Independent Control Of Bypass Between Opposed Working Chambers Patents (Class 91/437)
  • Patent number: 10422110
    Abstract: A pressure compensation unit includes: a control valve controlling hydraulic fluid supply and discharge to and from an actuator, the control valve including a pump port, a pair of relay and supply/discharge ports, and a tank port; a pressure compensation valve connected to the relay ports by an upstream and downstream-side relay lines, the pressure compensation valve moving in accordance with a pressure difference between upstream-side relay line and signal pressure; a load pressure detection line branching from the downstream-side relay line; a relief line connected to the downstream-side relay line and having a relief valve; and a switching valve leading: a maximum load pressure to the pressure compensation valve as the signal pressure when the hydraulic fluid does not flow through the relief line; and a pump pressure to the pressure compensation valve as the signal pressure when the hydraulic fluid flows through the relief line.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: September 24, 2019
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Yasunori Hatanaka, Masahiro Matsuo
  • Patent number: 10392878
    Abstract: A control system for actuating a drill pipe rack is provided. The drill pipe rack moves between a first position and a second position. The control system includes a first actuator to actuate a top end of the drill pipe rack and a second actuator to actuate a bottom end of the drill pipe rack. The control system includes a pump to supply pressurized fluid to the first actuator and the second actuator. The control system further includes at least one volumetric flow divider in fluid communication with the pump. The volumetric flow divider is configured to supply equal volumetric quantity of the pressurized fluid to the first actuator and the second actuator, and subsequently move the drill pipe rack between the first position and the second position.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: August 27, 2019
    Assignee: Caterpillar Global Mining Equipment LLC
    Inventors: Charles Taylor Hudson, Christopher J Demick, Yuvaraj Shanmugam
  • Patent number: 10119558
    Abstract: A control device, in particular for hydraulically controlling components of mobile working machines, has a pressure supply connection (P) and a tank or return connection (T) in addition to two user connections (A, B). Control and/or regulating valves (10, 14, 16, 18) are connected between the individual connections (P, T, A, B). Two control lines (C, Z) can control at least one of the control and/or regulating valves. A modular-type functional block (24, 26) is connected to at least one of the control lines (C, Z).
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: November 6, 2018
    Assignee: HYDAC FILTERTECHNIK GMBH
    Inventors: Sascha Alexander Biwersi, Marcus Hettiger, Marcus Simon Specks, Christoph Stoenner, Marcus Karl Pfeiffer, Erik Lautner
  • Patent number: 10053215
    Abstract: An electro-hydraulic on-blade actuation system includes a pair of linear motors, a pair of flexible bladders and a pair of hydraulic units. Each linear motor outputs linear force in response to input. The pair of flexible bladders attach to opposite sides of a rotorcraft blade. Each hydraulic unit connects a linear motor to a flexible bladder to hydraulically transmit the linear force of the linear motor to the flexible bladder to actuate the rotorcraft blade.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: August 21, 2018
    Assignee: BELL HELICOPTER TEXTRON INC.
    Inventor: Troy Schank
  • Patent number: 9651064
    Abstract: The present disclosure relates to a boom cylinder control circuit for a construction machine, and includes: a boom cylinder which has an ascending-side chamber and a descending-side chamber; a boom control unit which provides a working fluid to the boom cylinder; a boom operation part which is operated to drive the boom cylinder by providing a pilot working fluid to the boom control unit; a first floating valve which allows the descending-side chamber and the ascending-side chamber to selectively communicate with or be shut off from a first drain line; a second floating valve which is additionally provided in a flow path between the descending-side chamber, which is connected with the first drain line via the first floating valve, and the first drain line, allows the descending-side chamber to communicate with the first drain line, or shut off discharge of the working fluid from the descending-side chamber to the first drain line, and allows of a reverse flow; and a floating selection operation part which pro
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: May 16, 2017
    Assignee: Doosan Infracore Co., Ltd.
