Abstract: A fast-fill braking system in one embodiment includes a master cylinder, a first chamber within the master cylinder, a second chamber within the master cylinder located forward of the first chamber, a fast-fill piston within the first chamber, a primary piston within the first chamber and movable with respect to the fast-fill piston, and a secondary piston within the second chamber.

Abstract: A brake cylinder means (1) for a motor vehicle, comprises a cylinder/piston means (2) adapted to be operated by a brake pedal means for generating pressure in a hydraulic brake system of the motor vehicle, characterized in that the cylinder/piston means (2) is provided in an outer cylinder means (3) in an axially movable manner, a spring means is provided to resiliantly bias said cylinder/piston means (2) against said outer cylinder (3), in an normal actuation position said cylinder (2a) of said cylinder/piston means (2) being essentially non-movable with respect to the piston (2b) of said cylinder/piston means (2), such that the cylinder/piston means (2) being movable against the spring forces of said spring means (4) in said outer cylinder (3).

Abstract: A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100). The pneumatic booster (100) is capable of being operated by an operating rod (28) controlling the opening of a valve (26) in order to actuate a main hydraulic piston (34) in the master cylinder (200). The booster (100) has a rigid casing (10) divided in a leaktight fashion into first (12) and second (14) chambers by a moving partition (16) capable of driving a pneumatic piston (22) which can move relative to the casing (10). The main hydraulic piston (34) includes a hollow moving cylinder (38) having a secondary piston (40) which slides in a leaktight fashion in the interior thereof.

Abstract: An actuating unit for a hydraulic brake system for automotive vehicles which operates by a precisely defined change-over pressure and with lost travel independent of the speed of actuation. The actuating unit includes a pneumatic brake power booster and a master brake cylinder connected downstream of the pneumatic brake power booster. The master brake cylinder contains a primary piston coupled with an annular piston of larger diameter. The annular piston confines a filling chamber which may be connected to the hydraulic pressure chamber. The annular piston is adapted to uncouple from the primary piston when the pressure acting on the annular piston reaches a predetermined amount. Thus, the displacement of the filling volume by the annular piston does not require an entire stroke of the master brake cylinder.

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: 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 dual-piston hydraulic brake master cylinder includes a large hydraulic piston which supplies an initial large brake fluid volume and a small hydraulic piston which continues to supply brake fluid to the brakes when the large piston stops moving forward in its cylinder at higher brake pressures. The small, central hydraulic piston is connected to the end of a piston rod extension of a pneumatic booster piston. The large piston surrounds the small piston and opens a reservoir line tilt-valve in the piston retracted position. A passageway between the large and small hydraulic chambers is open in the retracted position to allow communication of braking fluid therebetween. During brake actuation a seal arrangement interrupts this communication. The large and small hydraulic chambers supply the brake circuits through delivery passages.

Abstract: The brake booster (12) includes a housing (30) with at least one piston (38) disposed in a bore (32) to separate a pressure chamber (42) from a work chamber (76). The piston (38) engages a valve housing (79) containing therein a valve assembly (80) and the valve assembly (80) is connected to an input assembly (72) abutting the other end of the valve housing (79). The piston (38) is disposed within an extension (81) of the valve housing (79) and a seal (87) and spring (89) are disposed between the piston (38) and valve housing (79) so as to enhance initial movement of the piston (38) and provide a quick take-up and fast fill that compensates for fluid losses in the system while maintaining a reduced stroke for brake pedal travel.

Abstract: The present invention starts from a vehicle hydraulic brake system comprising a master cylinder (2) actuatable by a hydraulic power booster (1) and containing a working chamber (12, 21), to which latter wheel brakes (36, 37, 38, 39) are connected by way of valves (40, 41) controllable by a slip control electronics. On control action, pressure fluid can be taken from the wheel brakes (36, 37, 38, 39) through the valves (40, 41) and can be replenished out of the presser chamber (5) of the hydraulic power booster (1) by way of the working chamber of the hydraulic power booster by way of the working chamber (12, 21). On communication of the working chamber (12, 21) with the pressure chamber (5) of the hydraulic power booster (1), simultaneously, a resetting sleeve (11) is pressurized in the brake's release direction which is penetrated by a master cylinder piston (10) and which serves to limit the stroke of the brake pedal (6).

