Matches 201 - 250 out of 310 < 1 2 3 4 5 6 7 >
Match Document Document Title
4629261 Centering and safety device for rotors supported without contact  
A safety and centering device for rotors suspended in contactless magnetic bearings, which provides almost instantaneous centering support for the rotor if the bearing magnets loose power. In a...
4628499 Linear servoactuator with integrated transformer position sensor  
A linear servoactuator including an integrated split-secondary differential transformer position sensor and a fluid driven linear actuator controlled by solenoid poppet valves. Signals from the...
4611755 Automobile air conditioner system with improved temperature control device  
A temperature control device used in an automobile air conditioner system includes a potentiometer for detecting the opening amount of an air-mix door. The potentiometer is tapped and includes at...
4595979 Positioning apparatus using a hydraulic actuator  
A positioning apparatus using a hydraulic actuator. For positioning an object to the desired position with high accuracy, the apparatus has means for computing the position at which the operation...
4588953 Microwave piston position location  
A microwave method and apparatus for detecting the position of a piston of a pneumatic cylinder. While the piston is being moved by fluid pressure a microwave signal is applied to a cavity defined...
4587883 High resolution control system for a pressure-responsive positioning device  
Two magnetic valves, one of which reduces the pressure and the other one of which increases the pressure by which the displacement of a positioning member is controlled, only one of them operated...
4585205 Fast opening valve apparatus  
A fast opening valve apparatus includes an electronic sensing circuit to determine when a positional error signal exceeds a predetermined reference value corresponding to an opening rate reference...
4574686 Digital proportional spool position control of compensated valves  
A digital proportional valve with valve spool driven in discrete steps by a digital spool actuator in response to a remote manual control signal, while the proportional valve may be provided with...
4549468 Hydraulic control device, particularly for power steering  
The slide (61) of an electrohydraulic valve (31) delimits two end chambers (57, 58) respectively fed by a control pressure that is a slave to the open or closed state of one of the two solenoid...
4539967 Duty ratio control method for solenoid control valve means  
A method of controlling the duty ratio of operation of a solenoid control valve in a fluid passage to control the flow rate of fluid in the fluid passage to a desired value. A flow rate value range...
4537547 Manipulator  
A remote handling manipulator having a slave arm and a manually operated controller with a grip mechanism, is provided with a force feedback system to impose a force resisting operation of the grip...
4531706 Pressure operated control installation  
A pressure operated control installation, especially for automotive vehicles, which includes a pressure source and a servo member controlled through a control block. The control block includes a...
4528894 Hydropneumatic drive apparatus  
An active pneumatic mechanism and a passive hydraulic mechanism of the apparatus are so connected with each other and with a driven member that movement imparted by the pneumatic mechanism to the...
4527954 Pumping apparatus  
A multiple-mode, multiplex pumping apparatus includes circuit control elements for initializing the apparatus by placing each of the pistons and plungers in each pumping section of the multiplex...
4513782 Electrohydraulic servovalve device  
A servovalve device assembly is provided with an electronic matching circuit positioned upstream of the servovalve. The matching circuit supplies electric control signals whose purpose is to modify...
4487107 Method of controlling revolution of drive shaft external combustion engine and Russin external combustion engine  
A method of controlling the revolution of the drive shaft of an external combustion engine comprises shaping a control signal for a switching member and converting said signal to mechanical...
4484443 Control system for superhigh pressure generation circuit  
A control system for a superhigh pressure generation circuit includes a hydraulic pump having a usual range of delivery pressure. An electrohydraulic servo valve controls the flow rate of...
4481768 Pneumatic control system for machines  
A pneumatic control system for machines that provides precise incremental or continuous direction, position, velocity and acceleration control of a variety of machine functions, such as rotary or...
4481451 Electronically controlled positioner for pneumatic actuators  
An electronically controlled apparatus for controllably positioning pneumatic actuators includes, in a first embodiment, first means for selectively flowing compressed fluid to the actuator and...
4460324 Shot cylinder controller for die casting machines and the like  
A shot cylinder controller for injection molding machines comprises a valve connected with one side of the shot cylinder and including a valve head which is movable with respect to a seat. The...
4445421 Helicopter swashplate controller  
A redundant swashplate control system includes five or more actuators coupled to the swashplate. A feedback network independently controls each actuator to track a commanded position and a...
4422474 Electro-hydraulic remote valve  
An application of the basic system of patent application Ser. No. 149,065 for operating a remote hydraulic valve. An electro-hydraulic actuator is mechanically linked to the control member of the...
4416187 On-off valve fluid governed servosystem  
In a pulse modulated servosystem having solenoid activated on-off valves governing the amount of fluid in two variable volume chambers of a double-acting piston-cylinder unit any limitation of the...
4386553 Control system for doser actuator  
A control system 54 for a doser type hydraulic actuator 56 is disclosed. The doser actuator includes a pair of unequal area pistons 18, 20 on a common shaft 16 which are moved incrementally by...
4370714 Electronically actuated brake system  
A pulse width modulated control signal is applied to inlet and outlet solenoid valves in a closed fluid vehicle brake system. The electronic actuating circuitry can control a fluid brake system in...
