Class / Patent application number | Description | Number of patent applications / Date published |
173200000 | Hammer head driven by pulsating fluid pressure | 43 |
20080223595 | Pile Driver - A pile driver provided with a housing and at least one body connected with the housing so as to be movable back and forth over a predetermined path, the pile driver being further provided with a drive for moving the body back and forth over the path for the purpose of pile-driving, the pile driver comprising at least two parts movable relative to each other, respectively having at least a first type of sliding surface and at least a second type of sliding surface which during pile-driving slide along each other and between which there is a lubricant, wherein the first type of sliding surface is provided with polyether ether ketone. | 09-18-2008 |
20080283263 | AIR TOOL - An air tool is composed of a main rod, a sleeve, a compression spring and a connector. The main rod possesses a plugging bar, a blocking annular surface, and a through bar having a connecting portion in its end portion. The through bar is mounted with the compression spring and inserted in the sleeve. The sleeve has a blocking annular surface to block the compression spring. The connector is screwed with the end of the main rod. In addition, via the elastic counterforce of the compression spring, the impact of the air tool generated while operating the air tool can be weakened so as to prevent the air tool from being damaged and enable a user to hold the air tool easily. | 11-20-2008 |
20090044962 | Intensifying cylinder - An intensifier is operable to supply force and includes a housing defining a cavity. A ram is slidably positioned within the cavity and partially extends from the housing. The ram is moveable between retracted and extended positions along a longitudinal axis. First and second links are rotatably coupled to one another about an axis of rotation and are selectively moveable between retracted positions where the axis of rotation is not axially aligned with the ram and partially extended positions where the axis of rotation is axially aligned with the ram. The intensifier includes a plurality of power pistons axially aligned with each other and the ram. The power pistons are selectively operable to provide an output force to the ram when the first and second links are in the partially extended positions. | 02-19-2009 |
20090301744 | Jet Hammer - An exemplary embodiment of the jet hammer includes an outer sleeve, impact assembly, and a valve assembly. The impact assembly is positioned in sliding relation to the outer sleeve to provide the impact of the jet hammer. The valve assembly generally comprises a cap screw, adjustment sleeve, valve port, inner compression spring, outer compression spring, and lock nut. The inner compression spring is relatively less compressible than the outer compression spring. In operation, fluid enters the valve assembly and acts on the compression springs forming an operational seal between the valve assembly and the impact assembly. In response, the outer sleeve is slidingly displaced from the impact assembly thereby compressing a main compression spring positioned along the mandrel shaft. Once the pressure acting on the valve assembly is released, the main compression spring decompresses forcefully causing the outer sleeve to impact a connection port, bit, tool, or other member attached to the upper end of the mandrel. This impact is translated onto the obstruction or item to be struck. The impact assembly may also be capable of rotational movement with respect to the outer sleeve wherein the mandrel shaft may contain at least one rotation nozzle thereon. The rotation nozzles allow for fluid communication from the mandrel's internal bore, through the nozzles, and against the proximate inner wall of the outer sleeve. This interaction causes the mandrel, and by connection the connection port, bit, tubing, or tool attached thereto, to rotate during the downward stroke of the hammer. Rotation nozzles may be located on the connection port and/or bit for additional rotational force. | 12-10-2009 |
20100012341 | PNEUMATIC SCREW DRIVER AND STOP CONTROL METHOD FOR AIR MOTOR IN PNEUMATIC SCREW DRIVER - A pneumatic screw driver includes: a tool body; a nose portion; a main air chamber; a hammering cylinder; a driver bit integrally combined with a hammering piston in the hammering cylinder; an air motor; a valve housing provided in an air passage between the main air chamber and the air motor; a stop valve piston provided in the valve housing; a stop valve stem coaxially provided with the stop valve piston; a timer chamber connected to the hammering cylinder; a first pipeline and a second pipeline respectively formed at upper and lower positions in a lower portion of the stop valve stem; and a upper end proximal portion of a contact member provided slidably in a driving direction. The upper end proximal portion of the contact member is provided engageably with the stop valve stem. The first pipeline and the second pipeline are arranged so as to close the first pipeline after closing the second pipeline by moving the stop valve stem upward from a bottom dead center. | 01-21-2010 |
