Abstract: A brake/clutch master cylinder for a motorcycle/bicycle or the like, with a body which is produced by moulding of plastics material reinforced by glass fibre without the need for machining operations or metal inserts and which forms, together with the cylindrical shell of the master cylinder, a hydraulic-fluid reservoir, a coupling sleeve for a male quick-fit hydraulic connector, and a seat for fixing to a handlebar, the body having a high degree of structural stiffness with respect to working stresses and adequate resilience for impact stresses imparted to the body by means of the hand operating lever.

Abstract: A master cylinder for a bicycle hydraulic disc brake includes a cylinder having a port in fluid communication with a hydraulic fluid reservoir. The port opens to the cylinder between first and second ends of the cylinder. A piston within the cylinder is movable between a select starting position with the seal between the first end of the cylinder and the port opening with the piston a select distance from the port opening and a pressurized position with the seal between the port opening and the second end of the cylinder. A dead-band adjustment structure is operatively associated with the piston for moving the select starting position to adjust the select distance between the port opening and the seal. A lever is pivotably attached to the housing and is operatively associated with the piston to move the piston between the select starting position and the pressurized position as the lever is pivoted between a rest position and a fully-actuated position.

Abstract: A control lever for operating a control system of a vehicle, such as a brake or clutch of a motorcycle, for example. The lever is especially useful with hydraulic control systems, for applying a force to a hydraulic piston of the control system. Preferably, the lever includes an engagement portion that contacts an end surface of the piston. The engagement portion may be free to rotate with respect to a body portion of the lever such that the engagement portion rolls across the end surface of the piston. Such an arrangement provides improved lever “feel” and substantially prevents transverse loading of the piston. The engagement portion may also include a protruding arm that engages the end surface of the piston, for use with hydraulic control systems where the piston is recessed within a housing.

Abstract: A master cylinder for a bicycle hydraulic disc brake includes a cylinder having a port in fluid communication with a hydraulic fluid reservoir. The port opens to the cylinder between first and second ends of the cylinder. A piston within the cylinder is movable between a select starting position with the seal between the first end of the cylinder and the port opening with the piston a select distance from the port opening and a pressurized position with the seal between the port opening and the second end of the cylinder. A dead-band adjustment structure is operatively associated with the piston for moving the select starting position to adjust the select distance between the port opening and the seal. A lever is pivotably attached to the housing and is operatively associated with the piston to move the piston between the select starting position and the pressurized position as the lever is pivoted between a rest position and a fully-actuated position.

Abstract: A brake handle device for a hydraulic brake assembly includes a barrel received in a housing and having an outer peripheral depression for forming an annular chamber between the barrel and the housing. A plunger is slidably received in the barrel and has an outer peripheral recess for forming an annular space between the plunger and the barrel. The barrel has two apertures for communicating the annular chamber and the annular space. The housing has a cavity for receiving a spring-biased panel and for regulating the oil when the oil is expanded.

Abstract: Apparatus for controlling the gears of a motor vehicle comprising a pivotable gear lever for pivoting between gear positions corresponding to the gear positions for the motor vehicle transmission, a primary hydraulic piston/cylinder arrangement coupled to the gear lever, a secondary hydraulic piston/cylinder arrangement coupled to the gearbox of the motor vehicle, and a hydraulic circuit hydraulically communicating with the primary and secondary hydraulic piston and cylinder arrangements and including a flow limiter valve with an open position in which the hydraulic flow in the hydraulic circuit is not limited and a plurality of closed positions for controllably limiting the hydraulic flow in the hydraulic circuit whereby movement between the various gear positions for the motor vehicle is controlled.

Abstract: In a master cylinder device for a vehicle having a master cylinder with a cylinder body attached in the vicinity of a grip of a steering bar handle, and an operating lever which is supported on the cylinder body through a pivot and is pulled toward the grip to thereby push a piston of the master cylinder, the cylinder body is mounted in such a position that, below the axis of the bar handle, the axis of the cylinder body is substantially orthogonal to a vertical plane which includes the axis of the bar handle, whereby the master cylinder can be mounted even in a narrow space on the bar handle in a motorcycle and the like having a steering bar handle.

