Abstract: A joint device with an upper part and a lower part which are mounted on each other so as to be pivotable about a pivot axis, a hydraulic unit secured on the upper part and the lower part, and a housing in which a cylinder is arranged. A working piston is arranged in the cylinder and is coupled to at least one spring mechanism which transmits tensile forces and compressive forces and which engages on at least one abutment arranged displaceably inside the cylinder.

Abstract: A system and method of performing maintenance on a wing cock valve coupled to a pressurized gas delivery pipe is provided. The method removing a plug from a port on the valve. A threaded portion of a grease tool is coupled to the port, the grease tool having a body coupled to the threaded portion and a fitting on an opposite end, the fitting, body and threaded portion defining a flow path. A hose is coupled on a grease gun to the fitting; and actuating the grease gun to flow a grease from a reservoir through the flow path and into the valve.

Abstract: A pneumatic engine for metering or controlling of flow of compressed gas. is disclosed. In certain embodiments, the flow may be used to sound a whistle. The engine may include a body comprising a first chamber having an exit aperture, a second chamber having an entrance aperture, and a bolt aperture connecting the first chamber to the second chamber. A bolt may be positioned within the bolt aperture and extending into the first chamber and into the second chamber. The bolt may comprise a conduit extending therewithin. The conduit may place the first chamber in fluid communication with the second chamber. The bolt may selectively travel within the body through a range of motion. The range of motion may comprise a first position wherein the bolt blocks the exit aperture and a second position wherein the bolt does not block the exit aperture.

Abstract: A fluid pressure operated actuator device, comprising: a body defining a first chamber (2) comprising an inlet in fluid communication with a pressurized fluid source (1); and a moveable element (5) mounted in the first chamber, the moveable element comprising an operative end (4) and partition means (3) configured to separate a first region of the first chamber comprising the inlet from a second region of the first chamber opposed to the first region during use of the device, the moveable element being moveable relative to the body between an extended configuration and a retracted configuration, with movement from the retracted configuration to the extended configuration occurring in response to a pressure differential across the partition means, wherein the actuator device includes a first passageway (7) for allowing passage of fluid from the pressurized fluid source to a second chamber (9) in the operative end of the moveable element, and a second passageway (8) for allowing passage of fluid from the second

Abstract: Embodiments of a valve actuator are provided for adjusting the position of a main valve element in relation to the pressure of a fluid supplied by a supply duct. The valve actuator includes a housing, a control pressure valve disposed in the housing, and a piston slidably disposed in the housing and mechanically coupled to the main valve element. The housing has a control pressure chamber therein, which is configured to be fluidly coupled to the supply duct. The control pressure valve is configured to substantially impede fluid flow into the control pressure chamber until the fluid pressure within the supply duct surpasses a minimum actuation pressure. The piston normally resides in a first position and is configured to move toward a second position as the pressure within the control pressure chamber increases.

Abstract: An electrohydraulic booster comprises an electromechanical transducer and a hydromechanical power stage which is connected to a pressurized medium supply and encompasses a cylinder and a piston that can be moved therein along the working axis. The electromechanical transducer acts on a spool valve which is associated with the hydromechanical power stage, is disposed at least in part inside the piston, is guided within a guiding bore in such a way as to be movable along the working axis, and has two first leading edges that cooperate with corresponding second leading edges located on the guiding bore in order to form a hydraulic sequential control. The guiding bore consists of two parts, i.e. a cylinder-mounted first section and a second section which can be moved along the working axis and comprises the second leading edges.

Abstract: An air balance structure that compensates for the weight load of a movable member driven in a straight line along the vertical axis, with a simplified structure and at reduced cost. The box-shaped movable member has an open bottom that accommodates the stationary member therewithin, in which state the movable member is movably supported in the vertical direction by an air bearing created using a gap between the stationary member and the movable member. An air balance chamber that contains pressurized air is formed inside the movable member. After pressure-adjusted air is supplied from the outside to the gap from a jet port through a pipe inside the stationary member, the air flows into the air balance chamber. This flow seals the pressurized air inside the air balance chamber. Pressurized air exhaust is exhausted externally from an exhaust port through a pipe and a flow adjusting device.

