A sick-bed includes a bedstead and a bed frame with an adjustable mattress support. The bed frame can be mounted cardanically on the bedstead for the decubitus prophylaxis and can be precessed by means of a drive unit. The bed frame is cardanically suspended on at least three, preferably four lifting drives, which are separate from each other and continuously height-adjustable. The lifting drives are controllable in such a manner that the central normal of the bed frame running through the center of gravity for the bed frame is allowed to carry out a continuous, damped and slow precession movement. Universal joints connecting the lifting drives to the bed frame can allow limited sliding movement therebetween in longitudinal and/or transverse directions.
1. A bed for the decubitus prophylaxis comprising:
a bedstead;
a bed frame mounted on said bedstead, having a generally planar mattress support; having a longitudinal direction, having a transverse direction, and the bed frame being dimensionally rigid;
at least three continuously height-adjustable lifting drives which are separate from each other, each lifting drive being connected between the bedstead and the bed frame with a universal joint, and the lifting drives providing the sole support for bed frame; and
a drive unit connected with the lifting drives and operable to move the bed frame with a precessional frequency in the range of 6° to 36° per minute with a maximum amplitude in the range of 3 to 10 cm in the vertical direction;
wherein at least one of the universal joints permits biaxial sliding between the bed frame and a corresponding lifting drive.
2. A bed for the decubitus prophylaxis comprising:
a bedstead;
a bed frame mounted on said bedstead, having a generally planar mattress support; having a longitudinal direction, having a transverse direction, and the bed frame being dimensionally rigid;
at least three continuously height-adjustable lifting drives which are separate from each other, each lifting drive being connected between the bedstead and the bed frame with a universal joint, and the lifting drives providing the sole support for bed frame; and
a drive unit connected with the lifting drives and operable to move the bed frame with a precessional frequency in the range of 6° to 36° per minute with a maximum amplitude in the range of 3 to 10 cm in the vertical direction;
wherein at least one of the universal joints permits longitudinal sliding between the bed frame and a corresponding lifting drive.
3. A bed for the decubitus prophylaxis comprising:
a bedstead;
a bed frame mounted on said bedstead, having a generally planar mattress support; having a longitudinal direction, having a transverse direction, and the bed frame being dimensionally rigid;
at least three continuously height-adjustable lifting drives which are separate from each other, each lifting drive being connected between the bedstead and the bed frame with a universal joint, and the lifting drives providing the sole support for bed frame; and
a drive unit connected with the lifting drives and operable to move the bed frame with a precessional frequency in the range of 6° to 36° per minute with a maximum amplitude in the range of 3 to 10 cm in the vertical direction;
wherein at least one of the universal joints permits transverse sliding between the bed frame and a corresponding lifting drive.