Abstract: A brake system 1 of the invention comprises a brake pedal 2, a booster 3 which boosts the input force applied by the brake pedal 2 and outputs the boosted force, a travel amplifying mechanism 4 which amplifies the travel of an output shaft of the booster 3 and outputs the amplified travel, a master cylinder 5 which develops master cylinder pressure when the output from the travel amplifying mechanism 4 is applied to the master cylinders 5, and wheel cyclinders 6 which develop braking forces when the master cyclinder pressure is introduced into the wheel cyclinders. By the travel amplifying mechanism 4, the travel of the brake pedal 3 in the initial stage of operation is amplified by the travel amplifying mechanism and is then transmitted to the master cylinder 5, whereby the idle stroke of the operating member caused by various idle portions in stroke in the brake system can be effectively shortened.

Abstract: A front brake master cylinder relocation kit which may be used for example on Harley-Davidson.RTM. motorcycles. The kit includes a master cylinder; a brake cable; a hand lever capable of being mounted on a handlebar; a brake hose; a mounting bracket, for mounting the master cylinder on a motorcycle; and a package for accommodating the master cylinder, the brake cable, the hand lever, the brake hose, and the mounting bracket. The master cylinder includes a brake cable connector; an actuator lever; an actuator device, operatively connected to the actuator lever; an oil container inside the master cylinder for accommodating hydraulic oil; and a brake hose connector operatively connected to the oil container. The package may be provided with assembly instructions for the kit.

Abstract: For an automatic hydraulic pressure generator in which a hydraulic master cylinder driven by a computer-controlled motor lets in or takes out a friction clutch, an operation device is provided that can make the piston rod of the hydraulic master cylinder operate at high torque and at high speed and further that is advantageous in durability of its conversion mechanism from rotary motion to linear motion.

Abstract: A master cylinder for a hydraulic friction clutch, said master cylinder being connected to a physically actuatable pedal by a piston rod (17) which is articulated in semi-shells (14) enclosed in a piston skirt bushing (10), an end of said piston skirt bushing (10) remote from the piston rod (17) being connected to a piston (7) which is longitudinally displaceable in a guide sleeve (96) of the master cylinder (1), an end face of said piston (7) delimiting a pressure chamber (8) wherein the semi-shells (14) fill an inner space of the piston skirt bushing (10) without play and comprise a cup-shaped recess (15) in which a ball head (16) of the piston rod (17) is retained by positive locking, the piston skirt bushing (10) forming a structural unit with the radially stepped piston (7).

Abstract: An improved force transfer arrangement for use in a dual circuit master cylinder having a pair of nested concentric pistons for pressurizing a pair of respective fluid chambers, wherein the force transfer arrangement imparts an input force from an input piston on a pair of pistons such that the pair of pistons can move relative to each other to compensate for different travel lengths. The invention discloses three embodiments of the improved force transfer arrangement. A first embodiment includes a hydraulic fluid chamber in fluid communication with the input piston and the pair of pistons. A second embodiment includes a circumferentially arranged ball mechanism positioned between the input piston and the pair of pistons. A third embodiment includes a notched lever ring assembly positioned between the input piston and the pair of pistons.

Abstract: A brake system is provided in which, in the normal operation, the brake pressure in the wheel brake cylinders is generated in a power-assisted manner and the master brake lines are closed by change-over valves. During a functional disturbance, the brake pressure in the wheel brake cylinders is built up by way of a master brake cylinder, such that, when the brake pressure control device operates normally also when the switching valves are closed the brake pedal can carry out a pedal travel and, on the other hand, when there are functional disturbances of the brake pressure control device, at most with a slight idling path of the brake pedal, by the operation of the brake pedal in the master brake cylinder and the wheel brake cylinders, a brake pressure can be generated in a conventional manner.

