Impact Or Percussion Type Patents (Class 175/414)
  • Patent number: 9470043
    Abstract: An insert for a drill bit may include a metallic carbide body; an outer layer of polycrystalline diamond material on the outermost end of the insert, the polycrystalline diamond material comprising a plurality of interconnected first diamond grains and a first binder material in interstitial regions between the interconnected first diamond grains; and at least one transition layer between the metallic carbide body and the outer layer, the at least one transition layer comprising a composite of second diamond grains, first metal carbide particles, and a second binder material, wherein the first metal carbide particles form a matrix in which the second diamond grains are dispersed, wherein the first metal carbide particles are present in the at least one transition layer in an amount ranging from about 15 to 50 volume percent.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: October 18, 2016
    Assignee: Smith International, Inc.
    Inventors: Nephi M. Mourik, Peter T. Cariveau, Frederico Bellin, Yi Fang
  • Patent number: 9216555
    Abstract: A wear-resistant assembly, including: a surface; a base; and a plurality of wear-resistant attachments removably coupled to the base, each of the plurality of wear-resistant attachments including an inner portion and an outer portion, wherein the outer portion of each of the plurality of wear-resistant attachments is coupled to the outer portion of at least one other wear-resistant attachment so that a plurality of coupled wear-resistant attachments include a substantially continuous surface, the substantially continuous surface including at least a portion of the surface of the wear-resistant assembly.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: December 22, 2015
    Assignee: SCOPERTA, INC.
    Inventors: John H. Madok, Justin Cheney, Kenneth S. Vecchio
  • Patent number: 9016408
    Abstract: The invention concerns a drill bit, intended to be used with a down-the-hole drill and comprising a drill head (2) with a front surface provided with drill pins (3) and a shaft (4), whereby the shaft is narrower than the drill head and intended to be inserted in a manner that allows axial sliding into the end of a drill chuck that is a component of a down-the-hole drill and which shaft has a rear end part (6) that is somewhat thickened with a plane striking surface (7) against which a hammer piston (8) that is a component of the down-the-hole hammer drill is arranged to impact, that the drill head when viewed along its axial direction has a cylinder-shaped forward part (20) provided with cuttings channels (22), a rear cylinder-shaped part (21) that is located for the reception of drill cuttings at the same level or somewhat below the bottom (25) of the cuttings channels, whereby the diameter (D1) of the forward part is greater than the diameter (D2) of the rear part.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: April 28, 2015
    Assignee: LKAB Wassara AB
    Inventors: Magnus Hörman, Peter F. Johansson
  • Patent number: 8985245
    Abstract: The present invention relates to a drill bit assembly for fluid-operated percussion drill tools comprising a percussion bit (1) having a head portion (3) formed with an axially extending stub shank (32); axially extending splines (36) on the stub shank (32) slideably engageable with complementary splines (35) formed on a drive chuck (4) whereby rotational drive from the chuck (4) may be transmitted to the stub shank (32); bit retaining means adapted for engagement with complementary retaining means on the stub shank to retain the stub shank in the drill bit assembly; and engagement means on the chuck (4) adapted for connecting the chuck (4) to a drive means (5) of the fluid-operated percussion drill tool. The bit retaining means comprises a bit retaining ring (41), and the complementary retaining means comprises a retaining shoulder (37) on the stub shank, wherein the bit retaining ring is arranged to engage the retaining shoulder to retain the stub shank in the drill bit assembly.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: March 24, 2015
    Assignee: Mincon International
    Inventor: Joseph Purcell
  • Patent number: 8973681
    Abstract: A pressurized fluid flow system for a reverse circulation down-the-hole hammer includes a cylinder and a cylindrical control tube that are respectively coaxially disposed in between the outer casing and the piston of the hammer and in between the piston and the sample tube. Two chambers help to respectively supply and discharge pressurized fluid into and out of the front and rear chambers that exert work on the piston: an internal chamber, defined by a central recess in the inner surfaces of the piston and permanently connected to the source of pressurized fluid, and a discharge chamber, defined by one or more recesses in the inner surface of the outer casing and permanently communicated with the bottom of the hole. A hammer provided with this system has one or more end discharge ports connected to respective longitudinal discharge channels formed on the outer surface of the outer casing.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: March 10, 2015
    Assignee: Drillco Tools S.A.
