Abstract: A fluid power device such, for example, as one for opening and closing clam shell gates is operated by a ram under fluid pressure. A tank is provided for storing fluid under pressure and by a system of valving extension of the ram, as for a gate opening operation, is inhibited until enough fluid under pressure is stored in the tank to assure completion of reverse operation of the ram to close the gates.

Abstract: A pressure fluid operated feed drive system for a movable member, and particularly for a slide of a machine tool, the system having a source of fluid pressure feeding a pair of interconnected piston and cylinder units connected between the member and a fixed support. The piston rod side areas of the pistons are arranged in effective opposition and valve means are provided to permit pressure fluid to be supplied selectively to the units to enable the member to be moved alternatively by a force derived from differing piston areas.

Abstract: 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 a hydraulic piston for moving the power shaft together with a backup system that assures a shaft position proportional to the throttle position. This permits the use of electrical lines from the cockpit to the engine rather than mechanical cables and linkages.

Abstract: A step-by-step controlled servomechanism of the type comprising a drive element movable provided with a plurality of receiver ports, and a fixed distributor to supply said receiver ports and having a number of transmitter ports capable of being connected, in pairs, respectively to the low pressure and to the high pressure, a fixed manifold having a plurality of manifold ports capable of communicating with the chamber of the drive element, all the receiver ports being capable of being made to open in succession into one of said manifold ports, selecting means capable of connecting, in succession by permutation and simultaneously, at least one pair of transmitter ports to the high pressure and to the low pressure, respectively, and at least one manifold port to the chamber of the drive element.

Abstract: Device for a hydraulically driven percussion hammer for activating a tool, comprising a differential piston with corresponding cylinder, where the piston's largest surface is closest to the percussion tool, and where the smallest working surface is in direct hydraulic connection with an air tank. The largest working surface is above a multiple valve in connection with a hydraulic pressure medium. The valve is adjustable from an admission position with closed return duct to a position where the admission is blocked and the return duct is open. The piston chamber above the piston's small working surface has a feed duct with back pressure valve for a hydraulic pressure medium.

Abstract: A column including a cylinder, a piston axially slidable in the cylinder cavity, a piston rod axially projecting from the cylinder, and a valve permitting selective communication between the two compartments of the cylinder cavity separated by the piston for flow of fluid between the compartments is additionally provided with a helical compression spring coiled about the piston rod and impeding axial movement of the piston on the piston rod in one direction, movement in the other direction being limited by a radial abutment flange on the piston rod. The spring favorably affects the comfort of a chair whose seat is mounted on the column.

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: A pressure medium servo-motor, especially for servo-steering systems, in which a working piston operating in a working cylinder is provided with a piston pressure surface actuatable by the pressure in one working pressure chamber of the working cylinder for producing a servo-force directed in the sense of the relative movement of the working piston with respect to the working cylinder; the piston pressure surface of the working piston is thereby reduced with respect to the reference value fulfilling the equilibrium condition of the piston pressure forces in the neutral position of the working piston, by a reducing piston which includes a pressure disengaging surface actuatable by the pressure in the working pressure chamber and a relief pressure surface actuatable by the pressure in a relief pressure chamber.

Abstract: Disclosed is an improved double acting piston actuator proportionally controlled by a pulse duration modulated control valve having a gas metering orifice in the actuator gas supply line to decrease gas consumption. The orifice reduces gas pressure applied to the actuator in proportion to the rate of gas use. The actuator has maximum gas consumption at mid range where actual load is a minimum and minimum consumption at actuator extremes where the load is maximum. The orifice thus supplies maximum pressure only when needed and reduces pressure and consumption under no load conditions.

Abstract: A control valve for a pressure medium servo-motor of a servo-steering mechanism whose valve-adjusting member includes a reaction pressure surface that is immovable relative thereto and is adapted to be acted upon by the reaction pressure in a reaction pressure chamber connected exclusively to one of the two working pressure chambers of the working cylinder of the servo-motor; the valve-adjusting member is also connected with the reaction piston in such a manner as to enable a limited free relative adjusting path between the valve-adjusting member and the reaction piston; the reaction piston, in its turn, includes a reaction relief pressure surface which is adapted to be acted upon by the reaction pressure in a reaction pressure chamber connected exclusively to the same working pressure chamber and which is oppositely directed to the reaction pressure surface; the reaction piston is also supported with respect to the valve housing by means of a spring member which is under a prestress force while its reaction

Abstract: An arrangement for limiting the steering-power in hydraulic servo-steering systems provided with a valve of the type of a three-way three positions valve for controlling a pressure flow from a pressure source to a working space of a preferably higher effective area of a servo-motor or from the working space to a return flow, in which the working space of a preferably lesser effective area is always connected with the pressure source, and the reaction areas with hydraulic reaction areas serve for signalling back a steering sensation to the steering wheel, which reaction areas are arranged to the various effective areas of the servo-motor, and, in combination with respective lever arms, etc., and/or respective reaction areas define a torque dynamometer, etc.