Abstract: A rotary drive unit powers a double-acting cam and a Geneva drive. The cam actuates two double-acting pumps which supply pressurized hydraulic fluid to a double-acting motor. A punch is reciprocated by the motor to punch sectors from a sheet material. The Geneva drive rotates a carrier which is indexed to receive material punched from the sheet. The hydraulic fluid is maintained in the system by a pair of check valves which deliver fluid as required from a pressurized reservoir to the pumps during a low pressure portion of the pumping cycle. Also provided are bleed and fill valves and pressure relieve valves which further assist in filling the system and controlling the maximum system pressure.

Abstract: An operating lever mechanism for a master cylinder which includes a mounting bracket (12) and a lever (23) mounted on the bracket trough a pivot pin (22). The lever is connected to a master cylinder actuating rod (25) and the pivot pin (22) is adjustably mounted on the bracket in slots (27) so that by turning an adjuster wheel (31) the pin (22) is moved in the slots (27) to vary the distance between the pivot axis of the lever and the connection of the lever with the master cylinder actuating rod (25) to adust the operating lever ratio of the mechanism as desired.

Abstract: An assembly of a pneumatic brake booster (100) and a master cylinder (200) for a motor vehicle. The pneumatic brake booster (100) has a casing (20) fixed to the bulkhead (10) of the vehicle. The casing is divided in leaktight fashion by a movable wall structure (22) into a front chamber (24) permanently connected to a source of partial vacuum and a rear chamber (26) connected selectively to the front chamber (24) or to the atmosphere by a valve means (16). The valve means (16) is actuated by a control rod (14) for actuating a push rod (28). The master cylinder (200) has a body (21) formed with at least first and second flanges (38, 38'; 40, 40'). The first and second flanges (38, 38'; 40, 40') interact with corresponding screws and nuts to fix the body (21) with the casing (20) of the booster (100). The body (21) has a bore (34) for slidingly receiving at least one piston (32) which is actuated by the push rod (28) of the brake booster (200).

Abstract: The liquid pressure controller includes an operating piston directly operated by a mechanical member such as a brake or clutch. An acting piston is connectable to the operating piston and directly acts for producing a liquid pressure of a portion to be operated. A liquid pressure controller connects the acting piston to the operating piston or releases the connection and actuates only the acting piston.

Abstract: A gear shift device for gear boxes for vehicles, comprising at least one pair of mutually connected, double-acting hydraulic cylinders (1,2), where the pair consists of a master cylinder (1) and a slave cylinder (21). The master cylinder can be operated via a gear lever and the slave cylinder moves a mechanism which is connected to gear selector carriers in the gearbox. According to the invention each end section of the master cylinder's (1) piston (4) has an outer (54 or 55) and an inner (56 or 57) piston sealing ring which are arranged at intervals, calculated in the piston's longitudinal direction, and in these end sections there is provided a drilling (52 or 53) whose first end leads into the piston surface between the respective end sections outer and inner sealing rings (54, 56 and 55, 57 respectively), and whose second ends leads into the adjacent end face of the piston (4).

Abstract: A device for driving a tool in axial direction in the course of a vibration-like forward and reverse movement, which operates at high efficiency with a rapidly oscillating stroke frequency and can be used as an easily handled hand-held appliance because, due to the drive, an especially advantageous ratio of the weight and volume to the power exerted at output is feasible. This drive consists of a piston (8) movable non-positively to and fro, which feeds oil to a working piston (22) and moves the latter correspondingly to and fro against the pressure of a spring (25) acting on the working piston (22) and against the external air pressure. The tool to be drive is preferably connected with the working piston (22) by means of the counterpressure spring (25). Working cylinder (20) and master cylinder (9) are connected with each other by a flexible hose (14) to prevent any weight transmission to the hand-held appliance. (FIG.

