Trucks

Claim 1

A TRUCK COMPRISING A CHASSIS; A SET OF MAIN WHEELS FITTED TO SAID CHASSIS; SPACED AXLE BEARINGS MOUNTED ON THE CHASSIS AT OPPOSITE SIDES THEREOF; TWO AXLES MOUNTED AT OPPOSITE SIDES OF SAID CHASSIS AND MOUNTED TO TURN IN SAID BEARINGS; A SET OF WHEEL ARMS RIGIDLY SECURED TO EACH OF THE SAID TWO AXLES SUCH THAT THE WHEEL ARMS OF EACH SET ARE TURNABLE IN UNISON WITH THE AXLE TO WHICH THEY ARE RIGIDLY SECURED, AT LEAST ONE OF SAID SETS COMPRISING MORE THAN ONE WHEEL ARM, AN AUXILIARY WHEEL MOUNTED ON EACH OF SAID WHEEL ARMS, SAID AUXILIARY WHEEL BEING DISPOSED WITH THEIR AXES AT AN ANGLE WITH RESPECT TO THE AXES OF THE MAIN WHEELS; A FIRST PRESSURE ARM ANTICULATED TO A WHEEL ARM ON A FIRST SIDE OF THE CHASSIS AND EXTENDING INWARDLY FROM SAID WHEEL ARM, A SECOND PRESSURE ARM ARTICULATED TO A WHEEL ARM ON THE OPPOSITE SIDE OF THE CHASSIS AND EXTENDING INWARDLY FROM SAID WHEEL ARM, A COUPLING MEANS FOR CONNECTING TOGETHER THE INNER ENDS OF SAID FIRST AND SECOND PRESSURE ARMS, AND A MEANS FOR APPLYING A SINGLE FORCE TO SAID COUPLING MEANS WHEREBY AS A CONSEQUENCE OF THE APPROPRIATE APPLICATION OF SAID SINGLE FORCE THE SAID AXLES ARE TURNED SO THAT ALL THE WHEEL ARMS ARE SIMULTANEOUSLY SWUNG DOWNWARDLY TO LOWER THE AUXILIARY WHEELS INTO CONTACT WITH THE GROUND AND AUTOMATICALLY LIFT THE CHASSIS TO RAISE THE MAIN WHEELS OFF THE GROUND, AND WHEREBY THE APPLICATION OF THE SAID SINGLE FORCE IN THE REVERSE DIRECTION CAUSES THE AXLES TO BE TURNED IN THE OPPOSITE DIRECTION AND ALL THE WHEEL ARMS TO BE SWUNG UPWARDLY SIMULTANEOUSLY TO RAISE THE AUXILIARY WHEELS CLEAR OF THE GROUND AND AT THE SAME TIME LOWER THE MAIN WHEELS TO THE GROUND.