschaft
    Inventors: Werner Kleine, Hans-Werner Bongers-Ambrosius
  • Patent number: 6105693
    Abstract: The present invention relates to a partially enhanced drill bit (10') for percussive drilling. The bit comprises a bit body, at least one annular row of non-enhanced buttons (11') mounted in the bit body; and at least one annular row of enhanced buttons (12') mounted in the bit body radially outside of the non-enhanced buttons. At least one annular row of non-enhanced buttons (11') and said at least one annular row of enhanced buttons (12') are provided to partly overlap each other. There is an axial shoulder (19') radially outside of the non-enhanced buttons (11'). There are chamfers (20') at least partly surrounding the enhanced buttons (12'). These chamfers (20') interrupt the shoulder (19') in the circumferential direction.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: August 22, 2000
    Assignee: Sandvik AB
    Inventor: Karl Ingmarsson
  • Patent number: 6065908
    Abstract: A drill for forming bores in constructional components and including a tubular stem (2; 22; 32; 42) having an axially extending through-channel (3; 23; 33; 43) which opens into at least one suction opening (7; 11; 27; 37; 47), a shank (5) provided at a rear end of the stem for connecting the drill to a drilling tool (M), and a drilling head (8; 28; 38; 48) having lips (9; 29; 39; 49) and formed entirely of a cutting material and substantially butt-joined to the stem (2; 22; 32; 42) at a free front end of the stem (2; 22; 32; 42), with at least one suction opening being formed by a mouth opening of a front channel (12; 26; 36; 46) which is limited, at least partially by a material of the drilling head (8; 28; 38; 48) and a mouth surface of which, at least partially is arranged in a circumferential region of at least one of the stem (2; 22; 32; 42) and the drilling head (8; 28; 38; 48).
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: May 23, 2000
    Assignee: Hilti Aktiengesellschaft
    Inventors: Werner Kleine, Hans-Werner Bongers-Ambrosius
  • Patent number: 6035953
    Abstract: A down hole hammer assembly comprising a reverse circulation hammer (11) having a drill bit (12) mounted to one end of a housing which accommodates a percussive hammer, the other end of the housing being adapted to be mounted to a drill string, the assembly further comprising a support member (14) receivable on the lower end of a bore hole casing (13) which is receivable over the drill string, the support (14) comprising a first part (15) adapted to be fixed to the lower end of the casing and a second part (16) rotatably received on the first part (15) and capable of limited axial slidable movement thereon, the second part (16) being engagable with the drill bit (12) to be rotatable with the drill bit (12) on rotation of the drill bit (12) in one direction and to be movably axially with the drill bit (12) the drill bit (12) being disengagable with the second part (16) to be able to be movable axially relative to the second part (16), flow passageways being provided between the drill bit and the second part to
    Type: Grant
    Filed: January 15, 1998
    Date of Patent: March 14, 2000
    Inventor: Ian Graeme Rear
  • Patent number: 5996714
    Abstract: A cutting bit has a bit body which has a forward end and a rearward end. The bit body contains a seat at the forward end thereof. The bit body contains a bore intersecting the seat wherein a bore wall defines the bore. A cutting insert is received by the seat wherein the cutting insert presents a side surface facing the bore. A wedge has a generally longitudinal seating surface. The wedge has a support surface opposite to the longitudinal seating surface. The wedge is received within the bore so that the longitudinal seating surface of the wedge contacts the side surface of the cutting insert and for at least a portion of the length of the wedge the entire support surface contacts the bore wall so as to frictionally retain the cutting insert in the seat.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: December 7, 1999
    Assignee: Kennametal Inc.
    Inventors: Ted R. Massa, Robert H. Montgomery, Jr., David R. Siddle, William P. Losch
  • Patent number: 5890551
    Abstract: A drill bit for percussive drilling includes a front surface in which cutting inserts are mounted. A recess is formed in the front surface, and a fluid channel extends through the drill bit for supplying flushing fluid to the recess. The recess is completely bordered by an endless land. Some of the cutting inserts are mounted in the land. Others of the cutting inserts are mounted in the recess in order to be cooled and flushed by a cushion of flushing fluid created in the recess.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: April 6, 1999
    Assignee: Sandvik AB
    Inventors: Per-Olof Liljebrand, Orban Olsson
  • Patent number: 5823274
    Abstract: A drill rod suitable for a hydraulic drilling apparatus, at the drilling end (I) of which there is a drilling device (1), that includes at least drilling equipment (2) and hammering equipment (5) as well as preferably flushing equipment (10) also, to drill a hole by use of the drilling equipment (2) by a feeding motion along the longitudinal axis (s) of the drilling device (1) and by a rotational motion (w) around the longitudinal axis (s) as well as by a to-and-from or a like hammering motion (t). The drilling device (1) has jointing equipment (3) for fastening of a drill rod (4) preferably in a removable way to increase the drilling depth of the drilling apparatus.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: October 20, 1998
    Assignee: Oy Winrock Technology, Ltd.
