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| Number | Title | Issue Date |
| 7891180 | Actuator servo-control monitoring method and device An actuator displacement servo-control for aircraft flight controls is assisted by a hydraulic circuit, configured to deliver a hydraulic failure indication. The servo-control is generated from an actuator position indication and a position set-point indication comp... | 02/22/2011 |
| 7849687 | Electrohydraulic solar panel carrier adjusting device A solar panel carrier T is provided at a sub-structure U such that it can be rotated and tilted by means of hydrostatic rotation and tilt motors M, M′. In an electrohydraulic adjusting device for the solar panel carrier T a motor pump aggregate 8 is connect... | 12/14/2010 |
| 7426827 | Suspension arrangement for a boom assembly mounted on an agricultural sprayer A system for reducing oscillating movement of a boom assembly about a fore-and-aft aligned axis defined by a pivotal connection of a suspension arrangement independent of a carrier frame is provided. The system includes an accumulator, a cylinder actuator mechanical... | 09/23/2008 |
| 7395663 | System for and method of locking a roll suspension arrangement for a boom assembly mounted on an agricultural sprayer A system to lock a roll-suspension arrangement operatively connected to allow pivotal movement of a boom assembly about a fore-and-aft axis independent of a carrier frame is provided. The system includes an actuator cylinder having an end movable in a linear directi... | 07/08/2008 |
| 7322270 | Safety circuit for media-operated consumers and process for its operation A safety circuit for media-operated consumers, such as steam turbines or gas turbines, includes at least one first solenoid valve (1.1) which acts on a fluid circuit. An actuating device (9) can be connected to the fluid circuit, and acts at the same t... | 01/29/2008 |
| 7131238 | Method of testing seismic braces Braces for bracing objects in structures against forces due to earthquakes are tested by subjecting components of the braces for attaching the braces to the object or structure to cyclic loading of approximately 15 cycles. The cyclic forces are applied to different ... | 11/07/2006 |
| 7082756 | Device for detecting failure of hydraulic motor, and hydraulic vehicle A failure detection device for a hydraulic motor of the present invention comprises a hydraulic pump 3 that is driven by a prime mover 2; a hydraulic motor 1 that is driven by hydraulic oil discharged from the hydraulic pump 3; an abnorma... | 08/01/2006 |
| 7044024 | Apparatus and method for servo control of an aircraft Autopilot control of an aircraft is accomplished using a servo wherein the input shaft and output shaft are collinear. In one embodiment, the output shaft is supported, in part, by the input shaft. In further embodiments an engage clutch mechanism is provided to all... | 05/16/2006 |
| 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 |
| 6786132 | Control device for hydraulically operated hoisting mechanisms A control device for hydraulically operated hoisting mechanisms used to raise and lower loads includes an electrically controllable throttle valve connected to a return line of the hoisting mechanism, and a pressure scale with at least one blocking position and one ... | 09/07/2004 |
| 6769250 | Fluidic system with a safety function A fluid control system for security relevant control and a fluid control actuator, a local control means for a fluid control system, a software module for a local control means of a fluid control system and a method for the operation of a fluid control system. The f... | 08/03/2004 |
| 6708489 | Pneumatic actuator A double-acting, piston driven actuator for providing a double action rotary powered output, having a stepped bore housing a double acting piston having a larger diameter end and a smaller diameter end therein; a three way valve selectively to supply pressurized flu... | 03/23/2004 |
| 6679053 | Device for preventing unintentional restarting A device for preventing the unintentional restarting of motors or machines is proposed, it being possible to control the supply of energy to the motor or to the machine by means of a control valve with a mechanically adjustable control element and it bein... | 01/20/2004 |
| 6446432 | Hydraulic logic cross-coupling between physically-separate redundant servoactuators A redundant control actuation system (100) provides hydraulic logic cross-coupling between physically-separate servoactuators (101A, 101B). Each servoactuator has a control valve (102A, 102B) arranged to provide a hydraulic output in response to a control... | 09/10/2002 |
| 6417640 | Displacement sensors for servo-control actuators A structure comprising firstly a differential sensor of linear displacement comprising a body and a core slidably mounted relative to said body, and secondly a rod of a servo-control actuator in which the core is mounted, said rod terminating in an endpie... | 07/09/2002 |
| 6220026 | Active control system Active control system for a movable member, in particular a tailgate or door, includes a pump unit which is connected by at least one fluid connecting line to a piston-cylinder unit. The control system has an on-off valve through which the direction of mo... | 04/24/2001 |
| 6131389 | Hydrostatic steering device with two steering systems A hydrostatic steering device having substantially identical first and second steering systems, each including a pump connected to a steering unit, which is connected to a steering motor by two motor hoses. A steering wheel is common to both steering unit... | 10/17/2000 |
| 6059228 | Hydraulic system A hydraulic system for retracting into and extending out of the body of an aircraft a landing gear for use in taking off and landing, comprises a housing unit which has a hydraulic pump, a hydraulic actuator, a shuttle valve, an emergency valve, an actuat... | 05/09/2000 |
| 6058826 | Power steering cylinder assembly A power steering cylinder assembly including a cylinder divided by a piston into opposite chambers and a valve controlling flow between a pump, a tank and the chambers. Bypass passages selectively connects the opposite chambers when there is no flow from ... | 05/09/2000 |
| 6019026 | Self-centering motor A self-centering motor (16) includes a piston (130) which is disposed in a housing (112) and is movable in opposite directions from a centered condition. A pair of centering members (160 and 162) are disposed in the housing (112) to effect movement betwee... | 02/01/2000 |
