Pump Means Moves Motive Fluid From One Chamber To An Opposite Chamber Of Opposed Expansible Chambers Having A Common Output Patents (Class 60/473)
  • Patent number: 11286961
    Abstract: The invention provides an actuator device, which has: an output element, which is acted on by a fluid and as a result is movable into a holding position; two solid-state actuators, which are able to be activated alternately; a coupling element common to the solid-state actuators; a discharge duct, via which the fluid is able to be discharged from the output element; and at least one valve element, which is adjustable between a blocking closed state and an open state, in which the valve element allows the fluid to be discharged from the output element via the discharge duct and allows the output element to move from the holding position into at least one yielding position, wherein the valve element is actuable, via the coupling element of the respective solid-state actuator, by the respective activation of the solid-state actuator and is able to be moved into the closed state.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: March 29, 2022
    Assignee: MetisMotion GmbH
    Inventors: Georg Bachmaier, Patrick Fröse, Matthias Gerlich, Wolfgang Zöls
  • Patent number: 11007640
    Abstract: A rotary drive device has a fluid-actuated rotary drive, which has a drive housing and a drive unit rotatable relative thereto. The drive unit has a pivot piston and a drive shaft connected thereto, whereby the drive shaft projects from the drive housing on an axial front side with a drive section. On the rear side, several components are mounted in axial succession on the drive housing of the rotary drive, which together with the rotary drive form a uniformly practicable drive assembly. These components include a valve carrier device carrying a control valve arrangement, a pneumatic connection unit, and an electronic control unit electrically connected to the control valve arrangement. A robot arm is also proposed, which includes the rotary drive device as an arm joint.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: May 18, 2021
    Assignee: FESTO SE & CO. KG
    Inventors: Simon Markowski, Artem Beger
  • Patent number: 10480643
    Abstract: A hydraulic control system of an automatic transmission for a vehicle provided with an ISG system is disclosed. The hydraulic control system may include: a mechanical hydraulic pump driven by an engine; a linear solenoid valve to control hydraulic pressure generated by the mechanical hydraulic pump; a first switch valve to selectively supply or not to supply controlled hydraulic pressure to one of friction members; an electric hydraulic pump driven by electric energy; and a second switch valve to selectively supply the hydraulic pressure, generated by the electric hydraulic pump, to the one friction member or to the linear solenoid valve. The hydraulic control system supplies the hydraulic pressure to one of the friction members operated at a gear stage where starting control is performed.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: November 19, 2019
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventor: Jin Young Hwang
  • Patent number: 10113563
    Abstract: A hydraulic drive carries out a method for discretely changing a positional output on the hydraulic drive. At least one displacement cylinder incrementally supplies or discharges the cylinder volume to or from the drive by displacing the cylinder piston element from a starting to an end position depending on at least one input signal. The piston element is repeatedly displaced from starting to end position and back to discretely change the positional output correspondingly to the supplied or discharged displacement volume. The cylinder is hydraulically connected to a pressure medium source supply or return line while displacing the piston element from starting to end position. The changed positional output is restored in a successive step. The cylinder chambers of the displacement cylinder are hydraulically short-circuited by a short-circuit line hydraulically separated from the supply or return line when returning the piston element from the end to the starting position.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: October 30, 2018
    Assignee: Linz Center of Mechatronics GmbH
    Inventors: Rudolf Scheidl, Andreas Ploeckinger, Christoph Gradl
  • Patent number: 9926918
    Abstract: Energy-recuperating vibration damper having a cylinder in which a displacer executes a limited operating movement in a working chamber so that a pressurized fluid is supplied to a fluid motor which drives a generator. A compensation chamber compensates for a change in volume of the pressurized fluid. A pressure accumulator is provided in addition to the compensation chamber, which pressure accumulator communicates with and is parallel-connected to the fluid motor.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: March 27, 2018
    Assignee: ZF Friedrichshafen AG
    Inventors: Michael Triebel, Achim Thomae, Helmut Baalmann, Wilhelm-Heinrich Broocks, Oswald Lichtlein, Steffen Heyn, Andreas Förster, Joachim Gajek, Robert Pradel, Anke Sonnemann
  • Patent number: 9562547