Abstract: A valve arrangement for controlling the flow of pressurized fluid between a working chamber and an outlet chamber that passes between a seal and a seat surrounding an orifice to the outlet chamber. Fluid flowing through the orifice produces a first turbulence produces a broad band sound that is within an acceptable audible level. An actuation force applied to an input rod after overcoming a force of a return spring moves the seal toward the seat to restrict the flow of fluid from the working chamber through the orifice. The restriction in the flow of fluid through the orifice produces a second turbulence in the fluid that is communicated to the outlet chamber. The seal has an annular ring that extends into the orifice to divert the flow of fluid having the second turbulence away from the return spring to attenuate the development of a reaction in the return spring that would significantly add to the broad band sound.

Abstract: A paint shaker and motor therefor. A yoke has at a first end a clamp for clamping a paint can and at a second end, is pivotally connected to a linkage assembly that converts the linear motion of a reciprocating linear motor to an arcing motion of the yoke. The motor includes a cylinder and a piston that is spring biased toward an inlet end of the cylinder. Compressed air enters the inlet end and a passageway through the piston for conducting the compressed air to a valve having a displaceable stopper, wherein the compressed air seats the stopper in the valve and thereby closes the valve, so that air pressure moves the piston toward an outlet end of the cylinder. The outlet end of the cylinder includes a projection against which the piston drives the stopper so as to unseat the stopper in the valve and thereby open the valve, permitting the spring bias to return the piston toward the inlet end of the cylinder.

Abstract: A fluid power apparatus having a housing with a bore therein which is divided by a power piston into an inlet chamber and an outlet chamber. The power piston has a passageway for connecting the inlet chamber with an outlet chamber. A valve arrangement controls the flow of a fluid under pressure from a source through the passageway. The valve arrangement including a valve seal, a valve spring and an input rod. The valve spring urges the valve seal into engagement with the input rod to define a working chamber within said passageway. The fluid under pressure flows from the inlet chamber to the outlet chamber by passing between the valve seal and a valve seat located in the working chamber. The flowing of fluid past the valve seat in a rest mode of operation develops a turbulence which creates a broad band non-resonance sound having an acceptable audible level of approximately 30 dB.

Abstract: A diaphragm assembly for movement in response to a pressure increase exerted thereon comprised of a resilient flexible diaphragm having a first surface with a predetermined profile when said diaphragm is in a neutral, unflexed condition, the diaphragm having an opening formed therethrough.A rigid pressure plate is adapted to be positioned against the diaphragm. The plate has a contoured surface for mating engagement with the first surface of the diaphragm. The contoured surface has a recessed sealing surface dimensioned to form an open space between the plate and the diaphragm when the diaphragm is in the neutral, unflexed condition, and to enable the diaphragm to flex into sealing engagement therewith when sufficient pressure is exerted on said diaphragm. A first vent passage communicates the opening in diaphragm with the open space, and a second vent passage communicates the open space with the edge of the pressure plate.

Abstract: A ramming apparatus having a shortened length without sacrificing ramming power requirements is disclosed comprising a housing having a front end and a rear end, a pneumatically driven percussion piston having a front end and a rear end operatively mounted in the housing for oscillating movement between the front end and the rear end of the housing, a front pressure chamber provided in the front end of the housing, a rear pressure chamber provided in the rear end of the housing, a high pressure air supply line, a control device for controlling the application of pneumatic pressure on the percussion piston, the control device having a control piston extending axially from the rear end of the percussion piston into an opening of an end piece of the housing and having at least one radial control channel that is closable by the end piece, and an axial channel provided in the percussion piston, wherein when the percussion piston is in a forward position the axial channel communicates with the radial control channe

Abstract: A hydraulic ram includes a water inlet conduit, a draining conduit with a main clapper valve and a bell or cup valve. The bell or cup valve communicates with the chamber through a plurality of individual clapper arranged parallel to one another. Each of the individual clapper valves block one passage orifice. The bell or cup valve has a water backflow outlet connection. The individual clapper valves include spheres of resilient material located adjacent seats arranged in a wall separating the chamber from the bell or cup valve. The wall includes separating barriers and a perforated back-up plate. The draining conduit is arranged vertically under the chamber. The main clapper defines a vertical axis extending into the chamber and is mounted slidably in a stationary bearing, while being pulled back constantly and elastically into a top open position of the main clapper valve. The main clapper valves also includes an element serving as a shock absorber for an end of a downstroke.

