Damper assembly

A multiblade damper assembly having at least three blades mounted to pivot between a closed position in which the blades are in the plane of a damper frame opening to block that opening, and an open position in which the blades are at an angle to the plane of the frame opening, means interlinking said blades comprising, a bracket secured to each of said blades, each of said brackets being formed with a pair of parallel extension arms which extend beyond an end of the blades, said extension arms having opposed openings for receiving a cylindrical pivot at their outer ends, a cylindrical pivot rotatably mounted between the arms of each of said brackets in the opposed openings on said arms, said cylindrical pivot having a threaded axial bore on at least one end thereof and a cross hole extending therethrough, at least one of said brackets having a second axially bored pivot with a cross hole extending therethrough rotatably secured to the pivot between the arms of said bracket, said second pivot extending to one side of said bracket, and connecting rods interconnecting pairs of blades by having the opposite ends of each rod secured within the cross holes of said pivots, including both of said rotatably interconnected pivots.