초록 ▼

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 o

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.

대표청구항 ▼

A damper assembly comprising, in combination, a generally rectangular frame member including side, top and bottom members, a plurality of damper blades supported at opposite ends in the side member of the frame for limited rotative movement about axes extending longitudinally and substantially along

A damper assembly comprising, in combination, a generally rectangular frame member including side, top and bottom members, a plurality of damper blades supported at opposite ends in the side member of the frame for limited rotative movement about axes extending longitudinally and substantially along the center line of the blades, a resilient sealing strip supported in each side frame member, the outer surfaces of said sealing strips being convex and extending beyond the interior surfaces of said side frame members, portions of each end of said blades being individually angled to be generally tangential to said convex surface of said sealing strip as said blade approaches the closed position, each of said angled blade end portions wedging against said sealing strip to create a seal when said blades move into the closed position, and said assembly further comprising two washers at each blade end to reduce friction between the ends of said blades and said resilient strips at the rotative axes of said blades.