Hammer Head Constitutes Piston Of Drive Motor Patents (Class 173/206)
  • Patent number: 9803441
    Abstract: A retrievable core sampling assembly for latching to or relative to a rotatable tubular housing of a core sampling apparatus to allow the capture and retrieval of a core from a subterranean formation, the assembly comprising or including: a core catcher barrel for a core, the barrel being rotationally isolated from the tubular housing and cooperable with a core taking bit coupled to the rotatable tubular housing to retain a core, and a hammer for providing impact to the core taking bit along a longitudinal impact path that is or is substantially decoupled from the core catcher barrel so that when latched, rotation and impact of the core taking bit captures and passes core material from the formation to the core catcher barrel in manner that isolates a core in the core catcher barrel from rotation and impact forces.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: October 31, 2017
    Assignee: FLEXIDRILL LIMITED
    Inventor: Gregory Donald West
  • Patent number: 9784649
    Abstract: A silty floating mud collection device, which includes a drive cylinder, an outer sleeve, a sampler barrel, an lug cover plate, a turning cover, a control ring and a control rod, where the drive cylinder includes a cylinder liner, a piston and a piston rod; the outer sleeve is fixedly connected below the cylinder liner; the sampler barrel is detachably installed inside the outer sleeve; the lug cover plate is fixedly connected to a lower end of the piston rod, and can close an upper-end opening of the sampler barrel; the turning cover is turnably installed at a lower end of the outer sleeve, and can close a lower-end opening of the sampler barrel; the control ring is located below the sampler barrel, and is used to block the turning cover which is in an open state; and an upper end of the control rod is connected to the lug cover plate, and a lower end of the control rod is connected to the control ring.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: October 10, 2017
    Assignee: CCC THIRD HARBOR CONSULTANTS CO., LTD.
    Inventors: Jianding Niu, Jianping Hu, Zhiyong Chen, Zekun Cheng, Limin Cheng, Xiaojie Li, Jiaoshe Dong, Nianxi Wang, Zhaoming Wang
  • Patent number: 9724813
    Abstract: The invention concerns a hydraulic striking tool for application in rock and/or concrete cutting equipment containing a machine housing (100;200) with a cylinder (115;215) with a moveably mounted piston (145;245) which during operation performs a repetitive forward and backward movement relative to the machine housing (100;200) and directly or indirectly strike a rock and/or concrete cutting tool (155;255), and where the piston (145;245) includes a driving part (165;265) which separates a first (120;220) and a second (105;221) driving chamber formed between the piston (145;245) and the machine housing (100;200) and where these driving chambers are arranged to include a pressurized working fluid during operation. The total volume V of the first and second driving chambers is inversely proportional dimensioned to the square of a for the striking tool recommended maximal pressure p, as well as proportional, by a proportionality constant k within the interval 5.3-21.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: August 8, 2017
    Assignee: Atlas Copco Rock Drills AB
    Inventor: Maria Pettersson
  • Patent number: 9453403
    Abstract: The invention concerns a method to establish communication between the inner cavity of a drill string and the surrounding material down in a drill hole (60) during the use of a down-the-hole drill unit with a drill string (10), a down-the-hole hammer drill (1), and a source of pressurized medium (11) that delivers a medium under pressure to the down-the-hole hammer drill.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: September 27, 2016
    Assignee: LKAB WASSARA AB
    Inventor: Magnus Hörman
  • Publication number: 20150129269
    Abstract: An impact device and a method of dismounting an impact device from a breaking device is disclosed. The impact device includes a bush having a percussion piston disposed therein. The impact device is arranged inside an impact device space formed in a frame of a breaking device. The percussion piston is provided with a pull shoulder allowing a dismounting force in a return direction to be transmitted from the percussion piston to the bush. Thus, the bush is extracted from the frame by means of the percussion piston.
    Type: Application
    Filed: November 12, 2014
    Publication date: May 14, 2015
    Inventors: Timo MUUTTONEN, Mikko HÄMÄLÄINEN, Lars KANDELIN, Teemu HIETAKARI
  • Publication number: 20150060099
    Abstract: 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.
