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Patent Searching and Data


Matches 251 - 300 out of 1,190

Document Document Title
WO/2000/042288A1
A method and apparatus for forcing an object, such as drainage devices, through the sidewall of a borehole and into the formation to increase oil and gas recovery from the formation. The object usually comprises a plurality of nesting di...  
WO/2000/008303A1
The invention concerns an arrangement for controlling a hydraulic rock drilling device. The adaptation includes a pressure ratio valve (18; 18') that is used for adjusting the relation between the pressures in the pressure channel leadin...  
WO/1999/057409A2
The invention relates to a method for the formation of a plug (1) in a petroleum well (2) extending from the earth's surface or the sea floor to a petroleum reservoir, which well is lined with casing (3, 3'). At least one opening (4) is ...  
WO/1999/054094A1
Hammer device comprising a machine housing (1) with a hammer piston (2) movable to-and-fro. The movement to-and-fro of the hammer piston is controlled by a valve body (6) being movable to-and-fro in the machine housing, said valve body v...  
WO/1999/047313A1
The invention relates to a method for controlling drilling of a rock drill, in which method a pressure sensor (20) measures the pressure in a space situated behind pistons (4a, 4b, 14a, 14b) supporting a shank (2). The pressure value mea...  
WO/1999/032266A1
A high-power, durable impact machine for crushing and boring, which operates with reduced noise and vibration and exhibits high crushing efficiency and high energy efficiency. In the center of an exciting coil (4) to which pulsating volt...  
WO/1998/048141A1
A downhole drilling assembly (10) comprises a body (11) for mounting on a drillstring, the body defining a fluid conduit. A drilling fluid driven motor (12) is mounted in the body (11) and is coupled to a flow restricting device (14) axi...  
WO/1998/042481A1
An arrangement in a rock drill comprising a shank (3) and a percussion piston (2) and lifting means for moving the shank (3) towards the percussion piston (2), and a method of controlling rock drilling. The arrangement comprises a liftin...  
WO/1997/048882A1
The present invention relates to hydraulic percussion mechanisms used in mining and construction industries for treating frozen soils and rocks. This mechanism comprises a body (1) with a gas energy accumulator (2), an introduction chamb...  
WO/1997/014870A1
The present invention relates to a shock-absorbing mechanism for hydraulic hammering devices such as machine drills, which mechanim damps an energy reflected from a shank rod (2) to reduce possible damages and permits a bit, even when a ...  
WO/1997/013622A1
The invention relates to a piston construction for a drilling machine provided with an axial bearing. The piston construction comprises a separate piston portion (5) and a bearing portion (7) to be mounted coaxially with said piston port...  
WO/1997/013621A1
A method for adjusting percussion pressure and a drilling machine. In the method the percussion power of a drilling machine is adjusted by moving a shank (2) in the longitudinal direction of the drilling machine forwards when a smaller p...  
WO/1997/012121A1
The proposed invention pertains to percussion tools, in particular to designs for a drill and drill bit. The proposed pneumatic hammer comprises: a housing; a piston-hammer mounted inside the housing; and a drill bit with a shaft of step...  
WO/1997/012120A1
The proposed invention pertains to mining and quarrying, in particular to tools used for extracting useful minerals, specifically high-pressure subsurface pneumatic hammers. The proposed subsurface pneumatic hammer comprises a housing (1...  
WO/1997/006348A1
Rock and other hard materials, such as concrete, are broken by a combination of a mechanical impact breaker (33, 47) and a small-charge blasting process. A mechanical impact breaker (33, 47) fragments rock by delivering a series of mecha...  
WO/1997/002113A1
A pneumatic impact tool comprises a tubular housing (10) with a rear section (A), an intermediate section (B) and a front section (C), and constant diameter cylinder bore (11) in the intermediate section (B) reciprocably guiding a hammer...  