    Inventor: Jaime Andrés Aros
  • Publication number: 20140367175
    Abstract: The present disclosure describes various embodiments, as well as features and aspects thereof, of an improved drill bit assembly for a percussion boring system. More specifically, one non-limiting embodiment of an improved drill bit assembly for a percussion boring system comprises a bit and a chuck. The bit head comprises a slant face. The chuck comprises at least thirteen splines. This improved drill bit assembly is such that when the chuck is fully threaded onto the percussion boring system, and when the bit is detachably received by the chuck, the slant face of the bit is aligned to substantially within an average range of 0.00-27.70 arcseconds of an alignment reference point on the surface of the percussion boring system.
    Type: Application
    Filed: September 2, 2014
    Publication date: December 18, 2014
    Inventor: CARY COOPER
  • Patent number: 8910729
    Abstract: An apparatus for drilling a hole in the ground has a hammer drill installed at a bottom of a rod assembled in multi-stages at support structure on the ground. The hammer drill has a pilot hammer drill and a reamer hammer drill coupled to each other through a key structure formed in the vertical direction so as to allow simultaneous rotations and up-and-down movements relative to each other.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: December 16, 2014
    Assignee: Core Geotechnics Co., Ltd.
    Inventor: Sun Keun Park
  • Patent number: 8899356
    Abstract: A roof-bolt drill bit may have a forward end, a rearward end, and a rotational axis extending between the forward end and the rearward end. A cutting element for the roof-bolt drill bit may include a cutting face and a peripheral surface extending around an outer periphery of the cutting face. The cutting element may include at least one chamfer region and a peripherally extending chamfer extending from the at least one chamfer region along the outer periphery of the cutting element, a width of the at least one chamfer region being greater than a width of the peripherally extending chamfer.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: December 2, 2014
    Assignee: Dover BMCS Acquisition Corporation
    Inventor: Russell Roy Myers
  • Publication number: 20140345953
    Abstract: A bit for a percussive hammer includes an elongated shank, a head at a first end of the shank, and an array of lengthwise extending spline portions defining outwardly extending retention lugs at or toward a further end of the shank. At least a side face of at least one lug is blended into the shank of the bit.
    Type: Application
    Filed: December 7, 2012
    Publication date: November 27, 2014
    Applicant: Sandvik Intellectual Property AB
    Inventors: Conny Seppala, Tomas Sh Jansson
  • Patent number: 8783383
    Abstract: A device used to break rock from within a predrilled borehole through the use of impact pins which strike against the interior sides of a drilled hole. The device is loaded into a drilled hole and then activated by a percussive hammer located above the hole, providing percussive energy to the device which is then transferred to the sidewall of the drilled hole. The device includes an inner piston assembly which includes a driving surface for causing impact pins to strike the interior sidewall of the drilled hole in a rapid percussive manner so as to greatly improve the ability to break and shatter surrounding rock or concrete.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: July 22, 2014
    Inventor: Jeffrey S. Senules
  • Patent number: 8763729
    Abstract: A hammer bit for drilling a borehole in earthen formations includes a bit body having a bit axis and a bit face, a plurality of gage cutter elements mounted to the bit face in a circumferential gage row, and a plurality of adjacent to gage cutter elements mounted to the bit face in a circumferential row that is radially adjacent the gage row. The ratio of the radial overlap distance to the radial span distance between radially overlapping gage cutter elements and adjacent to gage cutter elements is greater than 0.25. The ratio of the radial overlap distances to the diameter of the gage cutter element is greater than 0.25. An average cutting area of the gage cutter elements per gage cutter element is less than an average surface area of an entire cutting surface of each of the gage cutter elements.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: July 1, 2014
    Assignee: Smith International, Inc.
    Inventors: Shantanu Swadi, Angelo Spedale, Charles Dewey, Alan J. Marshall
  • Patent number: 8640794
    Abstract: A pressurized fluid flow system for a normal circulation down-the-hole hammer comprises a cylinder coaxially disposed in between an outer casing and a piston which reciprocates due to changes in pressure of pressurized fluid contained inside a front chamber and rear chamber located at opposites sides of the piston, supply/discharge of fluid to/from these chambers being conducted through a supply chamber and a discharge chamber defined by recesses on the inner surface of the casing and separated by a dividing wall, the front/rear chambers' in/out fluid flow being controlled solely by the overlap of the piston and the cylinder. A hammer having this system comprises a drill bit with one or more flushing passages which extend from channels cooperatively formed between splines on the inner surface of the driver sub and on the outer surface of the drill bit shank up to the front face of the drill bit.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: February 4, 2014
    Assignee: Drillco Tools S.A.