    Abstract: There is set forth herein an actuator having a housing and a piston assembly. The piston assembly can have a piston and a piston rod extending from the piston. In one embodiment, the housing can receive the piston and a portion of the piston rod. The piston assembly can define a piston assembly interior and a fluid reservoir can be located within the piston assembly interior. A chamber region within the interior of the housing can be separated by the piston assembly to define a piston side chamber and rod side chamber. The piston assembly can be moveable so that respective volumes of each of the piston side chamber and the rod side chamber are variable. For operation of the actuator by movement of the piston assembly within the interior of the housing, fluid can be moved between the reservoir and the chamber region.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: February 7, 2017
    Assignee: ABB Schweiz AG
    Inventors: Harald Staab, Jeremy Newkirk, Thomas Fuhlbrigge
  • Patent number: 9124153
    Abstract: Disclosed is a direct drive generator for a wind turbine, the generator including a rotor, a stator configured to remain stationary relative to the rotor, and at least one bearing connected to the stator. The rotor includes at least one rotor part extending circumferentially about an axis of rotation and a plurality of active materials arranged on a side of the at least one rotor part. The stator includes at least one stator part extending circumferentially about the axis of rotation and positioned adjacent to the at least one rotor part, and at least one winding arrangement supported by the at least one stator part and facing the plurality of active materials. The bearing is flexibly connected to the at least one stator part, wherein the bearing abuts the rotor part to help maintain a gap between the at least one winding arrangement and the active materials.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: September 1, 2015
    Assignee: Vestas Wind Systems A/S
    Inventors: Frank Møller Hansen, Jonas Kristensen
  • Patent number: 8997473
    Abstract: An electro-hydraulic actuator (EHA) includes a hydraulic circuit having a plurality of pressure compensated flow control valves for limiting the maximum flow rate through the fluid conduits regardless of the loads imparted on the actuator. In one embodiment of the EHA, a plurality of combination manual override/thermal expansion valves that simplify the manufacture of the EHA.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: April 7, 2015
    Assignee: Parker Hannifin Corporation
    Inventors: Matthew Olson, James Prazak
  • Patent number: 8912455
    Abstract: A balance having at least one adjusting device (2, . . . ) having a drive, wherein the drive of the adjusting device is configured as a fluidic drive (4, . . . ), to which pressure can be applied by a pressure source disposed outside the scales via a pressure connection.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: December 16, 2014
    Assignee: Sartorius Lab Instruments GmbH & Co. KG
    Inventors: Michael Laubstein, Juergen Lauke
  • Publication number: 20130055706
    Abstract: In an automotive servo-assisted mechanical transmission, an electro-hydraulic actuation group has an actuation unit, a power unit able to provide hydraulic pressure to the actuation unit and an electronic control unit, the actuation and power units being equipped with respective components that are all mounted on a hydraulic casing of the actuation unit so as to define with one another a single assembly structurally separated from the electronic control unit, at least part of the components being equipped with respective electrical connectors that are arranged in a manner such that they can all be engaged by a same multiple electrical connector device.
    Type: Application
    Filed: April 21, 2011
    Publication date: March 7, 2013
    Applicant: C.R.F. SOCIETA CONSORTILE PER AZIONI
    Inventors: Marco Garabello, Andrea Piazza
  • Patent number: 8297924
    Abstract: An actuation system includes a pump assembly configured to form a pump chamber, an actuator having first and second chambers and a movable member and configured to convert pressures applied to the first and second chambers into a movement of the movable member, and a valve section. The valve section has a plurality of positions set by a controller, and the plurality of positions includes a first position in which the valve section opens the first flow path and closes the second flow path, a second position in which the valve section closes the first flow path and opens the second flow path, and a neutral position in which the valve section closes the first and second flow paths.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: October 30, 2012
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Shigeyuki Mori, Hiroshi Saito, Shuichi Nakayama, Kunimitsu Shimoyama
  • Publication number: 20120260643
    Abstract: A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator. The capacity of one of the machines is limited in a motoring mode to determine a maximum rate of efflux from one of the chambers. The pressure of fluid supplied to the other of said chambers is maintained at a predetermined level to provide motive force. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store surplus energy.
