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"What, sir, would you make a ship sail against the wind and currents by lighting a bonfire under her deck? I pray you, excuse me, I have not the time to listen to such nonsense."
Napoleon Bonaparte ; When told of the Robert Fulton steamboat
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| Number | Title | Issue Date |
| 8051926 | Control device The present invention relates to a control device for an impulse-generating device for inducing a shock wave in a tool, in which said impulse-generating device comprises an impact element for transmitting said shock wave to said tool, a counter pressure chamber acti... | 11/08/2011 |
| 8006784 | Backhead and drill assembly with backhead A portion of a drill assembly operated by a supply of compressed fluid comprises a backhead, a cylinder portion, a hollow elongate wear sleeve and a piston. The backhead has a proximal end connectable to the supply, an axial bore and an open distal end having an int... | 08/30/2011 |
| 7950475 | Percussion drilling assembly having a floating feed tube A percussion drilling assembly for boring into the earth is disclosed. The percussion drilling assembly includes a top sub, a casing coupled to the top sub, and a feed tube assembly disposed within the top sub and the casing. The feed tube assembly includes a non-ri... | 05/31/2011 |
| 7866416 | Clutch for a jack element A downhole tool string, comprising a tool string bore and a drill bit located at the bottom of the tool string. The drill bit comprises a body intermediate a shank and a working surface. The working surface may comprise a substantially coaxial rotationally isolated ... | 01/11/2011 |
| 7624822 | Thread joint 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 ... | 12/01/2009 |
| 7428938 | Percussion bit drill drive collar with retention mechanism and method of assembling 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.... | 09/30/2008 |
| 7353890 | Down-the-hole hammer and components for a down-the-hole hammer, and a method of assembling a down-the-hole hammer A down-the-hole hammer includes a casing and a piston movable in the casing between a lowermost operating position and an uppermost operating position. A recess is provided between the piston and the casing so that the piston and the casing define an intermediate ch... | 04/08/2008 |
| 7347287 | Hydraulic timing device A jar for use in a downhole environment comprises an hydraulic timing device which allows pressure to be controllably increased to a desired level and, on firing, a near-instantaneous release of that pressure, and which allows for selective bi-directional firing of ... | 03/25/2008 |
| 7299872 | Hydraulic-mechanical jar tool A jar mechanism comprises a housing having a fluid chamber therein, a piston encircled by an annular metering sleeve and movably mounted in the fluid chamber for movement between a first position and a second position, and a jar member moveably mounted in the housin... | 11/27/2007 |
| 7290624 | Method and device for drilling holes in soil or rock material The invention relates to a method and device for the drilling, in particular the percussive drilling or rotary percussive drilling of holes (9) in the ground or in rock, a bore hole (9) being formed by a drill bit (1) that is mounted on a drill ... | 11/06/2007 |
| 7290966 | Apparatus for dislodging and moving contaminants from a surface of a machine tool An apparatus for dislodging contaminants from a surface of a machine tool. The apparatus includes a coupling, a housing, a cleaning mechanism, and a transport mechanism. The coupling is configured to be mounted on a spindle. The housing is disposed proximate the cou... | 11/06/2007 |
| 7270196 | Drill bit assembly In one aspect of the present invention a drill bit assembly comprises a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element. The body portion has at least a portion of a reactive jackleg apparatus whi... | 09/18/2007 |
| 7267176 | Downhole resettable jar tool with axial passageway and multiple biasing means A wireline jar tool delivers instrument packages into wellbores and retrieves tools when they get stuck. The jar has several stored spring chambers connected to accelerate an upper spring chamber away from a stuck lower carrier chamber that supports instrument packa... | 09/11/2007 |
| 7255182 | Ground drilling tool A back bit (20) is disclosed which is to used in conjunction with drilling equipment (10) which may include a derrick (11), a drilling pipe (12), a back head (14), a starting rod (13), and a cutting bit (15) mounted t... | 08/14/2007 |
| 7234548 | Hydraulic rotary-percussive hammer drill A hydraulic rotary percussive hammer drill includes a body containing a reciprocating percussion piston sliding under the effect of a main hydraulic supply circuit, this main circuit also being intended to cause the sliding of a roughly annular abutment piston house... | 06/26/2007 |
| 7198120 | Down-the-hole drill assembly The invention provides a down-the-hole drill assembly having exhaust passages from upper and lower chambers past the inner end of a bit and through the body of the bit to exit through the bit face. The construction of the assembly and bit obviates a foot valve tube ... | 04/03/2007 |
| 7168491 | Perforation alignment tool for jet drilling, perforating and cleaning Method and apparatus are provided for pumping operations that may be used to form perforations in the casing of a well, clean perforations and drill drain holes through perforations. A plunger is placed in a reference perforation and the pumping operations may be pe... | 01/30/2007 |
| 7124843 | Bit assembly for a hammering drill A bit assembly for a hammering and rotating drill, in which a main drill body (1) is arranged to drill essentially a middle portion of the hole and in the main drill body (1) there is mounted one or more outer bits (2),(3) arranged to dri... | 10/24/2006 |
| 7096972 | Hammer drill attachment Power tools of the type under consideration include hammer drills, for example, which are electric or battery powered and includes two modes of operation: a rotation mode and a rotation-hammer mode. A manually operable selector lever enables the hammer drill to be s... | 08/29/2006 |