20100181087 | HOUSING JOINT FOR A POWER TOOL - A power tool having a housing divided into two parts which are interconnected by a thread joint. Internal threads are provided on the housing parts. A tubular connection element has two external axially spaced thread sections which are provided for engagement with the internal threads on the housing parts. The tubular connection element has a thin walled waist section located between the external thread sections to provide a certain elastic deformation as a tightening torque is applied on the thread joint to thereby increase the clamping length of the thread joint. A resilient ring is carried on the waist section and is arranged to be elastically deformed by squeezing between the housing parts and the connection element at tightening of the thread joint, thereby providing a rotation locking friction force on the thread joint. | 07-22-2010 |
20100307784 | PROPORTIONAL PILOT-CONTROLLED PNEUMATIC CONTROL SYSTEM FOR PNEUMATICALLY POWERED HAND-HELD TOOLS - A control system for use in conjunction with a primary power system and operable to control a pneumatically powered hand-held tool broadly comprises an air delivery assembly operable to communicate with a pressurized air source; a control assembly including an exhaust line from the primary power system and to the control assembly, a spool valve in fluid communication with the supply line and the exhaust line, and a control line in fluid communication with the spool valve and the hand-held tool; a tool assembly comprising the hand-held tool for performing delicate hand working operations; and a housing for at least partial storage of the air delivery assembly and the control assembly. The primary power system and the control system operate in conjunction with each other to both power and precisely control a pneumatically powered hand-held tool. | 12-09-2010 |
20110083869 | QUICK ASSEMBLY PNEUMATIC TOOL - A quick assembly pneumatic tool may be connected to a tool bit and has a housing, an anvil casing, a rear cover, an air inlet assembly, a rotor assembly and an impact assembly. The housing has a handle and a rotor casing. The rotor casing is formed on the handle and has a front chamber and a rear chamber. The anvil casing and rear cover respectively cover the front and rear chambers. The rotor assembly is mounted in the rear chamber and is selectively driven by the air inlet assembly. The impact assembly is mounted in the front chamber and the anvil casing and is selectively rotated by the rotor assembly. The separate rotor and anvil casings allow the rotor and impact assemblies to be inserted respectively in the front and rear chambers so that assembling the pneumatic is easy and quick. | 04-14-2011 |
20110108301 | Handheld power tool - The handheld power tool ( | 05-12-2011 |
20110174512 | PRESSURISED AIR PICK DEVICE WITH VARIABLE CONTROL - Pressurised air pick device with variable control that comprises a cylinder and piston assembly for actuating a picking member, and a distribution portion with variable control of the pressurised air to said cylinder and piston assembly, the distribution portion including an upper body, a lower ring and a movable fluid-distribution slider capable of sliding between the body and the ring, characterised in that the distribution portion is housed in the cylinder of the cylinder and piston assembly at the upper portion thereof and coaxially therewith, the variable control for the fluid is housed in the head of the cylinder closing the upper portion of the cylinder connected to a fluid-supply section, and said upper portion of the cylinder includes two channels for conveying pressurised air in tight communication with the distribution portion through the radial channels thereof. | 07-21-2011 |
20110186321 | Pneumatically Powered Impact Device and Method - A pneumatic impact device and method provide a high powered striking force against a target object. The device includes a core shell that houses a piston sub-assembly and a sear arm sub-assembly, and that further defines a forward gas chamber and a rearward gas chamber. The rearward gas chamber is loaded with compressed fluid via a handle actuator. A mostly external sear trigger assembly responds to the impact of a striker plate against the target object, thereby releasing a sear arm that then releases a piston, which is then accelerated forward by the compressed fluid charge. The device can be re-set manually via compressed fluid (e.g., air) in one embodiment, or automatically via a spring mechanism in another embodiment. | 08-04-2011 |
20120073846 | POWER TOOL - An oil pulse tool including: a brushless motor which includes stator windings; a drive circuit configured to apply a driving voltage to any of the stator windings of the brushless motor at a predetermined timing; an oil pulse mechanism portion configured to be rotary driven by the brushless motor; and an output shaft which is connected to the oil pulse mechanism portion, wherein the drive circuit changes an advance angle of the driving voltage in accordance with a rotational position of the oil pulse mechanism portion. | 03-29-2012 |