    Inventor: Jaime Andrés Aros
  • Patent number: 8636088
    Abstract: A rock drilling machine and an axial bearing module. The rock drilling machine is equipped with an axial bearing having at least one axial piston for axially positioning a drill shank and for damping stress pulses returning from the rock. The axial bearing includes a module that is detachable in one piece from one installation direction. The axial bearing module includes the required pressure medium channels, seals, bearing surfaces, and a module frame having at least bearing housing in connection therewith.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: January 28, 2014
    Assignee: Sandvik Mining and Construction Oy
    Inventors: Timo Muuttonen, Lars Kandelin, Pekka Saukko
  • Publication number: 20130327576
    Abstract: The invention provides a drill bit for a down-the-hole drill hammer. The bit has a head at its forward end with a shank extending from the head. The shank is screw threaded along its length. A reciprocating chuck is provided as a sleeve with internal screw threads corresponding to those of the shank. The shank is releasably secured in the chuck with the rear end of the shank providing a striking face. An arrangement of external splines on the chuck, and a retaining shoulder at its rear end, provide for the required guided movement of the chuck within a drill hammer wear sleeve. The bit is simple to machine with screw threads replacing the usual splines and other structural features ordinarily required on this component. These features are instead provided on the chuck and in the wear sleeve.
    Type: Application
    Filed: April 1, 2013
    Publication date: December 12, 2013
    Inventor: Bernard Lionel Gien
  • Patent number: 8590642
    Abstract: A percussion hammer bit retention system including a retainer having at least three (3) tabs, a hammer bit having first and second elevated surfaces that each define pathways and slot openings for rotational receipt of the tabs, and a custom chuck further including slot openings for receipt of the tabs. The application of tabs in combination with the elevated surfaces and indexed slot openings distinguish the present invention over the prior art. In application, in order to fully separate the retainer from the assembly, the tabs are indexed in a manner that only allows them to pass through the aligned slot openings on the first elevated surface in one (1) position every 360 degrees, and then through the aligned slot openings on the second elevated surface in one (1) position every 360 degrees, and then through the indexed slots on the custom chuck in one (1) position every 360 degrees.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: November 26, 2013
    Inventors: Danny Robey, Todd Taylor
  • Patent number: 8544566
    Abstract: A fluid-actuated percussive impact tool includes a drill bit disposed partially within a casing for respective longitudinal movement between extended and retracted positions. A bearing having a bore is fixedly disposed within the casing. A piston is located in the chamber and a second end thereof is configured to selectively enter the bore of the bearing through the first end to impact the first end of the drill bit. At least one groove is formed in an exterior surface of the piston proximate the second end thereof. The tool has a sealed position when the drill bit is in the extended position wherein a water seal is formed between an interior surface of the bearing and a portion of the exterior surface of the piston between the first end of the piston and the first end of the at least one groove.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: October 1, 2013
    Assignee: Eastern Drillers Manufacturing, Inc.
    Inventor: Michael Mulligan
  • Publication number: 20130180784
    Abstract: A rock drill bit for percussive drilling includes a bit head attached at an end of a drill element of a drilling assembly. The bit head has a diameter larger than that of the drill element. The bit head has at a front end as seen in the intended drilling direction a plurality of buttons distributed thereon to engage material to be crushed. At least one of the buttons is allowed to rotate about its own symmetry axis.
    Type: Application
    Filed: September 16, 2011
    Publication date: July 18, 2013
    Applicant: SANDVIK INTELLECTUAL PROPERTY AB
    Inventors: Mauri Esko, Markku Keskiniva, Juha Piispanen
  • Patent number: 8347988
    Abstract: A down-hole hammer comprising a drill bit (10) and a drive collar (11) with an interconnection therebetween for causing rotation of the drill bit upon rotation of the drive collar. The drill bit (10) comprises a drill bit head (13) and a shank (19), the drill bit head (13) defining a cutting face (15) and having a circumferential shoulder section (17) adjacent the cutting face (15). The shank (19) extends from the shoulder section (17) in the direction away from the cutting face (15). The interconnection between the drill bit (10) and the drive collar (11) comprises a spline assembly including at least one spline (43) on the shoulder section (17) for mating engagement with at least one counterpart spline (63) on the drive collar (11) to provide a drive coupling therebetween while also allowing the drill bit (10) to slide axially within the drive collar (11) to perform a percussive action.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: January 8, 2013
    Inventors: Andrew S. Gilbert, Barry J Thompson
  • Patent number: 8312944
    Abstract: A percussion drilling assembly for boring into the earth. In an embodiment, the assembly comprises a tubular case having a central axis, an upper end, and a lower end. In addition, the assembly comprises a piston slidingly disposed within the tubular case. Further, the assembly comprises a driver sub coaxially coupled to the lower end of the tubular case. The driver sub includes an upper end disposed within the case and a lower end extending axially from the lower end of the case. Still further, the assembly comprises a hammer bit coaxially disposed within the driver sub. The hammer bit including an upper end disposed within the driver sub and a lower end extending from the lower end of the driver sub. The upper end of the driver sub extends axially from the upper end of the hammer bit and is adapted to receive the piston.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: November 20, 2012
    Assignee: Smith International, Inc.
