Folding door structure

Claim 1

A FOLDING DOOR STRUCTURE COMPRISING TOP AND BOTTOM FRAME MEMBERS, A PAIR OF FIRST AND SECOND PANELS HINGEDLY CONNECTED ALONG A FIRST VERTICAL AXIS, SAID FIRST PANEL BEING MOUNTED TO PIVOT ABOUT A SECOND VERTICAL AXIS LYING WITHIN SAID FRAME MEMBERS, SAID SECOND PANEL BEING SHORTER IN WIDTH THAN SAID FIRST PANEL, MEANS ASSOCIATED WITH SAID TOP FRAME MEMBER DEFINING A GUIDEWAY, A VERTICALLY UPSTANDING GUIDE MEMBER RIGIDLY CONNECTED TO SAID SECOND PANEL AND EXTENDING INTO SAID GUIDEWAY, WHEREBY SAID GUIDE MEMBER IS CONFINED TO A PREDETERMINED PATH, THE DISTANCE BETWEEN SAID FIRST AND SECOND AXES BEING LESS THAN THE DISTANCE BETWEEN SAID FIRST AXIS AND SAID GUIDE MEMBER, STOP MEANS PREVENTING SAID PANELS FROM ASSUMING PARALLEL POSITIONS, AND A REINFORCING MEMBER HAVING AN INWARDLY OPEN RECESS FORMED THEREIN, AFFIXED TO SAID TOP FRAME MEMBER PROXIMATE THE END OF THE PATH OF SAID GUIDE MEMBER IN THE OPEN POSITION OF SAID PANELS, THE RECESS IN SAID REINFORCING MEMBER REGISTERING WITH THE CONFRONTING END PORTION OF SAID GUIDEWAY AND HAVING OPPOSED SIDE WALLS, THE RECESS BEING IN SUBSTANTIAL ALIGNMENT WITH SAID GUIDEWAY AND RECEIVING SAID GUIDE MEMBER BETWEEN THE SIDE WALLS IN SAID OPEN POSITION, WHEREBY WHEN SAID PANELS ARE IN THE OPEN POSITION REARWARD AND FORWARD TRAVEL OF SAID GUIDE MEMBER IS RESTRICTED BY THE WALLS OF SAID RECESS AND SAID PANELS ARE PREVENTED FROM ASSUMING RELATIVELY PARALLEL POSITIONS.