| 5951265 | Fluid driven reciprocating engine or pump having overcenter, snap-action mechanical valve control A fluid driven reciprocating engine includes a main body having an inlet for receiving a primary fluid and an outlet for discharging the fluid. A drive piston is sealingly mounted in the main body for reciprocating movement in response to flow of the prim... | 09/14/1999 |
| 5950427 | Fail-safe electric hydraulic actuator An electro-hydraulic valve actuator comprising an actuator casing; a piston/rack means in the casing having walls reciprocating linearly to effect linear movements, the reciprocating walls defining a center chamber therebetween and two outside chambers in... | 09/14/1999 |
| 5899064 | Servo-actuator with fail safe means The present invention provides a servo-actuator capable of operating in both the Fail Safe and Fail Operate modes. In the Fail Safe mode, a pretensioned spring member moves a jet pipe in the servo-valve to cause said actuator rod to move in a first direct... | 05/04/1999 |
| 5735122 | Actuator with failfixed zero drift The present invention provides an actuator controlled by an electro-hydraulic servovalve with a failfixed operation upon the loss of electrical power to the servovalve. A lock valve has apertures therethrough with friction pads therein for locking the act... | 04/07/1998 |
| 5634389 | Actuator stiffness enhancing system A fluidic stiffness enhancing circuit for use with a fluid driven piston type actuator includes a fluid conduit arrangement that interconnects two variable volume chambers of the actuator upon occurrence of a loss of system pressure to at least one of the... | 06/03/1997 |
| 5522303 | Machine tool with locking mechanism A machine tool is suggested, which has a headstock (111) and at least one tool changer (120). The tool changer (120) moves production tools (116) between a magazine position and a working position, at least one fluid power drive cylinder (1) being associa... | 06/04/1996 |
| 5490442 | Safety circuit for a servo-hydraulic regulating system A safety circuit for a servo-hydraulic regulating system for the hydraulic control and actuation of load units, such as operating tools on utility vehicles and agricultural machines. The controlling of the load unit is effected via a proportional valve wh... | 02/13/1996 |
| 5484352 | Switch for detecting operation of control valve spool A detector switch of the present invention is capable of confirming that an electrical signal from a controller to an electromagnetic valve has been transformed into the operation of a control valve spool when the speed of a transmission of automobiles or... | 01/16/1996 |
| 5467683 | Actuating drive for a control valve This actuating drive (1) for a control valve (2) has a control circuit which sets the actuating drive (1) to correspond with a specified required value from an overriding installation control system. It has, in addition, a main piston (6) sliding in a mai... | 11/21/1995 |
| 5284083 | System for powering the driving actuator of an aircraft undercarriage The invention relates to a system for powering the driving actuator of an aircraft undercarriage, the system including a hydraulic generator capable of delivering fluid under pressure to one or the other of two chambers of the driving actuator. According ... | 02/08/1994 |
| 5269141 | Hydraulic safety and regulating system This hydraulic safety and regulating system for a steam feed of a turbine has a rapid-action (4) and a steam regulating valve (3), and a line system monitored by a safety downward-control unit (22). The monitored line system is designed as both a power oi... | 12/14/1993 |
| 5020322 | Accumulator blow-back hydraulic circuit A blow-back circuit (10) comprising an accumulator (23) to build up system pressure during normal system operation and an accumulator shut-off valve (13) which prevents dissipation of the accumulator pressure during normal operation. Pressurized fluid is ... | 06/04/1991 |
| 4953445 | Control device with failure detection centering for a double-acting hydraulic jack The invention relates to the control of a hydraulic jack which can be used, for example, for controlling the orientation of the rear wheels of a vehicle with front guiding wheels. In the event of a failure in the supply of fluid under pressure to the cham... | 09/04/1990 |
| 4930311 | Exhaust and inlet line brake valves for hydrostatic motor The invention relates to a safety arrangement for a controlled drive which is connected to a conduit with impressed pressure. When the safety arrangement responds the machine is separated via shutoff valves from the inlet and outlet and a via a switchover... | 06/05/1990 |
| 4647004 | Pneumatic-hydraulic actuator system An actuator system is disclosed which modulates a linear output shaft associated with a working control valve or the like in response to a control signal input. The system includes a feedback control link, a pneumatic positioner, a pneumatically controlle... | 03/03/1987 |
| 4601169 | Check device for a redundant flight control apparatus Check device for a redundant flight control apparatus comprising at least two servo drive devices. Failure in supplying fluid and wedging of a control valve (20) can be simulated. Failure of the bypass valve (35) can be checked by reading and comparing th... | 07/22/1986 |
| 4436245 | Pneumatic control system, especially for vehicle heating systems A control system for controlling the operation of a heating or air conditioning system, especially for the passenger compartment of motor vehicles. The temperature in the compartment is maintained by an electronic controller which receives temperature-rel... | 03/13/1984 |
| 4335867 | Pneumatic-hydraulic actuator system An actuator system is disclosed which modulates a linear output shaft associated with a working control valve or the like in response to a control signal input. The system includes a feedback control link, a pneumatic positioner, a pneumatically controlle... | 06/22/1982 |
| 4232588 | Electrically controlled pipe fracture safety device An electronically controlled pipe fracture safety device for operating devices which are fed by a hydraulic pump and which are actuated by a control slide value by means of hydraulic cylinders. Control lines branch off from lines which lead from the hydra... | 11/11/1980 |
| 4145886 | Tank supply fail safe A sealed tank normally receiving air under pressure is connected with respect to a shuttle valve so that when there is an accidental loss of pressure, the air in the tank moves the valve to a position where the high pressure in the tank is applied to an i... | 03/27/1979 |
