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WO/1997/023734A1 |
A positioning device for controlling a servomotor (2), comprising a two-way valve with a fluid inlet, an outlet and two opposite outputs for powering the movement of the servomotor (2), the slide being coupled via a control mechanism to ...
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WO/1997/016372A1 |
The invention relates to a method in a system using pressurized medium for employing and controlling a hoisting boom assembly particularly in combination with a working machine, the system comprising at least two cylinder-piston mechanis...
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WO/1997/013074A2 |
The invention concerns an electrohydraulic control valve arrangement (10) for controlling the movement of a hydraulic motor. The control valve arrangement (10) comprises a main control valve (11), which can be actuated by the alternating...
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WO/1996/033347A1 |
A double-acting hydraulic cylinder is controlled by a pair of three-way solenoid valves respectively fluid connected to the two ends of the cylinder and energized in parallel with a continuous stream of pulse width modulated (PWM) pulses...
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WO/1996/030650A1 |
A low-cost, precision rotation control apparatus suitable for a large-output rotary actuator. This apparatus comprises a hydraulic rotary servo valve (4) having a rotary spool (40) and a rotary sleeve (20); an electric motor (5) having a...
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WO/1996/012109A1 |
A fluid actuator (11) for use in a fluid injector assembly (10) including a piston (12) arranged for reciprocation in a chamber (14), the piston (12) including a connected plunger (13) operating in an injection chamber (15). A control va...
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WO/1996/007029A1 |
A hydraulic actuating unit (1) is disclosed, having a positioning motor (2) which is arranged in a diagonal of a bridge circuit (3) having four electromagnetic valves (6, 7, 8, 9), the other diagonal being arranged between a pressure sou...
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WO/1996/005543A1 |
A control system is disclosed for hydraulic drives, in particular hydraulic cylinders, in which the valve that controls the hydraulic medium flow paths between the drive, the hydraulic medium source and a tank may be controlled by an ele...
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WO/1996/003586A1 |
The invention concerns a positioning drive which is used in particular for machine tools and which comprises a hydraulic motor (10). The hydraulic motor comprises: a control disc (17) which is rotatable with a motor shaft (18) and is pro...
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WO/1995/024565A1 |
In a hydraulic drive unit having a high-power hydraulic motor as the actuator, a main control valve, a hydraulic servo drive for actuating the main control valve and a tracking regulator valve which is provided for controlling the servo ...
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WO/1995/020781A1 |
A direct drive servovalve which includes as an integral part thereof, a motor rotor position sensor (46). The rotor position sensor (46) is used to generate an electrical signal which is representative of the degree of rotation of the ro...
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WO/1994/027201A1 |
In a control for a drive pressurised by a working fluid, the working fluid flows through an eletrovalve which determines the amount of working fluid to be suplied to the drive. The electric signal which controls the valve is generated by...
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WO/1994/001681A1 |
A fluid-operated power booster includes a housing (12) having a main piston (10) slidably mounted therein and a regulating chamber formed in the main piston. A regulating piston (22) is mounted within the regulating chamber and is fixed ...
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WO/1993/019300A1 |
A hydraulic cylinder (2) having a piston (1) and a linearly extending output shaft (15) controlled by a rotary spool valve (6). The rotary spool valve (6) has a ported outer part (8) rotatable by means of a control lever (7) to pressuriz...
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WO/1993/018445A1 |
A control system, more especially for use in a glassware forming machine, to control movement of a driven member (12), for example carrying molten glass, between first and second rest positions, wherein the member is driven via a pneumat...
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WO/1993/016287A1 |
A positioner (100) for use in pneumatic systems moves a pneumatic operator. The positioner is an electronic pilot positioner or eletronic to pneumatic interface which provides accurate positioning of linear actuators (250) in response to...
