| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 173206000 | Hammer head constitutes piston of drive motor | 34 |
| 20080230248 | Floating Piston _ an Oil Pressure Oscillation Dampening Device for Rock Drilling and Breaking Hammers - Floating pistons are implemented in hydraulic rock drilling hammer, or hydraulic hammer breaker, or fluid DTH hammer. The chambers confined by the impact piston and the body case are connected via ports and the floating pistons. The pistons balance the pressure difference when pressure pulsation happens in the chambers during the reciprocating movement of impact piston. It dampens the pulsation, prevents cavitations and assists the forwarding and returning movement of impact piston. The device will also be potential to increase the efficiency and impact power of hammers. | 09-25-2008 |
| 20090095498 | Percussive Device for a Rock Drilling Machine, Method for Achieving a Reciprocating Piston Movement and Rock Drilling Machine - A percussion device ( | 04-16-2009 |
| 20100084152 | PERCUSSION DEVICE ACTUATED BY A PRESSURIZED NON-COMPRESSIBLE FLUID - According to the invention, the body of the apparatus includes a flow rate adjustment device including a calibrated opening provided on a high-pressure fluid supply circuit, a bore formed in the body and in which is mounted a slider having a first face located in a first chamber connected to a high-pressure fluid supply circuit upstream from the calibrated opening and a second face located in a second chamber connected to the high-pressure fluid supply circuit downstream from the calibrated opening, the bore receiving the slide including an annular groove connected to a low pressure feedback circuit. The slider is adapted for connecting the annular groove to the first chamber when the pressure difference on either side of the calibrated opening increases beyond a predetermined value in order to divert a portion of the fluid flow supplied by the high-pressure fluid supply circuit to the feedback circuit. | 04-08-2010 |
| 20100155096 | FAIL-RESISTANT HAMMER ASSEMBLY FOR A VALVELESS PERCUSSIVE DRILL - In a valveless percussive drill of the hydraulic type and incorporating a hammer assembly, an “intermediate” shoulder between the head portion and cushion portion of a reciprocating piston engages the end face of a distributor or liner, rather than an interior bearing structure for the piston. This end face can be made harder than the ulterior bearing structure, which may include a surface made of a different material than the piston. Collectively, the result is a percussive drill with the hammer assembly incorporating the piston substantially less susceptible to failure due to galling as the result of contamination in the working fluid. | 06-24-2010 |
| 20100193211 | PNEUMATIC HAMMER MECHANISM - A pneumatic hammer mechanism is disclosed. The hammer mechanism includes: a flying mass; 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 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 following inequality applies for the mass (m | 08-05-2010 |
| 20120152582 | 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 an engaging structure which permits the engagement of the upper housing member with the lower housing member by relative rotation of the upper and lower housing members, such that each of the lower and upper housing members defines a portion of the chamber. The upper housing member is a precision component which contains the hydraulic components or other drive components necessary to drive the piston, while the lower housing member can be manufactured separately since it does not need to be manufactured to the high tolerances required by the upper housing member. The resulting tool assembly may be more compact than a conventional tie rod tool assembly. | 06-21-2012 |
| 20150060099 | MACHINE TOOL - A machine tool is disclosed. The machine tool has a tool receptacle for receiving a tool on a working axis, a housing, and a striking mechanism. An impact stop is provided for a beater or an intermediate beater. An impact absorber has two polymer-based absorber rings that are offset axially to one another and are disposed so that they overlap radially and has two iron-based disks disposed axially between the absorber rings. | 03-05-2015 |
| 20150360358 | DEVICE FOR PROVIDING ACCESS TO A SPACE - The present invention relates to a device for providing access to a space, wherein the space is provided with an access element, such as for instance a door or window, wherein the device is provided with pressing means for exerting an impact force on one or more parts of the access element, such as for instance a door frame, comprising:
