Convertible mechanism consisting of a top sleeping surface (Jolly Sopra) and a separate bottom bed base (Jolly Sotto) which can be pulled out and raised with the rapid opening system. The sleeping surface is in multilayered beech-wood slats.  20x20 and 30x30 high-resistance tube structure, available with bayonet couplings. Leverage is obtained by an extra thick belt, ensuring maximum durability when repeatedly opened and closed. The structure is painted with fired epoxy powder. This system guarantees excellent protection against possible formation of rust, and makes the mechanism scratch and dent resistant.   The Jolly model can be matched with a polyurethane mattress. Maximum 190 cm in length and 10/12 cm in height.