Vehicle with extendable wheels

Claim 1

IN A WHEELED FARM VEHICLE OF THE TYPE ADAPTED TO STRADDLE ROW CROPS AND INCLUDING FRONT AND REAR WHEELS DISPOSED ON THE SIDES OF THE VEHICLE, DRIVE MEANS FOR AT LEAST ONE OF SAID WHEELS, AN OPERATING PLATFORM, LEFT AND RIGHT SUBFRAME MEANS FOR SUPPORTING SAID PLATFORM AT AN ELEVATED POSITION ABOVE SAID WHEELS FOR MOVEMENT THEREWITH AND FOR INDEPENDENTLY FORMING THE FRONT AND REAR WHEELS ON EACH SIDE OF THE VEHICLE INTO RIGID UNITARY STRUCTURES, EACH OF SAID SUBFRAME MEANS MOUNTED FOR LATERAL MOVEMENT AS A UNIT WITH RESPECT TO THE VEHICLE SO THAT THE FRONT AND REAR WHEELS ON EACH RESPECTIVE SIDES OF THE VEHICLE CAN BE SIMULTANEOUSLY MOVED SIDEWAYS AN EQUAL AMOUNT WITH RESPECT TO THE VEHICLES, AND A STEERING LINKAGE OPERATIVELY CARRIED BY EACH SUBFRAME, SAID LEFT LINKAGE STEERABLY CONNECTING LEFT FRONT AND LEFT REAR WHEELS, SAID RIGHT LINKAGES STEERABLY CONNECTING RIGHT FRONT AND RIGHT REAR WHEELS, A STEERING CONTROL CONNECTED TO BOTH SAID LEFT AND RIGHT STEERING LINKAGES, SAID STEERING LINKAGES INCLUDING DOUBLE CRANK LEVER MEANS, SAID STEERING LINKAGES RESPONSIVE TO SAID STEERING CONTROL TO EFFECT A SMALLER TURNING RADIUS OF FRONT AND REAR WHEELS POSITIONED ON THE VEHICLE DURING A TURNING OPERATION.