Air conditioning system

Claim 1

APPARATUS FOR CONTROLLING THE FLOW OF AIR FROM A SOURCVE TO A ROOM COMPRISING A HOUSING HAVING AN OPENING THEREIN TOR THE PASSAGE OF AIR FROM SAID SOURCE THERETHROUGH, A PLATE-LIKE DAMPER BLADE WHICH IS THIN RELATIVE TO ITS LENGTH AND WIDTH AND WHICH IS BENT ALONG A PORTION THEREOF DISPOSED CENTRALLY OF THE LENGTH DIMENSION THEREOF RORMING A LONGITUDINALLY CENTRAL RIDGE EXTENDING IN THE DIRECTION OF THE WIDTH DIMENSION OF THE BLADE, PIVOT MEANS ENGAGING SAID BLADE AT SAID RIGID AND SUPPORTED FROM SAID HOUSING AT SAID OPENING FOR PIVOTING SAIDF BLADE AROUND A PIVOT AXIS EXTENDING ALONG SAID RIDGE, SAID BLADE HAVING FIRST AND SECOND PORTIONS EXTENDING IN OPPOSITE DIRECTIONS AWAY FROM SAID AXIS AND SAID BLADE BEING ROTATABLE ABOUT SAID AXIS FROM A FIRST POSITION IN WHICH THE LENGTH AND WIDTH THEREOF EXTEND FOR SUBSTANTIALLY THE FULL LENGTH AND WIDTH OF SAID OPENING AND SUBSTANTIALLY CLOSES SAID OPENING WITH ONE SURFACE OF SAID FIRST PORTION FACING AWAY FROM SAID SOURCE TO A SECOND POSITION IN WHICH THE LENGTH OF SAID BLADE EXTENDS GENERALLY IN THE DIRECTION OF THE AIR MOVEMENT THROUGH SAID OPENING, SAID FIRST PORTION IN INTERMEDIATE SAID SOURCE AND SAID AXIS AND SAID ONE SURFACE OF SAID FIRST PORTION IN INTERMEDIATE SAID OPENING AND AN IMAGI NARY PLANE SUBSTANTIALLY PERPENDICULAR TO A PLANE CONTAINING SAID OPENING AND PARALLEL TO AND INTERSECTING SAID AXIS, THE EDGE PORTION OF SAID FIRST PORTION OF SAID BLADE MOST REMOTE FROM SAID AXIS BEING BENT OPPOSITELY TO THE DIRECTION OF THE BEND FORMING SAID RIDGE, WHEREBY IN SAID SECOND POSITION SAID FIRST PORTION OF SAID BLADE HAS AN EFFECTIVE CROSS-SECTIUON TRANSVERSE TO SAID PATH CORRESPONDING TO THE CROSS-SECTION TRANSVERSE TO SAID PATH CORNECTED TO SAID BLADE FOR EXERTING THEREON A VARIABLE MECHANICAL MOMENT URGING SAID BLADFE TOWARDS SAID SECOND POSITION, SAID MOMENT INCREASING WITH THE MOVEMENT OF SAID BLADE AWAY FROM SAID SECODN POSITION AND BEING SUBSTANTIALLY EQUALLY TO THE MOMENT EXERTED ON SAID BLADE BY THE IMPINGEMENT O F AIR THEREON IN DIFFERENT POSITIONS OF SAID BLADE, AND STOP MEANS CONNECTED TO SAID BLADE FOR PREVENTING MOVEMENT OF SAID FIRST PORTIONOF SAID BLADE BEYOND SAID SECOND POSITION THEREOF IN A DIRECTION AWAY FROM SAID FIRST POSITION.