The present invention relates to a medical bed (1) comprising a frame (2) at least formed by two longitudinal members (20) integral with a frame (3) equipped with height adjustment means of said frame (2), said frame ( 3) comprising two symmetrical assemblies (3 a, 3b) each comprising at least one first arm (7) whose first end is rotatably mounted relative to the frame (2) on a first axis (X1) parallel to the plane formed by the frame (2) and perpendicular to the longitudinal members (20), said first axis (X1) being mounted to move in translation on the frame (2) along a longitudinal member (20), while a second end is rotatably mounted on a rolling base (4) around a second axis (X2) parallel to the first axis (X1), each assembly (3a, 3b) further comprising at least one second arm (10), a first end of which is rotatably mounted by relative to the frame (2) on a third axis (X3) parallel to the first axis (X1) while a second end is rotatably mounted relative to the first arm (7) on a fourth axis (X4) parallel to the first axis (X1). It is characterized in that it comprises means for translational movement of each assembly (3a, 3b) of the frame (3) with respect to said frame (2) between at least one retracted position and an extended 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 (3 a, 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 d'un deux
