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| Number | Title | Issue Date |
| 7712554 | Percussive drill bit provided with an improved chuck assembly 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 ... | 05/11/2010 |
| 7441611 | Pneumatic rock drill A pneumatic rockdrill having a housing; a cylinder connected to a compressed air supply inlet by a set of air passages; an impact piston, at least part of which is reciprocable within the cylinder; and a controller for the supply of compressed air from the air suppl... | 10/28/2008 |
| 7410013 | Boring and drilling apparatus 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 cuttin... | 08/12/2008 |
| 7392857 | Apparatus and method for vibrating a drill bit In one aspect of the invention a drill bit comprises an axis of rotation a body and a working face. The body comprises a fluid passageway with a first seat and houses a jack element substantially coaxial with the axis. A stop element is disposed within the passagewa... | 07/01/2008 |
| 7392863 | Rock drill bit 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 d... | 07/01/2008 |
| 7325633 | Rock drill bit and a thread joint therefor 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 f... | 02/05/2008 |
| 7320566 | Cutting tool including detachable cutter head A cutting tool including a cutter head and a holder. One of the cutter head and the holder has a recess formed in its axial end portion and defined by its circumferential wall. The other of the cutter head and the holder has a protrusion formed in its axial end port... | 01/22/2008 |
| 7290626 | Transmission sleeve The invention is a transmission sleeve for the reverse circulation down hole hammer activated by fluid under pressure, the hammer including an outer hammer casing, a drill bit retaining means (17) and a drill bit (10) retaining means (17) and ex... | 11/06/2007 |
| 7284623 | Method of drilling a bore hole A method for drilling a borehole through a production zone underlying an overburden of various earth formations includes drilling the borehole through the overburden with a first drill bit. The first drill bit being selected to optimize at least one drilling perform... | 10/23/2007 |
| 7258179 | Rotary bit with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 08/21/2007 |
| 7223049 | Apparatus, system and method for directional degradation of a paved surface An apparatus, system and method for directionally degrading a paved surface. A substantially cylindrical rotary tool may include cutting inserts embedded within its cylindrical surface. The tool may be rotated about a rotational axis extending from a top end of the ... | 05/29/2007 |
| 7159676 | Fluid distributor device for down-hole-drills A fluid distributor device is for a percussive drill assembly including a generally tubular casing (2) having a longitudinal centerline and a piston (6) disposed within the casing so as to define a reservoir chamber (27) in the casing. The distr... | 01/09/2007 |
| 7143846 | Method for drilling and drilling apparatus to enable reverse circulation The invention relates to a method for drilling, being carried out by a drilling apparatus, having a drilling device (1) that comprises a casing part (2) and a drilling unit (3), in the drilling head (I) of which there are first drilling means ( | 12/05/2006 |
| 7137462 | Drill bit A drill bit constructed to improve a tip end of the cutting pointed portion to efficiently discharge chips from a center portion of a crush face of a drill hole to thereby improve cutting efficiency, is disclosed. A plurality of cutting blades 3a, 3... | 11/21/2006 |
| 7128172 | Drill string for upward drilling and components therefor A rock drill includes a housing in which are disposed a reciprocable percussive device, slidably mounted in the housing, a rotary device, and a shank adapter aligned with the percussive device. The shank adapter includes first and second adapter portions. The first ... | 10/31/2006 |
| 7121770 | Tool body and cutting insert for metal cutting operations A cutting tool body that is adapted for use in milling operations comprises at least one pocket for supporting a cutting insert. The pocket is defined, at least in part, by a cylindrical wall and a seating surface within the tool body. At least one passage is provid... | 10/17/2006 |
| 7108577 | Wedge-lock building blocks A building block that is releasably attachable to another block of compatible design by wedging the tongue of one block into the groove of another block, without the need for any intermediate adhesives, bonding materials or any other means of holding the blocks toge... | 09/19/2006 |
| 7055633 | Concrete drill A concrete drill for a rotary and percussively driven hand tool machine with a cutting part (1) and a striking part (2) that is axially and limited displaceable relative to the cutting part (1). Each of the cutting part (1) and the striki... | 06/06/2006 |
| 7051822 | Drill bit and drill tip having a tip-locating structure A drill bit assembly includes a drill bit having a leading end to which a drill tip is bonded. The drill tip has a front cutting edge, a pair of side cutting edges, a rear end and a pair of parallel side walls extending between the respective edges. The leading end ... | 05/30/2006 |
| 7040421 | Liquid driven downhole drilling machine In a liquid downhole drilling machine, the guiding bushing (31) for the drill bit is rotatably journaled in the housing (11, 12) and, via a one-way coupling (29), coupled to a turning sleeve (22) that has axial ridges (24) that bou... | 05/09/2006 |
| 7004686 | Rock bolts with expandable element In a method and device for drilling, in particular impact drilling or rotary percussion drilling, a hole in soil or rock material and forming an anchorage in the hole, wherein a bore hole is formed by the introduction of a drill bit, it is provided that the drill ro... | 02/28/2006 |
