Bed or mattress

A bed with a mattress or a mattress comprising:

• at least two rests arranged on two sides parallel to each other of a mattress, the rests being adapted to be arranged on respective lifting mechanisms intended to bring the mattress into a position such that it can be rotated by 180° on itself about a horizontal axis, wherein a support for the rest is formed by two extendible elements which converge to form an articulation with lower ends attached to a frame at a distance, a floor or a ceiling and the lifting mechanisms are associated with the bed, formed by cylinders respectively connected with their bases to the floor by means of articulations;
• stems extending from the cylinders, the stems converging into a joint adapted to cooperate with a median axis of rotation of the mattress and wherein the joint is part of an articulated parallelogram and is opposite an articulation of the articulated parallelogram and is connected by means of a wire to the articulation, the wire being able to be wound around a pulley rotatable in the joint and being able to be wound by a winding angle which corresponds to a 180° rotation, a length of the wire being sized so that the wire itself is stretched in the position in which a winding portion of the wire on the pulley is at 180° to be fully unwound bringing the lifting mechanisms into their highest position.