    Inventor: Won Sun Sohn
  • Patent number: 8997626
    Abstract: A manual release valve is provided for a electro-hydraulic actuator of the type including a piston movable in a cylinder and defining a piston side chamber and a rod side chamber, the valve threadedly attached to the housing of the actuator and extending at least partially within the fluid housing conduits, the valve moveable from a closed position fully seated in the housing to an open position for fluidly connecting both the piston side chamber and the rod side chamber to the reservoir, the valve further including a pressure relief portion that is operable when the valve is in the closed position for relieving pressure from at least one of the piston side chamber or the rod side chamber.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: April 7, 2015
    Assignee: Parker-Hannifin Corporation
    Inventor: David J. Anderson
  • Patent number: 8960228
    Abstract: A control valve comprises a first spool 22, a second spool 24 encircling at least part of the first spool 22 and angularly moveable relative thereto, and a sleeve 32 encircling at least part of the second spool 24, the second spool 24 being angularly moveable relative to the sleeve 32, the first and second spools 22, 24 having first and second series of ports 28, 30 registrable with one another, depending upon the relative angular positions of the first and second spools 22, 24, to control communication between at least a pressure line 16, a return line 18 and a control line 50 provided in or connected to the sleeve 32, the second spool 24 and the sleeve 32 having third and fourth series of ports 66, 68, axially spaced from the first and second series of ports 28, 30 and registrable with one another, depending upon the relative angular positions of the second spool 24 and the sleeve 32, to control communication between at least the control line 50 and the return line 18, and latch means 56 operable to resist
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: February 24, 2015
    Assignee: Goodrich Actuation Systems SAS
    Inventors: Arnauld Roger Edmond Hervieux, Laurent Patrice Donadille
  • Patent number: 8857168
    Abstract: A hydraulic system includes an actuator, a pump, rod side and cap side fluid connections between the pump and the rod and cap side chambers, respectively, at least one selectively actuatable regeneration valve that selectively provides flow from the cap side fluid connection to the rod side fluid connection, and a controller. The controller controls the pump to selectively vary the flow rate of the pump in response to a commanded motion to control movement of the piston. The controller actuates the regeneration valve during a retraction of the piston into the cylinder when pump is acting as a motor.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: October 14, 2014
    Assignee: Caterpillar Inc.
    Inventor: Patrick Opdenbosch
  • Publication number: 20140290475
    Abstract: A hydraulic actuation unit for controlling the starting and stopping of hydraulic motors includes a first main circuit and a second main circuit, a first recirculation circuit and a second recirculation circuit, a counterbalancing valve, which includes a shuttle, and a first discharge channel and a second discharge channel. The shuttle includes a first check valve and a second check valve. The first check valve includes at least one first flow control element that can move from an open position to a closure position. The second check valve includes at least one second flow control element that can move from an open position to a closure position. The first and second check valves respectively are provided with first damping means and second damping means in order to slow down the passage movement respectively of the first flow control element and of the second flow control element.
    Type: Application
    Filed: November 8, 2012
    Publication date: October 2, 2014
    Applicant: POCLAIN HYDRAULICS INDUSTRIALE S.R.L.
    Inventors: Enrico Rigolon, Enzo Corradini
  • Patent number: 8807013
    Abstract: Disclosed is a boom cylinder control circuit for a construction machine including a boom cylinder having an ascending-side chamber and a descending-side chamber. The boom cylinder control circuit includes: a first floating chamber with first and second input ports connected to the descending-side chamber and the ascending-side chamber, respectively, at one side, and first and second output ports connected with the drain tank, at the other side, and is switched to selectively connect the first and second input ports to the first and second output ports in accordance with an operational signal of the floating selection operation part; and a second floating valve of which one side is connected to the first output port and the other side is connected to the drain tank to selectively connect the first output port with the drain tank in accordance with the operational signal.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: August 19, 2014
    Assignee: Doosan Infracore Co., Ltd.
