Steering system

Claim 1

A STEERING SYSTEM FOR U-SHAPED VEHICLES HAVING AN UNOBSTRUCTED LOAD HANDLING POCKET AND THREE PAIRS OF TRANSVERSELY SPACED WHEELS SPACED LONGITUDINALLY OF THE VEHICLE, COMPRISING OPERATOR CONTROL MEANS OPERATIVELY CONNECTED TO EACH WHEEL FOR PROVIDING DIFFERENTIAL STEERING ANGLES BETWEEN THE THREE WHEELS ON EACH SIDE OF THE VEHICLE AND BETWEEN THE RESPECTIVE ONES OF EACH SAID PAIR OF WHEELS, SAID OPERATIVE CONNECTION INCLUDING A MAIN STEERING ARM ASSEMBLY LOCATED LONGITUDINALLY INTERMEDIATE THE FRONT AND REAR WHEELS ON EACH SIDE OF THE VEHICLE AND IN THE VERTICAL PLANE OF THE RESPECTIVE SIDES, ACTUATOR MEANS FOR PIVOTING EACH SAID STEERING ARM ASSEMBLY IN EITHER DIRECTION FROM A NEUTRAL POSITION THEREOF, A PLURALITY OF FIRST CRANK ARMS SECURED TO AND EXTENDING OUTWARDLY OF EACH SAID STEERING ARM ASSEMBLY AT PREDETERMINED ANGLES RELATIVE TO AN AXIS TRANSVERSE OF THE VEHICLE, A PLURALITY OF SECOND CRANK ARMS OPERATIVELY CONNECTED TO AND EXTENDING OUTWARDLY OF DIFFERENT ONES OF THE WHEELS ON EACH SIDE OF THE VEHICLE, AND TIE ROD MEANS EXTENDING LONGITUDINALLY OF AND IN THE VERTICAL PLANE OF EACH SIDE OF THE VEHICLE AND CONNECTING RESPECTIVE ONES OF SAID FIRST CRANK ARMS TO RESPECTIVE ONES OF SAID SECOND CRANK ARMS, SAID FIRST AND SECOND CRANK ARMS, SAID TIE ROD MEANS AND SAID STEERING ARM ASSEMBLIES BEING SO CONSTRUCTED AND ARRANGED THAT PIVOTAL MOVEMENT OF SAID MAIN STEERING ARM ASSEMBLY IN EITHER DIRECTION PRODUCES PREDETERMINED DIFFERENTIAL DIRIGIBLE MOVEMENT OF THE THREE WHEELS ON EACH SIDE OF THE VEHICLE BOTH WITH RESPECT TO EACH LONGITUDINALLY RELATED WHEEL AND WITH RESPECT TO EACH TRANSVERSELY RELATED WHEEL.