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| Number | Title | Issue Date |
| 5115875 | Hammer drills for making boreholes A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High pressure fluid is suppl... | 05/26/1992 |
| 5113954 | Excavation tool An excavation tool, having a pair of insertion holes placed in the bottom surface of a device, which receives the impact force of a hammer and the rotational force of a hammer cylinder, at positions separated in a radial direction from the center of the d... | 05/19/1992 |
| 5109932 | Impact borer, connector for embedding lines, anchoring cables, and sinking wells An impact borer is disclosed for embedding lines and for sinking geothermal wells. The impact borer has a shell, which has a longitudinal bore. An anvil closes one end of the bore. A ram is reciprocally slideable within the bore, against and away from the... | 05/05/1992 |
| 5107944 | Down hole drills using spent driving fluid for flushing purposes In a water driven down-the-hole rock drill, the rearward end of an associated hammer is provided with a drive piston reciprocable in a cylinder located adjacent the rear of the drill. The front end of the hammer is guided for reciprocation in a bearing lo... | 04/28/1992 |
| 5096000 | Process and apparatus for laying service lines without excavation In a process for laying underground service lines without excavation by means of a ram boring machine, old pipe lines already buried underground are replaced by new service lines without having to tear up the ground or destroy the old pipe line. To enable... | 03/17/1992 |
| 5094303 | Impact apparatus and process for the control of impact apparatus In a device for controlling a pneumatic pile-driving or ram drilling apparatus having an internal, reciprocating ram, the control is effected in a forward stroke phase, a reverse stroke phase, and a subsidiary phase for the supply of air via a control dev... | 03/10/1992 |
| 5088568 | Hydro-mechanical device for underground drilling A hydro-mechanical device for underground drilling for use with a drilling rig comprises a container having a combustion chamber, an ignition system, inlets for introducing a fuel, an oxidizer, a liquid into the combustion chamber, a nozzle for dischargin... | 02/18/1992 |
| 5085284 | Hybrid pneumatic percussion rock drill A fluid actuated percussion rock drill comprising a hollow wear sleeve and a piston slidingly disposed within the wear sleeve. Drive and return pressure surfaces bias the piston between drive and return positions, respectively. A high pressure port is inc... | 02/04/1992 |
| 5056609 | Valve assembly for a downhole to remove bore hole subsidence A downhole hammer having a fluid inlet controlled by a check valve. The valve assembly is used to remove subsidence from a bore hole to prevent problems caused by bore hole collapse. The valve assembly contains a housing and fluid inlet and outlet. A valv... | 10/15/1991 |
| 5031706 | Pneumopercussive soil penetrating machine A self-propelled, pneumopercussive, cyclic action, ground penetrating machine (200) has decreased energy consumption and increased average working velocity compared to conventional machines. This is obtained in part by a valve-operated air-distribution me... | 07/16/1991 |
| 5014796 | Down hole drills using spent driving fluid for flushing purposes In a water driven down-the-hole rock drill, the rearward end of an associated hammer is provided with a drive piston reciprocable in a cylinder located adjacent the rear of the drill. The front end of the hammer is guided for reciprocation in a bearing lo... | 05/14/1991 |
| 4964477 | Pneumatic percussive device A pneumatic percussive device has a casing (1) accomodating a movable hammer piston dividing the interior space of the casing (1) into two chambers. One of these chambers (7) alternately communicates, by means of an air distribution arrangement (3) having... | 10/23/1990 |
| 4958691 | Fluid operated vibratory jar with rotating bit A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing ... | 09/25/1990 |
| 4958690 | Drilling device with hydraulic percussion generator for earth drilling purposes A drilling device for drilling a borehole and comprising a drilling tool, a drill pipe extending into the borehole for conducting a flow of liquid thereinto for generating an oscillating percussion force applied to the drilling tool, a longitudinally mova... | 09/25/1990 |
| 4940097 | Fluid powered rotary percussion drill with formation disintegration inserts A novel fluid powered rotary percussion drill is disclosed having a small, efficient, fluid energy to impulsive mechanical energy conversion motor and a unique bit arrangement wherein individual independently acting formation disintegration inserts are pe... | 07/10/1990 |
| 4938297 | Ram boring machine A pressure-medium driven ram boring machine for boring in the earth, having an impact tip acted on by a percussion piston reciprocating in the machine housing, wherein the impact tip is arranged to be radially adjustable in the housing whereby controlled ... | 07/03/1990 |
| 4932483 | Down hole hammer A down hole hammer comprises a top sub and a drill bit support supporting a drill bit separated by a tubular housing to define a piston chamber therebetween. A feed tube is mounted to the top sub and extends concentrically into the piston chamber. A pisto... | 06/12/1990 |
| 4928775 | Downhole surge valve for earth boring apparatus A manually operated downhole for an underground earth boring apparatus having a pneumatically operated earth boring tool. A drill pipe is connected to the tool and to a source of pneumatic fluid. A valve is positioned in the drill pipe substantially adjac... | 05/29/1990 |
| 4921056 | Hammer drills for making boreholes A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High pressure fluid is suppl... | 05/01/1990 |
| 4913243 | Percussion drill and method of controlling same A percussion drill provided with additional control phases in the form of a gentle braking phase for controlling the rearward movement, and a progressive braking phase for controlling forward movement. To this end, the control slide valve of the drill has... | 04/03/1990 |