    Inventor: Won Sun Sohn
  • Patent number: 8752372
    Abstract: An articulated dump truck is provided with an electro-hydraulic bin control system including a proportional control valve for the bin lift cylinders and including a solenoid-operated regenerative valve assembly mounted adjacent the lift cylinders and being actuated, during lifting the bin for dumping a load of material from the bin, to cause a regenerative flow to occur when the force required by the bin lift cylinders to continue lifting the bin falls to a predetermined force. The force required for tilting the bin is continuously calculated by an electronic control unit taking into account a sensed bin load, a sensed bin tip amount and a sensed side-to-side inclination of the bin. In a simplified second embodiment, the proportional control valve controls the regenerative flow.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: June 17, 2014
    Assignee: Deere & Company
    Inventors: Matthew J Ramler, Robb A. Jones
  • Patent number: 8739679
    Abstract: Apparatus and methods for eliminating back drive in a push pull type control system, are provided. An exemplary apparatus includes a control rod including a pair of spaced apart piston displacement members each configured to carry a check valve. The apparatus also includes a pair of opposite-face check valves each configured to seal against respective opposing face of a piston head to form a hydraulic lock, preventing back drive in the control system.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: June 3, 2014
    Assignee: Carter Aviation Technologies, LLC
    Inventors: Jay W. Carter, Jr., M. Keith Robinson, Jeffrey R. Lewis
  • Patent number: 8666582
    Abstract: A vehicle steering feel improving apparatus is provided for a vehicle, wherein the vehicle is capable of running with a road wheel driven by a driving force from a power source. The vehicle steering feel improving apparatus includes a steering operation detecting means that detects a condition that steering operation is being performed to steer a steerable wheel of the vehicle. A driving force fluctuating means repeatedly fluctuates the driving force to the road wheel, while the steering operation detecting means is detecting the condition that steering operation is being performed.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: March 4, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yusuke Kageyama, Kazuhito Kato
  • Patent number: 8544378
    Abstract: A hydraulic system for construction equipment having a float function is provided. The hydraulic system can perform ground leveling as making a boom descend due to its own weight without using hydraulic fluid that is discharged from a hydraulic pump. The hydraulic system includes a holding logic poppet mounted in the float valve to prevent an abrupt descending of the boom due to leakage of the hydraulic fluid through a flow path between the main control valve and the float valve during the operation of the boom cylinders.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: October 1, 2013
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Jin Wook Kim
  • Patent number: 8539762
    Abstract: A hydraulic control circuit includes a hydraulic cylinder, a control valve, a recovery oil passage, a hydraulic pump, an engine rotation speed setting unit, a recovery control valve, and a controller that reduces an engine rotation speed to not more than a preset reduction control engine rotation speed when the load is lowered; and adjusts an increase or decrease in an opening amount of the recovery control valve in accordance with a level of the target rotation speed set by the engine rotation speed setting unit.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: September 24, 2013
    Assignee: Caterpillar Japan Ltd.
    Inventors: Yoshiyuki Shimada, Hiroyasu Nishikawa, Masaru Mishima, Yutaka Yokoyama
  • Patent number: 8464758
    Abstract: The invention relates to a valve arrangement with a continuously variable directional control valve, wherein the valve slide thereof can be adjusted in the direction of five positions in order to control a user in two directions, to carry out a quick motion, to switch into a floating position or to close off the pressure means connection to the user (neutral position).
    Type: Grant
    Filed: November 8, 2008
    Date of Patent: June 18, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Alfred Breunig, Josef Hessdoerfer, Walter Kirsch
  • Patent number: 8408352
    Abstract: An electronic control unit monitors pressure conditions present at the input to the steering system and other vehicle data signals and then provides override control of a hydro-mechanical flow control device. An electro-hydraulic valve is connected to the supply side of the hydro-mechanical flow control device and reacts to the electronic monitoring of pressure and other vehicle data to alter the counter-balancing forces within the hydro-mechanical flow control device. This causes a by-pass diversion of steering fluid to the source by the hydro-mechanical flow control device and thereby relieves backpressure on the pump when relatively little steering assist is required to be provided by the steering system. The control of steering fluid diversion at such times results in a significant reduction in parasitic losses within the steering system and improves the operating and fuel efficiency of the vehicle.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: April 2, 2013
    Assignee: Ford Global Technologies, LLC
    Inventors: Frederick R. Kasten, Darrel A. Recker, Daniel K. Tuttle, Ashraf Zeid
  • Patent number: 8225706
    Abstract: A method is provided for controlling a hydraulic cylinder, including detecting at least one operating parameter, and variably controlling a communication path between the piston-rod side and piston side of the hydraulic cylinder on the basis of the detected operating parameter.
    Type: Grant
    Filed: January 16, 2007
    Date of Patent: July 24, 2012
    Assignee: Volvo Construction Equipment AB
    Inventors: Bo Vigholm, Markku Palo
  • Publication number: 20120163949
    Abstract: A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device.
