Blocking device aganist lifting a louvrable roller shutter having unfolded lamellae

摘要

The device (9) has a retractable stop (90) movable between a retracted position in which the stop is recessed with respect to an apron, and a deployed position in which the stop cooperates with the apron for preventing folding of the apron. A control unit (93) cooperates with a directional blade, where orientation of the blade is controlled for controlling a passage of the stop from the retracted position to the deployed position under the effect of folding of the apron. An independent claim is also included for a screening device.