The invention relates to two frames (1) and (2) that are hingedly connected together by the sides thereof, the hinges (3) including bearings and being connected in a simply manner by means of bolts (14) and end washers (15). The system has the particularity that it incorporates bottom support means, which are stable at one end and rolling at the other, such that raising and lowering are achieved by the actuation of the frame (2) by means of a cylinder (10) that is in turn actuated by a motor (11), the cylinder (10) being hingedly connected by the free end thereof to a crossbar (13) of the frame (2), and the motor (11) being hingedly connected to a crossbar (5') of the frame (1). The tops of the frames end in supports are hingedly connected to plates in the form of forks (7) on which the mattress base to be raised /lowered rests. The profiles used have a quadrangular cross section, such that a simple, easy-to-assemble, and consequently very economical, structure that is suitable for any mattress, is obtained.El sistema comprende dos bastidores (1) y (2) articulados entre sí a través de sus laterales, cuyas articulaciones (3) incorporan rodamientos y se vinculan de forma sencilla mediante pasadores (14) y arandelas extremas (15), con la particularidad de que incorpora medios de apoyo inferiores, estables en un extremo y rodantes en el otro, de manera que la elevación y descenso se consigue mediante el accionamiento del bastidor (2) por un cilindro (10) accionable a su vez por un motor (11), de manera que el cilindro (10) está articulado por su extremo libre a un travesaño (13) del bastidor (2), y el motor (11) articulado al travesaño (5') del bastidor (1). Los bastidores se rematan superiormente en apoyos articulados con pletinas a modo de horquillas (7) sobre las que descansa el somier a elevar/descender. Los perfiles utilizados serán de sección cuadrangular, de manera que se obtiene una estructura sencilla, fácil de montar y consecuentemente muy económica, válida pa