| 7017681 | Device for performing hydrodynamic action on wellbore walls The proposed invention relates to wellbore technologies and is intended to produce action on productive rock. Device for hydrodynamic action on wall of a well comprising a casing jointed with the pipe conduit directly or via a roller support and inside of which the ... | 03/28/2006 |
| 6749031 | Drilling system The invention concerns a drilling system having a drilling head (2, 2′) fixed to a drill string (3) which comprises an outer pipe (12, 12′) and a percussion string (13, 13′) inserted therein, wherein the percussion string (13, 13... | 06/15/2004 |
| 6742609 | Rotational impact drill assembly Apparatus is provided for introducing a consistent series of small and localized rotary impacts to a PDC bit during drilling, to improve PDC drill bit performance. Rotary impact supplements the nominal torque supplied by the rotary drive thereby avoiding lockup and ... | 06/01/2004 |
| 6626248 | Assembly and method for jarring a drilling drive pipe into undersea formation A method for driving a drive pipe into a subsea formation, the method being comprised of the following steps: suspending the drive pipe from a drill string; moving at least one mass in a direction having an upward component and within the drive pipe; acce... | 09/30/2003 |
| 6543556 | Abnormal torque absorber for drilling A torque shock absorber apparatus (39) comprised of a mandrel (2) and cylinder (8) with torque absorbing mechanism (8-12, 27) to absorb excessive torque while permitting the transmission of rotational energy to the drill string is connected in the drill s... | 04/08/2003 |
| 6540034 | Portable seismic shothole drilling system A portable apparatus for creating holes in rock. A rock drill connected to a compressed air supply is engaged with a connector attached between the rock drill and a rock bit. The connector has a substantially tubular shaft for transporting compressed air ... | 04/01/2003 |
| 6530440 | Percussive drilling apparatus A percussive drill for extension drilling includes a drill bit, a tube having a male screw thread attached to a female screw thread of the drill bit, and a rod having a male screw thread attached to a female screw thread of the tube. Central passages of t... | 03/11/2003 |
| 6412614 | Downhole shock absorber A shock absorber for damping shock energy generated by downhole perforating guns or stimulation devices is described. The shock absorber includes a spring assembly including at least a first spring and a second spring, the first spring having a tension gr... | 07/02/2002 |
| 6183163 | Method and apparatus for laying out a pipeline A method and apparatus for laying a pipeline. Working and receiving pits are dug out. An active working member is dropped into the working pit at a preselected depth. The active working member is fixed to a vertical knife of a power mechanism. Polyethylen... | 02/06/2001 |
| 6176325 | Moling apparatus and a ground sensing system therefor The invention provides a ground sensing system (10) comprising: sensing means (19) located, in use, on a projectile being driven through ground by means of apparatus having a self adjustment between a vibration mode and a vibro-impact mode according to en... | 01/23/2001 |
| 6164392 | Percussive drilling apparatus A percussive drill for extension drilling includes a drill bit, a tube having a male screw thread attached to a female screw thread of the drill bit, and a rod having a male screw thread attached to a female screw thread of the tube. Central passages of t... | 12/26/2000 |
| 6148934 | Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device A coupling piece for use in drilling has a first connection (2) for connecting to an upper rotary percussion device (3), and a second connection (4) for connecting to a drill tube string (5) provided with an annular drill bit (23). The coupling piece has ... | 11/21/2000 |
| 6109373 | Cable overshot apparatus The overshot apparatus includes a head subassembly coupleable to the overshot coupling device of an inner tube assembly, a jar subassembly having an outer swivel end portion for having a wire line attached thereto and a tubular member and a cable subassem... | 08/29/2000 |
| 5836408 | Rotary percussion blow assisted drill A rotary percussion blow assisted drill has an axially extending shank (1) with at least one main helically extending groove (4) in its axially extending outside surface (2) for conveying drilled material along the shank. A cutting plate (6) with hard met... | 11/17/1998 |
| 5813484 | Casing tube with casing shoe A casing tube formed from plastic and a casing shoe formed from metal are provided for drilling in layers of earth or rock. The casing shoe is locked to the casing tube by threads, grooves or flanges provided on a reduced diameter portion of the casing sh... | 09/29/1998 |
| 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 |
| 5337841 | Hammer type soil excavating machine A hammer device is coupled to an outer portion of a handle, an operating portion is attached to the other portion of the handle, a holding section is attached to one side of the operating portion, and at the same time, a pair of excavators is rotatably at... | 08/16/1994 |
| 5325926 | Reversible casing for a down-the-hole percussive apparatus A reversible casing for a down-the-hole drill has a predetermined snap ring groove length centered between the casing ends, based upon the casing bore, the snap ring groove depth and the snap ring body length, whereby a snap ring will be retained in the s... | 07/05/1994 |
| 5125462 | Quick-change ram boring head In a ram boring machine that has a striking piston reciprocating in a tubular housing and a striking tip that may be formed as a chisel and projects from the housing, connection of the striking tip to the housing by means of a bayonet joint makes installa... | 06/30/1992 |
| 5065827 | Hammer bit retention tool A retention system is disclosed for a hammer-percussion bit assembly which prevents the loss of the lower section of bit after a crack propagates through the shank (rotational drive) section of the bit. The system includes retainer which is mounted onto t... | 11/19/1991 |
| 5018590 | Electromagnetic drilling apparatus Oil drilling apparatus for drilling deep boreholes. The apparatus includes a high frequency, high voltage, AC generator at the surface of the ground which is connected to an electromagnetic hammer drill bit located at the bottom of the borehole. Electric ... | 05/28/1991 |