Abstract: A hydra-jack screw apparatus is provided for exerting a force against an object, for adjusting the magnitude of the force exerted against the object, and for providing a visual indication of the magnitude of the force exerted against the object. The apparatus is comprised of a base member housing a piston chamber, a jack screw extending from the bottom of the base member, a fluid pressure gauge mounted on the base member, and a pair of pistons received in the piston chamber for reciprocating movement. One of the pistons has a piston rod that extends through a center bore of the jack screw and engages against an object against which a force is to be applied. The second piston has a piston rod that extends from the piston chamber of the base member and is attached to a manual forced adjusting knob. A volume of fluid is contained in the piston chamber between the first and second pistons, and as the manual knob is turned, the pressure of the volume of fluid is adjustably increased or decreased.

Abstract: The invention relates to an assembly consisting of a brake booster and of a master cylinder (50), the booster comprising, in a casing (10), at least one movable wall (14, 14') which sealingly divides the interior of the casing (10) into a front chamber (16, 16') and a rear chamber (18, 18'), an input member (24) intended to be connected to a brake pedal and displacing the movable wall (18, 18'), and an output member (28) actuating a piston (46) of the master cylinder (50). According to the invention, a transfer member (40) is arranged between the front face of the casing (10) and the master cylinder (50), this transfer member (40) being actuated by the output member (28) of the booster along a first axis (A--A) and actuating the piston (46) of the master cylinder (50) along a second axis (B--B), and the brake booster, the transfer member (40) and the master cylinder ( 50) form a modular construction.

Abstract: A hydraulic pressure actuating system has a master cylinder pivotally mounted to the dash panel in line with the actuator pedal, a remotely mounted hydraulic fluid reservoir assembly positioned at the high point of the system for self-bleeding, and an actuating device actuated by pressurized fluid generated by actuation of the master cylinder. The reservoir assembly uses a fluid flow valve mechanism to control its connection with the fluid passage means of the system. Several types of reservoirs are disclosed, including a siphon tube arrangement and various flexible bag arrangements. The reservoir volume is contained in minimum space by using a sidesaddle reservoir arrangement. Indicator arrangements are also disclosed which when actuated indicate actuation and release of the master cylinder in one instance and the amount of fluid in a flexible bag reservoir in another instance.

Abstract: A twin master cylinder for a road vehicle brake system has master cylinders assigned respectively, to a front-axle brake circuit and to a rear-axle brake circuit. The master cylinders are arranged laterally next to one another in a common housing and are each actuable via an arm of a pivotable rocker with a variable ratio L1/L2 of the lengths L1 and L2 of arms of the rocker. A supporting element is provided which, by its support point on the pivotable rocker, marks the pivot axis of the rocker and, by support on a push-rod piece, transmits the actuating force acting on piece to the rocker. The supporting element is arranged between the rocker and the supporting surface of the push-rod so as to be displaceable transversely relative to the direction of exertion of the actuating force.

Abstract: A master cylinder apparatus for a vehicle is adapted to be attached to a bar type steering handle. This master cylinder apparatus comprises a master cylinder attached directly or via a bracket to the bar type steering handle, an operating level pivoted on the bracket or a lever bracket of the master cylinder by means of a support shaft, an adjust bolt provided thrustable forward and backward to the operating lever, and a push rod having one end abutting on the rear end of a piston in the master cylinder and the other end pivoted on a free end of the adjust bolt. The forward/backward thrusting movement of the adjust bolt alters the distance between the support shaft and the point of action of the operating lever to the push rod, thereby changing the lever ratio of the operating lever to provide the operational feeling desired by a rider.

Abstract: An actuating arrangement for a compact master cylinder includes a foot pedal pivotably connected to support bracket. The cylinder is pivotably connected at its lower end to the foot pedal and at its upper end to the bracket so that movement of the pedal causes movement of the piston into the cylinder and also moves the entire cylinder in relation to the supporting structure.

Abstract: A brake master cylinder and booster assembly for an automotive vehicle includes a brake pedal, a booster unit actuated by the brake pedal and having a power-boosted pushrod extending therefrom, a master cylinder unit located adjacent to the booster and having an actuator rod extending therefrom in a direction generally parallel to, but offset from, the booster pushrod, and a linkage operatively connecting the pushrod and the actuator rod so that movement of the brake pedal will be accompanied by power assisted movement of the master cylinder actuator rod.

