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| Number | Title | Issue Date |
| 7441608 | Percussion device with a transmission element compressing an elastic energy storing material A percussion device for a rock drilling machine or the like, which includes providing an impact, i.e. a stress pulse, to a tool connected to the percussion device. The the stress pulse is provided by way of a stress element of liquid, which is supported to a body of... | 10/28/2008 |
| 7322425 | Method of generating stress pulse in tool by means of pressure fluid operated impact device, and impact device A method of generating a stress pulse, and an impact device. In the method, pressure fluid is fed as pressure pulses to a working chamber residing between the frame of the impact device and a tool such that the resulting force presses the tool towards the material t... | 01/29/2008 |
| 7290622 | Impact device with a rotable control valve An impact device includes a frame to which a tool is connectible, and a stress element that is supported on the frame and disposed between the frame and the tool. A hydraulic control system leads pressurized hydraulic fluid into and out of a hydraulic fluid space su... | 11/06/2007 |
| 7252154 | Percussion device with a transmission element compressing an elastic energy storing material A percussion device for a rock drilling machine or the like, which comprises means for providing an impact, i.e. a stress pulse, to a tool connected to the percussion device. The means for proving the stress pulse include a stress element (4) of liquid, which... | 08/07/2007 |
| 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 |
| 7172200 | Sealing arrangement on piston rods A sealing arrangement on piston rods with a rod guided in a cylindrical compressed-gas space, particularly on piston rods of high-pressure pneumatic springs or gas-filled shock absorbers, with at least one seal disposed on the piston rod for sealing the compressed-g... | 02/06/2007 |
| 7013996 | Impact device An impact device for a rock drill. The rock drill includes a tool and a mechanism for delivering a stress pulse to the tool. That mechanism includes an impact element supported to a frame of the drill, and a mechanism for subjecting the impact element to stress and ... | 03/21/2006 |
| 6904980 | Linerbolt removal tool A pneumatic linerbolt removing tool including a moil supported for reciprocal movement along a hammer axis within a housing, an inertial body movably mounted along the hammer axis, and a piston assembly moveable within the inertial body along the hammer axis between... | 06/14/2005 |
| 6321854 | Power tool A percussion power tool assembly (10) comprises a hand-held percussion power tool (11), a chamber (12) mounted on the tool (11), and a fluid reservoir (14) supported independently of the tool (11). The percussion power tool (11) has a body (20) housing a ... | 11/27/2001 |
| 6164393 | Impact tool A hydraulic impact tool for use in a well, such as an oil or gas well, comprising a movable hammer which is arranged to prestress a spring by means of a hydraulic piston (16) provided with a through channel (20), and in which a movable sealing body (22, 4... | 12/26/2000 |
| 6155353 | Impact tool A percussive hammer for delivering impacts driven by oil which is quickly applied under pressure derived from a system supply and from a source of compressed gas.... | 12/05/2000 |
| 6152245 | Compressed-air-operated percussion mechanism A compressed-air-operated percussion mechanism includes a housing, a percussion body and a balancing body, which form an operating chamber therebetween. A secondary valve seals the operating chamber during an operating stroke and opens the chamber to evac... | 11/28/2000 |
| 6105686 | Pressure accumulator arrangement in connection with a hydraulically operated impact device, such as a breaking apparatus The invention relates to an arrangement in connection with a hydraulically operated impact device, such as a breaking apparatus. The impact device includes a percussion piston, conduits for feeding pressure fluid into and out of the impact device, and a p... | 08/22/2000 |
| 6000448 | Delimber system An improvement to a delimber system having a delimbing unit including cutting elements, for cutting limbs extending from a tree trunk, and a tree trunk loader mechanism, for pulling the tree trunk of a tree to be delimbed through the delimbing unit such t... | 12/14/1999 |
| 5971083 | Pressure fluid operated impact mechanism Pressure fluid operated impact mechanism having a reciprocating working member (5), a stop member (17) and, formed between said members, a drive chamber (18) with seals (15, 16) and a regulating valve (21) co-operating with a supply opening (25) for press... | 10/26/1999 |
| 5893419 | Hydraulic impact tool A hydraulically driven hammer has a piston which contains metal piston rings on a constant diameter section. The housing has a plurality of axially spaced apart radial ports that extend through the housing into the bore. A valve supplies fluid to the port... | 04/13/1999 |
| 5755292 | Pressure medium operated impact mechanism A pressure medium operated reciprocating impact mechanism has at least one working member (7) and at least one stop member (15), which are axially movable with respect to each other, and a working chamber (22) for pressure medium is arranged in at least o... | 05/26/1998 |
| 5752571 | Apparatus for generating impacts An apparatus for generating impacts which has a hydraulic cylinder and a reciprocating piston. The hydraulic cylinder has an impact chamber, a cavity which receives and diverts fluid, and a throat which connects the impact chamber with the cavity. When th... | 05/19/1998 |
| 5392865 | Hydraulic percussion apparatus Apparatus comprising a striking piston driven hydraulically in a reciprocating fashion by an incompressible fluid inside a cylinder and striking against a tool, of the type in which the piston slides in a cylinder having two concentric piston bearing surf... | 02/28/1995 |
| 5366025 | Drill and/or percussion hammer A drill or impact hammer has a mechanical striking mechanism which is driven in a reciprocating manner by a drive element which is tiltable around an axle. A resilient driver member which is tiltable around the axle serves to transmit this movement to a s... | 11/22/1994 |