    Inventors: Alan J. Marshall, Shantanu Swadi, Michael Krauel
  • Publication number: 20120186878
    Abstract: A downhole tool including a fluid-actuated piston and a motor-driven valve. The fluid-actuated piston is operatively associated with a reciprocating mass. The motor-driven valve is configured to supply actuating fluid sequentially to drive the piston downwards and upwards. A method of reciprocating a mass in a downhole tool. The method including cycling a motor-driven valve between a first configuration and a second configuration. In the first configuration actuating fluid pressure drives a piston associated with the mass downwards. In the second configuration actuating fluid pressure drives the piston upwards.
    Type: Application
    Filed: January 20, 2012
    Publication date: July 26, 2012
    Applicant: NOV DOWNHOLE EURASIA LIMITED
    Inventor: Alan Martyn Eddison
  • Publication number: 20120145464
    Abstract: The invention provides for a down-the-hole drill bit assembly comprising a drill bit having a screw-thread at its anvil end, external splines on the drill shank and co-operating splines within a drill casing as well as a co-operating screw thread carried by a component within the casing. The assembly is arranged to have engagement of the splines with the screw threads disengaged for driving the drill and to have the screw threads engaged and splines disengaged to permit removal of the bit from the assembly.
    Type: Application
    Filed: August 5, 2010
    Publication date: June 14, 2012
    Inventor: Bernard Lionel Gien
  • Publication number: 20120125691
    Abstract: A modular drilling system including a plurality of different size drill bits which can be interchangeably mounted on a common tapered male connecting portion of a drill rod assembly. The tapered male connecting portion may be formed directly onto a tapered drill rod of the assembly or may be formed on an adapter which is threaded onto a threaded drill rod of the assembly. Each bit includes a female connecting portion having a generally cylindrical tapered surface mating with a corresponding tapered surface of the male connecting portion and at least three planar sections adapted to provide positive engagement with corresponding planar sections of the male connecting portion.
    Type: Application
    Filed: July 14, 2011
    Publication date: May 24, 2012
    Inventor: George Johan Strydom
  • Publication number: 20120023833
    Abstract: In one aspect of the present invention, a high impact resistant tool comprises a sintered polycrystalline diamond body bonded to a cemented metal carbide substrate at an interface, the body comprising a substantially pointed geometry with an apex, the apex comprising a curved surface that joins a leading side and a trailing side of the body at a first and second transitions respectively, an apex width between the first and second transitions is less than a third of a width of the substrate, and the body also comprises a body thickness from the apex to the interface greater than a third of the width of the substrate.
    Type: Application
    Filed: October 5, 2011
    Publication date: February 2, 2012
    Inventors: David R. Hall, Ronald B. Crockett, Casey Webb, Michael Beazer
  • Publication number: 20120012399
    Abstract: The invention concerns a drill bit, intended to be used with a down-the-hole drill and comprising a drill head (2) with a front surface provided with drill pins (3) and a shaft (4), whereby the shaft is narrower than the drill head and intended to be inserted in a manner that allows axial sliding into the end of a drill chuck that is a component of a down-the-hole drill and which shaft has a rear end part (6) that is somewhat thickened with a plane striking surface (7) against which a hammer piston (8) that is a component of the down-the-hole hammer drill is arranged to impact, that the drill head when viewed along its axial direction has a cylinder-shaped forward part (20) provided with cuttings channels (22), a rear cylinder-shaped part (21) that is located for the reception of drill cuttings at the same level or somewhat below the bottom (25) of the cuttings channels, whereby the diameter (D1) of the forward part is greater than the diameter (D2) of the rear part.
