Cargo conveyance means

Claim 1

IN CARGO TRANSPORT MEANS FOR SUPPORT OF A LOAD CARRIER COMPRISING A STRUCTURE ADAPTED TO RECEIVE A LOAD TO BE TRANSPORTED, SAID CARRIER HAVING A SUBSTANTIALLY FLUID TIGHT BOTTOM SURFACE AND A DEPENDING SKIRT PERMETRALLY THEREOF EXTENDING THEREBELOW PROVIDING A BELL TYPE FLUID PRESSURE RETAINING CHAMBER IN THE BOTTOM OF SAID CARRIER, THE IMPROVEMENT COMPRISING A FLOOR STRUCTURE OF GENERALLY FLUID TIGHT FORM HAVING FLUID OUTLET PORTS THERETHROUGH AT INTERVALS THROUGHOUT THE AREA OF SAID FLOOR, CONDUIT MEANS IN COMMUNICATION WITH EACH OF SAID OUTLET PORTS FOR SUPPLYING THE LATTER WITH PRESSURE FLUID, A VALVE DEVICE CONTROLLING FLOW OF FLUID THROUGH EACH OF SAID PORTS, MEANS BIASING EACH OF SAID VALVE DEVICES TOWARD CLOSED POSITION, FLUID PRESSURE RESPONSIVE MEANS CONNECTED TO EACH OF SAID VALVES AND ADAPTED TO COUNTER THE ACTION OF SAID BIASING MEANS, AND BACK PRESSURE CONDUIT MEANS OPENING THROUGH SAID FLOOR STRUCTURE ADJACENT SAID PORTS AND OPERATIVELY COUPLED TO SAID PRESSURE RESPONSIVE MEANS FOR ACTUATING THE LATTER AND OPENING THE ASSOCIATED VALVE DEVICE WHENEVER A FLUID BACK PRESSURE DEVELOPS IN SAID BACK PRESSURE CONDUIT MEANS SUCH AS WHEN A CARRIER IS DISPOSED ABOVE THE LOCATION OF THE ASSOCIATED PORT.