Abstract: A two-stage, hydro-pneumatic actuator suitable for use as a railway vehicle brake. The hydraulic cylinder comprises a large diameter bore in which a low- and a high-pressure piston operate jointly during a first stage of operation to effect a high volumetric displacement of hydraulic fluid via a small diameter bore in order to take up the clearance between the brake shoes and wheel. As the brake shoes contact the wheel, the high-pressure piston enters the small bore to interrupt further displacement of hydraulic fluid from the large bore. The force of the high-pressure piston alone during this second stage of operation produces the required brake forces with a high multiplication factor. Make-up fluid is drawn into a chamber on the backside of the low-pressure piston during a brake application stroke an amount corresponding to the over-travel of the high-pressure piston and is subsequently discharged into the hydraulic cylinder during retraction of the brakes to compensate for brake shoe wear.

Abstract: A brake master cylinder assembly comprising a cylinder body having a stepped axial bore with large and small diameter portions, a tubular piston slidably disposed in the large diameter portion, and a primary piston one end being slidably disposed in the tubular piston and the other end in the small diameter portion, the primary piston being operatively connected to the brake pedal. The other end of the primary piston defines a pressure chamber in the small diameter portion in communication with the brakes. The primary and tubular pistons define an annular pressure chamber in the large diameter portion. Actuator means indirectly responsive to movement of the brake pedal moves the tubular piston to create low pressure in the annular pressure chamber which is in restricted fluid communication with the pressure chamber providing braking pressure at idle with reduced force on the brake pedal required.

Abstract: A compound master brake cylinder assembly (10) for a braking system, the cylinder assembly having a reservoir (34), a first low pressure cylinder (72), and a removable high pressure cylinder (58). A relief valve (84) is provided with a poppet valve (104) normally biased to a closed position. The relief valve (84) extends between the low pressure cylinder (72) and reservoir (34) and is responsive to first cylinder (72) pressure and outlet pressure through pilot passageways (114 and 111, respectively) to vent fluid from cylinder (72) to reservoir (34) to progressively reduce the pressure in the cylinder to insure that the force applied by push rod (14) does not substantially vary while cylinder (72) pressure is being reduced after outlet pressure exceeds a predetermined position.

Abstract: The present invention relates to an apparatus for transferring a pasty matter for filling a hollow body.This apparatus comprises a cylindrical bowl in which the pasty matter to be transferred is placed and of which the bottom is extended by an axial tube open at its two ends, a push member being engageable in the bowl to push the pasty matter towards and in the axial tube, this push member having an outer diameter substantially equal to the inner diameter of the bowl and having an axial bore passing therethrough and a piston constituted by a rod of diameter equal to the inner diameter of the axial tube extending the bowl, housed and slidable in the axial bore of the push member to be engaged in the axial tube of the bowl and empty this tube of the pasty matter that it contains.

Abstract: A two-stage intensifier system for use in conjunction with a pressure-operable swing clamp or other pressure-operable device for supplying fluid pressure at a relatively low pressure to perform a first operation and thereafter to supply fluid pressure at a higher pressure to perform a second operation.

Abstract: A master cylinder includes a master cylinder piston which is slidable by a booster with a hydraulic transmission interposed between the booster and the master cylinder piston. The booster includes two booster pistons the first of which has the same effective area as the master cylinder piston. With the system intact, the master cylinder piston is shifted as a result of the pressure fluid displaced by the two booster pistons to provide the hydraulic transmission. In the event of failure of the booster, the master cylinder piston is actuated directly by mechanical means through the first booster piston with the hydraulic transmission thereby being omitted.

Abstract: A servo brake system with at least two circuits, equipped with a tandem master cylinder, in which two working pistons are arranged coaxially one behind the other; a transmission shifting device thereby automatically shifts in case of failure of the servo installation to a larger pedal travel with a mechanically applied brake pressure that is reduced within permissive limits; the working piston of the actuating side thereby includes a bore coaxial to the other working piston, in which a plunger piston is guided which is actuatable by the input piston.

Abstract: An auxiliary compensating piston in a tandem automotive master cylinder containing two pressure pistons closes relief port holes between the cylinder and brake fluid reservoirs. A compensating valve feeds replacement fluid into the cylinder during brake release. The auxiliary compensating piston opens the relief port holes at the end of brake release to relieve excess brake fluid from the cylinder.

Abstract: The invention relates to a servomotor for assisting the operation of a power brake system. The servomotor includes in a housing a power-assisting part and a part forming a hydraulic master-cylinder. The power-assisting part is adapted in use to be connected to an external power source such as a vacuum source. A valve assembly operated by an operator-operated intake member controls the generation of a pressure differential across a driving piston by allowing air to replace the vacuum on one side of the piston. The master-cylinder part includes an assembly having two coaxial pistons. The first piston is attached to the driving piston of the power assist part whereas the second piston is actuated by the intake member. Both coaxial pistons project into a chamber which is divided by a sealing ring. The central piston is adapted to pass through the sealing ring in response to an input force from the input member to further pressurize the fluid in the outlet portion of the chamber.