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WO/1993/010359A1 |
An air pressure operated apparatus, such as an oscillating air pressure operated apparatus having a cylinder piston type air cylinder and vanes, which apparatus can be moved to an arbitrary position and stopped, moved in the reverse dire...
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WO/1993/001470A1 |
An apparatus (102) is adapted to detect the linear extensions of a plurality of hydraulic cylinders. Each hydraulic cylinder defines a variable length coaxial resonant cavity. Under the control of a controller (112), a transmitting secti...
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WO/1992/022749A1 |
The invention relates to a method and arrangement for controlling a pressure fluid operated apparatus (22) by means of a control unit (1) and valve system (7). The motions of the control elements (3, 5) of the control unit (1) manipulate...
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WO/1992/016397A1 |
The invention discloses a hydraulic aggregate for hydraulic control or regulating devices, in particular for braking pressure regulating devices in antilock braking systems or drive slip control systems for motor vehicles. To effectively...
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WO/1991/019108A1 |
The invention concerns a double-acting piston cylinder (10) in which the piston movements are transmitted by a displacement sensor (14) to an electronic control system (16). Acting on the piston rod (13A) is a mechanical brake (46). The ...
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WO/1991/018204A1 |
A hydraulic drive device, especially for robot arms with several joints, has as the power drive an axial-piston hydraulic motor (13) in which the pressure medium supply is controlled by a follow-up servo valve (14) and there is an electr...
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WO/1991/014103A1 |
A pneumatic or hydraulic piston-cylinder unit, for example the drive of a pneumatic or hydraulic straightening press, has a cylinder (1) containing a piston (3) connected to a press ram (7). The piston (3) divides the cylinder (1) into a...
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WO/1991/005957A1 |
A driving cylinder (16) has essentially a control magnet arrangement (17), a control valve (18) and a cylinder housing (19) with driving piston (20) that surrounds the control valve (18). The control magnet arrangement (17) has a stator ...
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WO/1990/013747A1 |
A hydraulic drive (10) for the adjustment, feed and return movements of a tool head of a machine tool comprises a hydraulic motor (11) and an after-running adjustment valve (12). The reference value of the position is set and the actual ...
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WO/1990/007063A1 |
A novel digital servo valve system (10) for use in displacing an actuator (22) is capable of operating either in closed or open loop mode. The system includes a controller (18) that compares computed values of actuator parameters with pr...
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WO/1989/003939A1 |
A linear drive comprises a hydraulic unit (1), a control valve (5) and an actuating drive (9) with an actuating member (7). These elements are interconnected by means of two inertia drive starters (4, 8), which results in a mechanically-...
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WO/1988/004734A1 |
A load sensing circuit of a load responsive directional control valve (10) includes devices for sensing load pressure signals, for identifying the load pressure signals as positive or negative, and for transmitting the identified signals...
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WO/1988/003652A1 |
A pair of loop antennas (40, 44) mounted internal to an extensible coaxial cavity (20) respectively transmit and receive electromagnetic signals in the radio frequency range exciting a transverse electromagnetic field in the cavity (20) ...
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WO/1988/001697A1 |
A hydraulic idling-regulating valve (10) comprises at least two mechanically operated through-flow valves (21, 22), which can be alternately controlled in a flow position and a closure position, said valves being both closed in a central...
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WO/1987/007686A1 |
Means for the position servo-control of a pneumatic cylinder (14) comprising a circuit (20) for the control of the cylinder supply distributor (10), and a position sensor (30) and an acceleration transducer (34) which are associated with...
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WO/1987/005669A1 |
A circuit (110, 129, 143, 145) for obtaining higher accuracy and total system response for complex mechanical impedance loads, such as earthquake simulators, and in particular to compensate for limitations in controlling the actual valve...
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WO/1987/004762A1 |
The fluid-powered actuator (12) has a piston (24) with unequal opposed surface areas (A1, A2). Main valve (11) controls fluid flow to or from at least one of the chambers (28, 29) when a load opposes the piston movement. A negative load ...