Abstract: A pressure washing system is disclosed which consists of a hydraulic pump driven by a variable speed internal combustion engine, a nozzle gun connected to the pump outlet, an unloader valve that senses the demand state of the nozzle gun for delivering water under pressure to the gun on demand, and for recirculating water to the pump inlet when the gun is in a non-demand position, and a throttle control device. The throttle control device senses pump outlet pressure and controls engine speed as a function of the demand/non-demand mode of the nozzle gun. Water is accordingly delivered at a high flow rate to the nozzle gun in the demand state, but recirculated at a much lower flow rate when the nozzle gun is in a demand state. The throttle control device also senses fluid pressure from the pump outlet to operate between engine starting and engine running modes.

Abstract: A hydraulic actuator system, for use in an aircraft, and in which the servo fluid supply to the system is used to provide for the operation and cooling of the system. The system comprises a hydraulically operated piston mechanism including at least one hydraulically operated piston, a servo vluid input to the system, which is connected in a ring main to a first side of the hydraulically operated piston, a servo fluid output from the system, which is connected in a ring main to a second side of the hydraulically operated piston, a variable restrictor arrangement which provides an interface between the servo fluid input ring main and the servo fluid output ring main, and a restrictor arrangement positioned in the servo fluid output side of the system. The position of the piston of the hydraulic piston and the adjustment thereof, are controlled by the restriction applied on the system by the variable restrictor arrangement.

Abstract: A hydraulic differential cylinder comprises a cylinder, a piston slidably fitted in a cylinder chamber, a piston rod with one end coupled to said piston and an inner valve disposed in said piston rod. The cylinder chamber is divided by the piston into a rod-side cylinder chamber and a head-side cylinder chamber. The piston-pressure-bearing area of the head-side cylinder chamber is greater than the piston-pressure-bearing area of the rod-side cylinder chamber. The rod-side cylinder chamber is connected via the inner valve to a constant hydraulic pressure source. The head-side cylinder chamber is connected to a control hydraulic pressure source.

Abstract: A multi-ram forging assembly has a piston-cylinder unit for driving each ram carrying a forging tool wherein at least two diametrically opposed forging unit simultaneously act on a workpiece. Each piston-cylinder unit comprises a pressurized inlet chamber for containing a hydraulic pressure fluid at a predetermined pressure behind a piston movably disposed in the cylinder. The piston includes a front-end ram carrying a forging tool. A valve including a valve seat member is disposed on the piston at a rear side opposite to the front-end ram. A valve cone cooperates with the valve seat member to provide a closed position and an open position for the valve. An actuator is connected to move the valve cone between the closed and open positions. The piston includes a passage bore extending from the valve seat member to a pressure fluid discharge chamber connected to a hydraulic pressure fluid reservoir container providing a pressureless discharge of the pressure fluid medium.

Abstract: A piston is moveably arranged in a cylindrical bore of a housing and the piston rod extends through one end of the housing for connection to a unit to be controlled. A very high variable control rate of the piston is made possible by a control slide valve formed as a hollow cylinder that is moveable within a coaxial bore of the piston rod. The hollow, cylindrical, control slide valve contains a plurality of apertures that cooperate with ports formed in the piston rod that extends on either side of the piston. A chamber formed on one side of the piston is connected to a source of pressurized fluid and a chamber at the other side of the piston is connected to a return for such pressurized fluid. A control rod is connected to the control slide valve for moving same within the coaxial bore of the piston rod and by specially forming the guiding or leading edges of the apertures formed in the control slide valve, high variable control rates are possible.

Abstract: A hydraulic device includes a piston slidable within a cylinder. Fluid under pressure is admitted to one end of the cylinder through an inlet which contains a restrictor. The piston is formed with an orifice and is biased by a first spring towards the one end of the cylinder. A thrust rod is engageable by the piston to transmit the movement of the piston to an external mechanism. When the piston is moved by rising fluid pressure the orifice is closed by the end of the thrust rod so that a higher value of fluid pressure is required to effect the initial movement of the piston than is required to allow the return movement of the piston.

Abstract: A cylindrical casing accommodates an operator pistion and a power piston separated by a fixed barrier which serves to define with the former a reservoir and with the latter a power chamber. A piston rod affixed to the operator piston extends through the barrier into manual brake actuating relation with the power piston. Hydraulic fluid under pressure is introduced to the reservoir from which it flows through barrier passages, past a check valve, into the power chamber and out through venting ports formed in the piston rod. To apply vehicle brakes linked to the power piston, the operator piston is manually propelled toward the barrier, and the power piston is thus forced away from the barrier by the piston rod, resulting in rapid transfer of hydraulic fluid from the reservoir to the power chamber. The venting ports then close, such that the power chamber is pressurized to exert a brake power assisting hydrostatic force on the power piston.

