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| Number | Title | Issue Date |
| 8161742 | Electro-hydraulic actuator mounting An electro-hydraulic actuator includes a hydraulic pump, an electric motor operatively connected to the hydraulic pump and operable for driving the pump, an actuator moveable in response to fluid flow from the pump, and a housing for the pump, electric motor and act... | 04/24/2012 |
| 8079215 | System and device for uncoupling hydraulic plants System for controlling the motion of an actuator of a hydraulic system that may be embodied as a circuit or device that, interposed between a pump and the actuator, controls the motion of the actuator, causing the actuator to follow the movement of the pump. The pre... | 12/20/2011 |
| 7658066 | Actuation device The present invention relates to an actuation device for the actuating of an adjustment surface of an aircraft such as an elevator, a rudder or the like, of landing gear or another aircraft or surface vehicle actuator, comprising an electrohydraulic actuator having ... | 02/09/2010 |
| 7546730 | Hydraulic vehicle stabilizer system with two-stage bi-rotational hydraulic pump system A stabilizer system and method that can provide high speed, relatively low force extension and retraction of a stabilizer leg during a first portion of a stroke, and low speed, relatively high force extension and retraction during a second portion of the stroke. Acc... | 06/16/2009 |
| 7493757 | Hydraulic pressure supply unit A hydraulic pressure supply unit has two exits that are alternately pressurized, a reversible pumping unit including at least two pumps, reversible electric motor that drives all pumps jointly, if necessary with mutually de-locking check valves before the exits, and... | 02/24/2009 |
| 7434395 | Apparatus and method for dual mode compact hydraulic system A dual mode hydraulic actuator, comprising: a housing; a rod secured to a piston, the rod and piston being slidably received within the housing; a first chamber positioned on one side of the piston; a second chamber positioned on another side of the piston; a sealed... | 10/14/2008 |
| 7325398 | Closed circuit energy recovery system for a work implement A closed circuit hydraulic system includes a fluid reservoir, a hydraulic cylinder having a cylinder rod, a bidirectional variable displacement hydraulic pump that pumps fluid to either extend or retract the cylinder rod on demand, a flow control valve for relieving... | 02/05/2008 |
| 7281372 | Hydraulic controller and hydraulic drive unit provided with said hydraulic controller A hydraulic controller in which driving sound and the number of parts can be reduced, and a long service life can be realized, and a hydraulic drive unit provided with said hydraulic controller. The hydraulic controller for a hydraulic drive unit includes a housing ... | 10/16/2007 |
| 7254945 | Operate check valve and hydraulic driving unit An operate check valve saves space and performs multiple functions by absorbing and integrating a switching valve. A switching valve for controlling the flow of a hydraulic fluid in both normal and reverse directions is coaxially contained with a check valve in a sp... | 08/14/2007 |
| 7249458 | Self-contained hydraulic actuator system 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 positio... | 07/31/2007 |
| 7234298 | Hybrid hydraulic system and work machine using same A hydraulic system and work machine are provided, the hydraulic system including at least one hydraulic cylinder with a first port and a second port connected by a first fluid passage. A first pump, which is a bi-directional hydraulic pump is positioned within the f... | 06/26/2007 |
| 7191593 | Electro-hydraulic actuator system 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... | 03/20/2007 |
| 7185939 | Hydraulic drive system for vehicle roofs The invention relates to a hydraulic drive system used for the covers of vehicle openings, in particular for vehicle roofs with a construction that can be opened. In said system, the actuator that is designed to displace the cover is supplied with a bulk current, wh... | 03/06/2007 |
| 7174988 | Power steering system 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 pa... | 02/13/2007 |
| 7155910 | Dual, coupled check valve for direct drive, reversible power sources for hydraulic systems An invented dual, coupled check valve mechanism is described for a direct drive, reversible hydraulic power source for hydraulic circuits that includes a manifold hydraulically coupled to the respective input/output ports and a reservoir of the hydraulic power sourc... | 01/02/2007 |
| 7108324 | Vehicle seat adjuster A pneumatic seat adjuster for moving a vehicle seat relative to a floor of the vehicle includes a body having a bore formed therein. The body is adapted to be connected to one of a floor and a vehicle seat. A piston is slidably disposed in the bore of the body. The ... | 09/19/2006 |
| 7100697 | Method and apparatus for reforming tubular connections The present invention generally relates to methods and apparatus for connecting tubulars and reforming the connection between the tubulars. In one aspect of the invention, the tubulars are aligned, connected, and then reformed at the connection. In one embodiment, t... | 09/05/2006 |
| RE39158 | Hydraulic system, manifold and volumetric compensator 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 conduit... | 07/11/2006 |
| 7055320 | Actuator An actuator comprises a pump-driving section which is driven and rotated by a current, and a pump mechanism which is connected to the pump-driving section and which sucks/discharges a pressure oil. A cylinder mechanism, which has a piston that is displaceable in the... | 06/06/2006 |
| 7051526 | Closed-system electrohydraulic actuator An electrohydraulic actuator (10) includes a fluid-powered actuator (11) having a piston (15) in a cylinder (16). The piston divides the cylinder into two opposed chambers (18, 19). The actuator includes a fixed-displacement revers... | 05/30/2006 |
| 7028586 | Apparatus and method relating to tongs, continous circulation and to safety slips A tong system includes an upper tong having grips for gripping a tubular and a rotation mechanism to rotate the grips and the tubular. A lower tong also has grips and a rotation mechanism to rotate the grips to provide rotation to a lower tubular, such that the uppe... | 04/18/2006 |
