Vehicle body door structure

Claim 1

IN A HIGHWAY VEHICLE HAVING A BODY FOR CONTAINING FREIGHT AND A DOOR OPENING THROUGH WHICH FREIGHT CAN BE LOADED AND UNLOADED, DOOR STRUCTURE FOR SAID OPENING COMPRISING, A PLURALITY OF PANEL ELEMENTS EXTENDING LONGITUDINALLY ACROSS SAID OPENING AND HAVING PIVOTALLY INTERCONNECTED SIDE PORTIONS AND GUIDE ELEMENTS AT THEIR ENDS, A GENERALLY VERTICALLY EXTENDING TRACK MEMBER ADJACENT EACH SIDE OF SAID OPENING AND A TRACK MEMBER EXTENDING GENERALLY HORIZONTALLY AWAY FROM THE UPPER CORNERS OF SAID OPENING, SAID TRACK MEMBERS HAVING INWARDLY DISPOSED CHANNELS GUIDINGLY RECEIVING SAID GUIDING ELEMENTS, EACH OF SAID TRACK MEMBERS HAVING AN OUTWARDLY EXTENDING MOUNTING FLANGE, A CORNER MEMBER ADJACENT EACH UPPER CORNER OF SAID OPENING HAVING AN INWARDLY DISPOSED CURVED CHANNEL PORTION INTERCONNECTING THE VERTICAL AND HORIZONTAL CHANNELS, EACH CORNER MEMBER HAVING A GENERALLY STRAIGHT ENLARGED PORTION DEFINING A SHOULDER ADJACENT EACH END OF SAID CURVED CHANNEL PORTION, A MOUNTING FLANGE EXTENDING OUTWARDLY FROM EACH ENLARGE PORTION, EACH OF SAID ENLARGED PORTIONS HAVING A LONGITUDINAL SLOT BETWEEN THE BASE OF ITS CHANNEL PORTION AND ITS SAID MOUNTING FLANGE, THE UPPER ENDS OF SAID VERTICAL TRACK MEMBERS AND THE DOORWARD ENDS OF SAID HORIZONTAL TRACK MEMBERS FITTING RESPECTIVELY INTO SAID ENLARGED PORTIONS AND ABUTTING SAID SHOULDERS WITH SAID MOUNTING FLANGES ON SAID TRACK MEMBERS BEING DISPOSED IN SAID SLOTS AND OVERLYING SAID MOUNTING FLANGES ON SAID CORNER MEMBER, SAID CHANNELS IN SAID TRACK MEMBERS AND CORNER MEMBER COOPERATING TO DEFINE A CONTINUOUS GUIDEWAY FOR SAID GUIDE MEMBERS FACILITATING SELECTIVE MOVEMENT OF SAID PANEL MEMBERS TO A CLOSED POSITION WITHIN THE DOOR OPENING AND AN OPEN POSITION ABOVE THE SAME.