    Inventors: Risto Wisakanto, Harri Sjoholm
  • Patent number: 5794728
    Abstract: A rock drill bit for percussive drilling includes a head and a shank. The shank has a central boring in which a thread is provided. The thread cooperates with a corresponding thread in a drill string driven by a top hammer. The boring is connected to at least one fluid passage which emerges in or in the vicinity of a front face of the head. The fluid passage connects to a first groove which connects to a second groove, wherein at least three second grooves are provided and form between them axially forward lands. Each land carries a gauge insert. The gauge inserts are asymmetrically positioned on the drill bit, and the second groove extends radially inwards to or beyond an imaginary circle touching the radially innermost points of the inserts.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: August 18, 1998
    Assignee: Sandvik AB
    Inventor: Goran Palmberg
  • Patent number: 5590725
    Abstract: A drilling column has a percussive drilling head attached to a lower end thereof. The drilling column includes a skirt extending downwardly from a lower end thereof in surrounding relationship to the drilling head. The skirt is disposed in eccentric relationship to the drilling head, so that an enlarged space is formed at one side of the drilling head. An air duct arrangement extends through the drilling column for supplying compressed air to the drilling head. That compressed air exits the drilling head through a front face thereof and then flows upwardly through the enlarged space in the skirt and then travels through a discharge channel arrangement formed in the drilling column. In that way, cuttings entrained in the compressed air are removed upwardly from the drill hole. The drilling column is sealed-off with respect to the upper open end of the drill hole by a chuck pipe, enabling compressed air or liquid to be introduced from above ground into a gap surrounding the drilling column.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: January 7, 1997
    Inventor: Franz Blickhan
  • Patent number: 5494119
    Abstract: The obtaining of undisturbed core samples of subsurface soils for analysis and study is disclosed. Percussion-type downhole drilling equipment uses compressed air directed internally of a pipe casing to actuate a percussion-type piston adjacent the bottom of a hole being drilled. A tubular adapter is mounted in a chuck at the lower end of a casing and house the piston and the adapter for rotation and for longitudinal movement relatively thereto. The adapter has a striking face interfacing with the piston and has its opposite end provided with pipe threads for connection of an open-ended core sampler which is preferably of the split-spoon type. The adapter is provided with ports at a location spaced axially away from the core sampler for exhaust air released by the percussion means during a power stroke upwardly and thus away from the core sampler.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: February 27, 1996
    Inventor: Francis X. Tully
  • Patent number: 5407021
    Abstract: A down-the-hole hammer drill having a reverse circulation system which conducts pressurized air downwardly to a lower cutting face of a drill bit. The air travels across the cutting face and upwardly through a central exhaust passage. The air is conducted to the cutting face through longitudinal and lateral passages in the bit which are kept isolated from the environment surrounding the bit so that no appreciable amount of pressurized air can escape, and so that the passages do not become clogged with dirt. The drill bit comprises upper and lower pieces. Upper sections of the longitudinal passages are formed in the upper piece, and lower sections of the longitudinal passages are formed in the lower piece.
    Type: Grant
    Filed: April 8, 1993
    Date of Patent: April 18, 1995
    Assignee: Sandvik Rock Tools, Inc.
    Inventors: Robert F. Kane, Matthew Shofner, Faisal J. Yousef, Kenneth Ahlhorn
  • Patent number: 5377770
    Abstract: An impact tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground, and having passages and conduits opening to the front region of the tool to pass water to lubricate the tool and wet the soil proximate the front of the tool, to ease the passage of the tool through the soil during the propulsion of the tool.
