US Patent 7409981 Shutter device with guideways

The invention relates to a shutter device intended to close an opening, the shutter (1) being able to be moved downwards and upwards between an open position and a closed position, this shutter (1) having flexible or articulated roughly continuous lateral edges (8, 9) running with respect to guideways (10, 11) mounted on fixed supports (12) on each side of the opening, means being provided to allow a passage to be created between the guideways (10, 11) that is wider than the distance between the lateral edges (8, 9) of the shutter (1) when the latter is in the open position.