    Type: Application
    Filed: August 29, 2014
    Publication date: March 5, 2015
    Applicant: Hilti Aktiengesellschaft
    Inventors: Markus HARTMANN, Manfred Ludwig, Franz Moessnang
  • Patent number: 8955615
    Abstract: 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; an exciting piston which limits a movement of the flying mass opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; and a drive for periodically moving the exciting piston with a stroke along the impact axis.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: February 17, 2015
    Assignee: Hilti Aktiengesellschaft
    Inventors: Alexander John, Reinhard Schulz, Eduard Pfeiffer
  • Publication number: 20140314495
    Abstract: A pile driver system for installing or removing foundation elements, such as piles, anchors, and conductors, in a subsea ground formation, includes a closed housing defining a cavity, an impact weight accommodated inside the housing, a hydraulic circuit for reciprocating the impact weight, which circuit comprises one or more valves, a cylinder, and a piston accommodated in the cylinder and connected to the impact weight, a pump for withdrawing water from the surroundings of the pile driver and providing pressurized water to the hydraulic circuit, and at least one outlet for returning water to the surroundings. The exhaust of the hydraulic circuit communicates with the cavity and the outlet is located in the wall of the housing.
    Type: Application
    Filed: January 16, 2012
    Publication date: October 23, 2014
    Applicant: IHC Holland IE B.V.
    Inventors: Dirk Arentsen, Michael Schaap
  • Publication number: 20140262407
    Abstract: 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.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: CATERPILLAR INC.
    Inventor: Cody Moore
  • Patent number: 8776911
    Abstract: Disclosed is a hydraulic breaker.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: July 15, 2014
    Inventors: Young Seok Lee, Byeong Seo Goo
  • Patent number: 8770313
    Abstract: An impulse generator (1) for a percussive tool includes a chamber (3) for receiving a liquid volume and an impulse piston (4) which is arranged for transferring pressure pulses in the liquid volume into stress wave pulses in the tool. The chamber (3) is adapted with respect to its shape such that it forms a resonance chamber for liquid in the liquid volume for forming at least one pressure antinode (11,15,17) inside the chamber. The invention also concerns a method and a hydraulic impulse tool.
    Type: Grant
    Filed: March 20, 2006
    Date of Patent: July 8, 2014
    Assignee: Atlas Copco Rock Drills AB
    Inventors: Kenneth Weddfelt, Göran Tuomas, Risto Wisakanto
  • Patent number: 8763719
    Abstract: A pile driving system for driving a pile. The pile driving system comprises a housing assembly, a hammer, a helmet member, and a lifting system. The housing assembly defines at least one vent opening is arranged at a first vent location along the drive axis, and at least one vent opening is arranged at a second vent location along the drive axis. When the hammer drops and is above the first vent location, ambient air flows from the main chamber through the vent openings formed at the first and second vent locations. When the hammer is below the first vent location and above the second vent location, ambient air flows from the main chamber through the vent openings formed at the second vent location. When the hammer is below the second vent location, air within the main chamber is compressed to preload the helmet member.
    Type: Grant
    Filed: January 6, 2010
    Date of Patent: July 1, 2014
    Assignee: American Piledriving Equipment, Inc.
    Inventor: John L. White
  • Patent number: 8739896
    Abstract: A percussion device has a machine housing (1), a forwards and backwards movable percussion piston (2) in the machine housing, and a reciprocatingly movable valve body (6) in the machine housing. The percussion piston has a first (4) and a second (5) driving surface subjected to pressure to drive the percussion piston (2) forwards and backwards. The valve body (6) has a first end surface (12) and a second end surface (13) for driving the valve body in first and second directions by applied pressure. The valve body (6) is arranged over a channel (7) in the machine housing, to connect at least the second (5) driving surface alternately to a pressure source (8) or to low pressure (9), and the second end surface (13) is alternately connectable by the percussion piston (2) to the pressure source (8) or, over a valve device (11) for creating a counter-pressure, to the low pressure (8).