| 4890682 | Apparatus for vibrating a pipe string in a borehole A jarring apparatus is provided for vibrating a pipe string in a borehole. The apparatus thereto generates at a downhole location longitudinal vibrations in the pipe string in response to flow of fluid through the interior of said string.... | 01/02/1990 |
| 4886128 | Ram boring implement having a movable bit A ram boring implement having a pneumatically or hydraulically driven percussion piston, movable axially in a reciprocating manner in a housing, and an axially movable bit which is connected to an end of the housing and acted upon directly or indirectly b... | 12/12/1989 |
| 4883133 | Combustion operated drilling apparatus A percussion drilling apparatus for drilling bore holes into subterranean formation in which a plurality of drill rods are arranged in concentric rows in a drill bit housing, each rod having an impact tooth at its lower ends and the rods arranged either t... | 11/28/1989 |
| 4878550 | Pilot-valve-controlled percussion drilling tool A down-hole percussion drilling tool supplied with compressed air includes a piston reciprocated in an enclosed cylinder against a bit. A spool is continuously reciprocated in a valve chamber by a pilot fluid pressure supply, tapped from the compressed ai... | 11/07/1989 |
| 4867255 | Technique for steering a downhole hammer There is disclosed herein an apparatus for providing an underground tunnel utilizing a steerable pneumatically powered, elongated percussive downhole hammer having a forwardmost cutting bit which is asymmetrically configured with respect to the elongation... | 09/19/1989 |
| 4862976 | Spline drive for percussion drilling tool In a percussion drilling tool, a bit is connected to a drill motor through a mating spline connection. External splines on the bit engage internal splines in the drill motor and have respective load bearing faces disposed in a plane extending radially out... | 09/05/1989 |
| 4852669 | Directional downhole drill apparatus An apparatus is provided whereby a standard percussive-type downhole drill may be utilized in directional drilling. This eliminates the need for less efficient tri-cone type downhole motors in this application. A motor is provided directly on top of the h... | 08/01/1989 |
| 4844183 | Accelerator for fishing jar with hydrostatic assist An accelerator for a fishing jar is disclosed. The accelerator includes front, compression, rear, and air chambers. These chambers insure that the pressure of the fluid in the compression chamber is substantially independent of the temperature of the flui... | 07/04/1989 |
| 4840238 | Superposed drilling device In a scavenger is supplied through a scavenging pipe (26) to the internal pipe string (11), the scavenging pipe (25) extending through a bore (27) of the hammer piston (17) of the hammer drill. Due to a rotary drive (14), the drilling strings (10,11) are ... | 06/20/1989 |
| 4840237 | Ram boring implement A ram boring implement has a pneumatically driven percussion piston (16), which is movable in the axial direction in a reciprocating manner in a housing (12), and a control sleeve (24) which is axially adjustable for reversing the direction of motion of t... | 06/20/1989 |
| 4819746 | Reverse circulation down-the-hole hammer drill and bit therefor A reverse circulation down-the-hole hammer drill apparatus for drilling rock and overburden comprises a fluid-driven piston which reciprocates in an annular chamber to repeatedly strike a bit suspended at one end of the chamber, for example in a splined m... | 04/11/1989 |
| 4807709 | Fluid Powered drilling jar A hydraulic drill string jar is powered and actuated by drilling fluid pressure controlled from the earth surface. By selective manipulation of drilling fluid flow, the jar can be conditioned to operate in drilling mode to avoid activation of the jars whi... | 02/28/1989 |
| 4785898 | Device for making holes in soil The invention relates to the construction equipment. A device comprises a body (1) internally accommodating a percussion member (2) with ports (5), an air distributing sleeve (6), an elastic element (7) and a threaded bushing (8). Grooves (9) are made on ... | 11/22/1988 |
| 4771835 | Downhole hammer A down hole hammer comprising a substantially cylindrical casing having a top sub at one end and a drill bit support at the other; a central passageway extending through the top sub, casing and drill bit support; a central tube coaxial with the casing and... | 09/20/1988 |
| 4722403 | Annular air-hammer apparatus for drilling holes The annular air-hammer apparatus for drilling holes comprises a shell hav fitted co-axially therein a chips-receiving sleeve, a hollow cylindrical case, and a ring-shaped hammer capable of reciprocating back and forth. The lower part of the shell accommo... | 02/02/1988 |
| 4709768 | Annular air hammer apparatus for drilling wells An annular air hammer apparatus for drilling wells has a cylindrical body which accommodates a stepped annular hammer mounted for reciprocations. A stepped air distribution tube is rigidly secured in the body and has inlet ports and exhaust ports, the tub... | 12/01/1987 |
| 4705119 | Annular air-hammer apparatus for drilling holes An annular air-hammer apparatus for drilling holes incorporates a hollow cylindrical case with a stepped bore which has inlet and outlet ports. A rock-cutting tool with an axial opening is fitted to the case at the forward end thereof. A chips-receiving s... | 11/10/1987 |
| 4705118 | Hammer for use in a bore hole and apparatus for use therewith Apparatus for drilling a bore hole comprising a hammer and a dual walled drill tube. The hammer comprises a reciprocable piston, fluid flow control device for directing fluid under pressure to the hammer to reciprocally drive the piston, and cutting devic... | 11/10/1987 |
| 4699223 | Method and device for percussion earth drilling In percussion drilling such as earth drilling, a hammer piston driven by pressure medium is axially reciprocally movable in a drill body to transfer impact energy to a drill shank connectable to a drill bit. The axial position of the drill shank in the dr... | 10/13/1987 |
| 4660658 | Hydraulic down-the-hole rock drill Pressurized water is used to operate a percussive down-the-hole drill and the spent motive fluid is used as a flushing fluid. A rear cylinder chamber (24) is constantly pressurized and a valve (28) controls the inlet from the chamber (24) to a bore (23) t... | 04/28/1987 |
