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Wedge sealed damper

Image Number 2 for United States Patent #4294283.

A damper assembly comprising, in combination, a generally rectangular frame including side, top and bottom members, a plurality of damper blades supported at opposite ends on the side members of the frame for limited rotative movement about axes extending longitudinally and substantially centrally of the blades, each of said blades comprising a resilient sealing strip along at least one edge of said blade, and the ends of the blades being angled in opposite directions above and below the rotative axis of the blades, and cooperating with resilient side sealing strips in the frame, the ends of the blades wedging against the sealing strips as the blades approach closed position, the blades being held in closed position by the wedging action.

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