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: June 3, 2014
    Assignee: Atlas Copco Rock Drills AB
    Inventors: Kurt Andersson, Jörgen Rodert
  • Patent number: 8591153
    Abstract: The pneumatic drilling device includes: a ram provided inside a cylindrical body so that the ram can move forward and backward therein; a spindle air motor provided inside the ram; a feed air cylinder mechanism for moving the ram forward and backward; and an air supply port for supplying compressed air to the feed air cylinder mechanism and the spindle air motor through an airflow path. The airflow path includes: a first flow path for driving the spindle air motor; and a second flow path communicating with the feed air cylinder mechanism for moving the ram forward and backward. The first flow path and the second flow path are separately and independently provided in parallel.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: November 26, 2013
    Assignee: Sugino Machine Limited
    Inventors: Hideki Uchiuzo, Minoru Ihara
  • Patent number: 8540034
    Abstract: Pneumatic drill device comprising an outer casing, an assembly of a cylinder and a movable piston actuating a pick element, a device for supplying the cylinder with compressed air, an air exhaust device and an operational control device, wherein the outer casing is formed from two complementary sections adapted to fit into one another in order to enclose, in addition to the cylinder and piston assembly, the said devices for supplying the cylinder, for air exhaust and for operational control.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: September 24, 2013
    Assignee: Sullair Corporation
    Inventors: Julien Poncet, Alain Mucig, Patrice Charlat
  • Publication number: 20130168117
    Abstract: A battering apparatus including a battering element, an air source, a sensing device, a triggering mechanism, and a battering element release mechanism. Engagement of the sensing device activates the triggering mechanism which in turn activated the battering element release mechanism. The battering element is then released, and driven by air from the air source, moved to its extended position, causing the battering head of the battering element to engage an item to be broken.
    Type: Application
    Filed: July 3, 2012
    Publication date: July 4, 2013
    Inventor: DAVID T. Krumrei
  • Patent number: 8424614
    Abstract: A hydraulic hammer comprising a housing (10) with a longitudinal bore (12), cylinder sleeve (14) supported in the bore (12) a rear and cover (16) closing the bore (12), and a hammer piston (15) reciprocally powered in the cylinder sleeve (14) for delivering blows to a working implement inserted in the guide sleeve (20) mounted at the front end of the bore (12). The hydraulic hammer also comprises a distribution valve (31), for directing pressure fluid to the hammer piston (15), communicating the pressure fluid source and the cylinder sleeve (14). The valve (31) comprises both a clearance seal means (44) and a seat seal (45, 46) for improved tightness.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: April 23, 2013
    Assignee: Atlas Copco Construction Tools AB
    Inventor: Stig Roland Henriksson
  • Patent number: 8267189
    Abstract: A hand-held power tool includes a motor-driven percussion mechanism. The percussion mechanism includes a guide tube (21) and a reciprocating driving member (22) displaceable in the guide tube (21) for driving, via a gas spring, an impact member (23) likewise displaceable in the guide tube (21). The percussion mechanism further includes a motor-driven eccentric wheel (17) rotatable about an axis (D) which is spaced from the percussion mechanism axis (S) in a direction perpendicular to the percussion mechanism axis (S) by a distance (X). A connection rod (29) is eccentrically supported on the eccentric wheel (17) and connected to the driving member (22) for converting a rotational movement of the eccentric wheel (17) into a reciprocating movement of the driving member (22).
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: September 18, 2012
    Assignee: Hilti Aktiengesellschaft
    Inventors: Erwin Manschitz, Reinhard Schulz, Alexander Loeffler
  • Publication number: 20120152582
    Abstract: 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.
    Type: Application
    Filed: February 29, 2012
    Publication date: June 21, 2012
    Inventor: Lauritz Phillip PILLERS, II
  • Patent number: 8196676
    Abstract: A recoilless hammer comprising a moil supported for reciprocal movement along a hammer axis of a housing, a piston moveable within the chamber of an elongate tube extending from the rear of the housing such that it may strike the moil. In a rest position the piston is held forward against the moil by a low pressure air supply delivered from the aft end of the chamber, and the piston is retracted to a charged position at the aft end of the chamber by delivery of high pressure air to act on the fore portion of the piston. Upon actuation of a trigger mechanism, air is vented from the fore end of the chamber to atmosphere causing a pressure unbalance of low magnitude across the piston, such that it accelerates towards and strikes the moil. The chamber is of a length to enable a high energy blow with minimal piston acceleration recoil when the hammer is manually held and operated.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: June 12, 2012
    Assignee: Russell Mineral Equipment Pty. Ltd.
