Height-adjustable bed

Examination bed, adjustable in height, and in an overhanging position, used in a mobile way for medical purposes, notably for tomography by scintigraphy, comprising a pedestal (15), a motor (16) and a patient support (13),

• characterized in that it enables a large-amplitude shifting of the patient support (13) along the vertical, said bed comprising:
• an intermediate carriage (14)
• means (18), actuated by the motor (16), to push the intermediate carriage (14) vertically by making it slide with respect to the pedestal (15)
• a patient support (13) shifting vertically along the intermediate carriage (14)
• a pulley (19) fixed to the intermediate carriage (14) supporting a chain (20) whose ends (26) (27) are fixed to the pedestal (15) and to the patient support (13) in order to be capable of raising the patient support (13) when the means (18) to push the intermediate carriage (14) raise this carriage (14) and, consequently, the pulley (19)
• the pedestal (15) and the patient support (13) comprising skids (21) that slide along four vertical rails (22) fixed to the intermediate carriage (14), two on the pedestal (15) side and two on the patient support (13) side, in order to enable, firstly, the vertical shifting of the intermediate carriage (14) with respect to the pedestal (15) and, secondly, that of the patient support (13) with respect to the intermediate carriage (14)
• the rails (22) having a hexagon-sectioned shape so that the skids (21) cooperate respectively with at least four of the sides of the hexagonal section as to be capable of bearing the patient support (13) and the intermediate carriage (14) in directions perpendicular to the sides of the hexagon so as to prevent the tilting of the patient support (13).