Double-sash device for automatic air ventilation

Claim 1

IN AN AIR CONDITIONING SYSTEM, A DOUBLE SASH DEVICE FOR EFFECTING AUTOMATIC AIR VENTILATION COMPRISING A WINDOW FRAME HAVING A PLURALITY OF APERTURES COMMUNICATING WITH THE OUTER ATMOSPHERE, AND OUTER SASH UNIT AND AN INTERIOR SASH UNIT MOUNTED IN MUTUAL SPACED-PART FACE-TO-FACE RELATION AND DEFINING AN ENCLOSED CHAMBER WITH SAID WINDOW FRAME, SAID OUTER SASH UNIT COMPRISING TWO SASHES SLIDABLY MOUNTED IN SASH WINDOW FRAME, A SUPPORTING MEANS FOR SEATING SAID INTERIOR SASH UNIT THEREON, HINGE MEANS INTERCONNECTING SAID SUPPORTING MEANS AND SAID INTERIOR SASH UNIT FOR ENABLING THE LATTER TO BE MOVED OUT OF ABUTTING RELATION WITH THE FORMER AT THE BOTTOM OF SAID INTERIOR SASH UNIT, MEANS FOR DRAWING AIR FROM WITHIN THE ROOM INTO SAID CHAMBER, AND RESILIENT SHEET MEANS HAVING ONE END SECURED TO THE UPPER PORTION OF SAID WINDOW FRAME AND THE OTHER END DISPOSED TO OVERLIE THE UPPER MARGINAL PORTION OF SAID OUTER SASH UNIT.