Hinge structure

Claim 1

A FOLDING DOOR STRUCTURE COMPRISING A PAIR OF VERTICAL FIRST AND SECOND LATERALLY SPACED RECTANGULAR PANELS HAVING TRANSVERSELY SPACED FRONT AND REAR FACES AND CONFRONTING INNER END FACES INTERSECTING SAID FRONT FACES AT INNER FRONT EDGES, MEANS SUPPORTINGSAID FIRST PANEL FOR SWINGING ABOUT A VERTICAL AXIS ADJACENT THE OUTER EDGE THEREOF, MEANS LIMITING THE MOVEMENT OF THE OUTER EDGE OF SAID SECOND PANEL ALONG A PREDETERMINED LINEAR PATH IN TRANSVERSE ALIGNMENT WITH SAID VERTICAL AXIS, AN INTERMEDIATE PANEL DISPOSED BETWEEN SAID FIRST AND SECOND PANELS, AND MEANS HINGING SAID FIRST AND SECOND PANELS ALONG SUBSTANTIALLY SAID INNER FRONT EDGES THEREOF TO SAID INTERMEDIATE PANEL ALONG VERTICAL AXES ON SAID INTERMEDIATE PANEL LATERALLY SPACED A DISTANCE SUBSTANTIALLY EQUAL TO THE SUM OF THE THICKNESSES OF SAID FIRST AND SECOND PANELS, WHEREBY SAID FIRST AND SECOND PANELS ARE MOVABLE BETWEEN AN EXTENDED CLOSED POSITION IN SUBSTANTIALLY COPLANAR RELATIONSHIP AND A COLLAPSED OPEN POSITION IN A SUBSTANTIALLY PARALLEL RELATIONSHIP DIRECTED FORWARDLY OF SAID OUTER EDGES IN THE SUBSTANTIAL ABSENCE AT THE FRONT OF SAID DOOR STRUCTURE OF PINCH AREAS DELINEATED BY ACCESSIBLE SURFACES FOLDING TOWARD EACH OTHER ATTENDANT TO THE OPERATION OF SAID DOOR STRUCTURE.