Patent ID: 6857148

Claim:
An adjustable bed base for supporting a person on a mattress loosely lying on the bed base, the bed base comprising a leg part for supporting the lower part of the person's body and a back part for supporting the upper part of the person's body, the back and leg parts together forming an uppermost surface of the bed base intended for loosely supporting a mattress, the back part being adjustable between a lying position in which the back part extends substantially in line with the leg part and an upright position in which the back part forms an obtuse angle (α) with the leg part, the back part being connected to the leg part by an adjusting mechanism which is provided to tilt the back part with respect to the leg part and simultaneously move the back part in the longitudinal and height directions of the bed base, the movement of the back part with respect to the leg part being defined by a predetermined curve which is determined for preventing displacement of a mattress which is loosely supported on said uppermost surface, the adjusting mechanism comprising a first part fixed on the back part and a second part fixed on the leg part, the first and second parts engaging each other and the first part being movable with respect to the second part along the predetermined curve, one of the first and second parts being shaped according to the curve.