Abstract: In a self-lapping type control valve device, a check valve is provided by means of a seal at the interface of the control piston diaphragm and a recess in which the diaphragm is connected to the valve body, the seal being effective to isolate a control chamber on one side of the control piston from a constant pressure chamber on the opposite side when the control piston is actuated in response to a reduction in the control chamber fluid pressure to initiate a brake application. This seal is displaced from a ridge at the opening of the recess with which the diaphragm is also engageable when actuation of the control piston occurs in response to a relatively large reduction of the control chamber pressure.

Abstract: An air dryer unit includes an air storage tank including an elongated hollow body of a one-piece construction having a partition wall disposed therewithin to divide the interior of the tank body into a first chamber and a second chamber in an air-tight manner. The second chamber has an outlet connectable to a pneumatic circuit. An opening is formed through that portion of the tank body defining the first chamber. An air dryer device includes a dryer including a tubular housing containing a desiccant and extending through the opening into the first chamber, and a hollow cover member detachably coupled to the dryer housing to cover that portion of the dryer housing extending outwardly through the opening. The cover member is detachably coupled to outer surface of the tank body and has an inlet connectable to an air compressor. One end of the dryer housing disposed in the first chamber communicates with the first chamber while the other end communicates with the cover member.

Abstract: A pull-type pneumatic booster comprises an elongated plunger received in a body for sliding movement along an axis thereof. A movable member is slidably received in the body and defines a low and a high pressure chamber therein. The high pressure chamber is controlled by a valve device to communicate with either of the low pressure chamber and a high pressure source in accordance with the movement of the plunger. One end portion of the plunger extends beyond the movable member into the low pressure chamber. The plunger has the other end portion of a tubular configuration. The front and rear end portions of the plunger are snugly fitted in and disposed in sliding contact with an inner surface of a tubular portion the movable member for guiding the movement of the plunger along the axis of the body. A load-transmitting means is received in the tubular rear end portion of the plunger for transmitting a reaction force applied to the output member to the input member via the plunger.

Abstract: A brake control system for a railway car having a primary electric brake and a secondary friction brake that supplements the electric brake as the electric brake effectiveness fades. The secondary friction brake is normally applied in accordance with a first supplementary control signal provided by an electrical component, such as an operational amplifier, the output of which is the difference between a brake command signal and the actual braking produced by the electric brake. A second supplementary control signal corresponding to the brake command signal is effective to control the secondary friction brake, in response to either anomalies in the power supply or failure of the operational amplifier. A switch connects the brake command signal to an electric-pneumatic converter to provide pneumatic pressure to the friction brake corresponding to the brake command, and to concurrently terminate operation of the electric brake, when either one or both of the foregoing abnormalities are detected.

Abstract: A railway vehicle brake control system in which a fluid pressure brake continuously supplements the electric brake as the electric brake effectiveness fades during vehicle slowdown. An amplifier circuit output signal corresponding to the electric brake effectiveness is modified by adjusting the amplifier gain in response to a detector sensing the initial drop in the electric brake effectiveness. This modified amplifer output signal is subtracted from a brake command signal to obtain a difference signal, the value of which establishes the amount of fluid pressure braking necessary to supplement the electric brake deficiency. The arrangement compensates for hysteresis and response delay in the pneumatic valving required in the fluid pressure brake system, such that the total brake obtained corresponds substantially to the brake command both during and following transition from the electric brake to the fluid pressure brake.

Abstract: A jerk controlled brake system having a malfunction detecting arrangement for suppressing a malfunction signal due to a normal difference between the jerk control circuit input brake command and the output jerk modified command signal for a time period at least sufficient to allow the delayed jerk modified command signal to match the input brake command signal. The timer circuit controlling this time period is resettable prior to expiration of the preset time period to provide an extended time period, when the brake command signal is repeatedly changed at time intervals less than the preset time period.