    Type: Application
    Filed: April 18, 2012
    Publication date: October 18, 2012
    Inventors: George Kadlicko, John Gregorio, Tobin Gimber, Jeffrey Maney
  • Publication number: 20110192157
    Abstract: A cylinder device (1) according to the present invention includes: a cylinder (2); a piston (3) slidably inserted into the cylinder (2); a rod (4) inserted into the cylinder (2) and connected to the piston (3); a rod-side chamber (5) and a piston-side chamber (6) partitioned by the piston (3) within the cylinder (2); a first on-off valve (9) provided in the middle of a first passage (8) allowing the rod-side chamber (5) to communicate with the piston-side chamber (6); a second on-off valve (11) provided in the middle of a second passage (10) allowing the piston-side chamber (6) to communicate with the tank (7); and a pump (12) for supplying liquid to the rod-side chamber (5).
    Type: Application
    Filed: September 9, 2009
    Publication date: August 11, 2011
    Inventor: Takayuki Ogawa
  • Patent number: 7966771
    Abstract: A door operator includes a housing, a first pressure compartment; a second pressure compartment, a drive unit disposed in the housing and coupleable to a door via an output shaft, the driving unit being associated with the first pressure compartment, a hydraulic pump in hydraulic connection with the first and second pressure compartments, a motor in driving relationship with the hydraulic pump, and a spring force accumulator disposed in the housing. The spring force accumulator is associated with the second pressure compartment and coupled to the drive unit.
    Type: Grant
    Filed: November 11, 2005
    Date of Patent: June 28, 2011
    Assignee: Dorma GmbH + Co. KG
    Inventor: Volker Bienek
  • Publication number: 20110146262
    Abstract: The invention relates to an electrohydraulic actuator comprising a body (1) that defines a cylindrical cavity (2) in which a piston (3) slides in leaktight manner and divides an inside volume of the cavity into two chambers (A, B) of variable volume, the piston being associated with at least one rod (4) passing in leaktight manner through an end wall of the cavity, the actuator including a bidirectional pump (5) having two ports (P1, P2), each connected to one of the chambers, an electric motor (8) for selectively driving the pump in one direction or the other, the pump being placed inside the piston of the actuator so as to move together therewith.
    Type: Application
    Filed: June 12, 2009
    Publication date: June 23, 2011
    Applicant: MESSIER-DOWTY SA
    Inventor: Robert Kyle Schmidt
  • Publication number: 20100180586
    Abstract: The hydraulic linear actuator system of the present invention includes a pump that is configured to rotate in a single direction at a substantially constant velocity. Both the direction and flow rate of fluid through the system is controlled by adjusting the positional relationship between the stator and the rotor of the pump. This positional relationship is adjustable between a forward flow state, a non-flow state and a reverse flow state. The hydraulic linear actuator is responsive to the flow of fluid through the system so as to be displaced in a first direction by the forward flow state of the pump and in a second direction by the reverse flow state of the pump.
    Type: Application
    Filed: July 2, 2008
    Publication date: July 22, 2010
    Applicant: ASHRADAN TECHNOLOGIES LTD.
    Inventors: Aviram Arbel, Alexander Cohen
  • Patent number: 7739940
    Abstract: In a directional control valve device, a first passage connects a second port with a first port by using a part of a movement path of a moving valve element when the moving valve element is in a position of a first end. A second passage connects the second port with the third port by using an internal passage of the moving valve element when the moving valve element is in a second end. The moving valve element is provided with a first check valve for permitting a flow in the internal passage only in the direction from the third port to the second port. When a fluid pressure is applied to the third port, the fluid pressure presses the moving valve element toward the second end so that the first passage is closed, and the first check valve is opened to open the second passage.
    Type: Grant
    Filed: August 21, 2007
    Date of Patent: June 22, 2010
    Assignee: Taiyo, Ltd.
    Inventor: Makoto Hiroshima
  • Patent number: 7640736
    Abstract: The hydraulic linear actuator system of the present invention includes a pump that is configured to rotate in a single direction at a substantially constant velocity. Both the direction and flow rate of fluid through the system is controlled by adjusting the positional relationship between the stator and the rotor of the pump. This positional relationship is adjustable between a forward flow state, a non-flow state and a reverse flow state. The hydraulic linear actuator is responsive to the flow of fluid through the system so as to be displaced in a first direction by the forward flow state of the pump and in a second direction by the reverse flow state of the pump.
