Lift system for cargo containers

Claim 1

IN COMBINATION WITH A CARGO CONTAINER ADAPTED FOR MOUNTING ON A MOVABLE VEHICLE, A LIFTING SYSTEM COMPRISING; A PLURALITY OF LIFT RAMS, MEANS FOR DETACHABLY CONNECTING SAID RAMS TO THE CONTAINER FOR RAISING AND LOWERING THE SAME, A SOURCE OF FLUID PRESSURE, CONDUIT MEANS FOR CONNECTING SAID SOURCE TO EACH OF SAID RAMS, A PLURALITY OF RAM VALVES IN SAID CONDUIT MEANS, EACH RAM VALVE BEING ASSOCIATED WITH A RESPECTIVE RAM FOR CONTROLLING THE FLOW OF PRESSURE FLUID THERETO, A MAIN CONTROL VALVE IN SAID CONDUIT MEANS BETWEEN SAID SOURCE AND SAID RAM VALVES, SAID MAIN VALVE HAVING A CLOSED POSITION AND FIRST AND SECOND OPEN POSITIONS FOR ADMITTING OR EXHAUSTING PRESSURE FLUID FROM SAID RAMS, ELECTRICAL CIRCUIT MEANS FOR CONTROLLING SAID VALVES, SELECTOR SWITCH MEANS SERVING TO OPEN SAID RAM VALVES WHEN SAID MAIN VALVE IS IN EITHER OF THE OPEN POSITIONS, MERCURY SWITCH MEANS IN SAID CIRCUIT FOR CONTROLLING EACH INDIVIDUAL RAM VALVE, AND MEANS FOR MOUNTING SAID MERCURY SWITCHES ON SAID CONTAINER WHEREBY SAID SWITCHES ARE NORMALLY CLOSED WHEN SAID CONTAINER IS LEVEL AND SELECTED ONES ARE OPENED WHEN SAID CONTAINER IS INCLINED TO CAUSE CLOSING OF AN ASSOCIATED RAM VALVE IN SUCH A MANNER AS TO CAUSE SAID CONTAINER TO REMAIN IN A LEVEL CONDITION DURING RAISING AND LOWERING, AND MANUAL OVERRIDE SWITCH MEANS IN SAID CIRCUIT FOR OPERATING EACH RAM INDEPENDENTLY.