Matches 151 - 200 out of 310 < 1 2 3 4 5 6 7 >
Match Document Document Title
4991491 Circuit arrangement for position and feed control of a hydraulic cylinder  
The object of the invention is to improve the position and feed or advance regulation of a hydraulic drive which is controlled by a proportional valve. In a first compensation circuit the flow...
4987823 Location of piston position using radio frequency waves  
An electrohydraulic control system includes an actuator having a cylinder and a piston variably positionable therewithin. An electrohydaulic valve is responsive to valve control signals for...
4984505 Multiplexed hydraulic control systems  
A time division multiplexed (TDM) hydraulic control system having a plurality of channels, each channel having a servo actuator. Electrical demand signals are arranged in TDM sequence and applied...
4966065 Multiplexed hydraulic control systems  
A time multiplexed hydraulic control system in which a multiple section dog valve is multiplexed among a plurality of channels. An electrical actuator on the dog valve controls pilot means. The...
4938118 Control valve  
A 3/2 proportional control valve is provided with an actuating piston which is subjected to the control pressure set in a pilot valve. The area relationships of the actuating piston are so chosen...
4932311 Fluid apparatus  
A fluid apparatus includes a pneumatic cylinder having a main body, a piston, and a hollow rod. A ball screw shaft engaged with a ball nut fixed to the piston is rotatably and axially unmovably...
4930402 Hydraulic lifting cylinder-piston unit  
A hydraulic cylinder-piston unit comprises primary cylinder-piston unit with an integrated position regulation and with a primary cylinder and a primary piston movable in the primary cylinder, two...
4915281 Arrangement for a method of converting a stepwise translation movement into a continuous translation movement  
For converting a stepwise translation movement into a continuous translation movement and arrangement and a method is provided which have at least two fluid-operated cylinder-piston units with...
4913032 Multiplexed hydraulic control systems  
A time division multiplexed (TDM) hydraulic control system having a plurality of channels, each channel having a servo actuator. Electrical demand signals are arranged in TDM sequence and applied...
4909060 Oil compression compensation system  
A pre-set fluid actuator for setting the roll gap of a rolling mill having a transducer for detecting actuator movement and an electrohydraulic servovalve for controlling its position, a control...
4907493 Valve control system for hitch motor  
A system for the control of a fluid flow control valve which controls the supply of fluid to an actuator to control the movement of a component such as a tractor implement hitch in response to a...
4901625 Apparatus and method for positioning equipment  
A system for positioning equipment quickly and accurately over a plurality of desired positions by employing a "long move" mode of operation and a "short move" mode of operation to adapt the...
4899637 Oscilatory hydraulic actuators with internal supply, return, and control passageways for multi-axis wrist actuator  
A rotary actuator includes a shaft rotatably mounted on a body, and a servovalve arranged to operate a vane motor for selectively rotating the shaft relative to the body. A portion of the shaft...
4896582 Method for reducing the piston speed, especially in the piston and cylinder assemblies of an excavating machine, and device for carrying out the method  
The invention relates to a method and a device for reducing the piston speed in a piston and cylinder assembly (1), as the piston approaches the end position. The piston end position is sensed, and...
4887511 Hydraulic control valve apparatus  
A hydraulic operating apparatus for a circuit interrupter comprises a conversion unit for converting input information from the exterior concerning a speed control pattern into an electrical signal...
4876531 Position detector for the movable element of a fluid-operated actuator  
A device for detecting the position of a movable element of an adjusting member operated by fluid pressure. A cylindrical probe is introduced into the wall of the actuator and extends to near the...
4870892 Control means for a hydraulic servomotor  
A control system for a two way acting hydraulic servomotor wherein the servomotor is connected in the diagonal of a bridge circuit that includes four magnetic valves with a pair of the valves being...
4863337 Control system for working machine having boom  
A control system for a working machine which has a boom equipped with a working implement at its forward end and pivoted to a vehicle body movably about a vertical axis, and control valve for...
4852657 Apparatus for selectively positioning movable work element with preselected maximum velocity control  
Agricultural vehicles have heretofore lacked an adaptive implement hitch control and have correspondingly suffered from poor controllability of the hitch when the mass of the implement is varied...
4842162 Apparatus and method for dispensing fluid materials using position-dependent velocity feedback  
Apparatus and method for dispensing fluid materials wherein the fluid is discharged from a nozzle at a rate controlled by a metering valve having a seat and a stem moveable with respect to the seat...
4817499 Tractor hitch control system  
An electronic tractor hitch control system in which the position of an implement hitch relative to a tractor can be set using a main control operable by a tractor operator from his normal location...
4817498 Dynamic characteristic compensating device for electrical hydraulic servo actuator  
In a dynamic characteristic compensating device for an electrical hydraulic servo actuator, a differential pressure detecting piston is displaced in proportion to the difference in pressure between...
4813335 Hydraulic actuator for automobiles  
A hydraulic actuator for automobiles includes a hydraulic actuator body composed of a hydraulic cylinder and a plurality of solenoid valves, and an electric control circuit disposed adjacent to the...
4807518 Counterbalance mechanism for vertically movable means  
A spindle carrier, which is movable vertically by an electric servo motor through a relatively long ball screw, has a substantially constant counterbalance force maintained on it irrespective of...
4800798 Control surface dual redundant servomechanism  
A dual redundant servomechanism for moving aircraft control surfaces is disclosed. The servomechanism is of the type whose input commands, from the pilot of the aircraft, are transmitted...