WO/1996/011775A1
The invention provides a valve arrangement for use in a hydraulic percussive rock drill (10) wherein a piston (18), located in a cylinder (12, 14), is caused to reciprocate by hydraulic fluid flow, the valve arrangement including a valve...  
WO/1995/031629A1
A reverse percussion device (30) for use with hydraulic percussive drills is provided. The reverse percussion device (30) includes a cycling piston (34), valve (36) and anvil (38). The piston (34) and valve (36) move in opposing directio...  
WO/1995/016847A1
A hydraulic impact motor in the form of a water-driven in-hole rock drilling machine has a valve spool (40) that has two equally big and opposite directed control surfaces (A1 and A2). The valve has also a third control surface (A3) whic...  
WO/1995/016848A1
An in-hole rock drilling machine has a tubular housing (12) with a piston hammer (24) that is guided at its ends only. Its front portion is guided by a guide bushing (18) that takes support against a shoulder (13) in the housing and its ...  
WO/1995/014878A1
Boring apparatus for forming a generally horizontal underground passage (10) in soil for a utility conduit or the like that includes a tool head (24) with a base portion (26) and a nose portion (28) mounted on the base portion. The base ...  
WO/1995/002110A2
In an impact drilling apparatus, an impact hammer is provided that includes a body portion and a piston head on the body portion. The piston head has a larger outer periphery than the body portion. The body portion and the piston head ha...  
WO/1994/024403A1
A rock drill (10) which includes a main body (16) with a chamber (38; 38A) which is formed in the main body at a first end of the main body, and a rotation module (14) which includes a gear housing (28), at least the gear housing (28) be...  
WO/1994/023906A1
A rock drill with a percussion mechanism which includes a piston (32), a body (12) in which is formed a chamber (14), at least a first cylinder (18) which is located in the chamber and which, on an inner side, forms at least part of a sl...  
WO/1994/024415A1
A control system for a percussion drill with a hydraulically actuated drill rotation mechanism (12), a drill feed mechanism (14) which includes a control means (48) which operates, in response to the hydraulic pressure in the drill feed ...  
WO/1993/023653A1
The present invention relates to a device for loosening drilling rods (4), either single rods or connected splicing rods, and for the object of providing a simple and effective dewedging device, the device according to the invention comp...  
WO/1993/008364A1
A pneumatic hammer is provided with an adjusting means (37) dependent on the supply pressure, which adjusts the stroke length of the working piston (16). Thereby, the same pneumatic hammer may be operated both at low and high supply pres...  
WO/1993/008363A1
A pneumatic hammer is provided with an adjusting means (37) dependent on the supply pressure, which adjusts the stroke length of the working piston (16). Thereby, the same pneumatic hammer may be operated both at low and high supply pres...  
WO/1992/022727A1
When driving a tube (24) into the ground, primarily for subsequently loading the tube with an explosive substance and subsequent blasting of the surrounding ground, there is used a driving rod (20) whose rear end is provided with an inse...  
WO/1992/014904A1
A drill head (1) for use to drill a hole (3) in a front of hard material (5) such as rock, which comprises a main body (11) acting at a central support, an upwardly projecting spindle (15) secured on top of the main body, the spindle hav...  
WO/1992/014026A1
The invention concerns a device for the intermittent driving of a drill rod or measurement probe by means of a drop hammer (11) or rammer. The device comprises a striker system which includes the drop hammer (11) or rammer and two roller...  
WO/1992/012323A1
A hydraulic down-the-hole drilling machine including a piston (8) that seen from the inlet (24) of the machine has a first (9), a second (10) and a third (11) piston portion with consecutively increasing diameter. To the third piston por...  
WO/1991/006744A1
Impact rippers are useful, for example, in fracturing rock and other hard material which is to be excavated. Known systems using structures which mount the impact hammer and the linear ram within a single housing transmit vibrations into...  