    Inventor: Peter John Rubie
  • Patent number: 8167055
    Abstract: 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.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: May 1, 2012
    Assignee: Montabert
    Inventor: Bernard Piras
  • Patent number: 8151901
    Abstract: A pressure fluid operated impact device comprising a frame (2) whereto a tool (3) is mountable movably in its longitudinal direction, and control means (7) for controlling pressure fluid feed to the impact device (1), as well as a method of generating a stress pulse in a pressure fluid operated impact device. The impact device (1) comprises a working chamber (8) and a transmission piston (9) moving therein. Energy charging means for charging energy of pressure fluid and the control means are coupled to allow periodically alternately pressure fluid to flow to the working chamber (8) and, correspondingly, to discharge pressure fluid from the working chamber (8). In the method, pressure fluid is fed to the working chamber (8), which produces a force pushing the transmission piston (9) in the direction of the tool (3), thus generating a stress pulse in the tool (3).
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: April 10, 2012
    Assignee: Sandvik Mining and Construction Oy
    Inventors: Markku Keskiniva, Jorma Mäki, Mauri Esko, Erkki Ahola, Aimo Helin, Timo Muuttonen
  • Patent number: 8141655
    Abstract: 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.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: March 27, 2012
    Assignee: Caterpillar Inc.
    Inventor: Lauritz P. Pillers, II
  • Patent number: 8080029
    Abstract: Embodiments of systems and methods disclosed herein regard simplifying and improving the performance and reliability of pneumatic actuators operable to actuate surgical cutters or shears. Various embodiments include systems and methods for vitreous cutting apparatuses utilizing self-valving vitreous cutters that actuate at a frequency based on the properties of the vitreous cutter.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: December 20, 2011
    Assignee: Novartis AG
    Inventor: Steven T. Charles
  • Patent number: 8069928
    Abstract: A percussive device and method having, inside a machine housing (3), a reciprocally moveable percussive piston (2), the movement of which is controlled by a control valve (5), which is arranged to alternatively connect a chamber to a pressure source and to low pressure in dependence on a signal corresponding to the axial position of the percussive piston, and a valve (16) arranged to allow adjustment of the axial position of the percussive piston at which the signal is transmitted, by opening and blocking of a connection between one or more control channels (10, 11, 12, 13) and the control valve.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: December 6, 2011
    Assignee: Atlas Copco Rock Drills AB
    Inventor: Peter Birath
  • Patent number: 8051926
    Abstract: The present invention relates to a control device for an impulse-generating device for inducing a shock wave in a tool, in which said impulse-generating device comprises an impact element for transmitting said shock wave to said tool, a counter pressure chamber acting against the impact element and a device for reducing a pressure in the counter-pressure chamber. The control device comprises control means for regulating the reduction of the pressure in said computer-pressure chamber. The invention also relates to an impulse-generating device.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: November 8, 2011
    Assignee: Atlas Copco Rock Drills AB
    Inventor: Kenneth Weddfelt
  • Patent number: 8033343
    Abstract: 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.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: October 11, 2011
    Assignee: Glencross Limited
    Inventors: Alan Barrows, Douglas Barrows
  • Patent number: 8028772
    Abstract: A percussion drill, and methods of using the same, including a shank in mechanical alignment with a piston-hammer and a valve in fluid communication with the piston-hammer. The percussion drill further includes an internal hydraulic dampening system for reducing the velocity of the piston-hammer when the shank is forward of a power position relative to the velocity of the piston-hammer when the shank is in a power position. Preferably, the internal hydraulic dampening system includes mechanical alignment of a portion of the piston-hammer with a port in fluid communication with the valve, operable to reduce fluid flow into an area surrounding the valve when the piston-hammer is forward of its position relative to its normal operation.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: October 4, 2011
    Inventors: William N. Patterson, Glenn R. Patterson
  • Patent number: 7992652
    Abstract: 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.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: August 9, 2011
    Assignee: Atlas Copco Secoroc LLC
    Inventor: Timothy J. Plunkett
  • Patent number: 7975777
