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| Number | Title | Issue Date |
| 7886652 | Positioning control mechanism for single-acting air cylinder An electromagnetic operation-type automatic pressure-adjusting valve outputting an air pressure corresponding to an amount of electric power is connected in an air flow path connecting a pressure chamber of a single-acting main cylinder and an air source. A controll... | 02/15/2011 |
| 7739941 | Hydraulic drive system and method of operating a hydraulic drive system A hydraulic drive system comprises a hydraulic actuator comprising a piston reciprocable between two cylinder heads for actuating a machine. A flow switching device reverses the direction of hydraulic fluid flow to and from chambers on opposite sides of the piston. ... | 06/22/2010 |
| 7520208 | Drive device comprising a position controller A drive device comprises a fluid driven drive (2), which defines a drive space (8), in which at least one drive piston (14) is located which is able to be linearly shifted by fluid actuation and is kinematically coupled with an output drive part... | 04/21/2009 |
| 7421938 | Positioner for a fluid actuator A positioner for a fluid actuator comprising an electronics assembly designed for setpoint/actual value comparison and for outputting a feedback control signal includes a current/pressure transducer receiving the feedback control signal for controlling the actuator,... | 09/09/2008 |
| 7277080 | Three dimensional dynamic display system The display system comprises a screen (1) made of an array of metal triangular facets (30) which are driven in and out by an array of pneumatic pistons (2) located behind the screen (1). The rear ends of the pistons (2) are flexibl... | 10/02/2007 |
| 7258640 | Apparatus for compensating viscous characteristics of hydraulic fluid in a hydraulic pressure line An apparatus for compensating the viscous characteristics of a hydraulic medium in a pressure line (10) in which apparatus a pressure nozzle (12) with constant geometry and constant through-flow cross-section is located in the pressure line (10)... | 08/21/2007 |
| 7219691 | Control valve positioner mounting system A positioner for a control valve assembly is disclosed wherein the positioner is mounted internally to thus protect the positioner from damage stemming from environmental, impact, or other outside influences. Accordingly, not only can the position of the valve be ac... | 05/22/2007 |
| 7213672 | Vehicle hydrostatic transmission circuit A hydrostatic transmission circuit for a vehicle having at least two displacement members (12) driven by at least one hydraulic motor (10) having a feed main duct and a discharge main duct (16, 18). Skid control means for controlling skidding of... | 05/08/2007 |
| 7210394 | Method and apparatus for controlling air cylinder A method for controlling an air cylinder such that air is supplied to and exhausted from pressure chambers of the air cylinder by air servo valves. Pressures in the pressure chambers are detected by pressure sensors, signals of the detected pressures are feedback to... | 05/01/2007 |
| 7172257 | Crawler track tension adjusting device A crawler track tension adjusting device is provided in which a driving unit having a closed structure carries out automatic tension adjustment in response to a control signal to create optimum tension on a crawler belt. The crawler track tension adjusting device in... | 02/06/2007 |
| 7143682 | Large manipulator having a vibration damping capacity A large-size manipulator comprises a boom made up of several segments and arranged on a vehicle frame. The boom is foldable and has a slewing track ring rotated about a vertical axis of rotation. The boom segments can be swiveled with respect to each other and with ... | 12/05/2006 |
| 7139621 | Floating deadband control A control system having a floating deadband control includes an input device moveable from a first position to a second position. In addition, the control system includes a controller configured to automatically generate a first electronically defined deadband about... | 11/21/2006 |
| 7104053 | Control method A hybrid actuation system comprises first and second actuator arrangements (10, 12) arranged to apply first and second output loads respectively to a common element (14). A control method for controlling the operation of the hybrid actuation system inc... | 09/12/2006 |
| 7076314 | Precision positioning device and processing machine using the same A precision positioning device comprises a hydraulic cylinder extending along the vertical direction and a piston member accommodated in the cylinder. The inside of the cylinder is divided into two chambers by a piston head of the piston member. A hydraulic circuit ... | 07/11/2006 |
| 6938535 | Hydraulic actuator control A method is provided for controlling hydraulic flow to a hydraulic actuator. The method includes generating a command signal based on an operator input, sensing a linkage position associated with the hydraulic actuator, and selecting a moving rate of a valve associa... | 09/06/2005 |
| 6917515 | Electrical component having a housing retained in a receiving groove in a support through a retaining device An electrical component has a housing received in a receiving groove, which is confined by opposite lateral walls connected to a groove bottom, formed in a support. A retaining device includes a base extending from one end of the housing and disposed on the groove b... | 07/12/2005 |
| 6911904 | System and method for adaptive variable magnetic field generator A system for controlling a magnetic field strength includes a magnetic field generator for generating a magnetic field for receipt by a responsive device and a controller in communication with the magnetic field generator for determining a strength of the magnetic f... | 06/28/2005 |
| 6826998 | Electro Hydraulic servo valve An electro hydraulic servo valve assembly has a valve housing and a spool rotatably fitted to the inside of the housing. A number of ports are off-settedly provided along the length of the valve housing A plurality of orifices are provided along the length of the sp... | 12/07/2004 |
| 6789457 | Gas pressure actuator capable of stably driving and controlling its slider, and method for controlling the gas pressure actuator A controlling and computing device performs the steps of: differentiating a slider position represented by a position detection signal fed from a position sensor, and calculating the velocity of the slider, differentiating the calculated velocity so as to calculate ... | 09/14/2004 |
| 6789458 | System for controlling hydraulic actuator A system and method for controlling at least one hydraulic actuator of a hydraulic system includes a flow rate measurement of a hydraulic fluid flow traveling into and out of a cavity of the hydraulic actuator. The flow rate is used to calculate piston information c... | 09/14/2004 |