    Type: Grant
    Filed: July 2, 2007
    Date of Patent: January 5, 2010
    Assignee: Ashradan Holdings Ltd.
    Inventors: Aviram Arbel, Alexandru Cohn
  • Publication number: 20090260354
    Abstract: An axle driving apparatus in which a hydraulic pump and a hydraulic motor which constitute a hydrostatic transmission are disposed on a center section. In a horizontal portion of the center section are provided a pair of linear oil passages in parallel to each other. A pair of arcuate ports are provided on a pump mounting surface formed on the horizontal portion of the center section. The pair of arcuate ports are substantially perpendicular with respect to the direction in which the oil passages extend. The axis of slanting movement of a movable swash plate of the hydraulic pump extends laterally of the vehicle body on which the axle driving apparatus is provided. The rotating direction of an arm provided on a control shaft for slantingly operating the movable swash plate is coincident with the operating direction of a control rod connected with a speed changing member. Thus, the link mechanism for connecting the speed changing member and the control arm for the movable swash plate is simplified.
    Type: Application
    Filed: April 28, 2009
    Publication date: October 22, 2009
    Inventors: Kenichi TAKADA, Ryota Ohashi, Hironori Sumomozawa, Hiroaki Shimizu
  • Patent number: 7599732
    Abstract: According to one embodiment of the invention, a method for biomedical imaging includes directing time-varying excitation light at a surface area of a light scattering material, the material comprising a fluorescent target. Time-varying emission light from the fluorescent target is detected, substantially at a two-dimensional sensor surface, in response to the time-varying excitation light stimulating the fluorescent target. The time-varying emission light is filtered to reject excitation light re-emitted from the material. A three-dimensional image of the fluorescent target is generated based on the detection substantially at the sensor surface.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: October 6, 2009
    Assignee: The Texas A&M University System
    Inventors: Eva M. Sevick-Muraca, Alan B. Thompson, Roy Ranadhir
  • Patent number: 7568504
    Abstract: The invention regards a hydraulic cylinder (1) or a plug comprising a hydraulic cylinder for operation of anchoring and or sealing devices, where the hydraulic cylinder comprising a cylinder chamber (6), a piston head (4) within said cylinder chamber (6) forming two sub chambers (7, 7?) of said cylinder chamber (6) one on each side of the piston head (4), and a piston rod (5) which runs through the piston head (4) and said two sub chambers (7, 7?) or only one of said cub chambers. The hydraulic power unit (8) for operation of the hydraulic cylinder (1) is situated at least partly within the parts forming the hydraulic cylinder (1) itself, preferably the piston head (4) and or the piston rod (5).
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: August 4, 2009
    Assignee: TDW Offshore Services AS
    Inventors: Harald Syse, Jostein Aleksandersen
  • Patent number: 7267043
    Abstract: Actuator assemblies comprise an actuator element and two piezoelectric assemblies, with the two piezoelectric assemblies being configured and arranged for controlling movement of the actuator element. In some example implementations, the first piezoelectric assembly and the second piezoelectric assembly are constructed and arranged so that a temperature dependency of the first piezoelectric assembly is cancelled by the temperature dependency of the second piezoelectric assembly. In a first example embodiment, a first piezoelectric assembly comprises a first or main piezoelectric diaphragm connected to the actuator element for displacing the actuator element in response to displacement of the first piezoelectric diaphragm. The first piezoelectric diaphragm and the second piezoelectric diaphragm are fixedly mounted to a movable carriage.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: September 11, 2007
    Assignee: Adaptivenergy, LLC
    Inventors: David D. Wright, James Vogeley, Edward T. Tanner
  • Patent number: 7249458
    Abstract: The hydraulic linear actuator system of the present invention includes a pump that is configured to rotate in a single direction at a substantially constant velocity. Both the direction and flow rate of fluid through the system is controlled by adjusting the positional relationship between the stator and the rotor of the pump. This positional relationship is adjustable between a forward flow state, a non-flow state and a reverse flow state. The hydraulic linear actuator is responsive to the flow of fluid through the system so as to be displaced in a first direction by the forward flow state of the pump and in a second direction by the reverse flow state of the pump.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: July 31, 2007
    Assignee: Ashradn Holdings Ltd.