| 12-17-2015 |
| 20160097176 | Hydraulic pole tamper handle and adapter - A hydraulic pole tamper with an extended ergonomic handle including a frame and hose clamps to extend the life of the hose by securing the hoses to the frame and to improve the handle, orientation, and usability of the pole tamper. The pole tamper is used to tamp or compact the dirt around a pole which has been set into a hole in the ground to fixedly secure the pole vertically in the ground. | 04-07-2016 |
| 20160138238 | IMPROVEMENTS IN & RELATING TO PILE AND POST DRIVING EQUIPMENT - The present invention is directed to an impact driver, which relies on multiple connected piston and cylinder assemblies which sequentially fire; a first auxiliary piston assembly charged to compress a compressible fluid with a piston rapidly releases the charge on said piston allowing the compressed fluid, which is typically a gas, to accelerate said auxiliary piston. This auxiliary piston is connected to a second travelling primaty piston assembly which it accelerates. Within the primary piston assembly a primary piston can be charged to compress a compressible fluid. The charge on the primary piston can also be rapidly released to accelerate the primary piston. The primary piston may be connected to a striking element, or successive travelling piston and cylinder assemblies which ultimately connect to a striking element. | 05-19-2016 |
| 20160138728 | Valve of a Hydraulically Striking Device - A valve of a hydraulically striking device having a housing, the housing comprising a moving member being seated inside the housing to move in a reciprocating manner by means of a hydraulic fluid. The moving member has an inner space, the valve has a return space and a pressure space provided, in the axial direction, at a distance from one another on the inner surface of the housing facing the moving member, wherein the rest of the inner surface of the housing in the same axial positions of the return space and the pressure space forms guide surfaces that are concentric with the moving member and against the moving member for centering the moving member. | 05-19-2016 |
| 20180021604 | BREACHING ASSIST TOOL | 01-25-2018 |
| 173207000 | Having valve not directly associated with motive fluid for piston | 10 |
| 20090250234 | Percussion Equipment Driven by a Pressurized Incompressible Fluid - The equipment comprises a body ( | 10-08-2009 |
| 20090283284 | PNUEMATIC DRIFTER WITH REPLACEABLE FOOT PIECES - Pneumatic drifters containing a drifter cylinder with removable feet and associated methods for using the pneumatic drifters are described. The removable feet are connected to feet pad of a drifter cylinder with multiple fasteners. The mating surfaces of the feet and the feet pad are provided with complimentary features that limit the shearing forces on the fasteners during operation of the drifter rock drill. The removable feet can be replaced quickly and easily without have to replace the entire drifter cylinder, thereby saving time and reducing costs. Other embodiments are also described. | 11-19-2009 |
| 20120138328 | Sleeve/Liner Assembly And Hydraulic Hammer Using Same - A hydraulic hammer includes a powercell housing that defines a hydraulic inlet and a hydraulic outlet. A machine mount that defines a plurality of pin receiving bores is attached to the powercell housing. A work tool is partially received in, and movable with respect to, the powercell housing. A switching spool valve member is positioned in the powercell housing and is movable between a first position and a second position, and includes a control hydraulic surface. A sleeve/liner assembly is positioned in the powercell housing and defines a centerline. A piston with a plurality of hydraulic surfaces is positioned in the sleeve/liner assembly and is movable along the centerline between a first position in contact with the work tool and a second position out of contact with the work tool. The control hydraulic surface of the switching spool valve member is exposed to fluid pressure in a switching passage, which includes a segment defined by the sleeve/liner assembly. | 06-07-2012 |
| 20160151903 | HAMMER HAVING PISTON SLEEVE WITH SPIRAL GROOVES | 06-02-2016 |
| 20160176033 | HYDRAULIC HAMMER HAVING VARIABLE STROKE CONTROL | 06-23-2016 |
| 173208000 | With accumulator | 5 |