Abstract: In a brake booster, a master brake cylinder is connected to a brake pedal via a piston rod, which acts upon a master cylinder piston by way of which at least one brake chamber can be put at brake pressure. In this way, servo fluid flows via brake lines to corresponding wheel brake cylinder is a servo chamber, which via a control element communicates with a device for supplying servo fluid to the servo chamber. This control element is controlled via a travel transducer that detects the motion of the piston rod. A lever arrangement is also connected to the piston rod, and on its other end is operatively connected to the travel transducer, which triggers the control element via an electronic unit to maintain the servo pressure.

Abstract: In a brake system having an auxiliary, booster or slave cylinder, the addition of a middle chamber between the forward and rear chambers of the master cylinder to increase the unit pressure (psi) and insure sufficient fluid volume to prevent failure of the system.

Abstract: A modular brake actuator useful in automotove vehicles includes a mounting base adapted to fit into a complementary opening in and form part of the fire wall between the engine compartment and the driver's cockpit. On one side of the mounting base there are assembled brake operating components and on the other side there are assembled hydraulic components. This module can be easily installed during assembly of the vehicle.

Abstract: A booster device for reducing the pedal force required to release the clutch on automotive vehicles. It is capable of either replacing the conventional clutch master cylinder (FIG. 4) or acting as an additional slave and master cylinder (FIGS. 1 to 3). An overcenter mechanism acts on the piston 4 intermediate its end to assist movement in opposite directions beyond a central point. To avoid unbalanced side loads, the overcenter mechanism includes two radially opposed spring (8) biased arms (5) the inner ends of which bear in cup-shaped recesses (6A) on opposite sides of a plug (6) sliding in a transverse bore through the piston (4).

Abstract: An automotive vehicle braking device comprises a hydraulic master cylinder (11) having at least one piston (21) for pressurization of the wheel cylinders connected thereto with hydraulic pressure and also having a vacuum brake force booster (12) inserted between the brake pedal (52) and the piston (21). The master cylinder (11) is integrated in the construction of the vacuum brake force booster (12).

Abstract: A pusher comprises a body with a plurality of piston holes provided on a front surface thereof, pistons slidably fitted to the piston holes and each having a front end extending in front of the body, an oil passage provided in the body and communicated with a bottom portion of each piston hole, a pressure chamber provided in the body and communicated with the oil passage, a threaded shaft threadably fitted to a threaded hole which is provided in the body and communicated with the pressure chamber, and oil filled in the bottom portion of each piston hole, the oil passage and the pressure chamber, where the piston is adapted to be pushed in front of the body by the threadable advancing of the threaded shaft at force larger than the advancing force of the threaded shaft.

Abstract: A hydraulic fluid system including a master cylinder (30) moved by a clutch pedal (34) for pressurizing a remotely located slave cylinder (50). The slave cylinder and master cylinder each including a rolling diaphragm (104, 176). The slave cylinder further including a cup-shaped piston (134) for isolating its rolling diaphragm from the rotation of a throw-out bearing (66) which is moved by the diaphragm.

Abstract: An actuator for variable adjustment of the pistons in hydraulic slave cylinders for regulation of for example the elevation adjustment of work stations. The pistons are actuated by way of a pusher which is non-rotatable but axially displaceable in the actuator housing (10). In the housing (10) there are provided one or more oblong openings (22) for drivers (27) attachable to the pusher and arranged for cooperation with the corresponding pusher in one or several further actuators placeable close to the actuator and that in at least one of the connected actuators there is arranged a threaded spindle for cooperation with a pusher designed as a nut.

