Abstract: A device for regulating the airflow in an air damper including a twist sleeve of flexible material, the cross section of which substantially conforms to, an outer tube in which the flow takes place, one end of the twist sleeve being disposed on the inner side of the outer tube and the other end of the twist sleeve being disposed in a tube sleeve which can be rotated under an axial displacement controlled in relation to the rotation. The tube sleeve may be provided with a helical slot. A guide pin is arranged on an inner side of the outer tube, which guide pin goes down into the helical slot. The operating apparatus comprises two cords, which cords are provided with fastenings against the tube sleeve and run along opposite circumferential directions of the tube sleeve between the outer tube and the tube sleeve.

Abstract: A device for regulating the airflow in an air damper is disclosed. In at least one embodiment, the device includes a twist sleeve of flexible material, the cross section of which substantially conforms to an outer tube in which the flow takes place, one end of the twist sleeve being disposed on the inner side of the outer tube and the other end of the twist sleeve being disposed in a tube sleeve which can be rotated under an axial displacement controlled in relation to the rotation. In at least one embodiment, the outer diameter of the tube sleeve is somewhat smaller than the inner diameter of the outer tube, so that the tube sleeve slides easily in the outer tube, and in which the tube sleeve is provided with a helical slot, and in which the rotation of the tube sleeve is achieved by an operating apparatus configured in such a way that the operating apparatus pulls round the tube sleeve, at the same time as the tube sleeve moves axially.

Abstract: A device for airflow regulation in an air damper is disclosed. The device includes a twist sleeve of flexible material, the cross section of which substantially conforms to an outer tube in which the flow takes place, one end of the twist sleeve being disposed on the inner side of the outer tube and the other end of the twist sleeve being disposed in a tube sleeve which can be rotated under an axial displacement controlled in relation to the rotation. The outer diameter of the tube sleeve is smaller than the inner diameter of the outer tube, so that the tube sleeve slides easily in the outer tube. The tube sleeve is provided with a helical slot. The rotation of the tube sleeve is achieved by a gearwheel adapted to cooperate with the helical slot to pull around the tube sleeve.

Abstract: A device for regulating the airflow in an air damper is disclosed. In at least one embodiment, the device includes a twist sleeve of flexible material, the cross section of which substantially conforms to, an outer tube in which the flow takes place, one end of the twist sleeve being disposed on the inner side of the outer tube and the other end of the twist sleeve being disposed in a tube sleeve which can be rotated under an axial displacement controlled in relation to the rotation. In at least one embodiment, the outer diameter of the tube sleeve is somewhat smaller than the inner diameter of the outer tube, so that the tube sleeve slides easily in the outer tube, and in which the tube sleeve is provided with a helical slot, and in which the rotation of the tube sleeve is achieved by an operating apparatus configured in such a way that the operating apparatus pulls round the tube sleeve, at the same time as the tube sleeve moves axially.