| 20090065230 | Impulse generator and impulse tool with impulse generator - The invention relates to an impulse generator ( | 03-12-2009 |
| 20130186667 | HYDRAULIC IMPACT MECHANISM FOR USE IN EQUIPMENT FOR TREATING ROCK AND CONCRETE - A hydraulic impact mechanism, of the valveless impact mechanism type, comprising a pre-charged gas accumulator connected to a working chamber in order to make possible impact mechanisms for equipment for rock drilling and hydraulic breakers that is lighter, cheaper and more sustainable from the point of view of material fatigue. Furthermore, a gas accumulator of piston type with an integral brake chamber ( | 07-25-2013 |
| 20140262406 | HYDRAULIC HAMMER HAVING CO-AXIAL ACCUMULATOR AND PISTON - A hydraulic hammer is disclosed having a piston and an accumulator membrane disposed external and co-axial to the piston. Additionally, a sleeve is disposed between the piston and accumulator membrane, wherein the sleeve has a plurality of radial passages formed therein that fluidly connect the accumulator membrane with the piston. | 09-18-2014 |
| 20140262407 | HYDRAULIC HAMMER HAVING IMPACT SYSTEM SUBASSEMBLY - An impact system for a hydraulic hammer is disclosed. The impact system may include a piston, a sleeve disposed co-axial with the piston, and an accumulator membrane disposed external to the sleeve. A first seal may be located at an end of the sleeve, and configured to connect the sleeve to the piston. The accumulator membrane may have an extension configured to engage a recess in the sleeve. | 09-18-2014 |
| 20160001432 | BREAKING DEVICE - A breaking device includes a frame, an impact device having a pressure chamber with a rear pressure chamber and a front pressure chamber. The breaking device further includes a first low pressure port at the rear pressure chamber, a first low pressure channel and a first low pressure accumulator connected to the first low pressure channel. The breaking device further includes a second low pressure port at the rear pressure chamber substantially opposite to the first low pressure port, second low pressure channel and a second low pressure accumulator connected to the second low pressure channel. The first low pressure accumulator and the second low pressure accumulator are arranged at the outer circumference of the frame of the breaking device at different positions in the axial direction of the breaking device. | 01-07-2016 |
| 173209000 | Driven by internal combustion engine | 4 |
| 20090071672 | DIESEL PILE HAMMER - The invention relates to a diesel pile hammer ( | 03-19-2009 |
| 20100101816 | FUEL-POWERED ROCK BREAKER - The invention relates to a fuel-powered breaker machine ( | 04-29-2010 |
| 20130098650 | PERCUSSION TOOL HAVING COOLING OF EQUIPMENT COMPONENTS - A percussion tool has a cooling air channel for guiding a cooling air flow from a cooling air fan to an outside wall of a cylinder of an internal combustion engine. The cooling air channel is tapered to the extent that partial cooling air flows guided between the respective cooling fins are branched off the main cooling air flow. In such a way, the flow rate of the cooling air flow in the cooling air channel remains substantially constant, resulting in optimized engine cooling. The cooling air channel may be divided into two cooling air channels downstream of the cylinder. One of the cooling air channels guides cooling air to an exhaust gas system of the internal combustion engine, while the other cooling air channel guides cooling air to an outside wall of the guide housing of a hammer mechanism. | 04-25-2013 |
| 20130255985 | Portable Jackhammer - A portable, self-contained jackhammer system is described. The jackhammer system can include an internal combustion engine in a jackhammer housing. The internal combustion engine can have a piston driven by the combustion of a fuel. The piston can include a first portion and a second portion, the second portion can be configured to contact a chisel disposed at a distal end of the housing. The piston can be biased by a spring disposed in the housing and surrounding the piston. | 10-03-2013 |
| 173135000 | Motive fluid applied to striking face | 6 |
| 20090101378 | Water Powered Impulsive Unit - An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters. | 04-23-2009 |
