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| Number | Title | Issue Date |
| 7762350 | Impulse generator and impulse tool with impulse generator The invention relates to an impulse generator (2) for a rock breaking tool, which comprises a propulsion chamber (6) for receiving a pressurizeable liquid volume (8), and an in the propulsion chamber (6) received impulse piston (10... | 07/27/2010 |
| 7410010 | Hydraulic impact mechanism A hydraulic impact mechanism includes a housing with a cylinder bore, a forward working chamber and a rear working chamber, a hydraulic fluid supply passage connected to the forward working chamber and a drain passage connected to the rear working chamber, a hammer ... | 08/12/2008 |
| 7404452 | Percussion power tool apparatus A percussion power tool apparatus includes a body relative to which an impacting tool is moved to effect an impacting operation, the apparatus further including an operating member by means of which an operating load is applied in an operating direction to the appar... | 07/29/2008 |
| 7252158 | Pilot valve for a pneumatic tool A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exha... | 08/07/2007 |
| 7198116 | Wholly air-controlled impact mechanism for high-speed energy-accumulating pneumatic wrench A wholly air-controlled impact mechanism invented for creating a more compact and powerful pneumatic wrench comprises a flying hammer, a pressure impulse generator and a pressure container containing the hammer and the generator. The main part of the flying hammer i... | 04/03/2007 |
| 7156190 | Impact tool An impact tool has a slidable hammer that is driven by hydraulic oil under pressure inside a chamber. The hydraulic oil is pressurized by a piston driven by compressed gas on the opposite side of the piston from the hydraulic oil. The gas in the gas chamber is compr... | 01/02/2007 |
| 6905056 | Setting tool A setting tool for driving fastening elements in a constructional component includes a drive piston displaceable in the guide space (11) of the piston guide (12) by propellant gases generated by a propellant charge from an initial position (40) ... | 06/14/2005 |
| 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 |
| 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 |
| 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 |
| 6102133 | RAM For selective operation in a Diesel mode and a pressure air mode a Diesel type pile hammer is additionally equipped with a pressure air accumulator, which is connected to the working space of the cylinder by a servo valve.... | 08/15/2000 |
| 6073706 | Hydraulically operated impact device The invention relates to a hydraulically operated impact device, such as a percussion hammer or some other breaking apparatus, comprising a control valve (6) for controlling pressure fluid supplied to and from the percussion piston (1) so that the directi... | 06/13/2000 |
| 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 |
| 5890548 | Hydraulic percussion hammer Hydraulic percussion hammer, in which a motion of a percussion piston (1) is controlled by a main valve (3), the control motion of which is controlled by a separate control valve (9) in such a way that the main valve changes its state, when the pressure a... | 04/06/1999 |
| 5875857 | Accumulator charging system A hydraulically operated rock drill including a cylinder, a piston mounted for reciprocating movement in the cylinder, a hydraulic fluid line connected to the cylinder, and an accumulator. A chamber with a section of reduced dimensions is formed in the cy... | 03/02/1999 |
| 5836400 | Three speed circuit for hydraulic tool A hydraulic tool having a ram or other working element propelled by pressurized fluid. The tool has a lever which is squeezed to develop fluid force in a pump. The fluid circuitry automatically operates the ram selectively at any one of three operating sp... | 11/17/1998 |
| 5718297 | Hydraulic impact hammer The impact hammer comprises a working piston (22) exerting impacts onto an impact surface (23). The hydraulically driven working piston (22) is reciprocatingly controlled by a control means (40,41). At the rearward end of the working cylinder (21), there ... | 02/17/1998 |
| 5653295 | Hydraulic precussion hammer The invention relates to a hydraulic percussion hammer comprising a piston (1), a pressure accumulator (7) in the high pressure circuit, a main valve (8) alternately conducing a high and low pressure to at least one of the pressure surfaces (2,4) of the p... | 08/05/1997 |
| 5562170 | Self-lubricating, fluid-actuated, percussive down-the-hole drill A fluid-actuated, percussive, down-the-hole drill having a piston slidingly supported in a casing and passageways for transmitting flow of percussive fluid to actuate the piston is provided with self-lubricating bearings and self-lubricating seals within ... | 10/08/1996 |
| 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 |