    Abstract: A device for impacting a fastener in one embodiment includes a drive channel, a cylinder opening at an end portion to the drive channel, a microcellular polyurethane elastomer (MPE) bumper fixedly positioned at the end portion of the cylinder, the MPE bumper including a drive bore extending therethrough and aligned with the drive channel, and an outer wall defining a plurality of grooves extending radially about the MPE bumper, and a drive mechanism including a drive blade aligned with the drive bore.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: July 12, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Harald Krondorfer, Yizhuo Zhang
  • Patent number: 7896102
    Abstract: 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 pneumatic drive (2). The control valve (25 and 26) comprises least one air economy setting (30) setting a choke cross section and a high power setting (29) defining a flow cross section larger than it. An actuator serves to ensure that the control valve is switched over, in a fashion dependent on the air pressure obtaining in the at least one working chamber (12 and 13) from the normally assumed air economy setting (30) into the high power setting (29), when the output drive unit (7) meets with an increased resistance to motion.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: March 1, 2011
    Assignee: Festo AG & Co. KG
    Inventors: Ulrich Hirling, Ute Casimir
  • Patent number: 7775160
    Abstract: The invention relates to a device and to a method for producing pressure waves of a high intensity. Thereby, a flowable, explosive substance, or flowable components which form an explosive mixture on mixing and are preferably gaseous, are introduced into a pressure-tight container and ignited. The gas pressure arising from the ignition is led away through a previously closed passage. Preferably, a closure is kept closed by way of a spring element until the explosion, wherein the spring element comprises a relief device.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: August 17, 2010
    Assignee: Explo Engineering GmbH
    Inventor: Hans Ruegg
  • Publication number: 20100193211
    Abstract: 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.
    Type: Application
    Filed: January 29, 2010
    Publication date: August 5, 2010
    Applicant: Hilti Aktiengesellschaft
    Inventors: Alexander JOHN, Reinhard Schulz, Eduard Pfeiffer
  • Patent number: 7762347
    Abstract: An improved impact power tool for carving and engraving an article comprises an air delivery system operable to communicate with a pressurized air source; a drive assembly operable to receive air from the pressurized air source via the air delivery system; a hand held device in driven communication with the drive assembly; and a housing for storage of the air delivery system and drive assembly. The tool includes an improved valve design, a throttle bias valve, and an air storage tank housed within the housing, and an improved housing construction. The improved valve design and air storage tank enable greater stroke speeds of a work tool over a wider power range while also improving the crispness and speed of the impact reaction time over the entire range. The throttle bias valve is in communication with an additional exhaust path, such that the bias valve allows improved control of the hand held device and improved operation over a wider range of air pressures.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: July 27, 2010
    Assignee: Glendo Corporation
    Inventors: Donald J. Glaser, Lon C. Tidwell
  • Patent number: 7762350
    Abstract: 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), where the impulse piston (10) is arranged for transfer of pressure peaks in the liquid volume (8) into impulses in the tool (12), whereby transfer of energy from a propulsion mechanism (14) into impulses in the tool (12) is effected by volume reduction of the propulsion chamber (6), whereby the impulse piston (10) is driven forward by a pressure peak in the propulsion chamber (6). The invention also relates to a hydraulic impulse tool comprising an impulse generator (2).
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: July 27, 2010
    Assignee: Atlas Copco Rock Drills AB
    Inventor: Sverker Hartwig
  • Publication number: 20100155096
    Abstract: 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.
    Type: Application
    Filed: January 31, 2008
    Publication date: June 24, 2010
    Inventor: Ward D. Morrison
  • Publication number: 20100084152
    Abstract: 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.
    Type: Application
    Filed: May 21, 2008
    Publication date: April 8, 2010
    Applicant: MONTABERT
    Inventor: Bernard Piras
  • Patent number: 7681658
    Abstract: A pneumatic impact tool includes a housing, an accumulation chamber, and a piston. The housing defines a longitudinal passageway with a rear end and a front end and a passageway gas port. The accumulation chamber has a accumulation chamber gas port connectable to a gas supply and a inner gas port in fluid communication with the longitudinal passageway. The piston is inserted in the longitudinal passageway and slides between a rest position wherein the piston is juxtaposed to the rear end of the longitudinal passageway and an impact position wherein the piston is juxtaposed to the front end of the longitudinal passageway. The piston moves from the rest position to the impact position when gas is inserted in the longitudinal passageway through the passageway gas port and is propelled therebetween by pressurized gas contained in the accumulation chamber.
