Folding sliding doors

Claim 1

FOLDING-SLIDING DOOR COMPRISING AN OVERHEAD HORIZONTAL TRACK, A SERIES OF RUNNERS SUPPORTED BY THE TRACK, AND A SERIES OF VERTICALLY EXTENDING SLATS DEPENDING FROM THEIR RESPECTIVE RUNNERS IN A MUTUALLY HINGED ZIG-ZAG ARRANGEMENT, EACH OF SAID SLATS BEING CAPABLE OF PIVOTING ABOUT ITS LONGITUDINAL CENTRAL AXIS WHEREBY THE SERIES OF SLATS CAN BE FOLDED UP AND UNFOLDED LIKE AN ACCORDION, CHARACTERIED IN THAT: (A) EACH OF THE SLATS IN THE SERIES ESSENTIALLY COMPRISING A FLAT HOLLOW PROFILE OF EXTRUDED PLASTICS INCLUDING A PAIR OF PARTITIONS SPACED FROM THE ENDS OF THE PROFILE INTERCONNECTING THE OPPOSITE FACE WALLS OF THE PROFILE AT LOCATIONS ENCLOSING THEREBETWEEN THE LONGITUDINAL CENTRAL AXIS OF THE LATTER; (B) EACH OF THE RUNNERS COMPRISES A STIRRUP SECTION ENCASED IN THE UPPER END OF THE SLAT BETWEEN SAID PARTITIONS, A CYLINDRICAL NECK SECTION PROTRUDING OUTWARDLY FROM THE STIRRUP SECTION IN ALIGNMENT WITH SAID LONGITUDINAL CENTRAL AXIS, AND AN ENLARGED HEAD SECTION ON SAID NECK SECTION COMPRISING A SPHERICAL SURFACE TURNED TOWARDS THE STIRRUP SECTION, SAID STIRRUP