Abstract: A hydraulic reservoir with fluid level detector includes a main body having an internal space for containing brake oil; a cap attached to the main body for covering a top opening of the main body; a diaphragm arranged across the top opening of the main body, the outer circumference of the diaphragm being held between the main body and the cap, and the space between the cap and the diaphragm communicating with the atmosphere; a reed switch fixed to the main body, a float provided with permanent magnet, so arranged as to be vertically movable in the internal space of the main body, the reed switch and the float with permanent magnet constituting a fluid level detector, and when the float with permanent magnet is positioned under a predetermined level, the reed switch being closed by magnetic force of the permanent magnet; an operating rod for pushing down the float, being vertically movable and able to be pushed down from the external against buoyancy of the float; and a cylindrical portion integrally formed wi

Abstract: A compound electropneumatic brake control system which has a compound brake power command controller for controlling an electric brake system and a fluid brake system on motor cars and trailer cars. A plurality of motor and trailer car weight setters and a plurality of signal summing networks which cause any brake deficiency is either supplemented by both the fluid brake systems on the motor cars and trailer cars or is initially supplemented by the fluid brake system on the trailer cars and then is subsequently supplemented by the fluid brake system on the motor cars.

Abstract: A hydraulic reservoir in a tandem master cylinder includes a main portion defining a fluid reservoir chamber for reserving brake fluid, two fluid supply portions defining fluid paths under the main portion, the fluid supply portions being contiguous with the main portion and an opening formed at the top, the two fluid supply portions being connected to two fluid connection portions of a tandem master cylinder body.

Abstract: Disclosed is a brake device constructed to supply a pressure fluid from a pressure source to brake actuating devices of the wheels of a vehicle. The brake device includes a brake retainer valve which has a valve element arranged in a valve chamber and a valve seat on which the valve element is seated and unseated. In the brake device, when on an upward slope the brake pedal and the clutch pedal are depressed. Sequentially, the pressure fluid is not released from the brake actuating devices to the pressure source by seating the valve element on the valve seat in spite of returning the brake pedal, and the pressure fluid is released by removal of the valve element from the valve seat by returning the clutch pedal. In the brake retainer valve, a solenoid is provided, which is connected to the device for detecting the backward driving of the vehicle to prevent seating of the valve element on the valve seat by attracting the valve element away from the valve seat.

Abstract: A device for automatically opening and closing a hinged door includes a motor having a drive shaft, a speed reducer, an operating shaft adapted to be connected to the hinged door and operatively coupled through the speed reducer to the drive shaft, a chain sprocket fixed to the operating shaft, a chain trained in mesh around the chain sprocket, a first rod having an end coupled to an end of the chain, with a first fixed to an opposite end of the first rod, a second rod having an end coupled to an opposite end of the chain, with a second flange fixed to an opposite end of the second rod, a first tubular body in which the first rod is axially movably disposed, a first spring disposed around the first rod within the first tubular body for normally urging the first flange in a direction away from the chain sprocket, a second tubular body in which the second rod is axially movably disposed, and a second spring disposed around the second rod within the second tubular body for normally urging the second flange in a

Abstract: A load compensating valve for a compressed air brake system for railroad vehicles having air spring devices. The load compensation valve includes a supply chamber and an output chamber which are interconnected by a supply valve and an exhaust valve. A balance piston responsive to air spring pressure for controlling the pressure in the output chamber. A check valve disposed in parallel with the supply valve to allow the output chamber to discharge when the supply chamber is exhausted.

Abstract: A load responsive valve for the braking of vehicles having load supporting air springs. The air spring pressure is employed to regulate the brake pressure through conventional proportioning-type valving. A pilot valve senses the application and release of the vehicle brakes in order to nullify operation of the air spring operated control piston so long as the brake is released, in order to reduce component wear and air consumption due to valve oscillation resulting from air spring pressure variation as the car jounces in service. This is accomplished by pilot pressure supplied via the pilot valve to counteract the air spring pressure acting on the control piston. During a brake application, the pilot valve exhausts this pilot pressure to permit the air spring pressure to operate the control valve in a normal manner.

Abstract: A pneumatic booster includes a movable wall mounted in a hollow body to divide the interior of the body into a low pressure chamber and a high pressure chamber, the movable wall having an internal bore extending therethrough. An input member is movably received in the bore and carries a plunger. A valve member is selectively engageable with a first valve seat formed on the plunger and a second valve seat formed on the surface of the bore for controlling a pressure differential between the low and high pressure chambers. At least one pin slidably extends through the movable wall and is engageable with a rear wall of the body for allowing the movable wall to move rearwardly relative to the pin. An operating member has a tubular portion slidably received in the bore and is connected to the pin for movement therewith. An output member and a load-transmitting member for transmitting a load to the output member in response to a forward movement of the input member are received in the tubular portion.