    Type: Application
    Filed: September 1, 2010
    Publication date: June 28, 2012
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kensuke Sato, Naoki Hagiwara
  • Patent number: 8146356
    Abstract: The procedure, provides a simple and retro-fittable manner to align working equipment, mounted to a liftable and lowerable hoisting frame of a working machine in a tilting way to comply with required positions, wherein the working equipment is shifted via a tilting cylinder in other directions than the hoisting framing. The tilting cylinder is supplied with hydraulic oil from a hydraulic pump for the working hydraulic system by a direct-operated control valve, and secondary consumers of the working machine being supplied with hydraulic oil from at least one other hydraulic pump. Once the driver operates a triggering element, the two hydraulic connections of the tilting cylinder are also connected to the hydraulic pump for the secondary consumers by a switch-over valve activated by the control equipment, therefore shifting the tilting cylinder in the direction of the neutral position of the working equipment.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: April 3, 2012
    Assignee: CNH Baumaschinen GmbH
    Inventors: Gustav Leidinger, Jörg Hermanns
  • Publication number: 20120042644
    Abstract: The invention relates to a mobile hydraulic system for a hybrid vehicle, comprising a hydraulic accumulator device (22), which comprises a high-pressure accumulator chamber (34) and a low-pressure accumulator chamber (35), between which a hydraulic drive unit is connected, wherein the hydraulic drive unit is used to convey an incompressible fluid from the low-pressure accumulator chamber (35) into the high-pressure accumulator chamber (34) in an accumulator operating state, wherein the incompressible fluid can be discharged from the high-pressure accumulator chamber into the low-pressure accumulator chamber (35) in a drive operating state in order to hydraulically drive the hydraulic drive unit.
    Type: Application
    Filed: January 25, 2010
    Publication date: February 23, 2012
    Applicant: ROBERT BOSCH GMBH
    Inventor: Bjoern Noack
  • Patent number: 8028613
    Abstract: A valve system includes a load holding valve, a feed balancing valve, and a fast feed differential valve. The load holding valve may be in fluid communication with the load holding valve. The fast feed differential valve is configured to move between an engaged state and a disengaged state. In the engaged state the fast feed differential valve fluidly couples a ring side of a feed cylinder, the load holding valve, and a piston side of the feed cylinder to allow fluid to flow from the ring side to the piston side.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: October 4, 2011
    Assignee: Longyear TM, Inc.
    Inventors: Stefan Wrede, Christof Kruse
  • Patent number: 8001882
    Abstract: A double check valve having a floating function is disclosed, which can prevent construction equipment from overturning through intercepting of a floating function even if a signal pressure is fed to the double check valve to perform the floating function in a state that an excavator is supported by a working device (e.g. a dozer blade), i.e. in a jack-up state, on a sloping site and so on.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: August 23, 2011
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Tae In Hyang
  • Publication number: 20100224060
    Abstract: Actuator controller comprising a body (12) with an inlet port (14) coupled to a source of pressurised fluid and in flow communication with primary and secondary spool bores (16, 20); primary and secondary spools (60, 62); first and second cross flow ports (48, 52) communicating said primary and secondary spool bores, compression and expansion outlet ports (53, 54) for applying pressurized fluid to a return-biased actuator (110); and a venting outlet port (23); wherein return action of the working piston of the actuator is facilitated with aid of pressurized fluid already gained in the system.
    Type: Application
    Filed: October 30, 2006
    Publication date: September 9, 2010
    Inventors: Amir Nemenoff, Efraim Maayan, Yoel Hadar
  • Publication number: 20100206160
    Abstract: A fluid control system for use with a patient support apparatus is moveable from a first height to a second height. The system includes a lift arm and a substantially upright cylinder. A first end of the lift arm is pivotably coupled to a base member and a second end of the lift arm is coupled to a chair structure. The cylinder assembly has a base portion and an extendable member configured to contact and support the lift arm. The cylinder assembly includes a bypass valve having a first end in fluid contact with an upper reservoir and a second end in fluid contact with a lower reservoir.
    Type: Application
    Filed: February 13, 2009
    Publication date: August 19, 2010
    Inventor: Henry Warn Jackson
  • Patent number: 7721640
    Abstract: A cable operated gas cylinder comprises: a base tube; a spindle which is inserted at hollow part in said base tube; a cylinder which is mounted within said spindle; a piston dividing the gas-filled space within said cylinder into upper part and lower part; a pipe holder sealing airtight the upper part of said cylinder; a gas opening/closing pin which is mounted penetratingly through central part of said pipe holder and for controlling getting in and out of the gas filled within said cylinder; a release arm for controlling the opening/closing of said gas opening/closing pin; a cable for controlling turning of said release arm when being pulled by external force; and a taper holder which receives said release arm therein and rotationally intervenes within said spindle, wherein said release arm and said taper holder are capable of rotating together as said cable rotates.
    Type: Grant
    Filed: June 21, 2007
    Date of Patent: May 25, 2010
    Assignee: Samhongsa Co., Ltd.