Abstract: The present invention relates to a motor control circuit for a stepper motor which causes a motor shaft to oscillate between an incremental rotational position nearest above and nearest below a commanded average rotational position identified by an electrical command signal. A clock is provided for sending periodic clock signal pulses to the control circuit. An up/down counter is connected to the clock for counting clock pulses on each clock cycle and for providing an output signal in the form of a binary representation of total clock pulses. A comparing circuit electrically connected to the up/down counter is used to control an up/down direction of the up/down counter before each clock signal pulse so that the up/down counter causes the motor shaft to rotate to a position nearest beyond the commanded shaft position and to thereafter oscillate between an incremental count nearest above and an incremental count nearest below the commanded average rotational position.

Abstract: This invention pertains to a pneumatic mode under which the structure of a hydraulic system is driven, particularly denoting the pneumatic mode under which a mini air compressor is being used as a means to elevate a hydraulic jack.This invention makes use of a working lever and a working body attached to the hydraulic mechanism which is compactly closed inside a body to drive the hydraulic lever of the hydraulic mechanism which is compactly closed at the other end of the body to conduct a continuous backward/forward movement which will press against and elevate the hydraulic jack. Such a movement is similar to a continuous backward/forward movement conducted by a piston in a cylinder body. However, the entire structure and effected of this invention is found much better because of its easy fabrication and its function of elevating the hydraulic jack by means of a pneumatic mode, which saves both time and strength and thus meet the requirement of a simple and automatic operation.

Abstract: A jack with drain valve including a housing having a first cylinder and a first piston; the first piston defining a second cylinder into which a second piston is reciprocally mounted. A drainage tube is defined by the first piston, the drainage tube extending between the second cylinder and the bottom, workpiece engaging surface of the piston. When both first and second piston engage a workpiece, hydraulic fluid may be forced through an inlet port into the first cylinder, placing pressure against both first and second pistons in their engagement with the workpiece; the drainage tube being obstructed by the second piston. Once the workpiece is moved or the jack retracted, pressure on the hydraulic fluid in the first cylinder, which may be applied by upward pressure on the first piston, forces the second piston downwardly beyond the inlet port of the drainage tube. In this manner the cylinders may be readily drained for reuse of the jack.

Abstract: A vacuum responsive switch for detecting a failure in creation of a control vacuum within the control diaphragm chamber. A solenoid valve is provided which functions to equalize pressure within one of a power diaphragm chamber and a leak chamber with the other when vacuum represented by a signal from the vacuum responsive switch is lower than a predetermined value.

Abstract: A servo booster mechanism (18) having a piston (48) responsive to movement of a plunger (84) by an input signal for controlling the rate of fluid flow past a seat (82) into a passage (80) for distribution to the surrounding environment. A first restrictor (75) creates a first pressure drop in a supply fluid pressure P.sub.s to present an operational chamber (46) with fluid at a pressure P.sub.x. A second restrictor (openings 74-76) creates a second pressure drop in fluid pressure P.sub.x supplied from the operational chamber (46) to present control chamber (88) with fluid at a pressure P.sub.h. The difference in pressures combine to act on the piston (48) and plunger (84) to provide a constant force at stem (26), which provides a feedback to the input member (12), and provide a linkage (22) with a force to hold a position sensor (24) in a stationary position.

Abstract: This invention relates to an automatic temperature control system for automobiles and improved components thereof. The control system operates on the proportional stroke principle and comprises an in-car air sensing tube biased with ambient air; a sensor in an aspirator at the end of the tube; a moving pivot operated directly by the output of the sensor; and a feedback valve operated by the moving pivot for driving a vacuum-assist motor, the output stroke of which operates the various electrical and vacuum functions of the heater-air conditioning system.

Abstract: An idle control valve (10) for adjusting the idle position of a vehicle throttle lever includes a housing (12) having a pair of diaphragm assemblies (18, 20) which divide the housing into three chambers (22, 24, 26). The chamber (26) defined between the diaphragm assemblies is communicated with atmospheric pressure, and the other chambers (22, 24) are communicated with engine manifold vacuum. A valve member (38) controls communication through a vent (74) in the diaphragm assembly (20) to position the latter as a function of the variations in engine manifold vacuum to thereby control the position of the plunger (62) which is attached to the diaphragm assembly (20). The diaphragm assemblies (18, 20) include projecting portions (36, 52) which telescope within one another when the vehicle engine is turned off and atmospheric pressure is communicated to all three chambers to permit the plunger to be withdrawn into the housing.