20120234571 | IMPACT TOOL - A hammer drill includes, in a cylinder accommodated in a housing, a piston configured to advance and retract and an impact element to operate together with the piston with an air chamber interposed therebetween, and a bit mounted in a front part of a tool main body so that an impact operation can be transmitted to the bit by advancing and retracting movement of the impact element. Vent holes are provided in the cylinder, and configured to discharge air in the air chamber to outside of the cylinder, and to introduce the air outside the cylinder into the air chamber by the movement of the piston. One of the vent holes is located at a center of an upper half of a periphery of the cylinder and the other vent hole is located in a lower half of the periphery of the cylinder. | 09-20-2012 |
20120267138 | HAND-HELD POWER TOOL AND PRODUCTION METHOD - A production method provides for punching holes in a metal strip, cold-forming the metal strip to form a guide tube, and joining the lengthwise edges of the metal strip to each other by a seam or teeth so as to create a uniform material. Subsequently, a piston-like striker is inserted into the guide tube. | 10-25-2012 |
20120298393 | Machine Tool - The machine tool according to the with a pneumatic hammer mechanism comprises a motorized exciter, a guiding tube, and a piston-shaped beater. The piston-shaped beater is guided by an interior surface of the guiding tube along an operating axis and with the exciter encloses an air spring in a guiding tube. The beater shows a cup-shaped basic body with an open hollow space facing the exciter and an inset filling the hollow space. The basic body is made from a first material with a first density and the insert is made from a material with a second density, which is lower than the first density. | 11-29-2012 |
20120305280 | Rock Drilling Machine And Use Thereof For Hindering Occurrence And Spreading Of Cavitation Bubbles - Rock drilling machine ( | 12-06-2012 |
20130000939 | HYDRAULIC PERCUSSIVE ARRANGEMENT, PISTON GUIDE AND DRILLING RIG - The present invention relates to a hydraulic percussive arrangement comprising a displaceable arrangement ( | 01-03-2013 |
20130199813 | Hydraulic Hammer - A piston cylinder is formed inside a ram and is fitted with a piston attached to a stationary hollow piston rod, creating a upper piston chamber for receiving pressurized hydraulic fluid, which causes the ram to rise as the volume of the upper piston chamber is expanded due to the hydraulic pressure and increasing volume of hydraulic fluid. When the ram reaches predetermined desired height, hydraulic pressure is released by opening a directional valve, allowing the ram to drop. A lower piston chamber is sealed and filled with gas. A moveable shuttle member that reciprocates up and down inside a hollow piston rod in response to the changing volume of the lower piston cylinder, facilitating the evacuation of hydraulic fluid from the upper piston chamber. An alternative embodiment uses a single fluid and has no shuttle member. | 08-08-2013 |
20130327555 | DEVICE FOR ROCK AND - CONCRETE MACHINING - The invention concerns a hydraulic striking tool for application in rock and/or concrete cutting equipment containing a machine housing ( | 12-12-2013 |
20140174779 | HIGH FREQUENCY FLUID DRIVEN DRILL HAMMER PERCUSSION DRILLING IN HARD FORMATIONS - A fluid pressure driven, high frequency percussion hammer for drilling in hard formations is presented. The hammer piston ( | 06-26-2014 |
20150144369 | Hammer Raising Device - There is provided a hammer raising device. The hammer raising device is configured to increase striking intensity by eliminating fluid resistance when a piston raised upward moves downward. To achieve this, the hammer raising device includes a hydraulic control valve that controls a supply of a fluid, a sub cylinder to which the fluid is supplied by an operation of the hydraulic control valve, a sub piston that is partially accommodated within the sub cylinder, and is raised or lowered by the fluid, a main piston that comes in close contact with a longitudinal end of the sub piston to be raised by the raising of the sub piston, and is lowered when the closely contacted longitudinal end of the sub piston is separated, and a main cylinder that accommodates the main piston. | 05-28-2015 |
173201000 | Pulsation caused by mechanical movement | 22 |
20080217040 | Hand-held power tool with pneumatic percussion mechanism - A hand-held power tool includes a percussion power tool includes a percussion piston ( | 09-11-2008 |
20080236855 | Electric Power Tool - An electric power tool, in particular an electric hammer, having a drive unit ( | 10-02-2008 |
20080245542 | Hammer drill - It is an object of the invention to provide an improvement in ease of operation of a driving mode switching mechanism in a hammer drill. According to the invention, a representative hammer drill includes a driving mode switching mechanism which has an operating part, a first switching member and a second switching member. The operating part can be turned to at least three rotating positions in its circumferential direction, while the operating part can be turned 360° on the rotation axis in the both directions. Thus, the user can select the desired driving mode in the shortest turning distance without passing through an unnecessary driving mode position. Therefore, ease of operation in mode change can be enhanced. | 10-09-2008 |
