The present invention relates to a medical bed (1) having a frame (2) formed at least from two parallel side members (20) secured to a chassis (3) equipped with means for adjusting the height of said frame (2), said chassis (3) having two symmetrical assemblies (3a, 3b), each having at least one first arm (7), a first end of which is mounted so as to rotate with respect to the frame (2) on a first axis (X1) parallel to the plane formed by the frame (2) and perpendicular to the side members (20), said first axis (X1) being mounted so as to be able to move in translation on the frame (2) along a side member (20), while a second end is mounted so as to rotate on a rolling base (4) about a second axis (X2) parallel to the first axis (X1), each assembly (3a, 3b) also having at least one second arm (10), a first end of which is mounted so as to rotate with respect to the frame (2) on a third axis (X3) parallel to the first axis (X1) while a second end is mounted so as to rotate with respect to the first arm (7) on a fourth axis (X4) parallel to the first axis (X1). It is characterized in that it has means for moving each assembly (3a, 3b) of the chassis (3) in translation with respect to said frame (2) between at least one retracted position and a deployed position of said rolling base (4).La présente invention concerne un lit médicalisé (1) comportant un cadre (2) au moins formé par deux longerons (20) parallèles solidaires d'un châssis (3) équipé de moyens de réglage en hauteur dudit cadre (2), ledit châssis (3) comportant deux ensembles (3a, 3b) symétriques comportant chacun au moins un premier bras (7) dont une première extrémité est montée en rotation par rapport au cadre (2) sur un premier axe (X1) parallèle au plan formé par le cadre (2) et perpendiculaire aux longerons (20) ledit premier axe (X1) étant monté mobile en translation sur le cadre (2) le long d'un longeron (20), tandis qu'une deuxième extrémité est montée en rotation sur une embase roulante (4) autour