    Inventor: Ho Min Lee
  • Patent number: 7637201
    Abstract: An adjustable length cylinder assembly includes a housing and a piston reciprocably mounted within the housing for movement between an extended position and a retracted position. The piston defines first and second hydraulic fluid chambers of differing cross-sectional area on opposite sides of the piston. An accumulator is housed within one of the housing and the piston. Channels communicate hydraulic fluid the first and second chambers and the accumulator during the movement of the piston. A valve member is concentric with the piston and accumulator and rotatable between a first rotary position in which the channels are open so that fluid can be transferred between the chambers to allow retracting and extending movement of the piston and a second rotary position in which the channels are closed so that fluid cannot be transferred and the piston is locked against retracting and extending movement.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: December 29, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventor: Yhu-Tin Lin
  • Patent number: 7543449
    Abstract: The invention concerns a hydraulic system for linear drives with a differential cylinder, in particular for mobile machines which through the use of displacement-control of the drives avoids the many and diverse disadvantages of the state of the art and renders possible a precise and energy-efficient control of linear drives with differential cylinders, and which is economical and simple to maintain and which can be well integrated into the total hydraulic system of such machines.
    Type: Grant
    Filed: January 14, 2004
    Date of Patent: June 9, 2009
    Assignee: CNH America LLC
    Inventors: Monika Ivantysynova, Robert Rahmfeld, Erik Lautner, Jurgen Weber
  • Patent number: 7487707
    Abstract: A hydraulic circuit controls flow of fluid between first and second ports of a hydraulic actuator, such as a cylinder/piston arrangement and each of a supply conduit and a tank return conduit. The hydraulic circuit operates in standard powered operating modes as well as powered and unpowered regeneration modes. In a powered operating mode, a conventional pressure compensated spool valve determines the velocity of the hydraulic actuator. A workport blocking valve connects one workport of the spool valve to the first port and the other workport is connected to the second port. A regeneration shunt valve is directly connected between the first and second ports of the hydraulic actuator. In a regeneration operating mode or a mix of powered and regeneration modes, a combination of the spool valve, the workport blocking valve, and the regeneration shunt valve determines the velocity of the hydraulic actuator.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: February 10, 2009
    Assignee: Husco International, Inc.
    Inventors: Joseph L. Pfaff, Dwight B. Stephenson
  • Patent number: 7430953
    Abstract: A loading implement and method of operating a loading implement for the adjustment of a floating condition of a boom of the loading implement. The loading implement includes a hydraulic arrangement for the lifting and lowering of the boom, a hydraulic conveying device, a hydraulic fluid tank, a hydraulic cylinder, a control implement connected to hydraulic supply lines for the control of the hydraulic cylinder, a first and a second hydraulic line connecting the hydraulic cylinder with the fluid tank and equipped with a first and a second selector valve, a lifting side load holding valve and a control unit for switching of the selector valves. In order to permit the activation of a floating condition without the boom being lowered uncontrollably, a sensor signals the position of the boom or the hydraulic cylinder to the control unit, which is configured to cause lowering of the boom and/or the switching into the floating condition as a function of the signal delivered by the sensor.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: October 7, 2008
    Assignee: Deere & Company
    Inventor: Marcus Bitter
  • Patent number: 7347117
    Abstract: A hydraulic linear drive for a hydraulic vehicle transmission actuator has a piston/cylinder unit in which an adjusting piston is arranged so it is longitudinally displaceable in a cylinder housing and subdivides the cylinder space into at least two pressure spaces which can receive hydraulic oil through control lines. The optional pressure action on the two pressure spaces is controllable by a shift valve. A connecting line is provided between the two control lines leading to the pressure spaces and a control valve is provided for optionally releasing or blocking the connecting line to further control the pressure force acting on the piston.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: March 25, 2008
    Assignee: Dr. Ing. h.c.F. Porsche Aktiengesellschaft
    Inventor: Serge Nassif
  • Patent number: 7249608
    Abstract: The flow control device comprises a supply passage (2) for supplying hydraulic fluid discharged by a pump (1) to a power steering output section (8); a variable throttle section (3) situated at an intermediate position of the supply passage (2); and a flow control valve (4) for returning the hydraulic fluid in the supply passage (2) to the pump inlet side, in accordance with a pressure differential between upstream and downstream of the variable throttle section (3). When the pump (1) is halted, the flow control valve (4) is impelled by a spring (13) and closes the variable throttle section (3). A throttle passage (51) is provided for connecting the upstream side and the downstream side of the variable throttle section with the supply passage (2).
