Brake installations for trailers

Claim 1

IN A BRAKING INSTALLATION FOR A TRAILER WHICH IS ADAPTED TO BE HAULED BY A MOTOR TRUCK, IN COMBINATION, A PLURALITY OF PNEUMATIC BRAKE MEANS AND SPRING BRAKE MEANS ADAPTED TO BRAKE WHEELS OF THE TRAILER; CONTROL VALVE MEANS; FILLING AND BRAKE LINES SITUATED UPSTREAM OF AND COMMUNICATING WITH SAID CONTROL VALVE MEANS, SAID FILLING LINE BEING ADAPTED TO COMMUNICATE WITH A SOURCE OF COMPRESSED AIR AT THE MOTOR TRUCK AND SAID BRAKE LINE BEING ADAPTED TO TRANSMIT PRESSURE CHANGES RESULTING FROM OPERATION OF BRAKES OF THE MOTOR TRUCK; A COMPRESSED AIR TANK CARRIED BY THE TRAILER, SAID TANK COMMUNICATING WITH SAID CONTROL VALVE MEANS; PNEUMATIC BRAKE CONDUIT MEANS COMMUNICATING WITH SAID PLURALITY OF PNEUMATIC BRAKE MEANS AND SITUATED DOWNSTREAM OF AND COMMUNICATING WITH SAID CONTROL VALVE MEANS, SAID CONTROL VALVE MEANS MAINTAINING COMPRESSED AIR IN SAID TANK AT A PRESSURE DETERMINED BY THE PRESSURE OF COMPRESSED AIR IN SAID FILLING LINE AND SAID CONTROL VALVE MEANS RESPONDING TO PRESSURE CHANGES IN SAID BRAKE LINE FOR APPLYING TO SAID PLURALITY OF PNEUMATIC BRAKE MEANS COMPRESSED AIR FROM SAID TANK TO APPLY THE PNEUMATIC BRAKE MEANS FOR RETARDING THE MOVEMENT OF THE TRAILER; SPRING BRAKE CONDUIT MEANS COMMUINICATING WITH SAID SPRING BRAKE MEANS AND WITH SAID FILLING LINE UPSTREAM OF SAID CONROL VALVE MEANS SO THAT THE COMPRESSED AIR FLOWS FROM SAID FILLING LINE DIRECTLY TO SAID SPRING BRAKE MEANS AND SAID SPRING BRAKE MEANS RESPOMDING TO THE PRESSURE OF THE COMPRESSED AIR DERIVED FROM THE FILLING LINE FOR REMAINING IN AN INOPERATIVE, NON-BRAKING POSITION, WHILE WHEN SAID SPRING BRAKE CONDUIT MEANS IS AT ATMOSPHERIC PRESSURE SAID SPRING BRAKE MEANS AUTOMATICALLY RESPONDS TO APPLY ITS BRAKING FORCE TO THE TRAILER FOR RETARDING THE MOVEMENT THEREOFF AND FLOW CONTROL MEANS COMMUNICATING WITH SAID TANK AND CONNECTED INTO SAID SPRING BRAKE CONDUIT MEANS AND DIVIDING THE LATTER INTO AN UPSTREAM PORTION EXTENDING FROM SAID FLOW CONTROL MEANS TO SAID FILLING LINE AND A DOWNSTREAM PORTION EXTENDING FROM SAID FLOW CONTROL MEANS TO SAID SPRING BRAKE MEANS, SAID FLOW CONTROL MEANS AUTOMATICALLY PLACING SAID DOWNSTREAM PORTION OF SAID SPRING BRAKE CONDUIT MEANS IN COMMUNICATING WITH THE OUTER ATMOSPHERE WHEN THE PRESSURE OF THE AIR IN SAID TANK FALLS BELOW A PREDETERMINED VALUE, SO THAT SAID SPRING BRAKE MEANS WILL BECOME OPERATIVE TO RETARD MOVEMENT OF THE TRAILER WHEN THE PRESSURE IN SAID TANK IS BELOW SAID VALUE.