    Type: Application
    Filed: December 17, 2009
    Publication date: January 19, 2012
    Applicant: Wassara AB
    Inventors: Magnus Hörman, Peter F. Johansson
  • Publication number: 20110253458
    Abstract: A percussion hammer bit retention system including a retainer having at least three (3) tabs, a hammer bit having first and second elevated surfaces that each define pathways and slot openings for rotational receipt of the tabs, and a custom chuck further including slot openings for receipt of the tabs. The application of tabs in combination with the elevated surfaces and indexed slot openings distinguish the present invention over the prior art. In application, in order to fully separate the retainer from the assembly, the tabs are indexed in a manner that only allows them to pass through the aligned slot openings on the first elevated surface in one (1) position every 360 degrees, and then through the aligned slot openings on the second elevated surface in one (1) position every 360 degrees, and then through the indexed slots on the custom chuck in one (1) position every 360 degrees.
    Type: Application
    Filed: April 14, 2011
    Publication date: October 20, 2011
    Inventors: Danny Robey, Todd Taylor
  • Patent number: 7975784
    Abstract: A drill bit assembly for fluid-operated percussion drill tools. The assembly comprises a percussion bit (1) having a head portion (3) formed with an axially extending stub shank (32). A drive bush (2) is releasably connectable to the bit head portion (3). Axially extending splines (35) on the drive bush (2) are slideably engageable with complementary splines (36) formed on a drive chuck (4) whereby rotational drive from the chuck (4) may be transmitted to the drive bush (2). The assembly further comprises engagement means on the chuck (4) adapted for connecting the chuck (4) to a drive means (5) of the fluid-operated percussion drill tool.
    Type: Grant
    Filed: January 4, 2007
    Date of Patent: July 12, 2011
    Assignee: Minroc Technical Promotions Limited
    Inventor: Joseph Purcell
  • Patent number: 7942216
    Abstract: A drill rod has a fitting portion protruding toward the distal end of the drill rod. The drill rod fitting portion further encompasses a parallel male thread portion in which a minimum distance from a first axial line in a cross-section perpendicular to the first axial line is constant; and a male thread ending portion is continuous with a proximal end of the parallel male thread portion. The minimum distance of the ending portion increases as a proximal end is approached. Furthermore, the fitting portion is formed such that the minimum distance does not decrease as the proximal end is approached from a distal end thereof. Additionally, the proximal end of the male thread ending portion is positioned where a distance from the first axial line gradually increases as the proximal end of the male thread ending portion is approached from the parallel male thread.
    Type: Grant
    Filed: November 21, 2006
    Date of Patent: May 17, 2011
    Assignees: Mitsubishi Materials Corporation, Furukawa Rock Drill Co., Ltd.
    Inventors: Masaya Hisada, Masahiro Koizumi, Takashi Suzuki
  • Patent number: 7938205
    Abstract: The invention relates to a boring head for a ground-boring device displacing earth with a percussive action, comprising at least three boring head sections, of which the first section has a form optimized for the loosening and for guiding the device, the second section is optimized with regard to the radial displacement of the earth with low resistance to motion, and the third section has a fixed connection to the housing of the ground-boring device. Improved transmission of the advancing forces to the earth and consequently an improved advance of the ground-boring device can be achieved by at least two of the boring head sections being designed so as to be axially movable relative to one another in the longitudinal direction.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: May 10, 2011
    Assignee: Tracto-Technik GmbH
    Inventor: Franz-Josef Püttmann
  • Publication number: 20110067928
    Abstract: A bottom-hole assembly (202), BHA, for drilling a borehole (204, 301) in an earth formation (208, 300), comprising a percussion drill bit (208), a percussion mechanism adapted to strike the drill bit (208), at least one sensor (226, 228, 230, 232, 234) for measuring a physical quantity and converting it into an electrical signal, and converting means (237) for converting the electrical signal into a digital signal, and a method for transmitting data from such a bottom-hole assembly (202) positioned in a borehole (204, 301), the bottom-hole assembly (202) and the method being characterized by encoding the digital signal by controlling the percussion mechanism and time periods between two impacts delivered by the percussion mechanism on the drill bit (208) during drilling, and transmitting the encoded digital signal by waves generated by the impacts delivered by the percussion mechanism on the drill bit (208). A system which comprises said bottom-hole assembly (202).
    Type: Application
    Filed: May 11, 2009
    Publication date: March 24, 2011
    Inventors: Jarl Huldén, Ivo Henriksson
  • Publication number: 20110042146
    Abstract: This invention relates to a percussion drill bit head for a percussion drilling apparatus, the drill bit head comprising a working surface and a plurality of super-hard buttons protruding from the working surface, the working surface having a hard area that is free of buttons and has Rockwell C hardness of at least 60 HRc. The invention further relates to a method of manufacturing a percussion drill bit head comprising a working surface and a plurality of buttons and a percussion drill bit assembly comprising a drill bit head according to the invention.