    Type: Grant
    Filed: November 6, 2007
    Date of Patent: March 23, 2010
    Inventor: Maurice Duval
  • Publication number: 20090321100
    Abstract: A method for controlling a fluid operated percussive device, which inside an axially extending cylinder room (3) of a housing (2) of the percussive device includes a to and fro moveable percussive piston (1), which is adapted for performing strikes in a striking direction (A) and which includes a signal portion (4) for controlling a main valve (5), which is adapted to intermittently transmit pressure fluid to at least one driving chamber (7) for the percussive piston. An auxiliary valve (9) is controlled for transmitting fluid contact between at least one auxiliary channel means (13,14) with a channel opening in the cylinder room (3), and the main valve (5) over the signal portion (4), for switching the main valve (5) before the percussive piston, in operation, has reached at least one of said regions. The invention also concerns a percussive device and a rock drilling machine.
    Type: Application
    Filed: January 23, 2008
    Publication date: December 31, 2009
    Inventor: Kurt Andersson
  • Patent number: 7581599
    Abstract: A percussion device (1) with a reciprocating percussion piston (3), includes a first chamber (5) that can be pressurized for forward driving of the percussion piston (3) and a second chamber (8) that can be periodically pressurized for back-driving of the percussion piston (3). The percussion device includes at least one driving piston (7) arranged for actuating the back-driving of the percussion piston (3) wherein a portion of said driving piston (7) is arranged to enter into the second chamber (8) for pressure actuating on a driving surface of the driving piston by pressure medium being present in this chamber in the direction of back-driving, wherein the driving piston (7) includes means for back-driving co-operation with the percussion piston (3), and wherein the driving piston (7) is free for axial movement with respect to the percussion piston (3), opposite the direction of back-driving. The invention also concerns a method and a rock drilling machine.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: September 1, 2009
    Assignee: Atlas Copco Rock Drills AB
    Inventor: Kurt Andersson
  • Patent number: 7523791
    Abstract: An object of the invention is to provide an improved technique for lessening an impact force caused by rebound of a tool bit after its striking movement in an impact power tool. The representative impact power tool comprises a tool body, a hammer actuating member, a tool holder, a driving mechanism, a weight placed in contact with the hammer actuating member to move rearward by a reaction force transmitted from the hammer actuating member when the hammer actuating member performs a hammering operation on the workpiece and an elastic element elastically deformed when the weight moves rearward in the tool body to push the elastic element such that the elastic element absorbs the reaction force transmitted to the weight. The weight is defined one or both of the cylinder and the tool holder.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: April 28, 2009
    Assignee: Makita Corporation
    Inventor: Yonosuke Aoki
  • Publication number: 20090095498
    Abstract: A percussion device (1) with a reciprocating percussion piston (3), includes a first chamber (5) that can be pressurized for forward driving of the percussion piston (3) and a second chamber (8) that can be periodically pressurized for back-driving of the percussion piston (3). The percussion device includes at least one driving piston (7) arranged for actuating the back-driving of the percussion piston (3) wherein a portion of said driving piston (7) is arranged to enter into the second chamber (8) for pressure actuating on a driving surface of the driving piston by pressure medium being present in this chamber in the direction of back-driving, wherein the driving piston (7) includes means for back-driving co-operation with the percussion piston (3), and wherein the driving piston (7) is free for axial movement with respect to the percussion piston (3), opposite the direction of back-driving. The invention also concerns a method and a rock drilling machine.
    Type: Application
    Filed: June 14, 2006
    Publication date: April 16, 2009
    Inventor: Kurt Andersson
  • Patent number: 7484570
    Abstract: Percussion device including a machine housing (1), a forwards and backwards movable percussion piston (2) in the machine housing, and a reciprocatingly movable tubular valve body (6) inside the machine housing, said percussion piston (2) being arranged to subject a tool (3) to impact, and said percussion piston including a first (4) and a second (5) driving surface arranged to be pressurized in order to drive the percussion piston forwards and backwards, said valve body (6) including a first end surface (12) and a second end surface (13), wherein pressurizing the first end surface (12) tends to drive the valve body in a first direction and pressurizing the second end surface (13) tends to drive the valve body in a second direction, whereby the valve body (6) is arranged, over a channel (7) arranged in the machine housing, to connect at least the second (5) of the driving surfaces alternately to a pressure source (8) or to low pressure (9), wherein an inner room (31) in the tubular valve body (6) is continuous
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: February 3, 2009
    Assignee: Atlas Copco Rock Drills AB
    Inventors: Kurt Andersson, Jörgen Rodert
  • Patent number: 7481764
    Abstract: A device (1) which includes an elongate body (2) with a movable mass (3) arranged for sliding movement within the body (2), the element (4) being arranged to decelerate toward an end of the body (2) in order to impart forward movement thereto, via momentum transfer, and being arranged to accelerate away from said end in order to further drive the body (2) forward, again using momentum transfer.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: January 27, 2009
    Assignee: Endogene Pty Ltd.