| 6786127 | Fluid-actuated linear drive A fluid power operate linear drive possessing a slab housing (2) with an elongated cross sectional outline, in which a plurality of receiving spaces (8) are arranged extending in a common housing plane adjacent to each other in the direction of the lon... | 09/07/2004 |
| 6779432 | Servo circuit for use with air pressure actuator capable of improving speed control performance An air pressure actuator has a partition wall provided on one of a slider and a guide shaft to form two cylinder chambers between the guide shaft and the slider. Intake/exhaust systems are connected with the two cylinder chambers for supplying a compressed air into ... | 08/24/2004 |
| 6772671 | Electrohydraulic motor and hydraulic driving method There is provided an electrohydraulic motor that has a spool valve 110 for switching from each of drive positions (111, 112), in each of which a corresponding one of a main oil passage 230 and a return oil passage 240 is connected to a hy... | 08/10/2004 |
| 6755115 | Working cylinder A fluid power operated fluid power cylinder having a cylinder housing (2) on whose rear side a control system housing (33) is mounted. The control system housing (33) contains a valve means and furthermore a electronic valve circuitry and/or ele... | 06/29/2004 |
| 6705199 | Precision servo control system for a pneumatic actuator A precision servo control system for a pneumatic actuator has a piston positionable over a stroke of the pneumatic actuator using a supply of pressurized gas. A brake and a sensor system are connected to the actuator and to the servo control system. The servo contro... | 03/16/2004 |
| 6651544 | Controlling the deadband of a fluid system A method for controlling a fluid system is provided. The system may include a hydraulic circuit having a pump driven by an engine, wherein the pump delivers fluid to an actuator through a valve assembly. The method may include receiving an operator input ... | 11/25/2003 |
| 6640685 | Closed loop electrohydraulic actuator control circuit A hydraulic control system for controlling expansion and contraction of a cylinder. The cylinder comprises an extension chamber and a contraction chamber. The hydraulic control system comprises a first servovalve comprising a first pressure supply port an... | 11/04/2003 |
| 6612218 | Working vehicle with a working implement displaceable by a hydraulic actuator A working vehicle comprises a working implement (20) supported by the working vehicle to be displaceable by a hydraulic actuator (1), and a controller (16) for generating a control output signal for controlling a position of the working implement in respo... | 09/02/2003 |
| 6609369 | System and method of pressure compensation for electro hydraulic control systems A pressure compensator for use in a control system for an electro hydraulic-implemented work element being operated through the use of operator input control mechanisms generating operator input signals upon the application thereof, the control system inc... | 08/26/2003 |
| 6523451 | Precision servo control system for a pneumatic actuator A precision servo control system for a pneumatic actuator has a piston positionable over a stroke of the pneumatic actuator using a supply of pressurized gas. A brake and a sensor system are connected to the actuator and to the servo control system. The s... | 02/25/2003 |
| 6408737 | Control method for a hydraulic drive, and a control device corresponding thereto A position control branch for a hydraulic drive is prescribed a desired position. The hydraulic drive is moved to an actual position via the position control branch. It is determined whether the hydraulic drive has come to a standstill. On detection of a ... | 06/25/2002 |
| 6378411 | Working equipment and a control system therefor Operating side link members corresponding to working side link members of a working device are provided in a device for operating working equipment. Rotation of the working side link members is detected by a rotation sensor. A motor is driven in response ... | 04/30/2002 |
| 6257118 | Method and apparatus for controlling the actuation of a hydraulic cylinder An apparatus controllably moves a moveable element within a hydraulic motor. A lever device establishes an operator command signal indicative of a desired velocity and direction of movement of the moveable element. A position sensor senses the position of... | 07/10/2001 |
| 6131500 | System and method for producing motion This disclosure is directed to novel systems and methods for producing motion in response to a drive signal where the motion has a smooth translational reversal. The system accepts a command position signal and compares the command position signal to the ... | 10/17/2000 |
| 6112638 | Electropneumatic positioner having binary input arrangement providing access to electrical output functions thereof The present invention includes an electropneumatic positioner having an external binary input block which provides access to the electrical output of an integral electronic position controller to control operation of a valve relay. The invention enables m... | 09/05/2000 |
| 6076349 | Hydrostatic automotive or high speed steering system A full fluid-linked steering system, especially for use in on-highway steering, in which the system includes a fluid controller (21) including a fluid meter (65) operable to provide follow-up movement to controller valving (87,89), in response to the flow... | 06/20/2000 |
| 5960694 | Hydrostatic power steering system having reduced wheel slip A hydrostatic power steering system comprising a fluid motor (19) which receives pressurized fluid from a controller (17) in response to the rotation of a vehicle steering wheel (W). As the motor (19) or the steered wheels reach the stops, control logic (... | 10/05/1999 |
| 5943940 | Indication means in a brake cylinder for a vehicle brake An indication means in a brake cylinder for a vehicle brake with a spring activated parking brake in which the brake cylinder comprises a cylinder housing (3) with a casing wall (22) and at least one gable (23). A pressure spring (5) is positioned between... | 08/31/1999 |
| 5934169 | Double-acting electropneumatic positioner A double-acting electropneumatic positioner for controlling an actuator, the actuator having a first and second chamber, comprises a single-acting electropneumatic positioner which provides an output pneumatic pressure to the first chamber of the actuator... | 08/10/1999 |
| 5931180 | Electropneumatic positioner An electropneumatic positioner includes a data processing control section and an electropneumatic converter. The control section includes first and second position determining sections and a signal setting section. The first position determining section o... | 08/03/1999 |
