Steerable trailer vehicle

Claim 1

A TRAILER VEHICLE ADAPTED TO BE CONNECTED TO AND TOWED BY A TOWING VEHICLE, SAID TRAILER VEHICLE COMPRISING A FRAME HAVING A FORWARD END AND A REARWARD END; FIRST AXLE MEANS; FIRST MOUNTING MEANS MOUNTING SAID FIRST AXLE MEANS FOR SWIVELING MOVEMENTS ABOUT A SUBSTANTIALLY VERTICAL AXIS; FIRST SUSPENSION MEANS YIELDABLY MOUNTING SAID FIRST MOUNTING MEANS ON AND ADJACENT THE REARWARD END OF SAID FRAME FOR SUBSTANTIALLY VERTICAL MOVEMENTS OF SAID FIRST AXLE MEANS RELATIVE TO SAID FRAME; SECOND AXLE MEANS; SECOND MOUNTING MEANS MOUNTING SAID SECOND AXLE MEANS FOR SWIVELING MOVEMENTS ABOUT A SUBSTANTIALLY VERTICAL AXIS; SECOND SUSPENSION MEANS YIELDABLY MOUNTING SAID SECOND MOUNTING MEANS ON SAID FRAME FORWARDLY OF SAID FIRST AXLE MEANS FOR SUBSTANTIALLY VERTICAL MOVEMENTS THEREOF RELATIVE TO SAID FRAME; PIVOTAL MEANS LINKING THE SUSPENSION MEANS OF SAID FIRST AND SECOND AXLE MEANS FOR TRANSMITTING VERTICAL MOVEMENT OF EITHER OF SAID FIRST AND SECOND AXLE MEANS AND REACTING WITH SAID FRAME TO THE OTHER BUT IN AN OPPOSITE DIRECTION, SAID LINKING MEANS COMPRISING A PAIR OF BELL CRANKS EACH PIVOTED ON SAID FRAME ADJACENT ITS RESPECTIVE AXLE MEANS AND CONNECTED TO ONE ANOTHER; COUPLING MEANS ROTATABLY MOUNTED AT THE FORWARD END OF SAID FRAME FOR COUPLING SAID FRAME TO A TOWING VEHICLE; AND FORCE TRANSMITTING MEANS INTERCONNECTING SAID COUPLING MEANS AND EACH OF SAID AXLE MEANS FOR TRANSMITTING ROTATION OF SAID COUPLING MEANS TO EACH OF SAID AXLE MEANS.