Abstract: A hydraulic system in which pressurized fluid fed from a hydraulic pump is distributed through a distributor valve, on one part to a hydraulic booster for a brake and on the other part to a power steering unit or other hydraulic device. The distributor valve has a spool valve slidably fitted in a casing, the spool being displaced according to a fluid pressure differential acting at opposite ends thereof to increase the discharge pressure of the hydraulic pump in response to an increase in the fluid pressure at a first outlet port of the casing leading to the hydraulic booster or in the fluid pressure at a second outlet port leading to the power steering unit. Upon application of brake, a fluid passage which drains the first outlet port through a power piston is closed by movement of an input piston which is associated with a brake pedal, thereby slidingly displacing a valve piston.

Abstract: A hydraulic force multiplying device comprising a main body having inlet and outlet ports, input and output rods with one ends thereof being slidably connected with one another in the main body, an annular piston slidably engaging with the inner circumference of the main body and the outer circumference of the input rod and being associated with the output rod, two liquid chambers partitioned by the piston and connected respectively to the inlet and outlet ports, a connecting passage connecting the two liquid chambers, a valve mechanism provided between the input rod and the output rod for controlling the liquid flow passing through the connecting passage, and a by-pass passage provided between the piston and the input rod for connecting the two liquid chambers in the non-actuated condition of the device.

Abstract: A hydraulic force multiplying device has a housing having an inlet port connected to a source of hydraulic pressure and an outlet port, an input rod and an output rod, one end of each of the input and output rod being slidably connected with one another within the housing, a free piston slidably disposed between the outer circumference of the input rod and the inner wall of the housing and dividing the interior of the housing into an inlet side oil chamber and an outlet side oil chamber, the free piston being associated with the output rod, a passage formed in the input rod for connecting the two oil chambers, and a valve for controlling oil flow in the passage. The valve consists of a valve member and a valve seat provided respectively on either the input or the output rod and the other of the input and output rods. The valve is formed to allow the relative movement between the input and output rods in the valve closing direction with the valve member engaging with the valve seat.

Abstract: A vibration damping mechanism for a hydraulic booster including a manually operated pedal which includes a hydraulic booster body, a control valve mechanism disposed within the body, an input member slidably disposed within the body and operably connected to the control valve mechanism disposed within the body and first and second push rods positioned in tandem for operably connecting the input member to the manually operated pedal, the first and second push rods being bendably connected to each other at each end thereof with each end of the push rods being in eccentric arrangement relative to the input member such that radial movement of each end of the push rod is limited by the input member.

Abstract: A hydraulic booster including a housing provided with an inlet hydraulically connected to a pump, a drain port hydraulically connected to a reservoir and a cylindrical bore, a power piston sealingly and slidably disposed within the bore and dividing the cylindrical bore into a working chamber and a drain chamber which is in normal communication with the drain port, an input member sealingly and slidably passed through a first end wall of the bore, the input member having an inner end sealingly and slidably interposed within the power piston and a valve seat formed on the inner end fact thereof, an output member sealingly and slidably passed through a second end wall of the bore and connected to the power piston at an inner end of the power piston the output member provided therein with a passage communicating with the inlet, a poppet valve member sealingly and slidably disposed within the power piston and cooperable with the valve seat for controlling hydraulic communication between the working chamber and th

Abstract: A hydraulic power brake system in which a hydraulic power brake booster has one or more back pressure control valves to produce a restriction downstream of the booster control valve after the booster has been actuated to build up some booster power pressure. This back pressure on the booster control valve is effective to control hydraulic valve noise during booster operation. There is substantially no fluid restriction in the booster when the booster is not actuated. Three back pressure control valve arrangements are disclosed.

Abstract: In order to reduce the distortion of a servo booster bousing in use the booster is provided with one or more ties which extend through the movable wall for transmitting reaction forces directly from the master cylinder housing to the vehicle bulkhead. This enables a housing of lighter weight to be employed, and an overall saving in weight to be achieved. A diaphragm support plate of the movable wall is sealed to the tie by a rolling diaphragm, and the support plate is provided with a tubular extension co-axial with the tie.