4796428 Double-acting forging hammer and method  
A double-acting accelerated forging hammer and method of operation are disclosed. The hammer is of the type having a vertically oriented cylinder, a piston slidably mounted within the cylinder...
4794841 Pneumatic drive mechanism for positioning apparatus  
A pneumatic drive mechanism for use with positioning apparatus or the like, having a drive housing, a drive element such as diaphragm disk, piston or the like, movably seated therein and rigidly...
4790233 Method and apparatus for controlling hydraulic systems  
A control system is provided for a hydraulic actuating system having a multi-phase stepping motor with a driver therefor which supplies and controls DC current through each of the motor windings...
4773302 Control apparatus and proportional solenoid valve control circuit for boom-equipped working implement  
A control apparatus having a boom control system for controlling the movement of a liftable boom supported by a vehicle body and a working device control system for controlling a working device...
4763560 Method and apparatus of controlling and positioning fluid actuator  
Method and apparatus of controlling and positioning a fluid actuator by supplying pressurized fluid to right and left actuating chambers of the actuator through an on-off control valves. To drive...
4759183 Control arrangement for at least two hydraulic loads fed by at least one pump  
A pump supplies via in each case a directional valve with associated pressure balance fluid or pressure medium to a plurality of loads. When the pump power is not sufficient a proportional quantity...
4757745 Microwave antenna and dielectric property change frequency compensation system in electrohydraulic servo with piston position control  
An electrohydraulic servo system which includes an actuator having a cylinder and a piston variably positioned therewithin, a servo valve responsive to valve control signals for coupling the...
4757746 Method of and apparatus for control of a force applied to or the position assumed by a work effecting element  
A control for a press for controlling the flow of fluid to two hydraulic actuators which applies a desired working force to or which positions the press platen in a desired position including a...
4756229 Digital motor feedback for a position actuator  
A linear actuator (42) includes a housing (44), and a linearly displaceable piston (46) having a shaft (48) with a gradated position scale (60) and a gradated direction scale (62) disposed by ion...
4747335 Load sensing circuit of load compensated direction control valve  
A load sensing circuit of a load responsive direction control valve including a device for sensing load pressure signals identifying those load pressure signals as positive or negative and...
4741247 Pneumatic actuator apparatus  
The apparatus disclosed herein provides controlled operation of a pneumatic actuator by effecting charging and discharging of the actuator through an intermediate step volume, the pressure in the...
4726187 Circuit arrangement for controlling the speed of rotation of a hydrostatic machine  
A control for the speed of rotation of a hydrostatic machine in which the controlled variable and generated in a speed controller and is made up of a proportional component and an integrating...
4723474 Pneumatic stepping actuator positioner  
A pneumatic control system for a reversible stepping actuator has an analog pneumatic control signal and an analog signal indicative of actual position of the actuator. Imbalance in these signals...
4714005 Power transmission  
A system and method for remotely measuring and linearizing flow characteristics, specifically velocity characteristics, of an electrohydraulic servo valve and actuator system. A plurality of raw...
4712470 Method and apparatus for compensating the variable weight of a mass acting on a hydraulic drive, in particular for the upright drive cylinder of a lapping machine  
A tool, in particular a lapping wheel, is to be positioned by a hydraulic drive cylinder and subsequently pressed against a workpiece. For this purpose a position control and a pressure or force...
4712173 Multicontrol process control system  
The present invention uses an input multiplexer for selecting a plurality of input signals, a fluid multiplexer for selectively delivering a control output to a plurality of devices to be...
4687179 Automatic valve actuator and control system  
A valve actuator control system, although suitable for many control functions, is especially adapted for remote control of plug-type valves utilizes a unique configuration providing a unitary...
4679490 Oscillator reciprocation control system for piston motor  
An external combustion engine comprises an actuating cylinder in which a piston with rod is mounted for reciprocation, said piston serving as the actuating member, a valve distributor serving as...
4679489 Automatic leveling system for blast hole drills and the like  
A dual automatic leveling system for a blast hole drill during raising and lowering which includes "fine" level sensors to detect an attitude within a fine level range and "coarse" level sensors to...
4671166 Electro-hydraulic actuator systems  
An electrohydraulic actuator system has a first pair of actuators and a control circuit and a control valve for each actuator. The control circuits generate actuator position error signals and are...
4669359 Positioning system  
A system for positioning a movable body for a processing machine. A lead screw is rotatably and axially shiftably supported and engaged with the movable body. The lead screw is rotated by a motor...
4666374 Methods and apparatus for producing uniform discharge and suction flow rates  
A pumping system for producing uniform discharge and suction rates includes a pump connected to a supply of hydraulic fluid to deliver hydraulic control fluid at a selectable flow rate to a...
4651547 Process for adjusting the thickness and profile of a flat product in the course of rolling  
At an installation comprising a roll stand having at least one roll of the variable camber type, comprising a fixed support and a casing carried by at least three jacks and rotationally movable...
4651621 Control system for an air motor  
A control system (10) for supplying an operational chamber (38) in an air motor with pressurized fluid causing rotors (18 and 20) therein to move and develop an output torque in response to an...
4646620 Automatic depth control system  
An automatic depth control system is disclosed. The system includes a floating piston hydraulic cylinder in which the floating piston is adjusted as a stop for limiting the travel of the main...
Matches 151 - 200 out of 310 < 1 2 3 4 5 6 7 >