    Type: Grant
    Filed: October 7, 2004
    Date of Patent: July 31, 2007
    Assignee: Kayaba Industry Co., Ltd
    Inventors: Tetsuji Hayashi, Tsunefumi Arita, Hideyasu Ihira
  • Patent number: 7237472
    Abstract: The invention provides a choke system with hydraulic circuits which provide choke valve positioning that can be varied by the use of incremental steps. The incremental movement action in either the opening or closing direction is accomplished through the use of one of the two hydraulic slave cylinders which can either add or subtract a fixed volume of hydraulic fluid from the choke actuator. A series of check valves provides direction for flow in the hydraulic lines, locking of the choke actuator, and re-filling of the slave cylinders during operation. The system eliminates excessive lines or solenoid valves and avoids the need for mechanical locking mechanisms. Preferred embodiments include a “fast close” system which, instead of running through a series of steps to close the valve, provides valve control in a fast close line to move the choke actuator to the full closed position from anywhere in the travel over a shorter period of time than through normal stepping operation.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: July 3, 2007
    Assignee: Master Flo Valve, Inc.
    Inventor: Harry Richard Cove
  • Patent number: 7231866
    Abstract: The cable type opening and closing switch structure for a valve pin control of a gas cylinder is disclosed.
    Type: Grant
    Filed: April 5, 2005
    Date of Patent: June 19, 2007
    Assignee: Korea Gas Spring Co., Ltd.
    Inventor: Baek-Hyung Seong
  • Patent number: 7219592
    Abstract: The invention concerns a valve arrangement for controlling a hydraulic drive, the supply to and the outflow from the hydraulic drive being separately controllable. It is endeavoured to realise separate controls of the speed and the hydraulic pressure of the hydraulic drive. For this purpose, a pump pipe is connected with a first control valve, the first control valve is connected through a pipe with a first working connection and a second working connection of the hydraulic drive, and the first working connection is connected with a second control valve and the second working connection is connected with a third control valve, the second control valve and the third control valve opening into a tank (T).
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: May 22, 2007
    Assignee: Sauer-Danfoss ApS
    Inventors: Brian Nielsen, Poul Erik Hansen, Torben Ole Andersen
  • Patent number: 7210395
    Abstract: The invention relates to a system for handling an implement on a vehicle which comprises a frame. The system comprises a lifting apparatus arranged between the frame and the implement for raising and lowering the implement in relation to the frame, a pump (11) coupled to the lifting apparatus for supplying this with a fluid in order to produce said movements, and an operating valve (10) arranged between the pump and the lifting apparatus for controlling the flow of said fluid to the of said fluid to and from the lifting apparatus. The system further comprises a control device (9) which is designed to disconnect the control of the lifting apparatus via said fluid. The control device is coupled in such a way to an operating element 814) arranged in the vehicle cab (13) that control of the control device via the operating element is permitted independently of the control of the operating valve.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: May 1, 2007
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventors: Lennart Strandberg, Bo Vigholm, Johan Lillemets
  • Patent number: 7174988
    Abstract: A power steering system includes a reversible-type oil pump supplying hydraulic fluid to first and second pressure chambers of a hydraulic power cylinder through first and second passages and having first and second discharge ports, and a branch passage conveying part of hydraulic fluid discharged from the discharge ports of the oil pump to the outside of the pressure chambers of the power cylinder, wherein the branch passage has a passage sectional area greater than a total leak sectional area of the oil pump.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: February 13, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Mitsuo Sasaki, Yuji Torizawa
  • Patent number: 7134379
    Abstract: Disclosed is a gas cylinder, for improving sealing characteristics of the gas cylinder and improving convenience in manufacturing, including: a valve having a gas opening/closing pin at a through hole in its center, for intermittently passing a gas, and additionally having a valve dividing body seated on a groove approximately in a lower part of the through hole; a spindle to an upper inside of which the valve is inserted; and a piston inserted to an inside of an open cylinder of the spindle, and having, a step threshold formed at a predetermined distance from an upper end, to which an O-ring for maintaining sealing is fit, and having another step threshold ranging from a lower side of the step threshold to a lower end on an inner lateral surface of the piston, to which an O-ring is fit.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: November 14, 2006
    Inventors: Young Sang Jeon, Dong Kwan Ma, Ki Cheol Lee
  • Patent number: 7104181
    Abstract: A hydraulic control circuit for a hydraulic cylinder is described for the raising and lowering of a boom on a telescopic loader. First and second chambers of the hydraulic cylinder are connected to a control valve over first and second supply lines and are selectively connected to either a hydraulic pressure source or to a hydraulic reservoir. The circuit includes on-off valves for controlling the flow through a first hydraulic line extending between the first chamber of the cylinder and the hydraulic reservoir, and through a second hydraulic line extending between the second chamber and the hydraulic reservoir in such a way that a floating position can be provided. Furthermore, a load-holding valve arrangement is provided in the first supply line at a location between the control valve and the first chamber of the cylinder.