Abstract: In order to accomplish the separation and further conveyance of the uppert sheet of a stack of sheets by the simplest possible means, an elastic friction finger resting with slight pressure on the uppermost sheet of the stack is provided, which is set into reciprocating motion in a direction (A-B) that is inclined by a certain angle (.alpha.) relative to the surface of the stack, the movement having a low amplitude and a relatively high frequency. The stack itself is inclined backward relative to the horizontal by a certain angle (.beta.). The drive of the friction finger may be effected by means of a bellows connected to a valveless pump, by a pneumatic cylinder, or by a crank drive. It is also possible to connect a pneumatic cylinder, provided with vent bores controlled by the piston, to a supply line that is at constant negative pressure or overpressure.

Abstract: The brake booster (12) includes a housing (30) with at least one piston (38) disposed in a bore (32) between a pressure chamber (42) and a work chamber (76). The piston (38) is disposed adjacent a valve housing (79) containing therein a valve assembly (80) and the valve assembly (80) is connected to an input assembly (72) at an end of the valve housing (79). The piston (38) includes a cam surface (78) engaged by a lever (17), the lever (17) abutting an actuator part (81) biased by a resilient spring (83) toward the lever (17). Actuation of the booster (12) effects a greater displacement of the piston (38) than the input assembly (72) and valve housing (79) because of the engagement of the lever with the cam surface (78) of the piston (38).

Abstract: A brake actuating master cylinder unit for bicycles and the like comprising a unit mountable upon the handlebars of a bicycle, a master cylinder having a piston mounted therewithin, a bellofram secured to the inner surface of the master cylinder at one end thereof and at the piston engaging closed end thereof secured to the piston by means of a plurality of projecting tits extending through complementary apertures in the piston. A snap ring preferably is used to positively secure the tits with the piston. A two-part piston rod is employed between the piston and the brake actuating handle to allow same to return to the normal, non-actuated position freely and without withdrawing the piston therealong. This two-part slidable connection permits positive actuation of the piston during braking operation, but yet permits free separation and non-positive return upon completion of the brake actuation.

Abstract: A actuating device for a vehicle, especially an automobile, in which an actuating device such as a hydraulic brake master cylinder and booster, is arranged to extend within an engine room at an angle to the longitudinal direction of the automobile body to fit in a restricted space and has its rear end portion protruding into the operator compartment. A pedal arm is supported on the rear end portion of said actuator by a hinge pin arranged in a plane substantially normal to the center line of the actuator, but is inclined with respect to a horizontal plane such that the moving locus of the foot pedal at the rear end of the pedal arm generally follows a longitudinal vertical plane to provide a normal motion for the operator's foot during movement.

Abstract: This invention relates to hydraulic master cylinder assemblies having a hydraulic master cylinder and an actuating mechanism and in particular to a hydraulic master cylinder assembly in which it is possible to alter the travel ratio between a driver operable actuating lever and a piston of the hydraulic master cylinder. The actuating mechanism includes a lever mechanism interposed between the actuating lever and the piston the effective lever arm length of which can be altered by means of an adjustable member forming part of the lever mechanism.

Abstract: A hydraulic driving system for motorcycle gear shift includes a primary cylinder combination, a secondary cylinder and a set of delivery conduits for handling hydraulic fluid connected therebetween, in which two primary cylinders with different diameters are oppositely formed in a hollow portion of a motorcycle handle and the two primary cylinders are respectively fluidically communicated with the secondary cylinder to reciprocatively and linearly move a gear rack and to drive the shaft of the gear shift by rotating a twist bar, formed on the handle, having an inclined-plane tongue alternatively actuating the two primary cylinders in the handle.

Abstract: A submersible pumping unit having a diaphragm pumping chamber connected to one end of an elongated tube, the interior of the tube being filled with hydraulic oil and a reciprocable solid of like density, the other end of the tube being connected to an oil chamber including a reciprocable piston for developing hydraulic pressure and flow oscillations at a predetermined frequency, wherein the hydraulic pressure and flow oscillations are transferred via the tube and the solid in the tube to the diaphragm pumping chamber for pumping the liquid in which the diaphragm pumping chamber is submersed.