| 5205363 | Porting system for pneumatic impact hammer A pneumatic downhole impact drill having a porting system for automatically supplying pneumatic pressure fluid from a fluid delivery tube received within a coaxial bore in the impact piston to the opposite ends of the piston operating cylinder as the pist... | 04/27/1993 |
| 4951757 | Hydraulic striking device with impact frequency control In the hydraulic breaker according to the present invention, oil pressure at a fixed value always flows in the circuit at a low pressure side whenever the piston is raised or lowered, to prevent the need for an accumulator in the circuit at the low pressu... | 08/28/1990 |
| 4790390 | Valveless down-the-hole drill A valveless down-the-hole hammer drill is actuated by fluid such as compressed air. The drill includes a piston disposed within a chamber defined within an outer wear sleeve, an air diverter at one end and a suspendably mounted drill bit at the other end,... | 12/13/1988 |
| 4688468 | Method of and apparatus for controlling pulse hydraulic generators A piston for a striker is displaceable in a cylinder and forms compartments on opposite sides which can selectively be connected by hydraulically controlled valve elements to a pump and to an accumulator. A hydraulic controller for the valve elements init... | 08/25/1987 |
| 4609053 | Hammer tool A hammer tool with a drive motor (16) and a hammer mechanism (35), the hammer mechanism including a drive piston (38) reciprocably movable in a cylinder (34) for driving a hammer piston (39) towards a working tool (13) releasably coupled to the front end ... | 09/02/1986 |
| 4605073 | Device in needle hammers A device in pressure medium operated needle hammers, the needles (24) being arranged in a reciprocatingly movable working member (3) by at least one flexible holder member (31, 39) and, by a friction grip of the holder member being caused to follow the mo... | 08/12/1986 |
| 4552227 | Reciprocating linear fluid motor Hydraulic fluid pressure moves a piston (22) against a body of incompressible fluid (14), compressing a spring (42). The pressure is released, and the force of the stored energy in the spring (42) is transmitted to the piston (22) by the body of fluid (14... | 11/12/1985 |
| 4505340 | Hydropneumatic percussive tool A vibration or reciprocating hydraulically driven impact tool for breaking up paving, compacting soil, or similar construction purposes. The tool employs a piston situated in a housing and configured to form (in cooperation with the housing) three chamber... | 03/19/1985 |
| 4479551 | Actuator for a hydraulic impact device A linear actuator includes a ram and a piston separated by a column of hydraulic fluid in a housing. Upward movement of the ram in the housing first seals a finite quantity of hydraulic fluid in the housing cavity. Continued upward ram movement then cause... | 10/30/1984 |
| 4466493 | Reciprocating linear fluid motor Hydraulic fluid pressure moves a piston (22) against a body of incompressible fluid (14), compressing a spring (42). The pressure is released, and the force of the stored energy in the spring (42) is transmitted to the piston (22) by the body of fluid (14... | 08/21/1984 |
| 4314612 | Hydraulic linear impact tool A hydraulically operated impact tool is provided for performing land-based or undersea tasks including hammering, chipping, scraping, punching, and cutting. The tool's features include a spring (preferably hydroelastic) for storing impact-stroke energy, a... | 02/09/1982 |
| 4290489 | Vibrationless pneumatic tools A pneumatic system includes a pneumatic motor, which may take the form of a vibrationless paving breaker utilizing a blow-striking member or hammer that is propelled to and from its force-transmitting or blow-striking position by a compressed gas. A valvi... | 09/22/1981 |
| 4264107 | Demolition tool for breaking solid materials A demolition tool for breaking solid materials, particularly rock or concrete in tunnelling, mining, demolishing and excavating applications. The tool has a single impactor (1) of the projectile type which is driven by high pressure liquid towards the mat... | 04/28/1981 |
| 4231434 | Hydraulic impact device A hydraulic impact device in which a hammer member having a piston portion is reciprocally disposed in a cylinder, a reciprocating sleeve valve is disposed within the cylinder and surrounds the hammer member. The sleeve valve has a first peripheral seal w... | 11/04/1980 |
| 4215808 | Portable electric fastener driving apparatus A portable electric fastener driving apparatus includes a unique fastener driving element operatively connected to the piston of an air spring which is charged to provide energy for driving fasteners. The air spring is charged by a unique jacking and rele... | 08/05/1980 |
| 4207812 | Apparatus for die stamping battery container can ends An apparatus for die stamping the end of battery cell containers which includes a die holder, a hollow tube for engaging and guiding the container end with the die, a hammer for impacting the end of the guided and engaged container end with the die and an... | 06/17/1980 |
| 4181183 | Impact tool An improved impact tool which has a cylinder, a liner mounted therein, a piston mounted in the liner and reciprocated by gas and hydraulic pressure, and a tubular valve slidably mounted on the liner for controlling a hydraulic circuit. The tubular valve i... | 01/01/1980 |
| 4100975 | Power booster A power booster assembly for use to increase the power used in pulling or driving tool mechanism such as used in straightening an automobile frame and the like. A cylindrical body having closed ends and attachment means at each of the ends with a power pi... | 07/18/1978 |
| 3995703 | Electrohydraulically operated portable power tool A portable power tool wherein the housing contains a pump, a tank for a supply of oil for the pump, an electric motor for the pump and one or more hydraulic motors which receive pressurized oil from the pump and impart movements to a rotary and/or recipro... | 12/07/1976 |
