Trailer brake fluid system including a mechanical lock

Claim 1

IN COMBINATION WITH A FLUID PRESSURE BRAKING SYSTEM WHICH INCLUDES A BRAKE ACTUATOR, A FLUID PRESSURE RELEASED, SPRING APPLIED BRAKE LOCKING MEANS FOR LOCKING THE ACTUATOR IN APPLIED POSITION, SERVICE AND LOCK PORTS IN SAID ACTUATOR, AN EMERGENCY RESERVOIR, A RELAY-EMERGENCY VALVE CONNECTED TO SAID RESERVOIR AND HAVING CONTROL, EMERGENCY AND OUTLET PORTS, EMERGENCY AND SERVICE LINES CONNECTED RESPECTIVELY TO SAID EMERGENCY AND CONTROL PORTS, AND FLUID CONDUIT MEANS INTERCONNECTING SAID OUTLET PORT AND THE SERVICE PORT OF SAID ACTUATOR, THE INVENTION WHICH COMPRISES A CONDUIT INTERCONNECTING SAID EMERGENCY LINE AND THE FLUID CONDUIT MEANS LEADING TO THE SERVICE PORT OF SAID ACTUATOR, A ONE WAY CHECK VALVE IN SAID CONDUIT ARRANGED TO PERMIT FLUID FLOW FROM SAID ACTUATOR TO SAID EMERGENCY LINE BUT NOT IN THE REVERSE DIRECTION, FIRST AND SECOND CHOKES SERIALLY ARRANGED IN SAID LAST NAMED CONDUIT BETWEEN SAID CHECK VALVE AND SAID EMERGENCY LINE, AND BRANCH CONDUIT MEANS HAVING ONE END CONNECTED TO SAID LAST NAMED CONDUIT BETWEEN SAID CHOKES AND THE OTHER END CONNECTED TO THE LOCK PORT OF SAID ACTUATOR.