WO/1991/002880A1
The subject of the main application P 38 42 081.3 is a drill, especially for shot holes, with a hydraulically actuated intra-hole hammer arranged on the front end of the drill spindle. The drive (2) for the drill spindle exerts a to-and-...  
WO/1991/000952A1
In a striking device the striking mechanism (1) is provided with a means (32) intended for its elastic resilient connection with the working machine and rigidly secured on a casing (3) of the striking mechanism (1) in a plane which is pe...  
WO/1990/007626A1
An instrument for percussion-rotary drilling comprises a rotatable casing (1) provided with a shank (2) intended for interaction with a percussion device (3). The butt-end surface (4) of the casing (1) facing the rock is provided with ro...  
WO/1990/001612A1
A compression-vacuum percussion machine comprises, located in a casing (1), a cylinder (2) in which are mounted a striker (7) and a piston (3) separated from the striker by an air cushion (8), a crank (5) connected to the piston (3) and ...  
WO/1989/011022A1
A hydraulic drilling machine comprises a drilling instrument (1) connected to a hydraulic motor (3), a hydraulic striker (4) connected through a hydraulic distributor (15), to a pressure line (11) and a drain line (21), and a device (16)...  
WO/1989/010688A1
A method of determining the quantity of milk extracted by a milking installation from one cow consists of producing a continuous flow of milk (28) from one cow and making, from that flow, separate doses of milk (28). The production of se...  
WO/1989/010687A1
The device comprises a reservoir for extracted milk connected to a milking apparatus (3). Inside the reservoir (1) is located a milk level pick-up consisting of a float (15) with a magnet (16), through which passes a cylindrical casing (...  
WO/1989/008769A1
A drill, in particular for blast holes, comprises a mounting for the advance and withdrawal of the drill string composed of individual drill rods, an advance system, an hydraulic drive for the drill string, an injection head on the mount...  
WO/1989/007192A1
A device for making wells in the ground comprises a striking mechanism (1), a cylindrical casing (15) provided in its upper part with a flange (16) and with an inclined surface (17) located below the flange (16). A cap (18) with a throug...  
WO/1989/006586A1
A percussion tool usable as part of a single tool impact device or a multi-tool impact device. In each case, the tool is rotatably driven by a high-torque rotary actuator (40) with the tool being longitudinally splined and received withi...  
WO/1988/005115A1
A percussion device intended for deformation of the material being treated comprises a casing (1) with a movable striker (2) mounted inside it. The shank (3) of the striker (2) is mounted inside a power cylinder (6) so that it receives t...  
WO/1987/003925A1
A percussion device comprising a casing (1) with a movable striker (2) connected with an actuating cylinder (6) in which is mounted a shank (4) of the striker (2) provided with a clamping mechanism (14) and with an actuator consisting of...  
WO/1986/003534A1
A clamping arrangement to a device for driving into the ground lengthy rod elements of a low rigidity comprises a casing (1) with a through conical hollow (2) and with protrusions (7) on its external surface. Two wedging spring-loaded el...  
WO/1986/002694A1
An hydraulic rock drill which can be used either as a rotary percussive rock drill or as a rotary rock drill. It has a pressure fluid chamber (90) that transmits the feeding force that is applied to the rock drill housing during drilling...  
WO/1983/001977A1
A tool assembly (4) for working a material (R) such as breaking rock. Assembly (4) includes a tool mounting (17) having a fixed section (18), and a movable section (19) for movement relative to the fixed section (18) in a working directi...  
WO/1981/003518A1
A vibration isolator device (10) is connected between a support member (72) and a percussion tool (14) having a distal work element (52) movable at a preselected vibratory rate. The vibration isolator device (10) includes a passive syste...  
WO/1981/001590A1
A pneumatic percussion machine comprises a casing (1) provided with a grip (2), a barrel (3) with a feeder (10) fixed to it and with a striker placed inside it, the barrel being movably mounted inside the casing in guides (4), and a pack...  

Matches 251 - 300 out of 1,190