Abstract: The bed is divided into three articulated elements which are interconnected by linkages to allow pivotable movement between the elements for positioning a patient in any one of a plurality of positions. A hydraulic cylinder is operated through a hand actuated valve for raising and lowering the bed portions. A main pivot tube is attached to the base of the bed and provides a hinge joint for two of the bed portions. An eccentric rod extends through the pivot tube and is operative to cause oscillation of the bed.

Abstract: A substantially planar platform having a mattress supported thereon is pivotally attached toward one end to a framework. A bed support structure has a pair of arcuate surfaces which engage the lower face of the platform. The arcuate surfaces are attached to a pair of channel bars which are supported on wedge-shaped elements. The channel bars are pivoted on a common axis and the wedge-shaped elements are moved forwardly by a screw and follower mechanism thereby pivoting the channel bars to move the arcuate supports upwardly against the bottom of the platform. This pivots the platform upwardly. The pivot axis of the channel comprises a tube mounted on an eccentric shaft. The eccentric shaft is rotated under power thereby causing vibration of the entire mechanism resulting in oscillatory motion to relieve stress, strain and tension in the user and aid in the treatment of back and circulatory ailments.