SAFETY DEVICE FOR SCREENS ON TUBE, PARTICULARLY FOR TECHNICAL CURTAINS, MOSQUITO NETS, NETS AND ROLLER SCREENS, AND RELATED INSTALLATION AND UN -INSTALLATION PROCESSES OF SUCH DEVICE

摘要

A safety device (1) is described for screens (2) on a tube (3), particularly for technical curtains, mosquito nets, nets and roller screens, comprising: means (5, 6) for loading a spring (7) for actuating the tube (3); and stopper means (16, 18, 19, 20) adapted to assume: (a) a safety position, before assembling the tube (3) in its operating position, in which they keep the spring (7) un-movably and safely loaded; and (b) an opening position, after assembling the tube (3), in which they release the spring (7) allowing the screen (11) placed onto the tube (3) to be unwound and rewound in its use positions. Installation and un- installation processes of such device are also described.