| 20100193208 | FLUID DISTRIBUTOR CYLINDER FOR PERCUSSIVE DRILLS - A fluid distributor cylinder is for a percussive drill assembly that includes a casing having an inner circumferential surface defining a central bore, a central axis extending through the bore, a bit movably coupled with the casing and a piston movably disposed within the casing bore. The distributor cylinder includes a generally tubular body disposeable within the casing bore and having first and second ends, a central axis extending generally between the first and second ends, an outer circumferential surface. At least a section of the outer surface is configured to engage with the inner surface of the casing so to form an interference fit between the body and the casing. The cylinder includes an exterior thread and/or a radially-extending shoulder configured to releasably engage with the casing inner surface so as to substantially prevent axial displacement of the distributor body with respect to the casing. | 08-05-2010 |
| 20140231115 | DIESEL HAMMER PILE DRIVER - A pile-driving apparatus includes a diesel hammer pile driver having a cylinder, and a piston and a striker displaceably guided therein. A combustion chamber opens into a fuel feed device for introducing a predetermined amount of fuel into the combustion chamber during each working cycle. A disengagement apparatus axially displaceable on the cylinder outside is disposed within the cylinder, to raise the piston, has a driver introduceable into a piston undercut, through a piston recess, and has an operating lever for pivoting the driver into the cylinder space if a collision with the engagement cam occurs. A disengagement cam on the cylinder above the engagement cam pivots the driver out of the cylinder space if the operating lever collides with the disengagement cam. The engagement cam and/or the operating lever is configured for movement out of the collision region of the operating lever or of the engagement cam. | 08-21-2014 |
| 20150129270 | DIESEL HAMMER PILE DRIVER - A diesel hammer pile driver has a cylinder, a piston displaceably guided in the cylinder and a striker displaceably guided in the cylinder. The striker is disposed underneath the piston in the operating position of the diesel hammer pile driver. A combustion chamber is delimited axially by a face surface of the striker that lies in the interior of the cylinder and by a face surface of the piston, and opens into a fuel feed device connected with a fuel tank disposed on the outside of the cylinder. Using the fuel feed device a predetermined amount of fuel can be introduced into the combustion chamber during each working cycle. The fuel tank is elastically mounted on the cylinder. | 05-14-2015 |
| 20150129271 | DIESEL HAMMER PILE DRIVER - A diesel hammer pile driver has a cylinder, a piston displaceably guided in the cylinder and a striker displaceably guided in the cylinder. The striker is disposed underneath the piston in the operating position of the diesel hammer pile driver. A combustion chamber is delimited axially by a face surface of the striker that lies in the interior of the cylinder and by a face surface of the piston, and opens into a fuel feed device. Using the fuel feed device a predetermined amount of fuel can be introduced into the combustion chamber during each working cycle. At least two working connectors are disposed to pass through the circumference wall of the cylinder at the level of the fuel feed device, wherein at least one working connector is provided with a muffler device. | 05-14-2015 |
| 173136000 | Supplied through passage in striking face | 1 |
| 20150376949 | A FLUID PRESSURE DRIVEN, HIGH FREQUENCY PERCUSSION HAMMER FOR DRILLING IN HARD FORMATIONS - A fluid pressure driven, high frequency percussion hammer for drilling in hard formations is presented. The hammer piston ( | 12-31-2015 |
| 173138000 | With means to conduct motive fluid to or from striking face | 2 |
| 20090260842 | Pneumatic impact piercing tool - A reversible, pneumatic ground piercing tool has a tail assembly with exhaust passages therethrough. At least a portion of each exhaust passage angles radially inwardly and ends in discharge ports that communicate with a central hole at the rear end of the tail assembly, whereby exhaust escapes through the central hole. A tail cone has a radially inwardly extending flange on the inner periphery of the central hole, which flange is rearwardly spaced from and covers the discharge ports. | 10-22-2009 |
| 20140110141 | Hammering Apparatus - Hammering apparatus functioning with a pressurized medium, such as a pressure fluid of a hydraulic system which hammering apparatus comprises an elongated body ( | 04-24-2014 |
