Folding door air exhaust

Claim 1

A FOLDING DOOR STRUCTURE ADAPTED TO RETARD THE TRANSFER OF SOUND, SAID DOOR STRUCTURE INCLUDING TWO SPACED, GENERALLY PARALLEL, FLEXIBLE WALLS SUPPORTED ON AN EXTENSIBLE AND RETRACTABLE FRAMEWORK, SUPPORTING MEANS FOR SLIDABLY SUSPENDING SAID FRAME FROM AN OVERLYING SUPPORTING SURFACE AND PERMITTING MOVEMENT OF SAID FRAME AND THE SPACED FLEXIBLE WALLS SUPPORED THEREBY BETWEEN A RETRACTED AND AN EXTENDED POSITION, AID SPACED WALLS HAVING AN ACCORDION-LIKE FOLDED CONFIGURATION WITH THE FOLDS DISPOSED SO THAT A LINED JOINING THE APICES OF OPPOSITE FOLDS IS GENERALLY NORMAL TO THE DIRECTION OF MOVEMENT OF THE DOOR STRUCTURE BETWEEN SAID EXTENDED AND RETRACTED POSITIONS, THE DISTANCE BETWEEN SAID APICES OF CORRESPONDINGLY OPPOSITE FOLDS ON SAID WALLS VARYING FROM A MINIMUM TO A MAXIMUM AS THE DOOR STRUCTURE IS MOVED BETWEEN SAID EXTENDED AND RETRACTED POSITIONS, AND A PLATE ADAPTED TO OVERLIE AND BE ENGAGED BY THE UPPER MARGINALS OF SAID FLEXIBLE WALLS, SAID PLATE BEING COEXTENSIVE WITH THE PATH OF TRAVEL OF THE DOOR STRUCTURE AS IT MOVES BETWEEN SAID EXTENDED AND RETRACTED POSITIONS AND SPANNING THE DISTANCE BETWEEN CORRESPONDINGLY OPPOSITE APICES OF SAID FLEXIBLE WALL FOLDS ONLY AS THE DOOR STRUCTURE CLOSELY APPROACHES ITS SAID EXTENDED POSITION, WHEREBY MOVEMENT OF SAID DOOR STRUCTURE FROM ITS SAID EXTENDED POSITION TOWARD ITS SAID RETRACTED POSITION MOVES THE CORRESPONDINGLY OPPOSITE APICES OF SAID FOLDS OUTBOARD OF SAID PLATE TO VENT THE SPACE BETWEEN SAID FLEXIBLE WALLS UPWARDLY THROUGH THE SPACES THEREBY UNMASKED FROM SAID PLATE.