Hydro-pneumatic suspension system for vehicle

Claim 1

IN A VEHICLE, THE COMBINATION COMPRISING: A VEHICLE FRAME; AXLE MEANS CARRIED BY SAID FRAME FOR RELATIVE VERTICAL MOVEMENT WITH RESPECT THERETO; A PLURALITY OF HYDRAULIC LOAD CARRYING BELLOWS OPERATIVELY CONNECTED BETWEEN SAID AXLE MEANS AND SAID FRAME ON EACH SIDE OF SAID FRAME; FIRST ACCUMULATOR MEANS COOPERATING WITH THE BELLOWS ON ONE SIDE OF SAID FRAME AND SECOND ACCUMULATOR MEANS COOPERATING IN THE BELLOWS ON THE OTHER SIDE OF SAID FRAME, EACH OF SAID ACCUMULATOR MEANS BEING PROVIDED WITH MEANS THEREIN DIVIDING THE SAME INTO A VARIABLE VOLUME HYDRAULIC CHAMBER AND A VARIABLE VOLUME PNEUMATIC CHAMBER, THE INCREASE IN VOLUME OF ONE OF SAID CHAMBERS CAUSING A DECREASE IN VOLUME OF THE OTHER ASSOCIATED CHAMBER; MEANS COMMUNICATING EACH HYDRAULIC CHAMBER WITH THE ASSOCIATED BELLOWS; A SOURCE OF PRESSURIZED GAS; AND SEPARATE CONTROL MEANS COOPERATING WITH EACH OF SAID ACCUMULATOR MEANS AND OPERABLE IN RESPONSE TO A DECREASE IN THE VOLUME OF THE RESPECTIVE HYDRAULIC CHAMBER FOR RELEASING PRESSURE FROM THE RESPECTIVE PNEUMATIC CHAMBER AND OPERABLE IN RESPONSE TO AN INCREASE IN THE VOLUME OF THE RESPECTIVE HYDRAULIC CHAMBER FOR CONDUCTING PRESSURIZED GAS FROM SAID SOURCE TO THE RESPECTIVE PNEUMATIC CHAMBER TO THEREBY OPPOSE A CHANGE IN THE VOLUME OF THE HYDRAULIC CHAMBER AND RETURN THE VOLUME OF THE SAME TO A PREDETERMINED VOLUME.