    Inventors: Mikhail Soutorine, Nurbey Gulia, Igor Tchepikov
  • Publication number: 20080236855
    Abstract: An electric power tool, in particular an electric hammer, having a drive unit (11) contained in a housing (10), an impact mechanism (12), and a handle (13), including a cam (14) that is driven by the drive unit (11); the impact mechanism (12) has moving parts (15, 16). At least two of the moving parts (15, 16) are able to move inside a separate guide cylinder (17) that is stationary in relation to the moving parts (15, 16) and the cam (14).
    Type: Application
    Filed: March 17, 2006
    Publication date: October 2, 2008
    Inventors: Gerhard Meixner, Juergen Lennartz
  • Publication number: 20080230248
    Abstract: 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.
    Type: Application
    Filed: March 15, 2008
    Publication date: September 25, 2008
    Inventor: DONGMIN NIU
  • Publication number: 20080223244
    Abstract: The invention relates to a device and to a method for producing pressure waves of a high intensity. Thereby, a flowable, explosive substance, or flowable components which form an explosive mixture on mixing and are preferably gaseous, are introduced into a pressure-tight container and ignited. The gas pressure arising from the ignition is led away through a previously closed passage. Preferably, a closure is kept closed by way of a spring element until the explosion, wherein the spring element comprises a relief device.
    Type: Application
    Filed: August 31, 2006
    Publication date: September 18, 2008
    Applicant: EXPLO ENGINEERING GMBH
    Inventor: Hans Ruegg
  • Publication number: 20080190633
    Abstract: An hydraulic attachment (10) adapted to be mounted to machinery or a vehicle such as a skid-steer loader (35) and having a telescopic mast assembly (11) including a first lower mast member (12) and at least one second upper mast member (13) telescopically engaged with the lower mast member (12) and at least one hydraulic actuator (15) for extending or retracting the upper mast member (13) relative to the lower mast member (12). Mounting means (34) are provided for mounting the mast assembly (11) to the loader (35) so as to be supported in use in a substantially upstanding attitude and the mast assembly (12) includes support means (22) at its upper end for supporting or carrying a tool such as an impact applying tool (23).
    Type: Application
    Filed: February 28, 2006
    Publication date: August 14, 2008
    Inventors: Carey Michael Johnston, Glen William Lapham
  • Patent number: 7410010
    Abstract: 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 piston reciprocally guided in the cylinder bore for delivering blows to a working implement attached to the housing, a pressure accumulator pre-loaded to a certain pressure level, and a distribution valve for alternatingly connecting the rear working chamber to the supply passage and the drain passage to thereby reciprocate the hammer piston, wherein a sequence valve is provided in the drain passage to keep up the pressure in the rear working chamber so that the resulting forward directed force prevents the piston from being moved backwards in the cylinder bore at pressure levels in the supply passage below the pre-load pressure level of the accumulator.
    Type: Grant
    Filed: August 24, 2005
    Date of Patent: August 12, 2008
    Assignee: Atlas Copco Construction Tools AB
    Inventors: Roland Stig Henriksson, Anders Wilhelm Lundgren
  • Patent number: 7392855
    Abstract: 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 member. The hydraulic system is operatively connected to the piston drive assembly to apply a drive force to the piston member. The vibration drive assembly generates a vibratory force. The vibration drive assembly is operatively connected to the piston drive assembly. The drive system operates in a first mode in which the drive force and the vibratory force are applied to the piston member along a drive axis.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: July 1, 2008
    Assignee: American Piledriving Equipment, Inc.
    Inventor: John L. White