Abstract: An air dryer device for drying compressed air includes a housing having an inlet port and an outlet port. An elongated desiccant container is mounted within the housing and holding a desiccant therein. One end of the desiccant container communicates with the inlet port while the other end communicates with the outlet port, so that the compressed air fed to the inlet port is passed through the desiccant container to be dried and is discharged from the outlet port. At least part of the desiccant container is transparent. An inspection window is mounted on the housing in opposed relation to the transparent part of the desiccant container so that the desiccant in the desiccant container can be viewed from outside the housing through the inspection window and the transparent part of the desiccant container.

Abstract: Each of two valves disposed in a housing is constructed as a unit which comprises a casing in which substantially all essential parts of the valve are housed, and a plug member removably connected to the casing for retaining the parts in the casing. The valve comprises a valve body movably disposed in the casing, a piston slidably disposed in the casing and movable in fore-and-aft directions in response to application of hydraulic pressure thereto to open and close, in cooperation with the valve body, the communication between inlet and outlet ports of the valve, and a valve seat mounted to the piston for assuring the communication open end close function achieved by the valve body and the piston, wherein the valve seat has a configuration which affects the characteristics of the piston, and the valve seat is removably connected to the piston.

Abstract: An air dryer device for a compressed air system of a vehicle includes a housing and a dryer mounted within the housing and containing a desiccant for drying compressed air from a compressor of the compressed air system. A drain valve is mounted within the housing and includes a valve body having a valve port and a valve seat. A hollow elongated control piston is mounted within the valve body for movement along an axis thereof. A valve element is mounted on the control piston and is normally urged into sealing engagement with the valve seat to close the valve port. The control piston is responsive to a pneumatic signal from an air governor of the compressed air system for being moved along its axis to bring the valve element out of sealing engagement with the valve seat to open the drain valve. An elongated heater member is mounted at one end on the valve body for generating heat. The heater member is received in an axial bore of the control piston.

Abstract: In a brake control apparatus which comprises two brake systems for supplying pressurized fluid from a brake master cylinder to brake wheel cylinders through conduit systems independent from each other, one of said two brake systems including a first brake control valve which is able to check the fluid flow towards said brake master cylinder from one of said brake wheel cylinders on detecting an inclined roadway, and is able to open and close in accordance with clutch operation, another of said two brake systems includes a second brake control valve which is able to check the fluid flow towards said brake master cylinder from another of said brake wheel cylinders to response to operation of said first brake control valve.

Abstract: A fluid pressure device for detecting two or more fluid pressure levels from a varied range of fluid pressure includes a housing having a cylindrical bore and a pressure inlet in communication therewith. A piston member is reciprocably movable within the cylindrical bore. A piston rod extends from the piston member and projects outward of the housing where a switch-operating arrangement is secured. The switch-operating arrangement includes an interlocking arm and a number of blocking elements corresponding to the number of switch devices to be operated. Guide slots formed in the interlocking arm allow adjustment of the position of the blocking elements, thus affecting a change in the operating points of the switch devices. Surrounding the piston rod within the housing is a multiple-spring arrangement which opposes the movement of the piston and which exhibits a nonlinear spring coefficient.

Abstract: A memory system of wheel speed of a vehicle with skid control system includes a wheel speed sensor associated with the wheel; a skid control unit measuring the skid condition of the wheel on the basis of the output signal of the wheel speed sensor and generating a control signal for controlling the brake fluid pressure to the brake of the wheel; a wheel speed signal generator connected to the wheel speed sensor for generating a wheel speed signal having analogue or digital value proportional to the rotational speed of the wheel; a memory device for memorizing the wheel speed signal from the wheel speed signal generator; a switch device arranged between the wheel speed signal generator and the memory device for controlling the transmission of the wheel speed signal to the memory device; and a brake operation signal generator for generating a brake operation signal when the vehicle is braked, the brake operation signal and the control signal of the skid control unit being supplied to the switch device; and the