Vacuum brake control equipment for multiple unit locomotives

Claim 1

IN A MULTIPLE UNIT LOCOMOTIVE VACUUM BRAKE CONTROL SYSTEM OF THE TYPE HAVING ON EACH LOCOMOTIVE UNIT AN EXHAUSTER FOR EVACUATING A CORRESPONDING STORAGE RESERVOIR, THE COMBINATION ON EACH ONE OF THE LOCOMOTIVE UNITS OF: (A) A STORAGE RESERVOIR EVACUATED TO A SUBATMOSPHERIC PRESSURE BY THE CORRESPONDING ECHAUSTER, (B) A FLUID PRESSURE BRAKE PIPE NORMALLY CHARGED TO A CERTAIN SUPER-ATMOSPHERIC PRESSURE, (C) A VACUUM BRAKE PIPE NORMALLY EVACUATED TO A CERTAIN SUBATMOSPHERIC PRESSURE, (D) A COMMUNICATION EXTENDING BETWEEN THE STORAGE RESERVOIR ON THE UNIT AND SAID VACUUM BRAKE PIPE, (E) A FIRST FLUID PRESSURE OPERATED VALVE MEANS DISPOSED IN SAID COMMUNICATIN ADJACENT SAID STORAGE RESERVOIR AND HAVING AN OPEN AND A CLOSED POSITION FOR CONTROLLING EVACUATION OF FLUID UNDER PRESSURE FROM SAID VACUUM BRAKE PIPE THROUGH SAID COMMUNICATION, (F) A SECOND FLUID PRESSURE OPERATED VALVE MEANS DISPOSED IN SAID COMMUNICATION ON THE SIDE OF SAID FIRST FLUID PRESSURE OPERATED VALVE MEANS OPPOSITE THE STORAGE RESERVOIR, FOR CONTROLLING THE DEGREE OF SUBATMOSPHRIC PRESSURE IN THE VACUUM BRAKE PIPE, SAID SECOND FLUID PRESSURE OPERATED VALVE MEANS BEING CONTROLLED ACCORDING TO THE RELATION OF THE PRESSURES IN SAID FLUID PRESURE BRAKE PIPE AND SAID VACUUM BRAKE PIPE TO AT ONE TIME CUT OFF SAID STORAGE RESERVOIR FROM THE PIPE TO ATMOSPHERE AND AT ANOTHER TIME OPEN THE PIPE TO ATMOSPHERE AND AT ANOTHER TIME OPEN THE SAID COMMUNICATION THERETHROUGH TO THE STORAGE RESERVOIR, (G) A THIRD FLUID PRESSURE OPERATED VALVE MEANS DISPOSED IN SAID COMMUNICATION BETWEEN SAID SECOND FLUID PRESSURE OPERATED VALVE MEANS AND SAID VACUUM BRAKE PIPE AND HAVING AN OPEN AND A CLOSED POSITION FOR CONTROLLING EVACUATION OF FLUID UNDER PRESSURE FROM SAID VACUUM BRAKE PIPE THROUGH SAID COMMUNICATION, (H) A SOURCE OF FLUID UNDER PRESSURE ON THE UNIT, (I) A TWO-POSITION MANUALLY OPERABLE CHANGE-OVER VALVE DEVICE OPERABLE TO ONE POSITION WHEN THE UNIT IS THE LEAD UNIT IN MULTIPLE UNIT OPERATION TO EFFECT THE CONSTANT SUPPLY OF FLUID UNDER PRESSURE FROM SAID SOURCE OF FLUID UNDER PRESSURE TO SAID THIRD FLUID PRESSURE OPERATED VALVE MEANS TO MAINTAIN IT IN ITS OPEN POSITION, SAID CHANGE-OVER VALVE DEVICE BEING MANUALLY OPERABLE TO THE OTHER OF ITS TWO POSITIONS WHEN THE UNIT IS A TRAILING UNIT IN MULTIPLE UNIT OPERATION TO ESTABLISH A COMMUNICATION BETWEEN SAID THIRD FLUID PRESSURE OPEATED VALVE MEANS AND ATMOSPHERE TO CAUSE SAID THIRD FLUID PRESSURE OPERATED VALVE MEANS TO MOVE TO ITS CLOSED POSITION TO CUT OFF EVACUATION OF SAID VACUUM BRAKE PIPE THROUGH THE SAID COMMUNICATION ON THE CORRESPONDING UNIT, AND (J) A FLUID PRESSURE OPERATED VALVE DEVICE OPERABLE ONLY SO LONG AS THE PRESSURE IN SAID FLUID PRESSURE BRAKE PIPES ITS INCREASING TO EFFECT THE SUPPLY OF FLUID UNDER PRESSURE FROM SAID FLUID PRESSURE BRAKE PIPE TO SAID FIRST AND SAID THIRD FLUID PRESSURE BRAKE PIPE TO SAID FIRST CAUSE THE OPERATION THEREOF TO THEIR OPEN POSITION WHEREBY SAID FIRST, SAID SECOND AND SAID THIRD FLUID PRESSURE OPERATED VALVE MEANS OPERATE CONCURRENTLY TO OPEN SAID COMMUNICATION, NOTWITHSTANDING SAID TWO-POSITION MANUALLY OPERABLE CHANGE-OVER VALVE DEVICE ON A TRAILING UNIT BEING IN ITS SAID OTHER POSITION, TO ENABLE THE EXHAUSTER ON A TRAILING UNIT TO ASSIST THE EXHAUSTER ON A LEADING UNIT IN EVACUATING PIPE IS SUBSTANTIALLY COMPLETELY CHARGED TO THE NORMALLY CHARGED PRESSURE CARRIED THEREIN.