    Inventors: Aviram Arbel, Alexander Cohen, Hertzel Perry
  • 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: 7191593
    Abstract: The system includes a hydraulic powered actuator. A pump system having first and second hydraulic lines is coupled to the first and second ports, respectively and is capable of providing hydraulic fluid to either the first and second lines. First and second pressure sensors are coupled to the first and second lines, respectively. A third line is coupled between the first and second lines and includes first and second valves mounted in series therein. Preferably, the first and second valves are capable of latching in the open position. A reservoir is coupled to the third line between the first and second valves. A shut off valve is included for cutting off the flow from the reservoir.
    Type: Grant
    Filed: November 28, 2005
    Date of Patent: March 20, 2007
    Assignee: Northrop Grumman Corporation
    Inventor: Yuhang Ho
  • 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: 7155905
    Abstract: A power steering apparatus includes a hydraulic power cylinder, and a reversible pump driven by a motor. A steering assist sensor senses a steering assist force provided to a steering wheel. A controller ascertains a pump discharge quantity of the reversible pump, and a cylinder volume variation of the pressure chambers of the hydraulic power cylinder; and calculates a leak quantity of the reversible pump from a difference between the pump discharge quantity and the cylinder volume variation. The controller controls the motor to cause the motor to produce a desired fluid pressure in accordance with the steering assist force and the leak quantity.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: January 2, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Masakazu Kurata, Tadaharu Yokota
  • Patent number: 6889501
    Abstract: A hydraulic swinging-leaf door drive for swinging doors includes an actuating piston, which acts on a drive shaft. A hydraulic pump acts on the actuating piston by way of a hydraulic circuit. The hydraulic circuit is designed as a closed circuit.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: May 10, 2005
    Assignee: Dorma GmbH + Co. KG
    Inventor: Sven Busch
  • Patent number: 6886331
    Abstract: A magnetohydraulic motor with a positive displacement pump that pumps hydraulic fluid to and from the two sides of a bi-directional piston that provides the motor's output force and motion. Motion control is provided by properly controlling valves that selectively open and close fluid passageways between the actuator member and each side of the piston.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: May 3, 2005
    Assignee: Energen, Inc.
    Inventor: Chandrashekhar H. Joshi
  • Publication number: 20040163386
    Abstract: A tandem electrohydrostatic actuator (70) broadly includes a first piston (22) operatively arranged in a first cylinder (23), and a second piston (24) operatively arranged in a second cylinder (25). The pistons are coupled to move together. The first piston has a small extend area (35) and a large retract area (36). The second piston has a large extend area (38) and a small retract area (39). The large areas (36, 38) of the pistons are equal to one another and the small areas (35, 39) of the pistons are equal to one another. A reversible fixed-displacement first pump (45) has equal inlet and outlet flows supplied to the small areas of the first and second pistons, respectively. A reversible fixed-displacement second pump (40) has equal inlet and outlet flows supplied to the large areas of the first and second pistons, respectively. The total volume of the fluid in the actuator remains constant at all positions of the pistons.
    Type: Application
    Filed: February 21, 2003
    Publication date: August 26, 2004
    Applicant: Moog Inc.
    Inventors: John D. Kopp, Thomas P. Neal
  • Publication number: 20030205045
    Abstract: The present invention is a hydraulic actuated artificial muscles for use with orthetic devices, prosthetic devices or as an actuator for other applications in medical or robotic devices. Working fluid is pumped between two expandable fluid-containing cells, which are complimentary active elements of the artificial muscle. This eliminates the need for a storage reservoir, thereby providing a self-contained, force efficient device. Each of the preferred embodiments describe has one or more expandable fluid-containing cells that are defined by at least one flexible wall. The flexible walls are configured so as to have elastic properties that are limited to predefined directions of expansion and contraction.