Abstract: A hydraulic power booster system in which a hydraulic power brake booster has hydraulic ratio changing mechanisms. The ratio is established by trapping hydraulic fluid in a chamber with an input piston having a larger effective area than an output piston forming movable chamber walls. A ratio piston or sleeve exposed to booster power pressure and the trapped pressure is moved upon power runout, causing the booster ratio to change as the ratio of these pressures change, providing a smooth transition from a high ratio toward a 1:1 ratio as the booster shifts to manual operation from hydraulic power operation. These are three booster modifications shown.

Abstract: A rotary to linear servo mechanism for converting low force mechanical rotary motion into hydraulic motion is provided which includes a piston linearly movable in one end of a bore and a valve rotatably mounted in the other end of the bore for cooperation with the piston to selectively deliver pressure fluid to opposite sides of the piston to move said piston selectively in either direction in said bore.

Abstract: A hydraulic power booster system in which a hydraulic power brake booster has a hydraulic ratio changing mechanism. The ratio is established by trapping hydraulic fluid in a chamber with an input piston having a larger effective area than an output piston forming movable chamber walls. A ratio piston or sleeve exposed to booster power pressure and the trapped pressure is moved upon power runout, causing the booster ratio to change as the ratio of these pressures change, providing a smooth transition from a high ratio toward a 1:1 ratio as the booster shifts to manual operation from hydraulic power operation. A valve which operates to trap pressure in the chamber upon booster actuation also provides a vent path from the chamber when the booster is fully released so that any air in the chamber may be bled out.

Abstract: A hydraulic power brake system in which a hydraulic power brake booster has an accumulator operable when there is insufficient power to operate the power brake with hydraulic pressure. The accumulator control valve is actuated by a cylindrical cam normally radially displaced so that its axis is not coincident with the axis of the booster. Sufficient actuating movement of the control portions of the booster cause the cam to move axially and radially so that its axis moves in a direction to be coincident with the axis of the booster, causing the accumulator control valve to be opened in a controlled manner and admit accumulator pressure to the booster power chamber.

Abstract: A hydraulic servo-actuator has a casing embracing therein a hydraulic fluid chamber which is divided into two hydraulic drive chambers by a vane projecting from a first shaft. To each of the divided chambers are connected an oil feeding passage provided with a variable restrictor and intended for the feeding of pressurized oil and an oil discharge passage intended for the discharging of the pressurized oil. A second shaft is coaxially disposed relative to the first shaft, and the first and second shafts are correlated with each other in such a way that the relative rotary displacement occurring between the two shafts controls the aperture of the oil discharge passages communicating with the divided chambers. The difference between the static pressures which are consequently produced within the divided chambers because of the aperture of the oil discharge passages causes the vane to swing, making it possible to control the torque even when the vane is in the neighborhood of its neutral position.

Abstract: The brake booster is connected in the hydraulic circuit containing the vehicle's power steering system. It is placed downstream of the power steering gear. A multi-functional accumulator/relief valve is provided. This valve functions as the flow restriction seat portion of the control valve to normally operate the booster, provides pressure relief to limit boost pressure to a predetermined maximum, and operates to controllably release pressure of an accumulator to the booster in the event that the power steering pump is not able to adequately perform as a pressure source for the brake booster.

Abstract: A hydraulic brake booster adapted to vehicles having a manually operable control valve to control pressure increase in the booster for attaining the available braking fluid pressure in the brake wheel cylinders of the vehicles. In the booster is employed a control device to hold off a reaction force on the pedal to actuate the booster so that a properly controlled brake feel is transmitted to the vehicle operator at an initial stage of actuation of the booster. An earlier pressure rise is attained in the wheel cylinders within an otherwise vainly consumed period of time as a timelag and accordingly a safe and reliable braking operation is performed.

Abstract: A booster having a vacuum powered booster section and a hydraulic powered booster section which are normally actuated together to supply boosted force to a master cylinder. When the air valve of the vacuum booster section is operated to cause atmospheric air to enter the variable pressure chamber of the vacuum booster, it also engages and moves the hydraulic booster control valve to restrict hydraulic fluid flow therethrough, causing the hydraulic booster section control valve to be actuated to create a hydraulic pressure differential across the power wall of the hydraulic booster section. Both booster sections deliver boosted force through the output member of the hydraulic booster section to the master cylinder. Either booster section is operable when for any reason there is no power available for actuation of the other booster section.

