Abstract A device for closing a round hot air or exahust gas duct comprises a symmetrically mounted pivoted flap having a pivot web portion centrally pivoted in said duct and a substantially cylindrical flap wing with a peripheral closing edge. The flap is arranged inside of a flexible cylindrical insert of thin metal or plastic material which is arranged in the duct so that it is spaced radially inwardly from the interior wall thereof. The insert is connected to and sealed with the duct on at least one end face. The inside diameter of the insert is slightly smaller than the outside diameter of the flap wing, and the flap wing is provided with a circumferentially extending rib which is attached to the flap wing adjacent the closing end thereof.
A device for closing a round hot air or exhaust gas duct, comprising a symmetrically mounted pivoted flap having a pivot web portion and a substantially cylindrical flap wing with a peripheral closing edge, a flexible cylindrical insert of thin material arranged in the duct in the range of and extending around said flap, said insert having at least one of its two ends sealed with said duct, the inside diameter of said insert being slightly smaller than the outside diameter of said flap wing, and a closed annular circumferentially and axially extending rib attached at least on the downstream side of said flap wing adjacent to said closing edge.
Claim 2
Independent Claim
110 words
A device for closing a round hot air or exhaust gas duct, comprising a symmetrically mounted pivoted flap having a pivot web portion and a substantially cylindrical flap wing with a peripheral closing edge, a flexible cylindrical insert of thin material arranged in the duct in the range of and extending around said flap, said insert having at least one of its two ends sealed with said duct, the inside diameter of said insert being slightly smaller than the outside diameter of said flap wing, and a closed annular circumferentially and axially extending rib attached at least on the downstream side of said flap wing adjacent to said closing edge.
Claim 3
Dependent Claim
51 words
A device for closing a round hot air or exhaust gas duct, according to claim 1, wherein said insert end which is sealed with said duct comprises a flange extending into sealing engagement with said duct wall and an annular flexible diaphragm surrounding said duct on the exterior of said flange.
Claim 4
Dependent Claim
38 words
A device for closing a round hot air or exhaust gas duct, according to claim 1, wherein said circumferential rib comprises a sleeve substantially parallel to the wall of said insert and defining a very small gap therewith.