    Type: Application
    Filed: May 3, 2002
    Publication date: November 6, 2003
    Inventor: Zalman Peles
  • Patent number: 6637200
    Abstract: A hydraulic actuator that is capable of substantial actuation but does not require a conventional pump, uses only deflectable membranes and passive valves, or, at most, a minimum of active valves, and, under certain circumstances, may be free to move when the actuator is de-energized, is provided. The actuator utilizes the deflectable membranes to move fluid throughout the actuator. The movement of the fluid actuates a shaft or other suitable device, as required.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: October 28, 2003
    Assignee: Smiths Industries Aerospace Actuation Systems, Inc.
    Inventors: Valentin Barba, Khoi T. Vu
  • Patent number: 6625983
    Abstract: An hydraulic power system having a reversible motor operating a pump to deliver liquid under pressure to operate an actuator mechanism, where the motor is submerged within the liquid inside a reservoir. Flow direction of the liquid is controlled by alternating the direction of rotation of the motor and pump.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: September 30, 2003
    Inventor: Kim Kawasaki
  • Patent number: 6520731
    Abstract: A control system for swing cylinders to position a boom on a backhoe or the like includes a pair of double acting hydraulic cylinders on the backhoe frame operatively connected to the boom for swinging the boom with respect to the frame, a closed circuit pump arranged in a closed circuit with the hydraulic cylinders such that the control on the pump is the sole means of controlling the cylinders.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: February 18, 2003
    Assignee: Sauer-Danfoss, Inc.
    Inventor: Ian J. C. MacLeod
  • Patent number: 6519939
    Abstract: A hydraulic system manifold having a body, a counterbalancer in the body and a flow controller in the body is disclosed. The body has first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduits in communication with the first and second pump ports, the counterbalancer and the flow controller. The counterbalancer is in communication with the first and second supply conduits and the cylinder ports, to communicate hydraulic fluid between the first and second supply conduits and the first and second cylinder ports while counterbalancing hydraulic fluid pressure in the first and second supply conduits. The flow controller is in communication with the first and second supply conduits and the compensator ports, to control the flow of hydraulic fluid between the compensator ports and the first and second supply conduits to supply and store hydraulic fluid in a volumetric compensator in communication with the compensator ports.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: February 18, 2003
    Assignee: M-Mac Actuators, Inc.
    Inventor: Michael Alexander Duff
  • Patent number: 5749224
    Abstract: An electrohydraulic actuator has a housing divided into pump and cylinder portions respectively containing a centrifugal impeller driven through a hub by an externally mounted motor, and a pushrod actuated by a piston and arranged to advance the piston and pushrod to deliver thrust when the motor is operated. The major parts except the motor and the pushrod are castings and only one size castings are required for a large range of thrust capacities. The impeller casting is machined to a diameter suitable for a desired thrust and a motor of required speed and horsepower for that thrust capacity is selected to drive the impeller.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: May 12, 1998
    Assignee: Patriot Sensors & Controls Corporation
    Inventors: Douglas W. Bebensee, Michael J. Stringer
  • Patent number: 5419401
    Abstract: A load control device applicable on agricultural machinery in general and in particular on machinery used for direct planting, so that the working components in contact with the ground will maintain the same load constantly at all times for any ground profile condition. An oil-pneumatic device is provided with a fluid compressor connectable to the tractor's power take-off by a cardan shaft and an electromagnetic clutch that can be powered from the tractor's electrical system or by an independent source, including a compressor with its associated pressurestat which governs it in order to maintain the air pressure required by the circuit. The compressor supplies a tank of compressed air, to which is connected at least one hydraulic cylinder whose upper and lower chambers are each connected to intermediate air and oil collecting reservoirs.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: May 30, 1995
    Assignee: AVEC S.R.L.
    Inventor: Roberto C. Castagno
  • Patent number: 5117633
    Abstract: A pneumatically driven hydrostatic actuator and a pneumatically driven recirculating hydraulic actuator are provided. Each of these actuators consists of a hydraulic pump fluidly coupled to an actuator. The pump is driven by a low inertia pneumatic motor that extracts pressure energy from pressurized gas and converts it to rotary motion. The pneumatic motor is preferably made from stainless steel A286 so that it can operate using pressurized hydrogen gas. The components of both actuators are in a closely coupled relationship so that they can be arranged in a compact unitary package.
    Type: Grant
    Filed: July 10, 1990
    Date of Patent: June 2, 1992
    Assignee: Allied-Signal Inc.
