Extensible trailer frame

Claim 1

AN ADJUSTABLE TRUCK TRAILER COMPRISING A FORWARD SECTION AND A REARMOST SECTION, THE FORWARD SECTION ADAPTED TO HAVE ITS FRONT END SUPPORTED BY A TRUCK, THE REARMOST SECTION BEING PARTIALLY SUPPORTED BY A WHEEL ASSEMBLY, THE FORWARD SECTION COMPRISING A GENERALLY LONGITUDINAL FRAMEWORK HAVING OUTER LONGITUDINAL BEAMS AND INNER LONGITUDINAL SUPPORT BEAMS AND HAVING TRANSVERSELY EXTENDING CHANNEL BARS SECURED TO THE OUTER LONGITUDINAL BEAMS AND THE INNER LONGITUDINAL SUPPORT BEAMS, THE INNER LONGITUDINAL SUPPORT BEAMS BEING CHANNEL SHAPED AND HAVING UPPER AND LOWER FLANGES, THE REARMOST SECTION COMPRISING LONGITUDINALLY MOVABLE BEAMS OPERATIVELY CONNECTED WITH THE FORWARD SECTION IN TELESCOPICALLY SLIDABLE RELATION SO THAT THE TRAILER CAN BE FORESHORTENED OR LENGTHENED AT WILL WHEREBY THE WHEEL BASE BETWEEN REAR WHEEL ASSEMBLY AND THE TRUCK MAY BE SET AT A PREDETERMINED DISTANCE, THE REARMOST LONGITUDINALLY MOVABLE BEAMS BEING CHANNEL SHAPED AND HAVING UPPER AND LOWER FLANGES, ANTIFRICTION ROLLER MEANS EFFECTIVE BETWEEN THE FORWARD SECTION AND THE REARMOST SECTION TO ALLOW FREE RELATIVE MOVEMENT THEREBETWEEN TO PERMIT LENGTHENING AND SHORTENING OF THE WHEEL BASE, THE ROLLER MEANS COMPRISING FORWARD SECTION ROLLER SETS SECURED TO THE INNER SUPPORT BEAMS INCLUDING A PLURALITY OF ROLLER WHEELS ADAPTED TO MOVE UPON THE UPPER FLANGE OF EACH REARMOST MOVABLE BEAM, AND REARMOST SECTION ROLLER SETS SECURED TO THE MOVABLE BEAMS ADAPTED TO MOVE UPON THE LOWER FLANGE OF EACH SUPPORT BEAM, LOCKING MEANS ADAPTED TO SECURE THE FORWARD SECTION TO THE REARMOST SECTION AT A PLURALITY OF PREDETERMINED POSITIONS, AND STOP MEANS ASSOCIATED WITH THE FORWARD SECTION AND THE REARMOST SECTION TO PREVENT THE DISENGAGEMENT OF THE SECTIONS, A LONGITUDINALLY MOVABLE SUPPORT BED CARRIED UPON THE UPPER FLANGE OF THE MOVABLE BEAMS, MEANS ASSOCIATED WITH THE SUPPORT BED FOR POSITIONING THE SUPPORT BED IN A PLURALITY OF PREDETERMINED POSITIONS.