    Type: Application
    Filed: May 11, 2009
    Publication date: February 24, 2011
    Inventors: Frank Friedrich Lachmann, Gerald F. Flynn, Karl Georg Hildebrand
  • Patent number: 7882908
    Abstract: A drill, which is used in a hammer drill for drilling holes in stone, concrete and the like, includes a one-piece drilling head (10, 20, 30) formed of a hard material and provided, at its first end (5), with at least one main bit having a tip (4) and at least one cutting structure (3) integral to the one-piece drilling head (10; 20; 30), and at a second end (6) located opposite the first end (5), with a bottom surface (7) for the mounting the drilling head (10; 20; 30) on the drill stem (8), and having a plurality of axially extending through-grooves (11; 21; 31) for removing drillings produced during a drilling process and having a cross-section which increases, at least regionwise, in a direction toward the bottom surface (7) of the drilling head (10; 20; 30).
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: February 8, 2011
    Assignee: Hilti Aktiengesellschaft
    Inventors: Olaf Koch, Joachim Woerz, Karl-Heinz Hofmann, Werner Britten
  • Patent number: 7832504
    Abstract: A bit assembly is for a percussive drill that includes a casing with an interior chamber and includes a bit connectable with the casing and having a longitudinal bore and an axis through the bore. The bore has a retainer portion with one or more generally conical inner surfaces extending circumferentially about and facing generally toward the axis. A generally cylindrical valve has a longitudinal passage with an inlet fluidly connectable with the casing chamber and an outlet fluidly connectable with the bit central bore and an axis through the passage. An engagement portion with at least one generally conical outer surface extends circumferentially about and faces generally away from the valve axis. The valve engagement portion is disposable within the bit bore retainer portion such that the valve conical outer surface is disposed within and against the bit conical inner surface to retain the valve coupled with the bit.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: November 16, 2010
    Assignee: Atlas Copco Secoroc LLC
    Inventors: Dale R. Wolfer, Timothy J. Plunkett, Leland H. Lyon
  • Publication number: 20100243333
    Abstract: The present invention relates to a drill bit assembly for fluid-operated percussion drill tools. The assembly comprises a percussion bit (1) having a head portion (3) formed with an axially extending stub shank (32). A drive bush (2) is releasably connectable to the bit head portion (3). Axially extending splines (35) on the drive bush (2) are slideably engageable with complementary splines (36) formed on a drive chuck (4) whereby rotational drive from the chuck (4) may be transmitted to the drive bush (2). The assembly further comprises engagement means on the chuck (4) adapted for connecting the chuck (4) to a drive means (5) of the fluid-operated percussion drill tool. The invention also relates to a down-the-hole hammer comprising an external cylindrical outer wear sleeve (5) and a sliding piston (8) mounted for reciprocating movement within the outer wear sleeve (5) to strike a percussion bit (1) of a drill bit assembly located at the forward end of the outer wear sleeve (5).
    Type: Application
    Filed: January 4, 2007
    Publication date: September 30, 2010
    Inventor: Joseph Purcell
  • Publication number: 20100236832
    Abstract: A percussive drill bit provided with an improved chuck assembly for a down-the-hole drill hammer. The bit has a head at its forward end with a shank extending from the head. The shank is screw threaded along its length. A reciprocating chuck is provided as a sleeve with internal screw thread as corresponding to those of the shank. The shank is releasably secured in the chuck with the read end of the shank providing a striking face. An arrangement of external splines on the chuck, and a retaining shoulder at its rear end, provide for the required guided movement of the chuck within a drill hammer wear sleeve.
    Type: Application
    Filed: May 10, 2010
    Publication date: September 23, 2010
    Inventor: Bernard Lionel GIEN
  • Publication number: 20100175928
    Abstract: A hammer bit includes a bit body coupled to a hammer drill, a housing bit disposed to the bit body, at least one wing bit coupled to the housing bit to move up and down slantly, and having a rotating radius that is more increased than an outer surface of the bit body when moving up and is more decreased than the outer surface of the bit body when moving down, and at least one spacer installed to move up and down together with the wing bit and filling up an upper space of the wing bit when the wing bit moves down.