Abstract: In a control system of the type having a hydraulic cylinder, a piston slidable in the cylinder and dividing the interior thereof into a first and a second pressure chamber, a pressure fluid reservoir, a pump, conduits having a valve interposed therein which is electronically controlled and connects the second chamber with the reservoir or pump, respectively, or block the second chamber, and an auxiliary device for operating the system in the event the electronic control for the valve malfunctions, the invention provides a movable member extending into the second chamber; subdividing means located in the second chamber intermediate the movable member and the piston and subdividing the second chamber into a first and a second compartment, the movable member being operable to shift the subdividing means in the second chamber; and valve means controlling communication between the compartments and of the same with the first chamber, the valve means forming with the piston and with the movable member a follow-up co

Abstract: A power generating device that transforms the energy of vapor under pressure from a volatile liquid into useful rotational power that may be used in a stationary location or to propel a vehicle. The vapor under pressure is generated either by heating the volatile liquid in a confined space by means of fuel, or by utilizing solar energy for this purpose.After the vapor has passed through the power generating device it is cooled and returned to the liquid state. The volatile liquid is, by means of a pump, returned to the confined space where it is again heated to transform to vapor under pressure, with the vapor then being recycled through the power generating device.

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: Disclosed is a pneumatic launch apparatus which employs separable telescoping tubes. The open ends of the tubes are provided with valves which automatically close upon separation of the tubes to trap operating gas in the tubes at the moment of separation.

Abstract: Step by step controlled servomechanism of the cylinder-type comprising a drive element movable in a case which it divides into two chambers and provided with a plurality of receiver ports, a distributor adapted to be put in communication with the high pressure and the low pressure and to supply said receiver ports, wherein said distributor is fixed and provided with a number of supply or transmitter ports at least equal to three but independent of the number of receiver ports, the transmitter ports being capable of being connected by permutation, in succession and in pairs, respectively to the low pressure and to the high pressure, the distance between the receiver ports and their length, on the one hand, the distance between the transmitter ports and their length, on the other hand, being such that, by the step by step displacement in one direction of the drive element, on one hand, it is possible to bring each time at least one receiver port between the two transmitter ports of a pair in such position that

Abstract: A fluid actuating device for an electric switching apparatus such as a high-voltage power circuit breaker or the like includes an actuator for actuating the electric switching apparatus. The actuator includes a cylinder and an actuator differential piston movable in the cylinder between first and second positions corresponding to the open and closed positions of the switching apparatus. The actuator differential piston has two end-faces for receiving fluid pressure force and one of the end-faces has a larger surface area than the other one of the end-faces. A pressure fluid supply supplies fluid under pressure and is connected to the actuator for continuously supplying fluid under pressure to the other one of the end-faces. A switching-valve alternately interrupts and connects the fluid from the pressure fluid supply to the one end-face of the actuator differential piston whereby the actuator differential piston is caused to move between its first and second positions.

Abstract: A circuit breaker actuating device comprising valve means interposed between a high pressure section of an operation fluid and a low pressure section thereof to preclude communication therebetween and adapted to cause a variation in pressure to occur either in a high pressure source or low pressure source when actuated to establish communication between the high pressure section and the low pressure section, so as to thereby actuate piston means and cause a circuit breaker to perform a current interrupting operation.

Abstract: A control cylinder assembly for servo-steering systems including a fluid pressure circuit and steering shaft and an output shaft, in which a servo piston is supported during axial travel by axially spaced sleeves connected to a housing cover and the sleeves form circumposed fluid areas, and the piston forms opposed variable-volume operational areas, all of the areas being operatively connected in a fluid pressure circuit.

Abstract: A fluid actuating device for an electric switching apparatus such as a high-voltage power circuit breaker or the like includes an actuator for actuating the switching apparatus. The actuator in turn is made up of a cylinder and an actuator differential piston movable in the cylinder between positions corresponding to the open and closed positions of the switching apparatus. A fluid supply provides fluid under high-pressure to the end-faces of the actuator differential piston. A main-valve arrangement includes a main-valve differential piston movable for alternately interrupting and connecting fluid from the fluid supply to one of the end-faces of the actuator differential piston whereby the actuator differential piston is caused to move between its end positions. The main-valve differential piston also has end-faces fluidly connected to the fluid supply.

Abstract: A proportional force amplifier having a cylinder separated by a piston assembly into a pressure chamber, a control chamber and a reservoir chamber, a spool valve mounted for axial movement within a bore in said piston assembly to selectively connect the control chamber to either the pressure chamber or the reservoir chamber, the piston assembly moving in response to the change in pressure between the pressure chamber and the control chamber a distance equal to the distance of movement of the spool valve, the spool valve being connected for actuation by a resilient compensating rod and being pressure balanced.

Abstract: A servo steering system for motor vehicles has a stepped servo piston arranged in a cylinder-forming space of a housing for dividing the cylinder space into a pair of separated working spaces of different volumes. The servo piston is engaged by a worm shaft connected to a steering wheel of the vehicle and arranged extending into the housing. The working space having the larger volume is connected to a pressure source by a valve member operatively connected with a lever associated with the servo piston for controlling fluid flow through the working space and magnifying movement of the worm shaft, with the smaller volume working space of the servo piston being connected directly to the pressure source. Reaction spaces of a stepped control piston of the valve member are substantially in the same ratio as the working spaces of the servo piston.

Abstract: A servo mechanism for a prime mover interconnected to a hydrostatic transmission includes a source of pressurized fluid, a fluid reservoir, an actuator having a piston operatively connected to the hydrostatic transmission and being provided with large and small hydraulic receiving areas which are exposed to first and second hydraulic chambers, respectively within the actuator housing, a first passage for connecting the pressurized fluid source to the second chamber, a second passage for connecting the pressurized fluid source to the first chamber, a third passage for connecting the first chamber to the reservoir, and a pair of spool valve means disposed, respectively, within the second and third passages and responsive to a signal indicative of the power required of the prime mover and an actual speed or feedback signal of the prime mover.