Track mounted telescoping loading and unloading ramp for aircraft

Claim 1

IN A TRACK MOUNTED, TELESCOPING LOADING AND UNLOADING RAMP, THE COMBINATION OF: A SUPPORTING STRUCTURE; OVERHEAD TRACK MEANS CARRIED BY SAID SUPPORTING STRUCTURE; A PASSAGEWAY SUSPENDED FROM SAID TRACK MEANS AND INCLUDING A FIRST DOORWAY FACING IN THE DIRECTION OF SAID TRACK MEANS, SAID PASSAGEWAY INCLUDING A SECOND DOORWAY ADAPTED TO REGISTER WITH A DOORWAY IN A TERMINAL BUILDING, OR THE LIKE; TELESCOPING RAMP MEANS BELOW SAID TRACK MEANS AND INCLUDING AN INNER TUNNEL AND AN OUTER TUNNEL TELESCOPED OVER SAID INNER TUNNEL, SAID INNER TUNNEL HAVING AN INNER END IN REGISTER WITH SAID FIRST DOORWAY; HORIZONTAL PIVOT MEANS EXTENDING TRANSVERSELY OF SAID TRACK MEANS ADJACENT THE BOTTOM OF SAID FIRST DOORWAY AND PIVOTALLY CONNECTING SAID INNER END OF SAID INNER TUNNEL TO SAID PASSAGEWAY, WHEREBY SAID RAMP MEANS MAY PIVOT UPWARDLY AND DOWNWARDLY ABOUT THE AXIS OF SAID PIVOT MEANS; WHEELED SUSPENSION MEANS FOR SAID RAMP MEANS ENGAGING AND MOVABLE ALONG SAID TRACK MEANS AND CONNECTED TO SAID OUTER TUNNEL; DRIVE MEANS