    Type: Application
    Filed: May 20, 2008
    Publication date: July 15, 2010
    Inventor: Kwang Ik Lee
  • Patent number: 7673706
    Abstract: A down-the-hole hammer includes a piston movably disposed in a casing and a percussion bit at an end of the casing. The percussion bit includes an integral bit and shank and a pilot removably fastened at a forward end of the bit. A method of enlarging a preexisting hole is also provided.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: March 9, 2010
    Assignee: Sandvik Intellectual Property AB
    Inventor: Rob A. Simmons
  • Patent number: 7624822
    Abstract: A thread joint for transmitting percussive forces includes a male thread on a male member and a female thread on a female member. The male member includes a first portion including an outer surface having a maximum first outer cross section, a second portion having a second maximum outer dimension, and a third portion having the male thread formed thereon. The second portion is disposed axially between the first and third portions. The male thread includes a thread start and a thread end. The third portion terminates in an axially facing first end surface. The female member has a recess in which the female thread is formed, the female thread having a mouth defined by a ring-shaped second end surface. The recess includes a cylindrical inner surface disposed between the second end surface and the female thread. The inner surface faces the cylindrical center portion of the male member.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: December 1, 2009
    Assignee: Sandvik Intellectual Property AB
    Inventors: Urban Olsson, Monica Olsson, legal representative, Per-Olof Liljebrand
  • Publication number: 20090152014
    Abstract: The present invention A relates to a female part intended for top hammer-drilling equipment and a method for manufacturing female parts. The female part has a thread in the form of a ridge (2) in a wall (5). The ridge is delimited by a crest (9) and two flanks (10) between which a likewise helical groove (11) having a bottom (12) runs. An end the of the groove (11) is defined by a borderline (18), which separates the groove bottom (12) from a part surface (19) formed in the inside of the wall (5), the width of which part surface successively decreases in the peripheral direction, and which has a rotationally symmetrical shape essentially similar to the rotationally symmetrical basic shape of the thread (1).
    Type: Application
    Filed: May 11, 2007
    Publication date: June 18, 2009
    Applicant: Sandvik Intellectual Property AB
    Inventors: Peter Nava, Peter Sörensen
  • Patent number: 7546888
    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 repetitive axial percussive impacts on the drill bit in a direction having a component along the axis and by applying rotary motion about the axis relative to the earth formation. The drill bit is provided with one or more axial cutters for predominantly axially cutting the subterranean earth formation in response to the axial percussive impacts and one or more shear cutters for predominantly shear cutting the subterranean earth formation in response to the rotary motion. There is a first shear cutter of the one or more shear cutters, and one or more of the axial cutters are arranged with respect to the first shear cutter to engage with the subterranean earth formation earlier during a percussive impact than the first shear cutter.
    Type: Grant
    Filed: June 11, 2004
    Date of Patent: June 16, 2009
    Assignee: Shell Oil Company
    Inventor: Antonio Maria Guimaraes Leite Cruz
  • Publication number: 20090066149
    Abstract: In one aspect of the present invention, a high-impact resistant pick has a superhard material bonded to a cemented metal carbide substrate at a non-planar interface. The cemented metal carbide substrate is bonded to a front end of a cemented metal carbide bolster. A bore formed in a base end of the carbide bolster is generally opposed to the front end. A steel body has a steel shaft fitted into the bore of the bolster at an interface. A shank adapted for connection to a driving mechanism extends from the steel body opposite the shaft. A washer is disposed intermediate the base end of the carbide bolster and a shelf of the steel body.
    Type: Application
    Filed: September 7, 2007
    Publication date: March 12, 2009
    Inventors: David R. Hall, Ronald B. Crockett
  • Patent number: 7428938
    Abstract: A drive collar is disclosed for use in a percussion drilling apparatus of the type for boring into the earth. Embodiments of the drive collar include a generally tubular, one-piece body further having an inner surface, an outer surface, a first end and a second end. Embodiments further include a threaded section on the outer surface, a retention mechanism on the inner surface, a plurality of splines on the inner surface; and a shoulder on the outer surface.
    Type: Grant
    Filed: March 15, 2006
    Date of Patent: September 30, 2008
    Assignee: Smith International, Inc.
    Inventor: Alan J. Marshall
  • Patent number: 7419017
    Abstract: A multi-sectional percussive drill bit assembly for drilling holes in earth formation primarily used in conjunction with a pneumatic percussive device. The drill bit assembly is comprised of an easily removable bit that is rotationally driven by a lug and pocket structure and axially limited in travel by means of retaining members.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: September 2, 2008
    Assignee: Keystone Drill Services, Inc.