    Inventors: Jacob Bayer, Shek M. Cheung, William F. Ryan
  • Patent number: 5107677
    Abstract: An improved hydraulic door actuator comprising a hydraulic fluid pump having first and second ports; integral operating cylinder and fluid control apparatus including a barrel coupled at each end to the first and second ports of the hydraulic fluid pump; a piston fluidly sealed within the barrel; and means for controlling the flow of fluid of the hydraulic fluid pump to and from the barrel disposed between the barrel and the first and second ports such that the door automatically slows to a stop upon opening or closing wherein the fluid flow control means comprises a plurality of openings disposed along the length of the barrel for bypassing pressurized fluid from the barrel.
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: April 28, 1992
    Assignee: Vertran Manufacturing Company
    Inventor: Nicholas Ribaudo
  • Patent number: 5105622
    Abstract: A hydraulic cylinder has a piston in it with a rod projecting out of the cylinder and connectable with a tool which is operable by movement of the piston rod. A high pressure space is defined in the cylinder at one side of the piston and a low pressure space is defined at the other side of the piston. A partition defines the other end of the low pressure space. A diaphragm on the other side of the partition defines an equalizing space between the diaphragm and the partition. A low pressure line is in communication with the low pressure space and with the equalizing space. A change over valve in the lines to both the high pressure space and the low pressure space enables connection of high pressure from a pump either to one space or to the other space in the cylinder while always permitting communication from the low pressure line to the equalizing space, the connection to the equalizing space is in the low pressure line between the change over valve and a non-return valve at the pump.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: April 21, 1992
    Assignee: FAG Kugelfischer
    Inventor: Dietmar Lindner
  • Patent number: 4974994
    Abstract: Hydrostatic drives for wave generating apparatus in swimming pools require a large amount of energy. A hydrostatic drive for the wave generating apparatus is provided which allows that part of the kinetic energy of the rearwardly moving water to be transformed into hydraulic energy, which in turn is used to impart onto the water a forward movement.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: December 4, 1990
    Assignee: Mannesmann Rexroth GmbH
    Inventors: Herwig Kirstein, Gerd Schmitt
  • Patent number: 4969349
    Abstract: A dual axis actuator consisting of two fluid cylinders having the fluid inputs to the cylinders connected in parallel to a source of pressurized fluid, resulting in an automatic sequencing of cylinder rod drives. The cylinder rod encountering the least resistance to motion extends first until it reaches a stop, followed by the extension of the second cylinder rod. In the preferred embodiment of the invention, the source of fluid input to the two fluid cylinders is derived from the fluid port of a third fluid cylinder having its cylinder rod driven by an external power source. By utilizing two port fluid cylinders, the dual axis actuator can be adapted to provide a sequence of drives for powering workpiece transferring units in a multiple workstation transfer press. Such a system provides an automatic sequencing of translations for engaging and lifting workpieces for movement to a subsequent work station, followed by lowering and retracting from workpieces to allow the next stroke of the press.
    Type: Grant
    Filed: June 15, 1989
    Date of Patent: November 13, 1990
    Inventor: John H. Maher
  • Patent number: 4831825
    Abstract: A device for feeding energy to a cylinder rotationally mounted on a stationary machine part includes a hydraulic pump disposed in the cylinder, and a transmission device located between the stationary machine part and the hydraulic pump, the transmission device being engageable with the hydraulic pump at a drive side thereof for driving the pump.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: May 23, 1989
    Assignee: Heidelberger Druckmaschinen AG
    Inventor: Willi Jeschke
  • Patent number: 4811562
    Abstract: A compact electric adjusting drive for locking systems, fan flaps or the like in motor vehicles includes a fluidic force transmission system between the electric motor and the adjusting element movable to and fro between two end positions.
    Type: Grant
    Filed: November 3, 1987
    Date of Patent: March 14, 1989
    Assignees: Daimler-Benz Aktiengesellschaft, Bornemann & Haller KG, Walter Alfmeier GmbH & Co.
