초록 ▼

The present invention relates to a device for opening out and folding back one or more thermal screens by a plurality of extensible chambers moving over and around guiding hoops, which chambers comprise a piston forming the movable ends of the chambers, which device comprises, close to and under the

The present invention relates to a device for opening out and folding back one or more thermal screens by a plurality of extensible chambers moving over and around guiding hoops, which chambers comprise a piston forming the movable ends of the chambers, which device comprises, close to and under the piston of each retracted air chamber, a deformable membrane borne by a structure and placed in contact with the periphery of the chamber and whose function is to slow down the extension of the chamber when the latter is pressurized, in order to ensure a good air distribution in the inflated part of said chamber and so prevent that part from winding itself around the guiding hoop when the screen is opened out.

대표청구항 ▼

A device for unfolding and for folding back at least one thermal screen inside a structure having a roof with a center, such as a hothouse, said device comprising: a plurality of hoops arranged at spaced intervals inside said structure, each hoop being formed of a tube having an upper end connected

A device for unfolding and for folding back at least one thermal screen inside a structure having a roof with a center, such as a hothouse, said device comprising: a plurality of hoops arranged at spaced intervals inside said structure, each hoop being formed of a tube having an upper end connected to said center inside said structure, and a lower end supported on the ground, a plurality of extensible sleeves, at least some of said hoops being surrounded by one each of said sleeves, each sleeve being an air chamber comprising a first end fixed at the lower end of the respective hoop and a second, movable end comprising a piston having a perforated center and slidable over the respective hoop, said screen having one end fixed to said lower ends of at least some of said plurality of hoops and another end fixed to said piston, said air chambers have helical reinforcements placed inside said chambers, and means for blowing air into said air chambers adjacent there lower ends to thereby cause displacement of the pistons and unfolding of the screen.