Fifth wheel pneumatic suspension system

Claim 1

A FIFTH WHEEL PNEUMATIC SUSPENSION SYSTEM FOR A TRAILER HAVING A PAIR OF OPPOSED RUB RAILS AT ITS FORWARD END COMPRISING, A FIFTH WHEEL PLATE SLIDABLY MOUNTED BETWEEN SAID OPPOSED RUB RAILS, MEANS RESTRICTING SAID PLATE TO VERTICAL RECTILINEAR MOVEMENT WITHIN SAID RAILS, FOUR EXPANSIBLE AND CONTRACTIBLE PNEUMATIC CUSHIONS INTERPOSED BETWEEN SAID PLATE AND THE TRAILER, SAID CUSHIONS BEING ARRANGED IN PAIRS INDIVIDUALLY POSITIONED ADJACENT A SEPARATE ONE OF SAID RAILS, THE CUSHIONS OF EACH OF SAID PAIR BEING IN SPACED RELATION ADJACENT THE RESPECTIVE RAIL TO SUPPORT THE FORWARD END OF THE SAID TRAILER AT THE LATERAL EXTREMITIES THEREOF, AND CONTROL MEANS FOR SAID CUSHIONS COMPRISING A SOURCE OF FLUID PRESSURE CONNECTED TO SAID CUSHIONS AND TWO FLOW CONTROL VALVES INDIVIDUALLY OPERABLE TO CONTROL THE EXPANSION AND CONTRACTION OF A SEPARATE ONE OF SAID PAIR OF CUSHIONS, EACH OF SAID VALVES INCLUDING EXHAUST MEANS AND HAVING AN ACTUATINV ARM CONNECTED TO THE RESPECTIVE SIDE OF SAID PLATE WHEREBY THE OPPOSITE SIDES OF THE FORWARD END OF THE TRAILER ARE SEPARATELY CONTROLLED.