Lift bed with belt drive

A lift bed comprising a vertically adjustable bed frame and a pulling device for moving said bed frame in the vertical direction, said lift bed comprising two carriages which are secured to an end face of the bed frame such that they are horizontally spaced from one another, each of said carriages being supported such that it is movable on a vertical guide rail by means of rollers, said two carriages being each connected via a pull chain or a toothed belt to a counterweight; each pull chain or each toothed belt is guided over a drive wheel at the upper end of the respective guide rail; the drive wheels are rigidly coupled via a coupler rod; the coupler rod is connected to a main reel which is arranged in vertically spaced relationship with a counterreel; the main reel and the counterreel are interconnected by a drive belt, said drive belt being used for rotatably driving the coupler rod; and the counterreel is adapted to be driven selectively in one direction or the other by means of a motor coupled to a reduction gearing and used for rotating the coupler rod.