4358989 Device for reducing piston velocity in a cylinder  
To reduce the piston velocity in a cylinder as the piston approaches the end positions, a signal transmitter is provided for sensing the position of a part driven by means of the piston and...
4339076 Control system for automobile air conditioners  
A control system for an automobile air conditioner including an air blend door for adjusting the output of the air conditioner, a vacuum actuator including a hermetic chamber and a control member,...
4336745 Servovalve flow linearization circuit  
A linearization circuit for use with servovalves for controlling reciprocating actuators. The circuit will maintain a substantially linear flow as a function of spool position from the servovalve...
4328449 Device for controlling the speed of movement of a mobile member  
A device for controlling the speed of movement of a mobile member relative to a fixed support member, said mobile member receiving its motion from first drive means is described. The main feature...
4313364 Dual cylinder linear servo motor  
Servoactuator includes a pair of double-acting linear actuators providing for 360° controlled rotation of an output shaft. The rotary motion of the ouput shaft is employed to sequence high...
4301870 Device for electrohydraulically lifting agricultural implements  
A device for hydraulically lifting agricultural implements by a lifting jack, utilizing a pump with constant stroke volume and a stepless distributor. A flow pressure regulator of the pump is...
4294162 Force feel actuator fault detection with directional threshold  
In a system which provides feel-force to the control stick of an aircraft by means of hydraulic pressure, a fault indicating system which responds to excessive differences between desired and...
4279192 Electronic compensator for a pneumatic servo controlled load bearing bellows system  
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...
4265163 Fuel control system for internal combustion engines  
The amount of axial movement of a plunger is controlled by a hydraulic servomechanism. The pressure in the hydraulic chamber of the servomechanism is controlled by opening and closing an inlet...
4235155 Delaying control for hydraulic motors  
A delaying device for a fluid system for operating a hydraulic motor (10) wherein electrically operated pilot valves (39,40) are actuated by limit switches (13,13') in the motor to control flow...
4194434 Device for controlling a longitudinally movable driving means  
A device for controlling both the displacement of, and the transmittal of force by, a longitudinally movable driving apparatus comprising a piston rod which is hydraulically movable inside a...
4131325 Electrically controlled fluid brake system  
A vehicle braking system employs a fluid pressure operated device for engaging the brakes. Flow of liquid under pressure to this device is controlled by a solenoid inlet valve and escape of fluid...
4117765 Power servo control  
An electrohydraulic servo system to actuate the power shaft of a fuel control system from the cockpit throttle including electrical devices responsive to the position of the throttle that actuates...
4106390 Pneumatic linear actuator  
A digitally controllable pneumatic linear actuator in which a moving piston driven by compressed air is initially decelerated by the pressure of compressed air applied to the both sides thereof in...
4102248 Protective system for pneumatically operated devices  
This disclosure relates to a system for protecting pneumatic cylinders and diaphragm valves against failure of both electrical and pneumatic supplies. In the event of a failure of the air supply,...
4089494 Reduced servo noise control for a hydraulic actuator  
In a hydraulic actuator such as those used in multiple degree freedom motion bases for aircraft simulators, a secondary force sensitive hydraulic servo loop is added in parallel to the primary...
4077738 Time modulated position controller  
A time modulated position controller is provided comprising a hydraulic actuator having a cylinder and a piston slidably disposed in the cylinder thus defining a chamber within the cylinder. An...
4075930 Pneumatic actuator system and method  
A system for precisely positioning a linearly movable output member incorporates an improved nonexpansion, bi-directional vane motor whose internal gas carrying chamber is configured to prevent...
4038907 Stroke limiting mechanism with fail-safe feature  
A stroke limiting mechanism is connected with the movable member of a hydraulically operated machine to precisely position the movable member. The flow circuit for the stroke limiting mechanism is...
4037519 Hydraulic system  
An electro hydraulic system for controlling a hydraulic function includes a pump and a reservoir connected to the function through a manually operable, electro-hydraulic control valve. The valve is...
4016803 Servo device  
The invention relates to a servo assembly having a stationary part including a housing, a movable member and a servo motor. Of primary interest is the stopping mechanism which includes a stop unit...
4015729 Automatic control system for backhoe  
An automatic control system for a backhoe utilizing a bucket at the end of a rigid boom is disclosed herein. The automatic control system includes an actuator cooperating with a control valve that...
3970830 Computer controlled machine tool contouring system  
A computer controlled machine tool contouring system having a cutting element which is positioned relative to a workpiece support table. An actuating means controls the workpiece support table to...
3968730 Method of and apparatus for synchronizing a plurality of fluid-operated rams  
A plurality of fluid-operated rams, e.g., for positioning the rolls of a sheet-metal bending machine, are each actuated by a respective servovalve and are each connected to a respective...
3954046 Valve arrangement for controlling a reversible hydraulically operated device  
The valve arrangement includes four main control valves connected in a bridge circuit connected, at one end of a first diagonal, to a source of fluid under pressure and, at the other end of the...
Matches 201 - 250 out of 310 < 1 2 3 4 5 6 7 >