Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 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 |
| 7377338 | Downhole percussion tool 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 whic... | 05/27/2008 |
| 7296641 | Rock drill bit having outer and inner rock-crushing buttons 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 plura... | 11/20/2007 |
| 7281594 | 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 includes an axially forward rock-crushing surface and a skirt that extends axially rea... | 10/16/2007 |
| 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 |
| 7225886 | Drill bit assembly 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... | 06/05/2007 |
| 7207402 | Percussion drill bit and a regrindable cemented carbide button therefor 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 cem... | 04/24/2007 |
| 7168511 | Rotary drill bit having cutting insert with a notch 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 h... | 01/30/2007 |
| 7163070 | Drill head 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. ... | 01/16/2007 |
| 7070010 | Drill bit 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 ax... | 07/04/2006 |
| 7011156 | Percussion tool and method 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 appar... | 03/14/2006 |
| 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 |
| 6915867 | Earth penetrating rotary drill bit with helical ports 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 fu... | 07/12/2005 |
| 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 |
| 6595305 | Drill bit, hard member, and bit body 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... | 07/22/2003 |
| 6543557 | Drill hammer assembly 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 pas... | 04/08/2003 |
| 6467558 | Multiple air hammer apparatus and excavating direction correcting method therefor 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 a... | 10/22/2002 |
| 6315064 | Rotatable cutting bit assembly with cutting inserts 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 ... | 11/13/2001 |
| 6276467 | Percussive rock drill bit with asymmetric wing 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 fac... | 08/21/2001 |
| 6253864 | Percussive shearing drill bit 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... | 07/03/2001 |
| 6105693 | Partially enhanced percussive drill bit 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 (... | 08/22/2000 |
| 6065908 | Drill 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 re... | 05/23/2000 |
| 6035953 | Down hole hammer assembly 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 assemb... | 03/14/2000 |
| 5996714 | Rotatable cutting bit assembly with wedge-lock retention assembly 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 ... | 12/07/1999 |
| 5890551 | Rock drilling tool including a drill bit having a recess in a front surface thereof 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 complet... | 04/06/1999 |
| 5823274 | Drill rod 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 dril... | 10/20/1998 |
| 5794728 | Percussion rock drill bit 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 l... | 08/18/1998 |
| 5590725 | Drilling column with sledgehammer drilling head 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 relat... | 01/07/1997 |
| 5494119 | Core sampling device 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... | 02/27/1996 |
| 5407021 | Down-the-hole hammer drill having reverse circulation 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... | 04/18/1995 |
| 5377770 | Apparatus for improving impact tool lubrication 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 too... | 01/03/1995 |
| 5366032 | Rock bit 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 parall... | 11/22/1994 |
| 5291957 | Method and apparatus for jet cutting 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 th... | 03/08/1994 |
| 5199512 | Method of an apparatus for jet cutting 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 th... | 04/06/1993 |
| 5139099 | Excavation tool 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... | 08/18/1992 |
| 5085285 | Compensating ring for a down hole hammer 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 substant... | 02/04/1992 |
| 5038874 | Drill bit having a flushing medium channel 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... | 08/13/1991 |
| 5025875 | Rock bit for a down-the-hole drill A rock bit for a down-the-hole drill provides auxiliary flow paths for flushing the working face of the drill bit to facilitate the removal of cuttings and debris through peripheral troughs in the drill thereby significantly reducing the abrasive effect o... | 06/25/1991 |
| 4911729 | Overburden eliminator rock drill bit An improved overburden eliminator rock drill bit (10) is provided which includes a cylindrical body (12), cutting inserts (14) mounted thereon, and squared grooves (16) formed along the length of body (12) in a vertically tapered fashion. The taper of gro... | 03/27/1990 |
| 4852672 | Drill apparatus having a primary drill and a pilot drill Drill steel or bit apparatus includes a primary drill bit having a base and a stem, a drill tip, and a bore extending longitudinally through the base, the stem, and the tip, and a pilot drill bit having a base and a stem, and a tip, and the stem and the t... | 08/01/1989 |
