Device with a shutter which may be wound around a drum
The invention relates to a flexible shutter device, designed for closing a bay or other opening which cooperates with drive means which permit a displacement of the flexible shutter between an open position and a closed position. The device comprises a drum which may turn about the axis thereof and about which the flexible shutter is wound in the open position thereof, forming a roll comprising turns made up of successive layers attaching one to the other and from which the flexible shutter can be unwound and pushed into the closed position thereof. Slides mounted on a fixed support provide guidance along the bay for the unwound part of the flexible shutter. Pressure or restriction elements ( 33, 50, 66 ) avoid buckling of the lateral edges ( 2,3 ) in the supported part thereof, extending between a first end ( 30 ) of the slides ( 4,5 ), nearest the roll and the roll.
1. Flexible shutter device intended for closing a window or door opening or any type of opening, comprising:
a shutter comprising lateral edges,
driving means for moving the shutter between an open position and a closed position, the driving means comprising a motor-driven drum and a spindle, the drum rotatable about its spindle, around which the shutter is wound in its open position forming a roll consisting of turns formed by successive layers attached to one another and from which the shutter can be unwound and pushed by rotation of the drum by the motor towards its closed position,
slideways mounted on a fixed support for guidance, along the opening, of the lateral edges of the non-wound part of the shutter, the lateral edges being substantially non-compressible, the slideways having a U-shaped cross-section including a rear arm, a front arm and a central part, the central part of which is up against the structure of the opening, the two arms of the U-shaped cross-section of the slideways each being disposed in a plane parallel to the plane of the shutter,
characterized in that the device comprises confinement elements comprising an extension of the rear arms of each slideway towards the roll, which consists of a pressure element having a concave curvature with respect to the drum, so as to obtain a radial thrust force resultant that continuously applies the lateral edges of the shutter on the pressure element between a first end of the slideways being closest to the roll, and the roll, and preventing buckling of the lateral edges of the shutter there between, and in that the shutter lacks any ballasting.
2. Device according to claim 1 , characterized in that the lateral edges of the shutter have a bead projecting with respect to the plane of the shutter extending between the lateral edges.
3. Device according to claim 1 , characterized in that the slideways are substantially straight and have, in their top part just below the pressure element, an inclination with respect to the plane of the slideways moving the top end of the slideways away from the drum.
4. Device according to claim 1 , characterized in that the pressure element comprises a flexible guide.