20090008117 | Pulse Tool and Associated Front Plate - A pulse tool, in particular a pulse nutsetter, has a drive unit and a pulse unit driven by it. The pulse unit has at least one rotor with at least two vanes, a hydraulic cylinder surrounding it and a drive spindle protruding at one end out of the hydraulic cylinder through a front plate. The front plate is arranged between the rotor and a front cover, said cover being formed with a hydraulic fluid filling device. In order to improve a pulse tool of this nature, in that deviations from the desired pulse frequencies can be compensated in a simple manner and in particular already during the assembly of the pulse tool, the front plate has at least one bypass opening connecting the high-pressure and low-pressure chambers which are separated by the vanes. The invention also relates to an appropriate front plate. | 01-08-2009 |
20090126962 | ACTUATION APPARATUS FOR POWER TOOL - When the mode change knob of a multi-mode hammer drill is moved to the hammer only position, an electronic sensor sends a signal to a control logic circuit. When the user then depresses the trigger mechanically closing the ON/OFF switch, the control logic circuit applies a voltage either to a holding relay or to the gate of a triac which enables the relay or triac to conduct, thus providing a parallel circuit by-passing the ON/OFF switch. Consequently, when the user releases the trigger and opens the ON/OFF switch, the parallel relay or triac maintains current flow to the motor. It can be seen that in hammer only mode the user can activate the hammer drill by simply tapping the trigger to depress it and does not need to hold down trigger during use of the hammer in operation. | 05-21-2009 |
20090133893 | Hand-held power tool with a pneumatic percussion mechanism - A hand-held power tool includes a pneumatic percussion mechanism having a percussion piston reciprocating along a percussion axis and having a bore extending at an angle to the percussion axis, and an air spring for displacing the percussion piston. | 05-28-2009 |
20090145620 | Hand-held power tool with a chuck and an associated working tool - A hand-held power tool for at least percussively driving a working tool ( | 06-11-2009 |
20090272555 | PULSE MACHINE, METHOD FOR GENERATION OF MECHANICAL PULSES AND ROCK DRILL AND DRILLING RIG COMPRISING SUCH PULSE MACHINE - According to one aspect of the invention hydraulic pressure pulses are created in a rock drill machine utilizing a rod ( | 11-05-2009 |
20090277659 | HAMMER DRILL - A hammer drill for manually guided operation includes an electric drive motor, a tool spindle and a pneumatic hammer function. The hammer drill includes a pressure piston, a striker, and a beat piece for striking axially against a tool that is held by the tool spindle. When the striker reaches a forward limit position, an end section thereof protrudes into a retaining ring that is aligned coaxially with the spindle axis. Manufacturing quality can be improved by bracing the retaining ring against an annular collar in the tool spindle on the one side and axially against a locking ring set in an annular groove conformed in the tool spindle via a retaining disc on the other side. The retaining ring, the retaining disc and the non-return disc are each mirror-symmetrical. | 11-12-2009 |
20100059242 | PERCUSSION DEVICE - The invention relates to a percussion device having a body and a percussion piston moving therein, pressure fluid spaces in the rear and front ends of the percussion piston and pressure fluid channels for feeding pressure fluid into the percussion device. The percussion piston and the control valve comprise surfaces, which, when aligned, substantially close the pressure fluid flow from the pressure fluid space locating behind the percussion piston in front of the control valve, whereby the produced pressure displaces the control valve to another position. | 03-11-2010 |
20100224383 | PNEUMATIC HAMMER MECHANISM - A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; a hammer piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and hammer piston; and a drive for periodically moving the hammer piston with a stroke along the impact axis. The flying mass is excited to a periodic movement between the impact surface and a minimum approach of the hammer piston. A length ratio of the maximum length of the pneumatic chamber to the stroke is selected as less than 1.55. | 09-09-2010 |
20100263894 | Pneumatic striking mechanism and hand-held power tool - A pneumatic striking mechanism includes a guide cylinder in which a freely moving piston and an exciter piston are arranged movably along a striking axis. The guide cylinder has a plastic. The striking mechanism includes a pneumatic chamber sealed off by the guide cylinder, by the freely moving piston and by the exciter piston, as well as a drive for periodically moving the exciter piston, as a result of which the freely moving piston is excited to execute a periodical movement between the striking surface and the exciter piston. | 10-21-2010 |
20100288521 | VIBRATION HAMMER - A vibration hammer is provided, including a main body; a striking unit having a piston housing installed to he elevated by a hydraulic pressure controlling valve unit installed in the main body, a hammer guide slidably installed on the main body to be coaxial with the piston housing, and a piston having both ends fixed to the piston housing and a hammer guide and elastically deformable at a predetermined angle with an elevating direction of the piston housing; and a rotating unit installed in the main body and reciprocally rotating the hammer guide elevated together with the piston. The vibration hammer can prevent the piston from being damaged by being elastically deformed when a lateral pressure applied to the rod connected to the piston. | 11-18-2010 |