    Type: Grant
    Filed: March 23, 1993
    Date of Patent: January 3, 1995
    Inventor: Lester L. Ritter
  • Patent number: 5366032
    Abstract: A rock bit is provided that comprises a generally cylindrical body with a leading end for boring in a rock formation and a trailing end for connection to a drill rod. The body has a generally cylindrical outside surface and comprises a plurality of parallel longitudinal grooves circumferentially spaced around the outside surface and extending from the leading end to the trailing end. The grooves have a depth that increases from the leading end to the trailing end such that the cross-sectional area of the grooves also increases towards the trailing end of the body of the bit. The body also comprises at least one channel machined in the outside surface of the body that extends between adjacent pairs of longitudinal grooves at an oblique angle to the grooves.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: November 22, 1994
    Inventor: Mark A. Kay
  • Patent number: 5291957
    Abstract: A high-speed fluid/mechanical Jet erosion system utilizing a high-velocity, spinning jet stream discharged contiguous the surface to be cut. The spinning jet stream is developed from a tangentially driven vortex flow system adapted to merge and enhance the erosive high-speed fluid jet characteristics of fluid and abrasive particle impingement erosion with cavitational collapse erosion in both axial and tangential directions. The system further includes an apertured mechanical cutting element which places the exiting spinning jet immediately against the target formation, providing maximum mechanical and fluid energy transfer to the formation. In this manner, the system induces formation fracturing by assisting mechanically induced fracture propagation with the high-speed jet action while simultaneously exploiting high-speed jet erosion-induced kerfs with the mechanical action of the tool.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: March 8, 1994
    Assignee: CCore Technology and Licensing, Ltd.
    Inventor: Harry B. Curlett
  • Patent number: 5199512
    Abstract: A high-speed fluid/mechanical jet erosion system utilizing a high-velocity, spinning jet stream discharged contiguous the surface to be cut. The spinning jet stream is developed from a tangentially driven vortex flow system adapted to merge and enhance the erosive high-speed fluid jet characteristics of fluid and abrasive particle impingement erosion with cavitational collapse erosion in both axial and tangential directions. The system further includes an apertured mechanical cutting element which places the exiting spinning jet immediately against the target formation, providing maximum mechanical and fluid energy transfer to the formation. In this manner, the system induces formation fracturing by assisting mechanically induced fracture propagation with the high-speed jet action while simultaneously exploiting high-speed jet erosion-induced kerfs with the mechanical action of the tool.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: April 6, 1993
    Assignee: CCore Technology and Licensing, Ltd.
    Inventor: Harry B. Curlett
  • Patent number: 5139099
    Abstract: An excavation tool, in which a device is provided which receives the striking force of a hammer and the rotational force of a hammer cylinder, in a bottom surface of which at least three axle holes are provided displaced from a center of the device and at equivalent angular intervals in the circumferential direction, block axles are inserted in the axle holes in a freely rotatable manner, blocks which are roughly fan-shaped and have bits embedded in the lead end surfaces thereof are provided at lead end parts of the block axles, so that left- and right-side faces of said blocks are in mutual opposition and arc parts of all blocks together form roughly a circle shape; and when said device is rotated in the direction of excavation, said blocks rotate as a result of the resistance to excavation of the bottom part of the excavation hole, one intersection part of the side faces and the arc part of each block protrudes beyond the outer circumferential surface of the device by a predetermined excavation amount, and
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: August 18, 1992
    Assignee: Mitsubishi Materials Corporation
    Inventors: Takeshi Hayashi, Shigeru Sato, Katsuaki Tsujimoto, Daishiro Miyazaki, Yoneo Hiwasa, Toshiki Ishimatsu, Kimiyo Wada
  • Patent number: 5085285
    Abstract: The present invention relates to a sacrificial compensating ring for a down hole hammer having an outer sleeve, a drive sub and a drill bit, wherein the sacrificial compensating ring has an outer diameter greater than that of the outer sleeve and substantially the same as that of the drill bit and the sacrificial compensating ring being located between the outer sleeve and the drive sub.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: February 4, 1992
    Assignee: D.T.A. Pty. Ltd.
    Inventors: John Elsby, John U. Dewar, Andrew Greathead, Brian T. Sanfead
  • Patent number: 5038874
    Abstract: A drill string for top hammer drilling includes a drill bit, a set of central rod members for transferring impact energy to the drill bit, and a set of tubular members surrounding the rod members for transferring rotation to the drill bit. The rod members define a first internal channel for conducting flushing medium. The drill bit defines a second internal channel which extends rearwardly and penetrates a rear end of the drill bit to communicate with the first channel. The drill bit further includes a transverse channel disposed in an intermediate section of the drill bit and which is connected to the second channel. The transverse channel penetrates an envelope surface of the drill bit for conducting flushing medium out of the drill bit and into an enlarged space defined between the drill bit and the tubular member.
    Type: Grant
    Filed: February 5, 1990
    Date of Patent: August 13, 1991
    Assignee: Sandvik AB
    Inventors: Lars K. Larsson, Sven P. Liljebrand