Multi-blade damper

Claim 2

In a damper having an open retangular frame, a plurality of rectangular blades mounted on transversely extending parallel shafts, and means for simultaneously swinging said blades between open position parallel to air flow through said frame and closed position across air flow, the improvement comprising a flexible, thin, metal sealing strip secured to and extending along and laterally beyond the down-wind edge of each of said blades and into flexed engagement with the low pressure side of an adjacent blade near its other edge when said blades are in closed position, the sealing strip on an end one of said blades adjacent a transverse frame member engaging said frame member in closed position, whereby said sealing strips are bent slightly beyond their normal positions when said blades are in closed position.

Claim 3

In a damper according to claim 1, the improvement comprising a flexible, thin metal sealing strip mounted on and extending transversely across a transverse frame member adjacent tHe other end one of said blades and engaged by the up-wind edge of said adjacent blade when said blades are in closed position.

Claim 4

In a damper according to claim 1, the improvement comprising sealing flaps on the ends of said blades extending into wiping contact with the side members of the damper frame.

Claim 5

A damper according to claim 2 and a gas deflector mounted on and extending along said frame member adjacent to and on the up-wind side of the frame mounted sealing strip.

Claim 6

An improved blade for a damper, said blade consisting of two shallow V-shaped, substantially rectangular sheets of metal, the longitudinal edges of one of said sheets being bent around in return lips embracing the edges of the other of said sheets and secured thereto, the two sheets being positioned on opposite sides of a mounting shaft with their edges forming parallel apices lying parallel to and evenly spaced from such shaft, a pair of thin, flexible metal sealing flaps mounted on each end of said blade for wiping sealing contact with the surface of a frame for the damper, and an elongated, thin, flexible sealing strip secured to and extending along and beyond that edge of said blade which lies on the down-wind side of said shaft when said blade is in open position generally parallel to the flow of air through the damper frame.

Claim 7

An improved blade for a damper, said blade consisting of two shallow V-shaped, substantially rectangular sheets of metal, the longitudinal edges of one of said sheets being bent around in return lips embracing the edges of the other of said sheets and secured thereto, the two sheets being positioned on opposite sides of a mounting shaft with their edges forming parallel apices lying parallel to and evenly spaced from such shaft, a pair of thin, flexible metal sealing flaps mounted on each end of said blade for wiping sealing contact with the surface of a frame for the damper, and an elongated, thin, flexible sealing strip secured to and extending along and beyond that edge of said blade which lies on the down-wind side of said shaft when said blade is in open position generally parallel to the flow of air through the damper frame.

Claim 8

A damper comprising at least one blade according to claim 5 and an open rectangular frame having two side members and two end members, a shaft for said blade extending between said side members across the opening defined by said frame and a flexible, thin metal sealing strip mounted on and extending across one of said end members for flexed engagement with the edge of said blade when in closed position, said frame mounted sealing strip extending downwardly from said frame member.

Claim 9

A damper according to claim 6 and a gas deflector mounted on and extending along said end member adjacent to and on the up-wind side of said frame mounted sealing strip.

Claim 10

A damper having a rectangular frame consisting of two side members and two end members, said frame members having flat surfaces lying parallel to the direction of air flow through said frame, at least one rectangular damper blade mounted on a transversely extending shaft mechanism for rotating said shaft to move said blade from open to closed position, a thin, flexible sealing strip mounted on the downwind edge of said blade and engageable with another element of said damper when said blade is in closed position for sealing the space therebetween, a fixed sealing strip mounted on one of said end frame members and engageable with the opposite edge of said blade when said blade is in closed position, sealing flaps on the ends of said blade and engaged in wiping contact with the side frame members of said frame, and a gas deflector mounted on said one of said end frame members adjacent to and on the up-wind side of said fixed sealing strip.

Claim 11

A damper having a rectangular frame consisting of two side members and two end members, said frame members having flat surfaces lying parallel to the direction of air flow through said frame, at least one rectangular damper blade mounted on a transversely extending shaft mechanism for rotating said shaft to move said blade from open to closed position, a thin, flexible sealing strip mounted on the downwind edge of said blade and engageable with another element of said damper when said blade is in closed position for sealing the space therebetween, a fixed sealing strip mounted on one of said end frame members and engageable with the opposite edge of said blade when said blade is in closed position, sealing flaps on the ends of said blade and engaged in wiping contact with the side frame members of said frame, and a gas deflector mounted on said one of said end frame members adjacent to and on the up-wind side of said fixed sealing strip.

Claim 12

A damper according to claim 8 in which the fixed sealing strip extends inwardly into the space defined by the frame in a downward direction whereby gas born particles are carried away therefrom by gravity.

Claim 13

A damper having a rectangular frame consisting of two side members and two end members, said frame members having flat surfaces lying parallel to the direction of air flow through said frame, a plurality of evenly spaced, parallel shafts journalled in said side frame members and extending across said frame, a damper blade mounted on and rotatable with each of said shafts, mechanism for rotating all of said shafts simultaneously to move said blades from open to closed position, a thin, flexible sealing strip mounted on the downwind edge of each of said blades and engageable with the opposite edge of an adjacent blade when said blades are in closed position for sealing the space therebetween, a fixed sealing strip mounted on one of said end frame members and engageable with the opposite edge of the adjacent one of said blades when said blades are in closed pOsition, sealing flaps on the ends of said blades and engaged in wiping contact with the side frame members of said frame, and a gas deflector mounted on said one of said end frame members adjacent to and on the up-wind side of said fixed sealing strip.

Claim 14

A damper having a rectangular frame consisting of two side members and two end members, said frame members having flat surfaces lying parallel to the direction of air flow through said frame, a plurality of evenly spaced, parallel shafts journalled in said side frame members and extending across said frame, a damper blade mounted on and rotatable with each of said shafts, mechanism for rotating all of said shafts simultaneously to move said blades from open to closed position, a thin, flexible sealing strip mounted on the downwind edge of each of said blades and engageable with the opposite edge of an adjacent blade when said blades are in closed position for sealing the space therebetween, a fixed sealing strip mounted on one of said end frame members and engageable with the opposite edge of the adjacent one of said blades when said blades are in closed pOsition, sealing flaps on the ends of said blades and engaged in wiping contact with the side frame members of said frame, and a gas deflector mounted on said one of said end frame members adjacent to and on the up-wind side of said fixed sealing strip.

Claim 15

A damper according to claim 10 in which the fixed sealing strip extends inwardly into the space defined by the frame in a downward direction whereby gas born particles are carried away therefrom by gravity.

Claim 16

A reinforced blade for a damper, said blade consisting of a pair of rectangular sheets of metal bent to form opposed, shallow V-shaped blade surfaces, the longitudinal edges of said surface sheets being interfolded and secured to each other and a reinforcing channel secured to and lying between the opposed apices of said surface sheets and extending longitudinally thereof, the ends of said channel being open and adapted to receive mounting axles.

Claim 17

A reinforced blade for a damper, said blade consisting of a pair of rectangular sheets of metal bent to form opposed, shallow V-shaped blade surfaces, the longitudinal edges of said surface sheets being interfolded and secured to each other and a reinforcing channel secured to and lying between the opposed apices of said surface sheets and extending longitudinally thereof, the ends of said channel being open and adapted to receive mounting axles.