Abstract: A powered, electromechanical manipulator assembly is disclosed which includes an electrically powered input device coupled by a hydraulic circuit to a mechanical manipulator. The hydraulic circuit is a fixed-volume, closed circuit in which a master piston-cylinder assembly is driven by a D.C. motor and is hydraulically coupled for direct and proportional displacement of a slave piston-cylinder assembly to enable smooth, accurate and easily connected displacement of a manipulator arm. The manipulator arm is formed of a plurality of modules each having a fixed-volume, closed, hydraulic circuit and a slave cylinder. Both the slave and master cylinders includes ambient pressure surfaces which are exposed to the water pressure at the operating depth of the assembly so that variation in depth does not materially affect the response or dexterity of the remote manipulator apparatus. An improved terminal module or jaw assembly is also disclosed.

Abstract: An improved system for finely and precisely controlling the operational position of a glass electrode, micropipette, micro surgical knife or the like with the aid of hydraulic remote control devices including hydraulic hoses is disclosed. This system includes a control stand with an actuator assembly firmly mounted thereon, said actuator assembly comprising X-, Y- and Z-coordinate actuators, a first fine adjusting device for roughly adjusting the X- and Y-coordinate actuators and a second fine adjusting device for adjusting the Z-coordinate actuator and moreover finely adjusting the X- and Y-coordinate actuators. A glass electrode or the like to be finely located is adjustably mounted on the actuator assembly.

Abstract: An improved pneumatic-hydraulic driving device for the knockout mechanism associated with the slide of a press-machine wherein the device serves to actuate the knockout mechanism in a controlled manner to provide cushioning motion during punching of the work, and knocking out motion after punching to permit removal of the punched work by a transfer machine, with the device being particularly useful in the fabrication of printed circuit plates wherein the device serves to decrease cycle-time of fabrication and increase quantity of production.

Abstract: A hand held manually operable hydraulic auxiliary device for lifting or pressing of loads or for operating of tools includes a hydraulic cylinder having pressure and activating pistons disposed between which is a valve housing including inlet and discharge channels and being furnished with non-return valves.The hydraulic cylinder including both the actuating piston operable by a manually operated lever, and the pressure piston, as well as the valve housing are disposed within an outer casing receiving the hydraulic fluid. The outer casing at least on the pressure piston side thereof is provided with a tool adapter. The valve members include a forced reset guide. Disposed in the area of the pressure side of the hydraulic cylinder is a randomly operable detent.

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 hydraulic master cylinder has pistons displaceable along the pivot axis of a brake pedal to apply the vehicle brakes. Motion between the pedal and the pistons is transmitted by balls located in a respective arcuate track formed partly in the pedal and partly in the respective piston. The master cylinder is particularly suitable for dual circuit brake systems. A master cylinder having a single piston is also disclosed.

Abstract: The present invention comprises an apparatus for producing high pressure fluid by means of a cylinder having a reciprocatingly sliding ram inside, suction and pressurization of the fluid being performed by the reciprocation of said ram. In the apparatus, an oil chamber is positioned on the intensifying side within said cylinder, and lubricating oil in said oil chamber is caused to have a pressure equivalent to that of the high pressure fluid produced. This oil pressure is transmitted to the slidable contact portions of the ram. The apparatus is capable of detecting the lack of lubricating oil, when such lack of lubricating oil occurs.

Abstract: A brake booster for automotive vehicles in which a seal is employed for assuring hermetic connection between an output rod and a housing having a cup-shaped portion. The seal includes an annular sealing member through which the output rod is passed slidably and hermetically and a retainer for positively supporting the sealing member. The retainer is provided with a plurality of hooks to engage the cup-shaped portion so that the annular sealing member will be brought at a bead portion thereof to hermetic abutment against the housing.

Abstract: This invention relates to hydraulic master cylinder assemblies having a hydraulic master cylinder and an actuating mechanism and in particular to a hydraulic master cylinder assembly in which it is possible to alter the travel ratio between a driver operable actuating lever and a piston of the hydraulic master cylinder. The actuating mechanism includes a lever mechanism interposed between the actuating lever and the piston the effective lever arm length of which can be altered by means of an adjustable member forming part of the lever mechanism.