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| Number | Title | Issue Date |
| 7640736 | 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... | 01/05/2010 |
| 7365445 | Apparatus for converting ocean wave energy to electrical energy A wave motion generator having a bore hole at a coastline of an ocean. The bore hole lower end communicates with the ocean underwater while the upper end is above water level, allowing wave motion within the bore hole. A float disposed within the bore hole may trave... | 04/29/2008 |
| 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 |
| 7267043 | Actuators with diaphragm and methods of operating same 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... | 09/11/2007 |
| 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 |
| 7237472 | Linear hydraulic stepping actuator with fast close capabilities 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 ... | 07/03/2007 |
| 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 |
| 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 |
| 7155905 | Power steering apparatus 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, a... | 01/02/2007 |
| 7096772 | System and method for controlling hydraulic fluid flow A method of flowing hydraulic fluid in a work machine is disclosed. The method includes generating a control signal from an input mechanism and generating a property signal indicative of a viscosity of the hydraulic fluid. The control signal and the property signal ... | 08/29/2006 |
| 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 |
| 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 |
| 7025044 | Pump assembly and method A pump assembly includes a high-pressure pump that flows pressurized working fluid in a fuel injection system of a diesel engine. The assembly includes a pilot-operated inlet throttle valve that receives a flow of low-pressure fluid from a feed pump and controls the... | 04/11/2006 |
| 6889501 | Hydraulic swinging-leaf door drive 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. ... | 05/10/2005 |
| 6886331 | Magnetohydraulic motor 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 o... | 05/03/2005 |
| 6637200 | Membrane-activated hydraulic actuator 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... | 10/28/2003 |
| 6625983 | Hydraulic power system 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 altern... | 09/30/2003 |
| 6520731 | Closed circuit swing control system 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 ... | 02/18/2003 |
| 6519939 | 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 sup... | 02/18/2003 |
| 5749224 | Extended range thruster system and method of determining thrust 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 an... | 05/12/1998 |
| 5419401 | Oil-pneumatic load control device 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 pro... | 05/30/1995 |
| 5107677 | Hydraulic door actuator 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; ... | 04/28/1992 |
| 5105622 | Hydraulic unit for driving a tool 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 sp... | 04/21/1992 |
| 4974994 | Hydrostatic drive for wave generating systems in swimming pools 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 transf... | 12/04/1990 |
| 4969349 | Synchronized dual axis actuator 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 re... | 11/13/1990 |
| 4831825 | Device for feeding energy to a cylinder 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 ... | 05/23/1989 |
| 4811562 | Adjusting drive 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.... | 03/14/1989 |
| 4773218 | Pulse actuated hydraulic pump 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 va... | 09/27/1988 |
| 4759186 | Self-powered rotary actuator utilizing rotation-generated centrifugal head 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 cham... | 07/26/1988 |
| 4642986 | Hydraulic servo motor (a) Hydraulic servo motor comprising a jack (1, 14) intended to be connected by its rod (31, 32, 151) to a moving member to be displaced and accurately positioned, said jack being completely filled with liquid; (b) Servo m... | 02/17/1987 |
| 4428422 | Device provided with retractable arms for the anchoring of an instrument in a cavity 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 substa... | 01/31/1984 |
| 4409789 | Power steering system 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 ax... | 10/18/1983 |
| 4267695 | Buoyancy energy engine The engine comprises an elongated, vertical casing within which a buoyancy piston is vertically reciprocal between upper and lower positions. The buoyancy piston bottomly carries a bottom piston plate which is a sliding seal within the interior of the cas... | 05/19/1981 |
| 4041704 | Stop mechanism for a bending press, plate shear or the like machines A stop mechanism for a bending press, plate shear or the like machine, provided with a work-table and with a work-piece stop which is horizontally adjustable along the work table thereby defining the position of the work-piece relative to the machinery, t... | 08/16/1977 |
| 4010609 | Jack-pump device The invention relates to improved jack-pump devices comprising a pump with a sliding piston forming first and second pump chambers, one on each side, a jack with a sliding piston forming first and second jack-chambers, one on each side, a first valve betw... | 03/08/1977 |
