Abstract: A master cylinder for an hydraulic pressure system has a pressure cylinder (1) on which is mounted a reservoir (11), the cylinder having an open end closed by a cap (3). The cap is positively coupled to the cylinder (1) by a coupling device (26) arranged so that resulting from pressure applied to the interior of the cap (3) is transmitted via said device to the cylinder.

Abstract: This invention relates to a fail-safe or auto-return actuator cylinder employing the air spring effect provided by compressed air trapped in an air-spring compartment; which air spring effect replaces the conventional mechanical coil spring employed in conventional fail safe or auto-return air cylinders. The air spring chamber integrally built into the cylinder body is connected to the compressed air supply tube through a check valve that provides the self-charging and self-recharging feature for the air-spring chamber and, consequently, the air-spring chamber remains fully charged with compressed air even when there is a compressed air leak from the air-spring chamber. The air-spring compartment stays charged or becomes automatically recharged even when there is a leak from the air-spring compartment as long as there is compressed air to actuate the cylinder.

Abstract: A fluid powered actuator system includes two identical fluid powered actuators operable by respective supply pressures which are controlled by respective identical valve arrangements. Operating positions of flow control elements of the valve arrangements are applied through respective couplings to a differential arrangement which operates, if these positions differ by an unacceptable amount, to apply an error indication through respective coupling to prevent the supply pressures from being applied to the respective actuators.

Abstract: Apparatus for controlling a plurality of moving members, e.g. the flaps in an installation for heating and ventilating or for air conditioning a motor vehicle, comprises single-acting actuators (46, 48) whose piston rods (50, 52) are connected to rotate the flaps about their respective axes (12, 14), with the actuators (46, 48) being fed from a pressurized fluid distributor (32) which includes moving elements which are respectively connected to control means and to each of the piston rods (50, 52), together with fluid flow servo control means for putting the displacement of one flap under the control of the displacement of another flap.

Abstract: A hydraulic master cylinder has a piston of cylindrical section slidably sealed within the cylinder bore. An insert is mounted on the piston and defines an axial groove for engagement of an abutment projecting laterally into the cylinder bore, and a transverse slot for retention of a lever which is adapted to engage the abutment to control the opening and closing of a breather valve.

Abstract: The return spring (33) of the actuating rod bears upon a collar (30) which is mounted so as to slide on the rod (21) and which incorporates, on the opposite side from the return spring (33), first (34) and second (35) bearing surfaces intended to cooperate, respectively, with an abutment (39) formed on the rod and a fixed abutment (43) advantageously formed by the end, which is folded back, of a tubular abutment component (40) which is firmly fixed to the casing (1).

Abstract: A hydraulic brake system comprising a pedal-operated brake booster (5), which is connected with the master cylinder (3) and includes an auxiliary pressure supply system (13), a booster piston (4), and a booster chamber (7) wherein an auxiliary pressure is established which is proportional to the foot pressure (F). The hydraulic brake system is provided with wheel brakes (14,15,16,17) connected to the master cylinder (3), a filling stage cylinder (18) is provided which displaceably houses a two-stage piston (20). A pressure chamber (21) is arranged in front of the large stage (83) of the two-stage piston (20) and a filling chamber (22) is arranged in front of the small stage (84) of the two-stage piston (20). In this arrangement, the filling chamber (22) communicates with one of the working chambers (26) of the master cylinder (3) and/or a brake line (28) by way of a pressure line (25).

Abstract: A fluid pressure operated device comprises a body adapted for moving an article and carrying magnets coupled to other magnets on a piston movable by fluid pressure in a cylinder. The body also carries spaced magnets and another piston carries spaced magnets. In a start position, one of said body magnets and one of said piston magnets are coupled. During normal operation the body and pistons move to another position in which the one body magnet operates a return sensor to return the device to start position. If an obstacle is encountered, the piston moves to release another sensor to reverse the device for a short stroke where a timer again reverses the fluid pressure to complete the stroke. Engagement with a second obstacle or a repeat engagement with the first obstacle returns the device to the start position and a warning alerts an operator to remove the obstruction.

Abstract: A brake system comprising a hydraulic braking pressure generator (1) to which are connected the brake wheels (6-9); an auxiliary pressure supply system including a hydraulic pump (10) and an auxiliary pressure control valve (12) causing an auxiliary-pressure proportional to the pedal force (F). Pressure-controlled multidirectional valves (27,28) are provided establishing a connection between either the braking pressure generator or the auxiliary pressure supply system and the wheel brakes (6-9). The pressure-controlled multidirectional valves (27,28) are structurally combined with a switching mechanism (41,42) to signal the operating condition of the brake system, in particular, a pressure breakdown or defective conditions of the valves. A connection is established, via one of the pressure-controlled multidirectional valves (27), between the pedal travel simulator and the braking pressure generator (1). The brake system can be applied to a slip-controlled system.

Abstract: High pressure, fluid-driven tension actuators, axially contractible upon inflation by a suitable fluid such as compressed air to convert fluid pressure energy into linear contraction displacement, employ nearly spherical shell surfaces when inflated constrained by meridian and parallel elements. The inflatable shells are formed of elastomeric resilient material, and the constraining elements in certain embodiments of the invention comprise a reinforcing, tubular, knitted, fabric sleeve that axially encompasses, conforms to, and is bonded to a resilient, hollow bladder which defines a fluid chamber having at least one conduit connected at a polar location to bladder and sleeve for inflating and deflating the chamber. The parallel and meridian elements for constraining the elastomeric resilient shell include a generally square constraining pattern extending in an equatorial band around the shell upon inflation of the nearly spherical shell.