| 6971458 | Drill bit A drill bit for drilling a borehole into an earth formation is provided. The drill bit has a central longitudinal axis and a bottom surface facing the borehole bottom during drilling with the drill bit, and comprises primary fluid injection means arranged at the bot... | 12/06/2005 |
| 6926104 | Drill crown A drill crown (1) used for drilling purposes, especially for rotary percussion drilling of a mouth of a blast furnace. The drill crown (1) consists of a drilling head (4) provided with a plurality of hard material or hard metal inserts (6... | 08/09/2005 |
| 6918455 | Drill bit with large inserts A percussion drill bit is provided that has at least two different pluralities of inserts extending from the bit head to better match the conditions seen on the bit head during drilling. The preferred embodiment has a plurality of large inserts with a polycrystallin... | 07/19/2005 |
| 6886645 | Liquid seal for wet roof bit 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 flu... | 05/03/2005 |
| 6712163 | Rock drilling tool A rock drilling tool including a tip (3) formed of a hard material and provided at one end of the tool stem and a shank (4) provided at an opposite end of the stem (2) and having a plurality of entrain grooves (5) extending up to a free e... | 03/30/2004 |
| 6702045 | Drilling apparatus There is provided drilling apparatus (10) comprising a hammer casing (11), a free piston motor piston guide and porting sleeve (12), a drive sub (13), a drill bit (15) splined by shank (16) to the drive sub (13). Below the splined portion (17) the drive s... | 03/09/2004 |
| 6502650 | Percussive down-the-hole hammer for rock drilling, and a drill bit used therein A down-the-hole percussive hammer for rock drilling includes a cylindrical casing and a drill bit disposed at a front end of the casing. The drill bit includes a forwardly facing cutting surface and a center longitudinal passage extending forwardly throug... | 01/07/2003 |
| 6454026 | Percussive down-the-hole hammer for rock drilling, a top sub used therein and a method for adjusting air pressure A down-the-hole percussive hammer includes a cylindrical casing adapted to carry a drill bit, and a piston mounted in the casing for reciprocal movement to repeatedly strike the drill bit. A top sub is mounted at a rear portion of the casing, the top sub ... | 09/24/2002 |
| 6435288 | Rock drill bit A rock drill bit comprising a main body arranged to drill at the end of a shaft of the drilling assembly, the main body having a diameter larger than that of the shaft, a front face on the main body arranged to engage an area for drilling and an outer sur... | 08/20/2002 |
| 6431294 | Percussive tool A percussion drill 10 has a tubular fluid transmitting body 14, with a drill bit 16 mounted on a drill bit support 20 itself mounted in body 14 via a spring 22 and salines 24. A mass 28 is spring mounted in the body 14 and is movable to impact on a face 2... | 08/13/2002 |
| 6405723 | Suction tool A tool for effecting drilling and/or chiseling and including a tubular shaft (2,22) having an axially extending through-channel (8,28) and provided, at one of its axial ends, with a drilling or chiseling head (5), and a connection member (3,23) connected ... | 06/18/2002 |
| 6397956 | Directional drilling tool A rotary-percussion device for directional drilling in rock comprises a substantially cylindrical, rotatable body portion (15) housing a percussion hammer, and a frustroconical head (2) eccentrically mounted on the front of the body portion. The minimum d... | 06/04/2002 |
| 6138775 | Boring machine In a percussion boring machine for producing or widening earth boreholes, the housing is equipped with nozzles and houses a striking piston caused to reciprocate axially by means of compressed air and means of generating pressure which supplies the nozzle... | 10/31/2000 |
| 6125952 | Percussive down-the-hole hammer and a drill bit therefor In an air actuated down-the-hole hammer for rock drilling, a piston reciprocates within a casing to impact against a rear anvil surface of a drill bit. A foot valve extends axially between the piston and the drill bit. The anvil surface is inclined downwa... | 10/03/2000 |
| 6109377 | Rotatable cutting bit assembly with cutting inserts A rotatable cutting bit which comprises an elongate bit body which has a forward end and a rearward end and which defines a peripheral surface. The bit body contains a first seat at the axially forward end thereof. A first cutting insert is mechanically r... | 08/29/2000 |
| 6102141 | Rock drill having an internal flushing channel A rock drill for percussive drilling includes a shank, a collar connected to a front end of the shank, and a rod portion which at one end connects to the collar while the other end carries a rock cutting means. A central flush channel extends from the fro... | 08/15/2000 |
| 6095266 | Drill rod and method for its manufacturer A rock drilling rod is manufactured by placing free ends of first and second hollow rod components in abutment, and establishing relative rotation between the free ends to friction weld those free ends together. The first component comprises a thread and ... | 08/01/2000 |
| 6092612 | Rotary drilling systems A rotary system having a sectional drill steel column connecting a drilling machine and rotary drill bit and being constructed and arranged to accommodate internal fluid flow to the drill bit without pressure loss, and which column employs a coupler secti... | 07/25/2000 |
| 6044920 | Rotatable cutting bit assembly with cutting inserts A rotatable cutting bit which comprises an elongate bit body which has a forward end and a rearward end and which defines a peripheral surface. The bit body contains a first seat at the axially forward end thereof. A first cutting insert is mechanically r... | 04/04/2000 |
