Folding trailer

Claim 1

IN A FOLDING TRAILER, THE COMBINATION COMPRISING A LOWER SECTION HAVING A BASE WALL AND END WALLS ON SAID BASE WALL, AN UPPER SECTION HAVING A TOP WALL AND END WALLS TELESCOPING OVER THE END WALLS OF THE LOWER SECTION, MEANS FOR RAISING AND LOWERING SAID UPPER SECTION RELATIVE TO SAID LOWER SECTION, AND A PAIR OF SIDE UNITS HINGED TO SAID BASE WALL OF SAID LOWER SECTION ALONG OPPOSITE SIDES INTERMEDIATE THE END WALLS THEREOF AND MOVABLE FROM A POSITION BETWEEN SAID END WALLS TO AN UNFOLDED POSITION OUTWARDLY THEREOF, EACH SAID UNIT COMPRISING A FIRST WALL DEFINING AN EXTENSION OF THE BASE WALL OF THE LOWER SECTION WHEN THE UNIT IS IN SAID UNFOLDED POSITION, A SECTION WALL NORMAL TO SAID FIRST WALL AND DEFINING A SIDE WALL OF THE TRAILER WHEN THE UNIT IS IN UNFOLDED POSITION, AND OPPOSED END WALLS NORMAL TO SAID FIRST AND SECOND WALLS AND DEFINING EXTENSIONS OF THE END WALLS OF THE UPPER AND LOWER SECTION WHEN THE UNIT IS IN UNFOLDED POSITION, MEANS INDIVIDUAL TO EACH SAID UNIT FOR SWINGING EACH OF SAID UNITS TO SAID UNFOLDED POSITION, SAID SIDE UNITS BEING SO DIMENSIONED THAT ONE UNIT TELESCOPES WITHIN THE OTHER WHEN THEY ARE SWUNG INWARDLY, SAID UPPER SECTION INCLUDING A PAIR OF PANELS HINGED ALONG OPPOSITE SIDES OF SAID TOP WALL INTERMEDIATE THE END WALLS THEREOF AND ADAPTED TO FORM SIDE WALLS WHEN THE TRAILER IS IN FOLDED CONDITION AND TOP WALLS OVER THE UNITS WHEN THE TRAILER IS IN UNFOLDED CONDITION, EACH SAID MEANS FOR SWINGING ONE OF SAID UNITS COMPRISING A PAIR OF LINKS PIVOTED TO ITS RESPECTIVE UNIT, A FLEXIBLE BEING JOURNALLED IN SAID LOWER SECTION WHEREBY ROTATION OF SAID LINK BEING PIVOTED TO ITS RESPECTIVE UNIT, A FLEXIBLE ELEMENT INDIVIDUAL TO EACH SAID UNIT AND HAVING THE END THEREOF CONNECTED TO SAID RESPECTIVE UNIT, AND A ROTARY ELEMENT DRIVINGLY ENGAGED WITH SAID FLEXIBLE ELEMENT AND BEING JOURNALLED IN SAID LOWER SECTION WHEREBY ROTATION OF SAID ROTARY ELEMENT CAUSES SAID FLEXIBLE ELEMENT TO BE DRIVEN IN ONE DIRECTION OR ANOTHER TO SWING THE UNIT INWARDLY OR OUTWARDLY, EACH SAID MEANS FOR SWINGING SAID UNIT INCLUDING A LEVER PIVOTED TO SAID UNIT, ONE END OF SAID FLEXIBLE ELEMENT BEING CONNECTED TO ONE END OF SAID LEVER, AND A TENSION ELEMENT CONNECTED TO THE OTHER END OF SIAD LEVER AND ONE OF SAID LINKS WHICH IS PIVOTED TO SAID LOWER SECTION.