Abstract: The subject of the invention is a control device (10) for a twin master cylinder of the type with two master cylinders positioned parallell to one another and side by side, the device (10) being capable of being positioned between an actuating pedal and the pistons of the masters cylinder, the device (10) incorporating a control rod (44) which is capable of being connected to the pedal and two pushrods (28, 28') which are each capable of acting upon one of the pistons, the pushrods (28, 28') being guided so as to slide parallel to the axes of the master cylinders. According to the invention, the control rod (44) cooperates with the push rods (28, 28') through levers (52, 54) each of which is hinged at one end (56, 58) to one of the rods (28, 28') and is pushed so as to bear at the other end (64, 66) upon a bearing surface (62, 60) of the other rod (28', 28) by means of a peg (80) which is firmly fixed to the control rod (44). Application to the braking systems of motor vehicles.

Abstract: In a sensitive analytical instrument having an optical bench carried by a base member, new and improved vibration and shock isolation apparatus which includes three spaced pneumatic mounts interposed between the optical bench and the base member to provide vibration and shock isolation therebetween, each of the mounts having a preselected optimum linear range of operation, a source of pressurized gas, apparatus for individually controlling the inflation and deflation of each of the mounts with pressurized gas to maintain actual operation of each of the mounts within its preselected optimum linear operating range.

Abstract: An inner wall for a transition duct between the high pressure and low pressure turbines of a multirotor gas turbine engine in which the wall structure itself is made up of multiple aligned segments which are bolted to the inner shrouds of the vane clusters of the low pressure turbine and in which the segments are secured to forward and rearward cone elements with one of said elements bolted securely to the segments and the other cone having free axial and radial movement with respect to the segments with the cone elements supporting at their inner edges a seal element to cooperate with a rotating element on a low pressure rotor.

Abstract: An auxiliary-energy-supplied brake slip control system of a vehicular hydraulic brake system with a brake-pedal-operable master cylinder arrangement (12) and with auxiliary energy supply into the working chamber (16) of the master cylinder. The master cylinder piston (23) portion facing the working chamber (16) is enclosed by a sleeve (58) which is longitudinally displaceable with respect to the master cylinder piston (23) and the master cylinder bore (63). The master cylinder piston (23) having radially extending projections or a collar (66) which, in the brake release phase, rests at the working-chamber-side front face of the sleeve (58) and moves the same back into its initial position. The booster-side front face of the sleeve (58) confines an annular space or a chamber (69) provided in the master cylinder housing and communicates with the booster chamber (21) by way of a pressure line (64).

Abstract: The invention relates to a bellows in which the cover projects like a roof over the two arms and the apexes of the inner layer of the arms are supported on the inner layer of the cover. In this way a very robust and wear-resistant construction of the bellows is obtained.

Abstract: The master cylinder (10) comprises a housing (12) having a longitudinal bore (14), a housing end (16) enclosed by a bearing member (18) which retains a sleeve member (20) within the bore (14), a reservoir (70) mounted on the housing (12) and a pair of pistons (30, 40) received slidably within the bore (14), one piston (30) extending through an end (24) of the sleeve member (20). The one piston has an end (32) which provides seating for a fast fill valving mechanism (110). The fast fill valving mechanism (110) comprises a piston support guide (120) supporting a fast fill seal (150) and seal retainer (160) between the support guide (120) and the surface (23) of the sleeve member (20). The seal retainer (160) engages one end (142) of a spring (140), the other spring end (143) located at the end (32) of the piston.

Abstract: A master cylinder has a piston slidably fitted in a stepped cylinder bore including a first pressure chamber connected through a coupling hole to a reservoir. When a fluid pressure in the first pressure chamber is increased to a predetermined level at the time the piston is moved forward, a second valve disposed in the coupling hole is opened to release a fluid pressure from the first pressure chamber into the reservoir. When a negative pressure is developed in the first pressure chamber as the piston is moved back, a first valve in the coupling hole is opened to supply a fluid from the reservoir into the first pressure chamber.

Abstract: The present invention relates to a fluid-operated actuator, constituted by a cylinder and by a double-effect piston, provided with a device suitable to automatically locking the same piston at the end of its working stroke.

Abstract: A braking pressure generator with a master brake cylinder (2) and a hydraulic brake power booster (1) connected upstream thereof and comprising a piston (16) of larger effective surface which latter is incorporated axially movably within limits in a bore (15) in a stepped piston (10) of smaller effective surface extending through the booster chamber (8). The piston (16) serves to actuate a master cylinder piston (31). During an actuating action the two pistons (10, 16) are maintained in their position moved apart from one another even in the event of pressure drop in the booster chamber or in excess of the point of maximum boosting. This is accomplished in that both pistons (10, 16) enclose a pressure chamber (23) which is connectible to the booster chamber (8) through a valve passage (19) closable by the actuating element (6) of the brake power booster (1) as well as through a non-return valve (25) in parallel relationship thereto.

Abstract: A hydraulic multiple-circuit brake system is proposed, the brake amplifier of which has a multiple-chambered refill container. With an intake connection of its pump, an energy supply apparatus comprising a pump and a reservoir is connected at a predetermined fill level (h/2) to the refill chamber which is intended for the supply of an open brake circuit (II). In this manner, it is attained that if there is an energy failure, the open brake circuit will be capable, as a closed brake circuit, of continuing to function.