    Type: Grant
    Filed: February 18, 2004
    Date of Patent: September 12, 2006
    Assignee: Deere & Company
    Inventors: Marcus Bitter, David Price, Steffen Schlemmer, Marlin Onnen
  • Patent number: 7096773
    Abstract: A telescopic pneumatic device comprises an outer cylinder, an inner cylinder disposed in the outer cylinder and having a cylinder wall defining an air chamber, a piston mounted in the air chamber and having a piston rod connected thereto, a flow passage provided between the cylinder wall and the outer cylinder, and a control valve operable to permit or interrupt fluid communication between the flow passage and the air chamber. The inner cylinder is made of a rigid plastic material and includes a valve mounting part for receiving the control valve, the valve mounting part being formed in one piece with the cylinder wall.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: August 29, 2006
    Assignee: Fu Luong Hi-Tech Co., Ltd.
    Inventor: Yu-Jen Wang
  • Patent number: 7036422
    Abstract: The invention relates to a continuously lockable adjusting device 1, consisting of a fluid-filled cylindrical housing 2, of a piston 4 which is axially movable in the housing 2 and which subdivides the housing 2 into two pressure chambers 5, 6 and is connected to a piston rod 3 which, sealed off at one end, penetrates the housing 2. A locking valve 7 has a closing member 13 and a manually actuable trigger tappet 8 together with a transmission disc 16, a tilting movement of the trigger tappet 8 causing the closing member 13 to be capable of being acted upon axially movably by the transmission disc 16 and causing the locking valve 7 to be capable of opening so as to connect the pressure chambers 5, 6 to one another. The transmission disc 16 of the trigger tappet 8 is in bearing contact on the closing member 13 axially in a play-free manner, and the trigger tappet 8 is fixed axially in this position with respect to the closing member 13.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: May 2, 2006
    Assignee: Stabilus GmbH
    Inventor: Harald Pooschen
  • Patent number: 7007587
    Abstract: A control for a fluid cylinder includes a cylindrical housing made of a polymeric material which pivotally receives a control arm having a cable release receiving member at one end and which can be snap-fitted within an open end of a pneumatic cylinder to lockably engage a valve spacer manufactured as part of the cylinder. With such a system, the control can be installed in the cylinder and rotated to position the cable release in any orientation within a 360° adjustment range to allow proper alignment of the cable release.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: March 7, 2006
    Assignee: Suspa Incorporated
    Inventor: James Vander Zanden
  • Patent number: 7003949
    Abstract: An integrated three function valve (ITFV) that combines the functions of a bypass valve (e.g. 183a, 185a, 161a) into a single assembly is disclosed. The ITFV allows continued operation after any two failures.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: February 28, 2006
    Assignee: Bell Helicopter Textron Inc.
    Inventors: Carlos A. Fenny, David P. Schultz, Ian L. Price, David A. Curd
  • Patent number: 6990888
    Abstract: A mechanism is provided for use with a hydraulic control mechanism of a hydraulic tool. The hydraulic control mechanism is attached to the hydraulic tool to provide a desired hydraulically powered function. The mechanism allows the hydraulic control mechanism to be used with either a constant volume hydraulic system or a constant pressure hydraulic system. The mechanism provides a valve chamber and a valve member positioned within the valve chamber. The valve chamber communicates with both a central passageway and a cross passageway of the hydraulic control mechanism. The valve chamber defines a valve seat proximate to one of the central and cross passageways. The valve member is displaceable within the valve chamber and is configured such that, depending on the position of the valve member within the valve chamber, the hydraulic control mechanism can be used with either a constant volume hydraulic system or a constant pressure hydraulic system.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: January 31, 2006
    Assignee: Greenlee Textron Inc.
