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| Number | Title | Issue Date |
| 8141655 | Hammer having a two part body A tool assembly such as a hammer assembly, includes a housing defining a chamber and a reciprocating piston arranged in the chamber for cyclical movement in a work stroke and a return stroke. The housing includes a lower housing member, an upper housing member and a... | 03/27/2012 |
| 7896102 | Pneumatic drive system A pneumatic drive system (1) in which the movement of an output drive unit (7) of a pneumatic drive (2) is controlled by a control valve (25 and 26) which is connected with the working chambers (12 and 13) of the pneu... | 03/01/2011 |
| 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 |
| 7392855 | Vibratory pile driving systems and methods A drive system for driving and/or extracting an elongate member. The drive system comprises a piston drive assembly, a hydraulic system, and a vibration drive assembly. The piston drive assembly comprises a piston member, and the piston member engages the elongate m... | 07/01/2008 |
| 7350428 | Apparatus and process for collection of gas and vapor samples A gas sampling apparatus and process is provided in which a standard crimping tool is modified by an attached collar. The collar permits operation of the crimping tool while also facilitating the introduction of a supply of gas to be introduced into a storage vial. ... | 04/01/2008 |
| 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 |
| 7308949 | Concrete drill A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) cont... | 12/18/2007 |
| 7306047 | Impact hammer drill An impact hammer drill capable of performing drilling operation at a high speed with low noise and without requiring a large thrust. The drill includes a main shaft rotatable by an output shaft of a motor, and a spindle having an impact-receiving section and dispose... | 12/11/2007 |
| 7252155 | Percussive power tool with flushing head A power tool (1) having a striking means (5), by which a percussive tool (2) that can be driven at least partially along an axis (A) struck directly and having a flushing bore (4) extending at least partially longitudinally through a tool... | 08/07/2007 |
| 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 |
| 7234537 | Sonic drill A sonic drilling apparatus having a work piston within a cylinder chamber to provide a vibratory force through the alternate application of fluid under pressure into the bore above and below the piston in a manner that the piston will be forced to reciprocate within... | 06/26/2007 |
| 7207633 | Scaling assembly A scaling apparatus comprises a hammer component and a pick component which includes a tooth. The apparatus also includes a mechanism for moving the pick component with respect to the hammer component to thereby impart a scaling force to and through the tooth. In a ... | 04/24/2007 |
| 7201302 | Driver blade with auxiliary combustion chamber for combustion powered fastener-driving tool A driver blade for use in a combustion-powered fastener-driving tool includes an elongate tubular body having a combustion end and a driving end, the combustion end being configured for attachment to a piston, and the driving end having a substantially solid cross-s... | 04/10/2007 |
| 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 |
| 7131503 | Impact driver having a percussion application mechanism which operation mode can be selectively switched between percussion and non-percussion modes An impact driver capable of boring and having an excellent usability is provided. An anvil(8) is arranged so as to slightly move in the axial direction. A first cam(29) having cam gears(30, 30 . . . ) is externally provided at the anvil so as to... | 11/07/2006 |
| 7073607 | Operating system for hydraulic rock drill A hydraulic rock drill comprises a housing having a piston and valve bore formed therein, a rotation motor, and a fluid connection and fluid reservoir interposed between the housing and the rotation motor. Fluid connections to the hydraulic rock drill comprise a sin... | 07/11/2006 |
| 7055621 | Method and apparatus for replacement of underground pipe An impactor for use with a directional boring machine for replacement of underground pipes includes a bursting head having a rearwardly opening recess and a front end opening that communicates with the recess. An inlet pipe is connected at its front end to a distal ... | 06/06/2006 |
| 7051568 | Multi-purpose hydraulic tool A multi-purpose hydraulic tool of the open center and closed center type is provided with an OC/CC knob mounted on the trigger activated spool. The spool has a knob which can be turned to easily move between OC and CC operating conditions, without the use of additio... | 05/30/2006 |
| 7051995 | Device for generating a reciprocating movement, valve arrangement therefore and pheumatic tool A pressure-fluid driven device for generating a reciprocating movement includes a first (5) and a second relatively movable part (3), wherein a working chamber (7) is intended to be alternatively pressurised and depressurised so as to drive the ... | 05/30/2006 |
| 7032688 | Shock absorbing 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... | 04/25/2006 |
| 7032684 | Method of opening joints between drilling components, and rock drill A rock drill includes a string of components interconnected by screw threads and connected to a shank. A percussion piston is reciprocated against the shank during a drilling operation, while a support device applies axial support to the rear of the shank, to enhanc... | 04/25/2006 |
