Combined electro-pneumatic and pneumatic brake system for railway trains

Claim 1

AN ELECTRO-PNEUMATIC BRAKE CONTROL EQUIPMENT FOR A RAILWAY CAR, COMPRISING: (A) A NORMALLY CHARGED BRAKE PIPE REDUCTION OF PRESSURE IN WHICH IS EFFECTIVE TO PRODUCE A BRAKE APPLICATION, (B) A NORMALLY ENERGIZED APPLICATION WIRE, (C) AN APPLICATION MAGNET VALVE DEVICE CONNECTED TO SAID APPLICATION WIRE, SAID APPLICATION MAGNET VALVE DEVICE BEING OPERABLE WHEN ENERGIZED TO ESTABLISH A FIRST FLUID PRESSURE COMMUNICATION BETWEEN A FIRST CHAMBER CONNECTED TO SAID BRAKE PIPE AND A SECOND CHAMBER AND OPERABLE WHEN DEENERGIZED TO CLOSE SAID FIRST COMMUNICATION AND TO ESTABLISH A RESTRICTED COMMUNICATION BETWEEN SAID SECOND CHAMBER AND ATMOSPHERE, (D) A NORMALLY OPEN CUT-OUT VALVE DEVICE COMPRISING: (I) A PISTON NORMALLY SUBJECTED ON ONE SIDE TO FLUID UNDER PRESSURE SUPPLIED FROM SAID BRAKE PIPE VIA SAID FIRST COMMUNICATION AND ON THE OPPOSITE SIDE TO ATMOSPHERIC PRESSURE, (II) A VALVE OPERABLY CONNECTED TO SAID PISTON FOR ALSO CONTROLLING FLOW OF FLUID UNDER PRESSURE FROM SAID BRAKE PIPE TO SAID SECOND CHAMBER OF SAID APPLICATION MAGNET VALVE DEVICE AND SAID ONE SIDE OF SAID PISTON, AND (III) SPRING MEANS BIASING SAID VALVE IN ONE DIRECTION TO A CLOSED POSITION IN OPPOSITION TO FLUID UNDER PRESSURE ACTING ON SAID ONE SIDE OF SAID PISTON TO BIAS SAID VALVE IN THE OPPOSITE DIRECTION TO AN OPEN POSITION, (F) SAID APPLICATION MAGNET VALVE DEVICE BEING OPERABLE UPON DEENERGIZATION OF SAID APPLICATION WIRE TO ESTABLISH SAID RESTRICTED COMMUNICATION WHEREBY FLUID UNDER PRESSURE IS VENTED SIMULTANEOUSLY FROM SAID BRAKE PIPE VIA SAID OPEN VALVE AND FROM SAID ONE SIDE OF SAID PISTON TO EFFECT A BRAKE APPLICATION PNEUMATICALLY, AND (G) SAID SPRING MEANS BEING EFFECTIVE TO CLOSE SAID VALVE AFTER A PREDETERMINED TIME INTERVAL IN RESPONSE TO A CHOSEN REDUCTION IN PRESSURE ON SAID ONE SIDE OF SAID PISTON TO TERMINATE FURTHER REDUCTION IN PRESSURE IN SAID BRAKE PIPE THEREBY INSURING AN APPLICATION OF BRAKES TO A CHOSEN DEGREE.