Abstract: A reaction mechanism of a hydraulic control valve including a control valve for regulating hydraulic pressure by controlling hydraulic fluid disgorged from a pump, an input member mechanically connected to the control valve and operated by a driver, the input member having a smaller diameter portion and a larger diameter portion, an annular reaction regulating member into which the smaller diameter portion of the input member is slidably inserted, a diameter of the annular member being equal to or less than the larger diameter portion of the input member, a biasing member for normally urging the annular member toward the larger portion of the input member, and a member for supplying the hydraulic pressure regulated by the control valve into an area between the annular member and the large diameter portion of the input member to displace the annular member from the larger diameter portion of the input member against the biasing member.

Abstract: Pressurized motive fluid flow passes through a single fluidic vortex orifice to opposite chambers of a differential area, double acting, linear servo-cylinder. While shifting in one direction the vortex orifice severely restricts the flow to the fluid chamber of the motor which is contracting in size so as to permit rapid movement of the piston in that direction, and whenever the piston is moving in an opposite direction the vortex orifice allows substantially unrestricted fluid flow to the same chamber which is now expanding in size, so that the piston can shift rapidly in this opposite direction.

Abstract: An apparatus for causing a low force input movement from a control rod to cause a corresponding movement in an output member by force amplification through hydraulic pressure. A piston is provided that has a greater pressure area on one side than on its other side. Orifice means are provided between a pressure chamber and a control chamber and between the control chamber and the reservoir such that as said second orifice means is varied, the piston will move until a null position is reached.

Abstract: A fluid driven actuator for a neutron absorber in a nuclear reactor is of the piston and cylinder type. The actuator is located above the reactor core. Means are provided for alternately opening and closing a by-pass fluid flow path or passage through or across the piston within the cylinder. The flow path is closed when the piston and control rod is being raised and is subsequently opened to reduce flow resistance during insertion or scram. In the preferred embodiment, the piston is longitudinally movable relative to the piston or extension rod which connects with the neutron absorber. In one position of the piston, the by-pass path is open and in another position, it it closed.

Abstract: A fluid pressure transducer device including first fluid pressure responsive means and second fluid pressure responsive means which together define a sealed volume of fluid. The first fluid pressure responsive means is exposed to first and second input fluid pressures and responsive to variations in one or both thereof to vary the volume of the sealed volume as a function of the first input fluid pressure modified by the pressure ratio of the second input fluid pressure to the first input fluid pressure. The second fluid pressure responsive means is responsive to the changes in the sealed volume of fluid and produces an output force signal in response thereto. There may be provided a variable volume chamber containing a temperature responsive element vented to the sealed volume of fluid to cause an increase or decrease in the sealed volume to compensate for temperature variations of the sealed volume of fluid.

Abstract: A hydraulic booster has its piston located in a normal passive position so that hydraulic fluid supplied to the cylinder through an inlet port enters the cylinder on both sides of the piston. Normally open valve means establishes communication through the piston from one side thereof to the other, and operating means is provided for closing the valve means and moving the piston past the inlet port to a position wherein hydraulic fluid flows through the inlet port into the cylinder on only one side of the piston. The normally open valve means includes an elongated valve sleeve slidably mounted in a piston bore having an enlarged intermediate portion defining a cavity surrounding the sleeve member. The sleeve member has a large external area within the cavity facing in one direction than in the other direction, and a leakage path is provided for communication of the cavity with the cylinder on one side of the piston.

Abstract: A vehicle hydraulic power brake and steering system has a hydraulic brake booster provided with a mechanism for operating a switch to indicate loss of hydraulic power, and for operating a control valve for admitting hydraulic pressure from another source such as an accumulator. The mechanism includes an actuating bar mounted in a recess formed in the wall of the hydraulic brake booster power cylinder and lying in the power chamber of the booster. The bar extends axially for a distance substantially equal to the power stroke of the power piston. An annular valve seat has a ramped groove which actuates a ball positioned in a radially extending passage of the booster piston and engaging the actuating bar in rolling contact. So long as hydraulic power pressure is available, the ramped groove does not move the ball radially outward.

Abstract: A servo-pressure operated piston arrangement includes a pilot valve which is movable by a torque motor against a biasing spring. A closed chamber is defined between one end of the piston and its surrounding cylinder, and this chamber communicates with an orifice which is shut by the pilot valve, under control of the biasing spring, to lock the piston relative to the cylinder if the torque motor fails.