| 6988564 | Diesel hammer systems and methods A diesel hammer system for driving a pile, comprising a housing, an anvil member supported by the housing, a clamp assembly adapted to connect the anvil member to the pile, and a ram member disposed within the housing. A fuel pump system injects fuel into a combusti... | 01/24/2006 |
| 6981558 | Controller for an unbalanced mass adjusting unit of a soil compacting device The invention relates to a controller for an unbalanced mass adjusting unit in a vibration exciter. Said controller comprises an adjusting piston for changing the relative position of unbalanced masses in the vibration exciter that is coupled to a reference piston. ... | 01/03/2006 |
| 6978919 | Holder for a drive piston of a setting tool A piston holder for a drive piston (8) of a setting tool and having a circumferential adjusting surface (16) inclined toward a central axis (17) thereof so that a diameter of the adjusting surface (16) increase toward a rear, with respect... | 12/27/2005 |
| 6966240 | Hydraulic ratchet wrench with double-action hydraulic cylinder piston drive The invention relates to a hydraulic ratchet wrench with a double-action hydraulic cylinder piston drive with a gear pump (20) and a piston pump (21). According to the invention, a working stroke and a return stroke are controlled through a reversal of... | 11/22/2005 |
| 6959967 | Hammer with high pressure shut-off A fluid-powered impact vibrator (5), in particular a hydraulic hammer, comprising a fluid-powered percussion hammer (8) with a percussion piston (18) that is moved back and forth under the effect of a control means (10) and comprising a g... | 11/01/2005 |
| 6938702 | Method and equipment for controlling operation of rock drilling apparatus A method and an equipment for controlling the operation of a rock drilling apparatus, which rock drilling apparatus comprises a percussion device for producing impact energy to a tool of the rock drilling apparatus, a rotating device for rotating the tool in a drill... | 09/06/2005 |
| 6932166 | 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... | 08/23/2005 |
| 6913091 | Method and apparatus for replacement of underground pipe An impactor for use with a directional boring machine for replacement of underground pipes includes a bursting head having a rearwardly opening recess and a front end opening that communicates with the recess. An inlet pipe is connected at its front end to a distal ... | 07/05/2005 |
| 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 |
| 6877569 | Method for controlling operating cycle of impact device, and impact device A method for controlling the operating cycle of an impact device, and an impact device. Percussion piston position is measured using a sensor (11) from which the measurement data is transmitted to a control unit (12) of the impact device, which in turn... | 04/12/2005 |
| 6860340 | Rock drilling machine A rock drilling machine has a housing (1), a hammer piston (2) movable to-and-fro in the housing, a drilling tool (3), and a guide (4) for the drilling tool. The guide (4) consists at the surface against the drilling tool (3... | 03/01/2005 |
| 6857482 | Percussive implement of the rock breaker type The invention concerns an apparatus comprising a body (2) wherein a piston (6) is mounted sliding alternately driven by an incompressible fluid under pressure, said body containing part of a tool (4) which is guided in translation in a wear slee... | 02/22/2005 |
| 6799641 | Percussive drill with adjustable flow control A fluid channeling device is for a percussive drill including a casing having an interior space, drive and valve chambers defined within the interior space, a piston disposed within the casing and having an upper end disposeable within the drive chamber and a longit... | 10/05/2004 |
| 6782956 | Drive system having an inertial valve A drive system having a housing and including a frame supported in the housing and defining an axis. The frame is rotatable about the axis and defines an interior space. A piston supported by the frame is moveable axially in the interior space and is rotatable about... | 08/31/2004 |
| 6736218 | Diesel hammer systems and methods A diesel hammer system for driving piles. In one form of the invention, a control pinion is attached to a cam member employed to adjust the volume of a fuel portion of a pump chamber. A control rack is arranged to engage the control pinion such that linear movement ... | 05/18/2004 |
| 6698532 | Piercing apparatus A piercing apparatus compact in size having a decreased number of hoses is suited for use as an iron runner port-opening machine for a blast furnace or the like furnace in an iron mill. The piercing apparatus executes the piercing by moving back and forth... | 03/02/2004 |
| 6691798 | Variable hand pressure activated power tool A hand-held power tool for use in hand working operations including a hand pressure sensing element for adjusting the power of the tool. More specifically, the invention provides a hand engraving power tool that is activated from absence of power to much ... | 02/17/2004 |
| 6679340 | Hydraulic tool In the hydraulic tool, a main body section includes a cylinder and a piston. A head section is attached to the cylinder, includes a movable part. The piston is capable of rotating about the cylinder with the movable part. A control section is provided to ... | 01/20/2004 |
