Abstract: A regulator valve for a hydraulic anti-skid apparatus and which includes a housing provided with a first inlet port for connection to a fluid pump and the anti-skid apparatus, a second inlet port for connection to a master cylinder, and an outlet port for connection to a fluid reservoir, a regulator piston reciprocably disposed within the housing to form a first fluid chamber in open communication with the first inlet and outlet ports and a second fluid chamber in open communication with the second inlet port, and a spring loaded annular valve seat member arranged within the first fluid chamber to cooperate with a valve part of the piston so as to control the fluid flow from the first inlet port to the outlet port in response to the difference in pressure between the fluid chambers. A support member is arranged within the first fluid chamber formed therein with an axial bore in which a large diameter portion of the piston is slidably disposed to form a third annular fluid chamber.

Abstract: A hydraulic braking system having a master cylinder, a brake cylinder, a primary passage connecting the master and brake cylinder, a solenoid valve for selective communication of the brake cylinder with the master cylinder or with a reservoir, a pump for returning a brake fluid to the master cylinder, a shut-off valve disposed in the primary passage to prevent a flow of the fluid from the pump toward the master cylinder when the pump side pressure is higher than the master cylinder side pressure, an accumulator having a piston movable to define a variable volume chamber for storing the fluid under pressure, the braking system comprising a check valve in the primary passage between the master cylinder and the shut-off valve to inhibit a fluid flow therethrough in one direction from the master cylinder toward the shut-off valve, and further comprising a mechanism disposed between the accumulator and the check valve to hold a valve member of the check valve away from its seat to allow the fluid flow in the above

Abstract: A foot-operated device for controlling a parking brake wherein a parking brake pedal is locked in its operated position through engagement of a pawl member with ratchet teeth. The pawl member is pivotally connected to the brake pedal, and the ratchet teeth are formed on a bracket fixed to a vehicle frame. The parking brake is released when a pedal pad pivotally connected to the brake pedal is pivoted on the pedal and the pedal is depressed. The pedal pad has an extension arm protruding toward the pawl member which is biased by a spring device in a first direction to cause the pawl member to engage the ratchet teeth while the pedal pad is placed in its original position. The extension arm directly engages the spring device to change the biasing direction thereof from the first direction to a second direction so that the pawl disengages from the ratchet teeth when the pedal pad is pivoted to its operated position.

Abstract: A three-port solenoid-operated valve has a fluid passage defined in a solenoid, a first port at an inlet end of the fluid passage, and second and third ports at an outlet end of the fluid passage. A cylindrical plunger is movably disposed in the fluid passage, and a slider is slidably supported in the plunger. A first-port valve body is normally urged by a first spring to be held against an end surface of the slider for opening the first port when the solenoid is de-energized. A third-port valve body is normally urged by a second spring for closing the third port when the solenoid is de-energized and is energized by a lower current. A pusher is fixedly mounted in the plunger for pushing the third-port valve body in a direction to open the third port in response to movement of the plunger when the solenoid is energized by a higher current. A third spring acts between the pusher and the opposite end surface of the slider for normally urging the pusher and the slider apart from each other.

Abstract: An anti creep braking system for a vehicle. A force transmission member is drivingly coupled to a part of the brake pedal and transmits braking force to a braking force generation system. A braked member is selectively braked by a braking device, and is driven by the brake pedal with a one direction force transmission device being interposed on the path of transmission of force between the brake pedal and the braked member. The sense of force transmission of the one direction force transmission device is such that, when the movement of the braked member with respect to the vehicle is prevented by the braking device, the brake pedal may be further depressed to increase vehicle braking action without transmitting substantial force to the braked member, but may not be moved backwards to reduce vehicle braking action.

Abstract: A regulator valve for a hydraulic anti-skid apparatus, in which a first valve member in the form of a piston is reciprocable within a housing for the regulator valve and subdivides the interior of the housing into first and second chambers arranged to be respectively applied with a hydraulic power pressure from a fluid pump and a master cylinder pressure from a master cylinder, the first valve member being formed at its one end with a valve part exposed within the first chamber, and in which a second annular valve member is arranged in the first chamber coaxially with the first valve member and is formed at its one end with a first small diameter valve part cooperating with the valve part of the first valve member to form a first annular throttle for throttling the fluid flow from the pump to a fluid reservoir through the first chamber and at its other end with a second large diameter valve part cooperating with the inner end wall of the first chamber to form a second annular throttle for throttling the fluid