Multiple louver damper

Claim 1

A MULTIPLE LOUVER DAMPER COMPRISING A FRAME AND A PLURALITY OF LOUVER BLADES DISPOSED THEREIN, SAID BLADES INCLUDING A LOWER BLADE AND AT LEAST ONE UPPER BLADE, EACH OF SAID BLADES BEING PROVIDED WITH A HINGE PORTION EXTENDING ALONG THE UPPER MARGINAL EDGE THEREOF FOR PIVOTALLY MOUNTING SAID BLADE FOR VERTICAL SWINGING MOTION WITH RESPECT TO SAID FRAME, AN OUTWARDLY PROJECTING POINTED CONTACT BEARING SURFACE FORMED INTEGRALLY WITH AND EXTENDING LONGITUDINALLY OF SAID HINGE PORTION OF EACH OF SAID BLADES, A LATERALLY PROJECTING RIDGE FORMED ADJACENT TO THE FREE SWINGING MARGINAL EDGE OF SAID LOWER BLADE, THE FREE SWINGING MARGINAL EDGE OF SAID UPPER BLADE BEING PROVIDED WITH A LATERALLY OFFSET CHANNEL RECESS ADAPTED TO RECEIVE A RESILIENT SEALING MEANS, SAID SEALING MEANS OF SAID BLADE CHANNEL RECESS, WHILE IN BLADE CLOSED POSITION, BEING ADAPTED TO OVERLAP THE HINGE PORTION OF AN ADJACENT LOWER BLADE AND SEAL AGAINST THE POINTED CONTACT BEARING SURFACE THEREOF, SAID FRAME COMPRISING TOP AND BOTTOM MEMBERS AND SIDE MEMBERS, EACH OF SAID FRAME MEMBERS HAVING A LATERALLY OPENING CHANNEL RECESS, A FIRST SEALING MEANS RECEIVED WITHIN AND PROJECTING FROM EACH OF SAID LATERALLY OPENING FRAME CHANNEL RECESSES, SUCH THAT WHEN SAID BLADES ARE IN CLOSED POSITION, SAID FIRST SEALING MEANS CARRIED BY SAID FRAME MEMBERS IS ADAPTED TO SEAL AGAINST THE PLANE VERTICALLY EXTENDING MARGINAL EDGES OF SAID BLADES, SAID FIRST SEALING MEANS CARRIED BY SAID TOP FRAME MEMBER BEING ADAPTED TO SEAL AGAINST THE HINGE PORTION OF THE UPPERMOST BLADE OF SAID BLADES, AND SAID FIRST SEALING MEANS CARRIED BY SAID BOTTOM FRAME MEMBER BEING ADAPTED TO SEAL AGAINST SAID RIDGE FORMED ON SAID LOWER BLADE, AND EACH OF SAID FRAME MEMBERS BEING FORMED WITH AN OUTWARDLY OPENING RECESS ADAPTED TO RECEIVE A SECOND SEALING MEANS ADAPTED TO EFFECT SEALING ENGAGEMENT BETWEEN SAID FRAME MEMBERS AND THE WALLS OF AN OPENING IN A STRUCTURE WITHIN WHICH SAID FRAME IS MOUNTED, SAID HINGE PORTION OF EACH OF SAID BLADES BEING FORMED BY ROLLING OVER THE UPPER MARGINAL EDGE THEREOF TO FORM A GENERALLY CYLINDRICAL CAVITY, LATERALLY OFFSET FROM A GENERALLY PLANE PORTION OF SAID BLADE, AND SAID BLADES BEING PROVIDED WITH SUPPORTING SHAFTS WHICH ARE DISPOSED WITHIN SAID CYLINDRICAL CAVITIES AND ADAPTED TO EXTEND AXIALLY OUTWARDLY ON EITHER END THEREOF TO BE RECEIVED WITHIN BEARING SLEEVE SEAL MEMBERS DISPOSED IN OPENINGS PROVIDED IN SAID SIDE FRAME MEMBERS, SAID HINGE PORTIONS OF SAID BLADES BEING REDUCED IN THICKNESS BETWEEN SAID OUTWARDLY PROJECTING POINTED CONTACT BEARING SURFACE AND SAID GENERALLY PLANE PORTION OF SAID BLADES, THEREBY PERMITTING SAID UPPERMOST BLADE TO SWING AWAY FROM SAID SEALING MEANS CARRIED BY SAID TOP FRAME MEMBER, AND SAID LOWER BLADES TO SWING AWAY FROM SAID SEALING MEANS CARRIED BY SAID SIDE FRAME MEMBERS AS SAID BLADES OPEN TO THUS PREVENT BINDING.