Patent ID: 7540048

Claim:
A support base for a bed mattress comprising: at least two planar portions with at least one rotatable planar portion able to rotate relative to an adjacent planar portion with a planar flexible continuous mattress able to extend over both the rotatable planar portion and the adjacent planar portion; an adjustable support means at least partially mounted on the rotatable planar portion and selectively able to adjust a portion of the mattress resting on the rotatable planar portion out of a plane of extension of the adjacent remainder of the mattress wherein the support base allows for adjustment from a continuous linear formation to a backrest formation with the adjustable support means providing localized support; and a differential displacement member connected to the at least one rotatable planar portion, said differential displacement member engaging said adjustable support means so as to displace the adjustable support means towards a portion of the mattress resting on the rotatable planar portion such that rotation of the at least one planar portion relative to said another causes adjustment of said portion of the mattress out of the plane of extension of the adjacent remainder of the mattress.