Abstract: The invention concerns a device with a curtain which can be rolled up and unrolled between a shut position and an open position, whereby this curtain (1) comprises a belt (2,3) on each of its faces, whereby each belt (2,3) has successive teeth (5,6) in the longitudinal direction, whereby these belts (2,3) are situated opposite one another in such a way that they can mesh when the curtain (1) is being rolled up. At least one of these belts (2,3) comprises teeth (5,6) having at least one recess (8,9) in which at least one protruding part (10,11) of the teeth (5,6) of the other belt (2,3) can engage in such a way that the two belts (2,3) can mesh and such that one of these belts (2,3) can push the other belt (2,3) in their longitudinal directions.

Abstract: The invention concerns a device with a curtain (2) that can be rolled up and unrolled between a shut position and an open position comprising, near the lateral edges (3) on each face, a serrated belt (1,6) extending parallel to said lateral edges (3), whereby each of the belts (1,6) has successive teeth (5,8). The lateral face of the teeth, extending in the longitudinal direction of the corresponding lateral edge (3) of at least one of the belts (1,6) provided on a face of the curtain (2) rests on a supporting element when the curtain (2) is rolled up. This supporting element is provided on the other face of the curtain (2).

Abstract: The present invention concerns a method for producing a shutter (2) designed to be rolled up and unrolled, characterized in that on each face, opposite one another, is provided a serrated belt (3,4) comprising a succession of teeth, and in that, in order to make it possible for both belts (3,4) to mesh, the position of the teeth of at least one of the belts (3,4) is adjusted by deforming said belt (3,4) in such a way that both belts (3,4) can mesh, and that this mutual position of the belts (3,4) can subsequently be stabilized.

Abstract: A device for driving a drum (1) about the axis thereof, including a motor (2) which is mounted at least partially inside the drum (1) and a transmission (7) disposed between the motor (2) and the drum (1), characterized in that it further includes a device (10) enabling a forced current of cooling air to be created in a space (13,14) between the motor (2) and an inner wall of the drum (1).