The set of fittings with the main component SI 036-5 is to be used in a sofabed or in a corner unit. Unfolding the sleeping function consists in pulling the backrest forward and lowering it, simultaneousely the seat goes forward. That easy way , we achieve a double, plate surface to lay on . The adventage of the solution is the possibility to build in the bedding box accessible both while unfolded and folded piece of furniture.