| 7028585 | Wrenching tong Apparatus for applying torque to a first tubular relative to a second tubular, the apparatus comprising a first tong for gripping the first tubular and a second tong for gripping the second tubular, wherein the first tong is provided with teeth around a peripheral s... | 04/18/2006 |
| 6984113 | Oil pressure operated pump for marine steering gears with a valve set shell with valves separately capable of assembly with the valve housing An oil pressure operated pump for marine steering gears includes a multiple piston oil pressure operated pump controlled by a steering wheel, a valve housing mounted under the pump, a bottom cover closing the valve, the valve housing and the cover each including cha... | 01/10/2006 |
| 6979185 | Bi-rotational pump/hydraulic actuator A novel bi-rotational pump adapted to pump fluid in either of two directions by reason of construction inclusive of passageways and an array of check valves and pilot pistons which cooperate in one direction and in another way in the other direction. ... | 12/27/2005 |
| 6962050 | Hybrid machine with hydraulic drive device A hybrid machine with a hydraulic drive device having hydraulic actuators allowed to operate against and by external loads is provided. To this end, the hybrid machine comprises hydraulic cylinders (7), first hydraulic pumps (P1) connected, with closed... | 11/08/2005 |
| 6953102 | Power steering system A power steering system includes: a first drain passage for draining an oil pressure from a first oil passage, a second drain passage for draining the oil pressure from a second oil passage, and a pair of a first and second switch valves. When one of the first oil p... | 10/11/2005 |
| 6912849 | Cylinder driving system and energy regenerating method thereof A cylinder driving system capable of reducing the number of hydraulic devices and the amount of energy loss and an energy regenerating method thereof are provided. To this end, the system includes i) a hydraulic cylinder, ii) a hydraulic pump having three suction/di... | 07/05/2005 |
| 6892534 | Electro-hydrostatic actuator with a failsafe system An electro-hydrostatic actuator unit that contains a sealed pressurized housing filled with a dielectric fluid. A bi-directional motor is immersed in the fluid and drives a gear pump for exchanging fluid via a control circuit between the chambers of a bi-directional... | 05/17/2005 |
| 6886332 | Bi-rotational, two-stage hydraulic system A hydraulic system for an actuator provides staged operation during extend and retract. A pair of reversible pumps are conjointly driven by a reversible motor. A relief valve in the retract circuit directs fluid to tank when fluid pressure increases above a predeter... | 05/03/2005 |
| 6851507 | Power steering system A power steering system includes: a first drain passage for draining an oil pressure from a first oil passage, a second drain passage for draining the oil pressure from a second oil passage, and a pair of a first and second switch valves. When one of the first oil p... | 02/08/2005 |
| 6817067 | Tandem electrohydrostatic actuator 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 ... | 11/16/2004 |
| 6813885 | Electrohydraulic setting device An actuating device (1) for carrying out mechanical work by means of a slave piston rod (5) in a hydraulically-operated slave cylinder (2), where the actuating device (1) is made up of a hydraulic pump (3) integrated with a slave c... | 11/09/2004 |
| 6769251 | Hydraulic system architecture for controlling steering The invention relates to an architecture for a hydraulic steering control system including at least one actuator; the hydraulic system comprises a directional-control valve connected to a pressure-generator device and to an associated main supply, the hydraulic syst... | 08/03/2004 |
| 6764126 | Hydraulic actuating device for a cover with associated lock A hydraulic actuating device, for a vehicle cover and an associated lock for locking the cover in the closed position, has a cover actuator and a lock actuator which each are provided with a first and second connection, which are respectively in communication with a... | 07/20/2004 |
| 6751953 | Hydraulic actuating device for a closure assembly A hydraulic actuating device for a closure assembly, for example of a vehicle, which closure assembly comprises a closure element which can be moved between a closed position, in which the closure element closes off an opening, and an opened position. The hyd... | 06/22/2004 |
| 6739130 | Linear actuator The linear actuator comprises two variable-volume chambers (5) containing an operative liquid, each of the chambers (5) being delimited on one side by one of two mobile elements (4), which mobile elements (4) are solidly constrained one t... | 05/25/2004 |
| 6722270 | Hydraulic press A hydraulic press which is small in the temperature rise of hydraulic oil, which can dispense with a water-cooling cooler, which is compact in size and which can realize energy saving is provided. A pressure receiving area of a high speed descent first cylinder cham... | 04/20/2004 |
| 6718766 | Pump-integrated flexible actuator A pair of flexible actuators according to the present invention is supported by a fixture made of a hard rubber at base ends of the flexible actuators. Each flexible actuator includes a movable unit that is capable of bending, a pump unit integrally connected to the... | 04/13/2004 |
| 6647870 | Drive apparatus, press machine slide drive apparatus and method thereof An electric motor and hydraulic pump/motor are combined on a torque level, a press machine is controlled with controllability of an electric motor, and kinetic energy of a slide is regenerated during braking without constraints of slide pressurization or ... | 11/18/2003 |
| 6647719 | Hydraulic oscillator as a drive of machines The invention proposes a novel drive with electrical power control for machines which have to execute cyclic movements with high accelerations. An electric motor drives a pump which, in turn, is connected directly to a cylinder. This arrangement has added... | 11/18/2003 |
