Abstract: Innovative mechanism for a divan bed enabling the adjustment in three positions, said “divan”, “relax” and “bed”, comprising padding elements supported by two frames; said frames can reciprocally move by means of two angle-bars, concurrent in a point; one of said angle-bars supports the frame forming the seat of the divan bed and the second one supports the frame forming the back of the divan bed; moreover comprising an articulated quadrilateral which supports said second angle-bar. The mechanism is characterised in that the angle-bars constitute a release mechanism which enables the three positions, stable respect to the divan bed base, while the quadrilater stiffly moves the angle-bars in other three positions. Therefore, the main feature of the mechanism is the univocal positioning between the angle-bars and the quadrilateral elements, without any other additional element as, for example, stop elements like ratchet or pawl.