Abstract: A brake system for a motor vehicle. A braking pressure source and at least one wheel brake, which can be impinged by brake pressure provided by the brake pressure source. The brake pressure is provided with at least one pressure piston arranged so that it is linearly displaceable in a pressure cylinder, and with an engine for displacing the pressure piston in the engine which is coupled to pressure piston via a gear. At the same time the gear is provided with force transmission paths which are at least partially parallel to each other and arranged in an operative connection between the engine and the pressure piston.

Abstract: A hydraulic cylinder comprises a piston assembly with a piston and a piston rod, a cylinder housing with a housing bottom, a pressure chamber in the cylinder housing delimited by the piston and housing bottom, a spring element which prestresses the piston assembly away from the housing bottom, and a fixing element which fixes the piston assembly in a predefined stroke position relative to the cylinder housing prior to first actuation of the hydraulic cylinder and is designed to release the piston assembly relative to the cylinder housing upon first actuation of the hydraulic cylinder. The spring element is arranged on the side of the piston which is remote from the pressure chamber, whereas the fixing element is provided in the pressure chamber at the housing bottom and co-operates with a mating element on the piston to releasably fix the piston assembly relative to the cylinder housing.

Abstract: The present invention is directed to a computer based control system for controlling hydraulic and electromechanical actuators on a power machine, such as a skid steer loader. The computer based control system is configured to implement a number of features to enhance certain operational aspects of the power machine.

Abstract: A drive device for closing unit, injection unit or ejectors of a plastics injection molding machine, has a drive element which is axially moveable, and a hydraulic unit which is moveable by the drive element in the same direction as the drive element. The hydraulic unit is a force multiplier with a large piston and a first small piston, which are moveable in relation to one another and differ in size of their effective surface areas. An intermediate part together with the pistons encloses a pressure chamber filled with a pressure fluid. The first small piston is mechanically connected to the drive element. A second small piston with the intermediate part define a fluid chamber connected by a valve, in one embodiment, to the pressure chamber. The hydraulic unit as a whole is moveable for the positioning movement and the intermediate part is blockable against displacement in relation to a fixed frame.

Abstract: A retaining unit 8 is constituted by a first retainer 25 and a second retainer 26. The first retainer 25 and the second retainer 26 are mounted, respectively, on a bleeder screw 7 of a cylinder body 11 and a projecting portion of a piston rod 19. While the piston rod 19 is being forced in a cylinder bore 13, first and second engagement portions 25d, 26e are brought into engagement with each other, and the piston rod 19 is retained in a retracted state. The engaged state of the first and second engagement portions 25d, 26e is released by removing the first retainer 25 from the bleeder screw 7, whereby the piston rod 19 is allowed to extend.

Abstract: A pressure intensifier drive unit has walls that form a cylinder with an intermediate divider plug separating a working chamber and a pressure intensifying chamber aligned in the cylinder. The working chamber has a working piston and a working piston rod extending from an end of the cylinder. A carrier piston is located between the working piston and the divider plug and has a cylindrical recess receiving the working piston, a hydraulic fluid chamber, and a bore. A locking piston is movably mounted on the carrier piston and locks the carrier piston in place when the working piston rod initially contacts a workpiece. A pressure intensifier piston in the pressure intensifying chamber has a pressure intensifier piston rod extending through a bore in the divider plug and through the bore in the carrier piston into the hydraulic fluid chamber.

Abstract: An anti-theft system for vehicles pressurizes and locks the hydraulic brakes whenever voltage is removed from a special master brake cylinder. The master brake cylinder has all the conventional parts, but the central rod which carries the hydraulic pistons extends past the usual point and attaches to a permanent magnet at the end of the rod. A coil spring forces the rod in the direction of rod movement needed for brake activation, toward a solenoid. The solenoid is powered by the vehicle battery. The spring is prevented from continuously engaging the brakes by the magnetic repulsion of the permanent magnet by the solenoid. The magnetic force acts to disengage the brakes. When the current is cut off, so is the magnetic repulsion, and the unbalanced force of the spring pushes the rod to engage the brakes. The solenoid current can be switched on or off by a remote switch. The switch may be closed and opened remotely through a radio link.

Abstract: Disclosed is a brake locking mechanism of the anti-theft type for use with a vehicular brake system having a brake actuating push rod reciprocable by a driver operated lever into the brake applying position. The brake lock comprises a locking mechanism attached to the brake pedal by an elongated linking member and a remote switch for engaging and disengaging the lock. The locking mechanism preferably comprises a pawl and ratchet assembly or a piston and fluid operated cylinder. The lock may be either manually activated by pressing on the brake pedal or automatically activated by positioning a three-way valve and engaging a pump.

