Patent ID: 6237630
Filing Date: 2001-05-29
Classification: F16K,F24F,Y10T

Abstract:
A damper apparatus for controlling gas flow in a duct, comprising:inner walls defining an inner channel for confining a gas flow between inlet and outlet openings;a closure operable between an open position and a closed position, said closure comprising at least one blade formed of four elongate panels hinged to each other to be rotatable relative each other about four parallel axes;a stationary hingepin hingedly joining first and second panels, said stationary hingepin having its ends mounted in opposing inner walls of said channel;a first linear slot in an inner wall of said channel;a drive hingepin hingedly joining third and fourth panels, said drive hingepin having one end passing through said first linear slot in a first wall of said opposing inner walls and configured to be linearly movable therein for closing and opening said closure;a first floating hingepin hingedly joining said first and third panels;a second floating hingepin hingedly joining said second and fourth panels;wherein said stationary hingepin is positionally opposed to said drive hingepin, and said floating hingepins are positionally opposed;a slide assembly exterior of said first wall and generally parallel thereto, said one end of drive hingepin mounted to said slide assembly to be linearly moved thereby, said slide assembly including a toothed surface;a rotatable gear shaft mounted to pass through said first wall; anda gear assembly mounted on said gear shaft wherein said gear assembly meshes with said toothed surface to linearly move said slide assembly and thereby control said closure between an open position and a closed position.