| 5279120 | Hydraulic striking device A hydraulic striking device requiring no complicated adjustment of the flow rate of hydraulic fluid from the hydraulic pressure source of a hydraulic construction machine, etc. and operable by utilizing the power unit of a variety of such hydraulic machin... | 01/18/1994 |
| 5082067 | Apparatus with two end positions generating a reciprocating motion An apparatus with two limit positions and generating a reciprocating motion, comprises a first moving part (4a, 4b) and a second moving part (16a, 16b) between which parts (4a, 4b; 16a, 16b) a pressurized drive medium (38a, 38b) such as compressed air, is... | 01/21/1992 |
| 5064005 | Impact hammer and control arrangement therefor Hydraulic hammers are normally controlled by an actuating valve which controls the flow of fluid from a source of pressurized fluid to the hydraulic hammer. During certain periods of operation, the actuating valve totally blocks communication of fluid to ... | 11/12/1991 |
| 5056606 | Damped hammer drill A fluid-powered hammer drill has a bore in which a tool shaft is normally coaxially engaged. A piston displaceable in the bore defines a front return chamber of small effective piston surface area and a rear drive chamber of larger effective surface area.... | 10/15/1991 |
| 5010963 | Hydraulic drilling machine A hydraulic drilling machine comprises a drill tool (1) connected to a hydraulic motor (3), a hydraulic percussive mechanism (4) connected via a hydraulic distributor (15) to a hydraulic pressure line (11) and to a hydraulic discharge line (21), and a mea... | 04/30/1991 |
| 4858702 | Hydraulic distributor for percussion apparatus driven by an incompressible fluid under pressure In the body of the distributor (6) is mounted for sliding a valve (21) delimiting with the bore of the distributor in which it is mounted at least one control chamber (22) in permanent communication by means of at least one channel (31) with the control c... | 08/22/1989 |
| 4852663 | Hydraulic percussive machines The present invention is directed to a hydraulic percussive machine with a shuttle valve to control the flow of fluid to and from a drive chamber without timing lands on the piston and a seal between the drive and return chambers. This is made possible by... | 08/01/1989 |
| 4828048 | Hydraulic Percussion tool A hydraulic in-the-hole type percussion tool including an elongated piston-hammer which is disposed for delivering percussion blows to an impact receiving bit or shank member and is adapted to reset an elongated tubular sleeve type distributing valve disp... | 05/09/1989 |
| 4784228 | Impact device An impact device that consists of a housing having a bore, a piston, and a change-over valve for control of the reciprocal movement of the piston is presented in the present invention. In the present invention, it is not necessary to employ a long-size pi... | 11/15/1988 |
| 4676323 | Hydraulically operated percussive machine and an accumulator therefor A hydraulic percussive machine, for example a jack hammer or a rock drill, has an accumulator with a flexible diaphram (35). A lift valve (40, 41, 42) closes the outlet of the accumulator if the flow exceeds the normal flow substantially and it traps a vo... | 06/30/1987 |
| 4667748 | Method of driving an element and an hydraulic impactor In an impactor, e.g. a jack hammer, a liquid column is accelerated through an empty barrel 26 and it impacts on a piston surface (34) of the tool (24), e.g. a chisel.... | 05/26/1987 |
| 4658913 | 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... | 04/21/1987 |
| 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 |
| 4474248 | Hydraulic demolishing rock drill Hydraulic breaking down or demolishing rock drill in which there is a stroke only pressing the drill against the surface to be broken down or drilled. The result is a reduced hard work of the operator and a reduced wear of the drill parts. This drill has ... | 10/02/1984 |
| 4460051 | Percussion drill hammer In a cylinder formed in a casing a hammer piston is mounted for reciprocating motion and is subjected to periodic pressure pulses from a pressure fluid. To prevent a reaction emanating from each pressure pulse from also acting as a shock on the casing, a ... | 07/17/1984 |
| 4349075 | Hydraulically operated impact motor A hydraulically operated impact motor, e.g. for a jack hammer, has a hammer piston that has a piston surface 19 in a pressure chamber 21 which is constantly pressurized in order to effect the work strokes of the hammer piston, and a larger piston surface ... | 09/14/1982 |
| 4282937 | Hammer A hydraulically operable hammer and more particularly a hydraulically operable hammer having improved cycling of a hammer piston reciprocable therewithin.... | 08/11/1981 |
| 4192389 | Single impact rivet gun A single impact rivet gun has a piston freely movable within a cylinder that is surrounded by an air accumulator. A valve to control flow of the air from the accumulator to the inside of the cylinder is located at one end of the cylinder and the valve has... | 03/11/1980 |
| 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 |