    Inventors: Thomas A. Walker, Richard Smith, Stephen R. Means
  • Patent number: 7419018
    Abstract: In one aspect of the invention, a downhole drill string component has a shaft being axially fixed at a first location to an inner surface of an opening in a tubular body. A mechanism is axially fixed to the inner surface of the opening at a second location and is in mechanical communication with the shaft. The mechanism is adapted to elastically change a length of the shaft and is in communication with a power source. When the mechanism is energized, the length is elastically changed.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: September 2, 2008
    Inventors: David R. Hall, Scott Dahlgren, Tyson J. Wilde
  • Publication number: 20080197691
    Abstract: In one aspect of the invention, a degradation assembly comprises an impact tip brazed to a carbide bolster. A stem protrudes from the bolster, being adapted to be retained within a bore connected to a driving mechanism. A locking fixture is disposed within the bore and locking the stem to a wall of the bore.
    Type: Application
    Filed: April 30, 2008
    Publication date: August 21, 2008
    Inventors: David R. Hall, Scott Dahlgren
  • Patent number: 7392863
    Abstract: The present invention relates to a rock drill bit for percussive drilling. The drill bit comprises a bit body; a head portion defining a longitudinal center axis. The head portion comprises a front face having an outer surface portion, and an inner surface portion disposed radially inside of the outer surface portion. The inner surface portion is partially recessed by a cavity with respect to the outer surface portion. A plurality of fluid channels extends through the head portion and communicates with the cavity for conducting a flushing medium thereto. The inner surface portion comprises a raised portion carrying a plurality of buttons. An imaginary circle intersects centers of the fluid channels and also intersects an equal number of buttons.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: July 1, 2008
    Assignee: Sandvik Intellectual Property AB
    Inventor: Fredrik Björk
  • 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
  • Publication number: 20080087473
    Abstract: A percussive drill bit has a working face opposite a shank end. The working face has a central jack insert and a plurality of peripheral inserts extending from the working face. The ends of the plurality of the peripheral inserts form an impacting plane. The central jack insert is disposed within a recessed portion of the working face and has an end extending between the working face and the impacting plane.
    Type: Application
    Filed: October 13, 2006
    Publication date: April 17, 2008
    Inventors: David R. Hall, Ronald Crockett, Joe Fox, John Bailey
  • Patent number: 7325633
    Abstract: A drill bit intended for percussive rock drilling is formed to reduce the occurrence of cavitation during percussive drilling. The drill bit includes an integral skirt and at least one channel for transport of flush medium, such as water. The drill bit has a front face provided with buttons, which define a greatest first external diameter (D0). A recess with a female thread, such as a rope or trapezoid thread for percussive drilling, extends into the drill bit from a rear end face of the drill bit. The recess has an axial depth (L0). The external surface of the skirt includes a conical portion having an axial extension that is greater than one-eighth of the depth (L0) of the recess but smaller than the depth (L0) of the recess.
    Type: Grant
    Filed: August 17, 2005
    Date of Patent: February 5, 2008
    Assignee: Sandvik Intellectual Property AB
    Inventors: Johan Lindén, Bo Carlström
  • Patent number: 7281594
    Abstract: The present invention relates to a rock drill bit for percussive drilling. The drill bit comprises a bit body, a head portion defining a longitudinal center axis. The head portion includes an axially forward rock-crushing surface and a skirt that extends axially rearwardly from the rock-crushing surface. The rock-crushing surface comprises several rock-crushing means. A circumferential outer surface of the skirt is provided with circumferentially spaced apart grooves forming lands therebetween. The grooves and the lands extend generally in an axial direction. An axially rearward portion of a land is provided with a guiding surface. The guiding surface faces radially outwardly. The guiding surface comprises at least one step or a sloping surface such to reduce the diametrical dimension stepwise or continuously, respectively. The guiding surface comprises a first guiding portion and a second guiding portion both situated radially outside of an imaginary extension line of the waist.
    Type: Grant
    Filed: November 16, 2005
    Date of Patent: October 16, 2007
    Assignee: Sandvik Intellectual Property AB
    Inventor: Per-Ola Hadin
  • Patent number: 7185721
    Abstract: A male portion for percussive rock drilling includes sections of reduced cross-sectional area. At least one thread for percussive rock drilling is provided at an end of the male portion. The end of the male portion comprises an abutment surface for the transfer of impact waves. The length of the portion is defined as the length of an imaginary cylinder from a plane of the impact surface to a point where the plane ceases to contact a crest of the thread, wherein the length divided by the external diameter of the cylinder lies within a range of 1–2.
    Type: Grant
    Filed: June 26, 2003
    Date of Patent: March 6, 2007
    Assignee: Sandvik Intellectual Property AB
    Inventors: Bo Carlström, Anders Brungs, Christer Lundberg, Per-Olof Liljebrand