Hinge structure

Claim 1

A HINGE COMPRISING A PAIR OF COMPLEMENTARY FIRST AND SECOND HINGE SECTIONS ADAPTED TO BE SECURED TO ADJACENT PANELS OF A FOLDING DOOR, SAID FIRST HINGE SECTION HAVING A FIRST LONGITUDINAL EXTENDING STRIP PROVIDED ALONG ONE LONGITUDINAL EDGE THEREOF WITH FIRST SPACED ALIGNED KNUCKLES AND ALONG THE OTHER EDGE THEREOF WITH LONGITUDINALLY SPACED LEAVES ALTERNATELY PERPENDICULAR AND PARALLEL TO SAID FIRST STRIP, SAID PARALLEL LEAVES BEING INWARDLY OFFSET RELATIVE TO SAID FIRST STRIP, SAID SECOND HINGE SECTION INCLUDING A SECOND LONGITUDINALLY EXTENDING STRIP PROVIDED ALONG ONE LONGITUDINAL EDGE THEREOF WITH SECOND KNUCKLES INTERDIGITATING SAID FIRST KUCKLES AND ALONG THE OTHER EDGE THEREOF WITH LONGITUDINALLY SPACED LEAVES ALTERNATELY PARALLEL AND PERPENDICULAR TO SAID STRAP, THE LEAVES PARALLEL TO THE STRIPS BEING IN SUBSTANTIALLY COPLANAR END TO END RELATIONSHIP AND SANDWICHED BETWEEN THE END FACES OF SAID PANELS WHEN THE PANELS ARE IN COMMON PLANE, A CAM MOUNTED ON A KNUCKLE OF THE FIRST HINGE SECTION AND ENGAGING THE FIRST STRIP, A CAM FOLLOWER MOUNTED ON A PERPENDICULAR LEAF OF SAID SECOND HINGE SECTION AND BEARING ON SAID CAM TO RELEASABLY RETAIN THE PANELS IN DESIRED ANGULAR RELATIONSHIPS RELATIVE TO EACH OTHER.