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WO/1986/006445A1 |
A servo-regulating circuit for a hydraulic forward drive unit (10), which operates with an electrically-controlled set value of the position and with mechanical feed-back of the actual position. The flows of the working medium to and fro...
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WO/1986/002901A1 |
An adjustment device comprises a control slide (13) proportionally adjusted as a function of the output signals from a comparator member (53). An integral regulator (56) cooperates to regulate the control slide (13) as a function of the ...
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WO/1986/002414A1 |
A system for monitoring the position of a machine component, whose drive is provided with an electrohydraulic drive system which, in order to control the forward and backward movements of this machine component, comprises a follow-up adj...
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WO/1985/005601A1 |
Le boîtier (10) d'un servofrein possède un col de boîtier (30) à partir duquel fait saillie axialement vers l'extérieur un prolongement tubulaire (8). A l'intérieur du boîtier (10) et de son prolongement tubulaire (80) sont dispos...
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WO/1985/003573A1 |
A load dynamic compensation circuit (70) for a servohydraulic control system for fixtures (10) and specimens (15) being tested operating in various degrees of freedom, for example in an environment to simulate earthquakes to test buildin...
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WO/1984/004784A1 |
A fluid servo actuator comprises an input member (30) which can be rotated by drive means (24), (25) and which is provided with tubes (52), (44) capable of supplying and discharging hydraulic fluid and grooves (53(a), 53(b), 53(c), 53(d)...
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WO/1984/001409A1 |
A pneumatic actuator which allows precise control as regard position, speed and acceleration. Piston (4) and cylinder (1) define a chamber (7) and inlet and exhaust valves (13 and 18) control the flow of gas into and out of the chamber u...
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WO/1982/004292A1 |
A shearing tool comprises a reference handle (10), a reference blade (14) rigidly connected to the reference handle (10), a control handle (12) and a slave blade (16) mounted at a common pivot assembly to the junction of the reference ha...
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WO/1982/000862A1 |
Hydraulic fluid powered actuation system for controlling the position of a control surface (162) of an aircraft in response to a plurality of redundant control signals. The system comprises a tandem actuator (10) adapted to be mounted in...
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WO/1981/002553A1 |
A hydraulic servo steering system (10) for vehicles has a steering valve (24) for directing fluid to steering cylinders (16, 17) in response to pilot fluid directed to one end of the steering valve (24) from a hand metering unit (31). A ...
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WO/1981/002185A1 |
An electrohydraulic set device including as an output set element a piston (26), which is operable by a hydraulic pressure against the action of return force. The hydraulic pressure is led to the working side of the piston via a valve pa...
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WO/1981/000893A1 |
A bidirectional, multiple speed hydraulic actuator, including a differential piston (10, 24, 26). First and second ports (28, 30) are respectively in fluid communication with opposite sides of the piston and there is provided a pressure ...
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WO/1981/000601A1 |
An electronic compensation circuit for a pneumatic load bearing bellows system closed on position, in which a servo valve provides pressure to the bellows to actuate the top of the bellows to move to a predetermined position in response ...
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JP7469131B2 |
To provide a flow passage switching mechanism 7 capable of easily identifying "auto" and "manual" states.The present invention relates to the flow passage switching mechanism 7 comprising a valve body 56 which is accommodated in a valve ...
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JP2024047991A |
An object of the present invention is to provide a cylinder device that can suppress deterioration in follow-up performance for a target thrust even if the throttling coefficient of a first variable throttle valve or a second variable th...
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JP2024047609A |
An object of the present invention is to provide a cylinder device that can suppress deterioration in follow-up performance for a target thrust even if the throttling coefficient of a first variable throttle valve or a second variable th...
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JP2024047362A |
An object of the present invention is to provide a cylinder device that can suppress deterioration in follow-up performance for a target thrust even if the throttling coefficient of a first variable throttle valve or a second variable th...
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