    Inventors: Julie Harwath, Orville Diekmann
  • Patent number: 6955115
    Abstract: A fluid system is provided wherein two different fluid circuits are connected in parallel with a single source of pressurized fluid and the two fluid circuits can function together even when one of the loads is lighter than the other. This is accomplished by having the lightly loaded circuit having a directional control that when operated in one of its operative positions the flow from the rod end of the cylinder is directed through the directional control valve and combined with the supply flow being directed to the head end of the cylinder. With the other heavier loaded circuit also being actuated, the pressure of the fluid from the rod end of the fluid cylinder is equalized with the pressure of the heavier loaded circuit. Consequently, the speed of the heavier loaded circuit does not stall or slow down relative to the lightly loaded circuit.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: October 18, 2005
    Assignee: Caterpillar Inc.
    Inventors: Michael A. A'Hearn, Thomas J. Hajek, Sr., Larry W. Lorimor, Daniel T. Mather, Srikrishnan T. Tolappa
  • Patent number: 6886450
    Abstract: A piston/cylinder unit having a selectively inhibited movement includes a cylinder filled with a hydraulic medium and a piston arranged on a piston rod and dividing the cylinder into working spaces. A flow connection system having a flow connection is arranged between the first and second working spaces. The flow connection system includes an on-off valve having a movable valve element which opens the flow connection as a function of a position of the movable valve element. The flow connection system further includes a load-dependent valve arranged in series with the on-off valve for inhibiting complete flow through the flow connection independently from the on-off valve when a load on the piston/cylinder unit is lower than an inhibiting load.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: May 3, 2005
    Assignee: Stabilus GmbH
    Inventor: Axel Knopp
  • Patent number: 6877417
    Abstract: To perform boom-down operation by operating a boom cylinder (6) by an external load (W) while simultaneously operating an arm cylinder (26) or a bucket cylinder (27) in the state the bucket is off the ground, a first boom directional control valve (2) and a regeneration boom valve (13) are controlled to the neutral position and the open position respectively so that the hydraulic oil is regenerated from a line (9) located at the oil-returning side of the boom cylinder (6) through the regeneration boom valve (13) to a line (5) located at the oil-feeding side. Therefore, the volume of the hydraulic oil that can be supplied from the pressurized oil source (4) to the arm cylinder (26) or the bucket cylinder (27) via the second arm directional control valve (24) or the bucket directional control valve (25) is increased by the amount equivalent to the amount of the oil that is not supplied from the pressurized oil source (4) to the boom cylinder (6).
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: April 12, 2005
    Assignee: Shin Caterpillar Mitsubishi Ltd.
    Inventor: Yoshiyuki Shimada
  • Publication number: 20040255772
    Abstract: The invention relates to a device for adjusting the pressure in the chambers of a hydraulic jack comprising a hollow valve seat extending substantially longitudinally between two end sections, the body of the valve seat being connected to a source of pressurised fluid, each of the end sections of the valve seat being linked to a chamber of the hydraulic jack and adapted to receive a valve allowing to control the refilling with hydraulic fluid of said chamber of the jack, characterised in that a valve return spring is placed inside said valve seat and in that each of the ends of said valve return spring is attached to one of said valves.
    Type: Application
    Filed: April 7, 2004
    Publication date: December 23, 2004
    Inventor: Alain Roy
  • Patent number: 6739129
    Abstract: An electromotor M of a electrohydraulic motor pump aggregate G drives at least one pump stage P, P1, P3. An attached element C is inserted between at least one pressure side port of the pump stage, a return line 13, and at least one consumer port A, B, 5, 6. A multiways control valve 3 is installed between the consumer port and the pressure side port. A pressure limiting valve R1, R2 constructed as a seated valve is installed between the consumer port A, B, 5, 6 and the return line 13. The motor pump aggregate G has an automatic hydraulic pressure relieving device D for relieving the system pressure whenever the electromotor M is switched off.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: May 25, 2004
    Assignee: Heilmeier & Weinlein Fabrik F. Oel-Hydraulik GmbH & Co. KG
    Inventors: Martin Heusser, Gerhard Lörner
  • Patent number: 6705201
    Abstract: A piston/cylinder unit, in particular a gas spring, includes a valve device for the operational motion of a piston rod. The valve device is activatable by an activation device, the activation device being connected near an actuation device and being connected to a load contact device, which influences the function of the valve device. The load contact device connects the actuation device to the valve device for the purpose of changing the adjustability of the valve device when the gas spring is loaded.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: March 16, 2004
    Assignee: Stabilus GmbH
    Inventors: Axel Knopp, Stephan Enders, Manfred Metzdorf