    Inventors: Ruediger Hoffmann, Dieter Feichtiger, Josef Schumacher, Peter H. Haller, Klaus-J. Heimbrodt
  • Patent number: 4773218
    Abstract: A pulse-actuated hydraulic pump includes a hydraulic chamber with a bellows having a volume increased or decreased by the selective application a force in an axial direction thereof by a piezoelectric actuator. Control means control electrically-driven valves to selective discharge fluid from the bellows in precisely controllable volumes through a first pumping port or a second pumping port.
    Type: Grant
    Filed: June 18, 1986
    Date of Patent: September 27, 1988
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Naomasa Wakita, Kanji Ohya, Masatoshi Kuwata, Shuzo Hattori, Makoto Okuda
  • Patent number: 4759186
    Abstract: The hydraulic actuator (35) utilizes the centrifugal head developed in its pressure chambers (52,54) when the housing (44) rotates as a source of pressure. As actuator (35) rotates fluid exits outlet port (56) and passs through a servovalve (64) into chamber (54) to move vane (49) relative to the actuator (35). To move vane (49) in the other direction, fluid exits outlet port (58) and passes through the valve into chamber (52). This self-powered actuator has utility in systems requiring relative angular positioning between a pair of rotating elements such as a pair of voltage regulator rotors in a dual permanent magnet generator.
    Type: Grant
    Filed: December 26, 1985
    Date of Patent: July 26, 1988
    Assignee: Sundstrand Corporation
    Inventor: Kenneth B. Sugden
  • Patent number: 4642986
    Abstract: (a) Hydraulic servo motor comprising a jack (1, 14) intended to be connected by its rod (3.sub.1, 3.sub.2, 15.sub.1) to a moving member to be displaced and accurately positioned, said jack being completely filled with liquid;(b) Servo motor characterized in that the displacement of the piston (2) is implemented by direct liquid transfer from one chamber to the other chamber of the jack by at least one electric vibrator pump (6) supplied by an alternating current power source and in that a so-called electro valve (7), normally open when not in operation, is connected in order to make the two jack chambers communicate;(c) The invention relates to hydraulic servo motors.
    Type: Grant
    Filed: December 13, 1983
    Date of Patent: February 17, 1987
    Inventor: Jacques H. Chatelin
  • Patent number: 4428422
    Abstract: A retractable anchoring device for a sonde to be lowered into a well for logging purpose, is adapted to rigidly position the sonde at a preselected depth. The device comprises pivotable anchoring arms adapted to apply against the wall of the well a substantially constant force produced by associated jacks actuated by driving means so as to apply to the respective arms forces which are limited by specific valves therefor in the hydraulic circuit feeding of the jacks.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: January 31, 1984
    Assignee: Institut Francais du Petrole
    Inventor: Jean Laurent
  • Patent number: 4409789
    Abstract: A power steering system, particularly advantageous for use on electric powered vehicles, in which the hydraulic pump operates only when steering commands are given. Torque applied to the steering shaft by rotation of the steering wheel is translated to axial stress on a thin walled tube, the direction and intensity of which depend on the direction and amount of steer angle change commanded. The axial stresses are detected by strain gages, and the motor which powers the hydraulic pump is activated only when stress is detected. Manual steering inputs enter the pump on one side, and the powered servo motor inputs enter on the opposite side, thus permitting the vehicle to be steered by manual input alone if the powered input fails. The components of the system are arranged in coaxial alignment, providing a compact system with improved heat dissipation qualities.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: October 18, 1983
    Assignee: Clark Equipment Company
    Inventors: Howard C. Hansen, Willard L. Chichester
  • Patent number: RE39158
    Abstract: A hydraulic system manifold having a body, a counterbalancer in the body and a flow controller in the body is disclosed. The body has first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduits in communication with the first and second pump ports, the counterbalancer and the flow controller. The counterbalancer is in communication with the first and second supply conduits and the cylinder ports, to communicate hydraulic fluid between the first and second supply conduits and the first and second cylinder ports while counterbalancing hydraulic fluid pressure in the first and second supply conduits. The flow controller is in communication with the first and second supply conduits and the compensator ports, to control the flow of hydraulic fluid between the compensator ports and the first and second supply conduits to supply and store hydraulic fluid in a volumetric compensator in communication with the compensator ports.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: July 11, 2006
    Assignee: M-Mac Actuators, Inc.
    Inventor: Michael Alexander Duff