Lift mechanism designed to ensure high lifting performance and comfort, facilitating the daily life of the user more needy. Two actuators adjust the different movements in order to ensure infinite positions of use, from closed to TV to relax to lift. The actuator that has the function of extending the footboard also performs a slight tilting action of the seat and backrest; the second actuator instead reclines the backrest until it reaches the position of maximum extension. Both movements are independent of each other, to allow maximum freedom of use. In addition, the vertical-lift system raises the upholstery without rotation for the first 10 cm, allowing the person to adapt to intermediate heights before standing upright.