20100300718 | Machine tool - The machine tool includes a pneumatic percussion mechanism having a cup-shaped exciter cylinder ( | 12-02-2010 |
20110000695 | PULSE GENERATING DEVICE AND A ROCK DRILLING RIG COMPRISING SUCH A DEVICE - The present invention relates to a pulse generating device for inducing a shock wave in a tool, wherein the said pulse generating device comprises an impact means ( | 01-06-2011 |
20120067606 | HYDRAULIC BREAKER - Disclosed is a hydraulic breaker. The hydraulic breaker includes a back head provided therein with a gas chamber; a cylinder assembled to a lower portion of the back head; a front head assembled to a lower portion of the cylinder; a piston moving up and down in the cylinder; and a chisel installed in the front head, wherein semicircular ring slots are defined in both sides of a bottom of the back head, both sides of a top of the cylinder, both sides of a bottom of the cylinder and both sides of a top of the front head, respectively, and fastening rings are installed in circular ring slots formed by joining the semicircular ring slots formed in both sides of the bottom of the back head to the semicircular ring slots formed in both sides of the top of the cylinder, and the fastening rings are installed in circular ring slots formed by joining the semicircular ring slots formed in both sides of the bottom of the cylinder to the semicircular ring slots formed in both sides of the top of the front head in order to assemble the back head, cylinder, and front head with each other. | 03-22-2012 |
20120211251 | Pulse Generator - A downhole tool comprises a pulse generator that can generate longitudinal pulses in a drill string. A poppet is longitudinally moved in and out of an orifice in the pulse generator reducing the flow of drilling mud temporarily, generating a longitudinal pulse. The longitudinal pulse generator may be combined with a conventional transverse pulse generator to create a pulse generator capable of generating pulses in both transverse and longitudinal directions. | 08-23-2012 |
20130161050 | ELECTRIC MOTOR DRIVEN TOOL FOR ORTHOPEDIC IMPACTING - An orthopedic impacting tool comprises a motor, an energy storage means, a striker, and an anvil. The motor stores energy in the energy storage means and then releases it, causing the striker to apply a controlled force on an adapter to create a precise impact for use in a surgical setting. The tool may further comprise a combination anvil and adapter. The tool further allows forward or backward impacting for expanding the size or volume of the opening or for facilitating removal of a broach, implant, or other surgical implement from the opening. An energy adjustment control of the tool allows a surgeon to increase or decrease the impact energy. A light source and hand grips improve ease of operation of the tool. | 06-27-2013 |
20130319712 | CHISELING POWER TOOL - A hand-held power tool is disclosed. The tool has a pneumatic striking mechanism. The striking mechanism includes a motor-driven exciter, a guide tube and a striker. A pneumatic spring configured inside the guide tube between the exciter and the striker is circumferentially sealed pressure-tight by an inner surface of the guide tube. The exciter and/or the striker are configured as a piston guided by the inner surface. An inner surface of the guide tube is provided with a plurality of molded depressions. | 12-05-2013 |
20140014383 | HAND-HELD POWER TOOL - The hand-held power tool has a tool socket, a motor and a pneumatic striking mechanism. The striking mechanism has an exciter driven by the motor along a working axis, a striker coupled to the exciter via an air cushion, and an intermediate striker arranged between the striker and the tool socket in the striking direction. The striking mechanism also has a guide in which the intermediate striker is guided. The guide has a first sliding surface that guides a first section of the intermediate striker, and a second sliding surface that is arranged offset relative to the first sliding surface in the striking direction and that guides a second section of the intermediate striker. A radial dimension of the first section of the intermediate striker is greater than a radial dimension of the second section of the intermediate striker. | 01-16-2014 |
20140318823 | ELECTRIC MOTOR DRIVEN TOOL FOR ORTHOPEDIC IMPACTING - An orthopedic impacting tool comprises a motor, an energy storage means, a striker, and an anvil. The motor stores energy in the energy storage means and then releases it, causing the striker to apply a controlled force on an adapter to create a precise impact for use in a surgical setting. The tool may further comprise a combination anvil and adapter. An energy adjustment control of the tool allows a surgeon to increase or decrease the impact energy. A light source and hand grips improve ease of operation of the tool. | 10-30-2014 |
20150101835 | Percussion Unit - Percussion unit, especially for a rotary hammer and/or percussion hammer, comprising a control unit which is designed for controlling a pneumatic percussion mechanism. According to the disclosure, the control unit comprises at least one load estimation device. | 04-16-2015 |