Abstract: The hydraulic brake booster (12) of the present invention comprises a full power hydraulic brake booster (12) that provides false travel during full power operation and improved pedal feel during manual operation. The booster (10) has a housing (24) with a slidable sleeve assembly (60) therein, the assembly (60) housing a sleeve member (98) which is displaced by accumulator fluid pressure against a collet housing (78) and a moveable collet member (79) located about an input member (94). The sleeve member (98) displaces the moveable collet member (79) against a resilient member (77) when the sleeve member (98) is displaced by hydraulic fluid pressure from the accumulator (14).

Abstract: A brake locking mechanism of the anti-theft type for use with an automobile vehicular brake system having one or more fluid operated brakes, a master cylinder and an actuator for reciprocating a piston in the cylinder to apply and release the brakes. The locking mechanism has a housing adapted to fit between the master cylinder and the actuator, means such as a ratcheted rod within the housing for reciprocating the piston responsively to the actuator, and means such as a pawl operatively associated with the ratcheted rod for locking the reciprocating means with the piston in the brake applying position. The locking means is remotely controlled from a keyed or combination lockable control mechanism located in the driving compartment of the vehicle which may be mechanical or electronic.

Abstract: A hydraulic apparatus for remotely controlling the operative mode selector of a motor vehicle automatic transmission. The apparatus comprises a master cylinder having an input member operatively connected to the transmission operative mode selection or shift lever placed at the disposal of the motor vehicle operator, and a slave cylinder mounted on or proximate the transmission casing and having an output member connected to the transmission operative mode selector, the master cylinder and the slave cylinder being placed in fluid communication through flexible conduits such that each displacement of the master cylinder piston as a result of displacement of the master cylinder input member causes a corresponding displacement of the slave cylinder piston coupled to the slave cylinder output member.

Abstract: A retainer assembly for use with an hydraulic clutch actuator of the type including a master cylinder and a slave cylinder in fluid communication with one another. The retainer assembly acts to maintain the output member of the slave cylinder in a retracted position during shipment, storage, and vehicular installation of the hydraulic actuator. The assembly includes a rupturable plastic strap having a control socket and connected as a harness over the end of the slave cylinder output rod. The assembly further includes a non-rupturable steel wire positioned over the socket portion of the plastic strap. The free ends of the wire are clipped around the mounting flange of the cylinder body.

Abstract: The hydraulic brake booster (12) includes a resilient member (96) disposed between an input member (94, 194, 294) and a pair of valve members (98, 101; 112) which control fluid pressure flow from an accumulator (14). When the input member (94, 194, 294) is actuated by the vehicle operator, theresilient member (96) is compressed so that the input member (94, 194, 294) moves relative to the valve members (98, 101; 112) and thus provides for greater movement of the input member (94, 194, 294) than for the valve members (98, 101; 112). The booster (12) includes a hydraulic or mechanical lockout which, in the absence of fluid pressure from the accumulator (14), eliminates the movement of the input member (94, 194, 294) relative to the valve members (98, 101; 112) so that the relative movement eliminated is not added to the valve stroke during manual operation of the booster (12).

Abstract: This mechanism makes it possible to obtain in succession a fast approach stroke (C), and then a work stroke with a substantial developed stress, in operations such as riveting or marking, the work stroke being started as the tool (16) comes into contact with the part to be pressed (25). A control stem (4) and a body (9) are movable along one and the same axis (3), means such as a clack (31) providing for their non permanent locking. The stem (4) is integral with a primary piston (8) penetrating into a hydraulic circuit (10, 11) of the body (9); this circuit communicates, on the one hand, with an expansible casing (19) surrounding the body (9) and making it possible to block this body with respect to the frame (1), and on the other hand, with a chamber (12) in which a secondary piston (15), drawn back by a spring (18) and integral with tool (16), slides.

Abstract: A vehicular hydraulic brake apparatus comprises a tandem master cylinder having front and rear sections respectively connected by independent front and rear wheel braking hydraulic circuits to front and rear wheel brake cylinders. The rear wheel braking hydraulic circuit is provided therein with a deceleration-responsive braking pressure control device having pressure inlet and outlet normally communicated with each other. The pressure control device has an inertia valve comprising a ball and a valve seat and a first differential piston both disposed between the pressure inlet and outlet. When the deceleration of an associated vehicle reaches a predetermined value, the ball is moved to close the valve for thereby interrupting the communication between the pressure inlet and outlet. In normal operative condition of the apparatus, the differential piston is operative to modulate the inlet pressure after the valve closure and transmit the modulated pressure to the rear wheel brake cylinders.