Adjustable base element for furniture for lying on, and furniture for lying on

A base element configured to deform a mattress and/or reclining furniture, comprising:

• a frame element formed of elastically deformable material, in particular of foam material, comprising a bottom surface on a first side and comprising a second side opposite to the first side, wherein the frame element comprises a compartment on the second side;
• an elastically deformable cover layer, wherein the cover layer is arranged on the second side of the frame element so that the compartment is bounded by the cover layer, and wherein the cover layer forms a support surface for a mattress arranged opposite the bottom surface;
• and
• an adjustment device arranged in the compartment of the frame element,
• wherein the adjustment device comprises at least one drive as well as a drive mechanism coupled to the drive and is configured to deform the base element and/or the mattress placed on the base element at least in certain areas,
• wherein the drive mechanism comprises at least two rails which are arranged substantially parallel to a longitudinal axis of the base element and which are spaced apart from each other parallel to a transverse axis of the base element by at least one transverse strut,
• wherein each of the at least two rails comprises at least two rail elements, which are arranged parallel to the longitudinal direction one behind the other and are coupled to each other via at least one joint, so that the at least two rail elements of each rail are displaceable relative to each other via the at least one drive,
• wherein at least one longitudinal support strut is arranged on each of the least two rails for extending the respective rail, and
• wherein the at least one longitudinal support strut is formed of a different material as the respective rail.