Space-saving mattress support

A mattress support, comprising:

• longitudinal beams, which extend next to and at a distance from each other;
• transverse beams that are rigidly connected to the longitudinal beams at or near to the ends of the longitudinal beams, and which together with the longitudinal beams form a main frame;
• a flexible surface material elastically stretched between the longitudinal beams and located at a level distance above a level of an underside of the longitudinal beams;
• a rotatable bracing element located below the flexible support material, which is configured to hold the longitudinal beams apart at a constant transverse width, and
• rotatable coupling means provided at both ends of the rotatable bracing element, which connect the rotatable bracing element to the longitudinal beams, around an axis of rotation that is orthogonal to the longitudinal beams and parallel to the flexible support material;
• wherein the rotatable bracing element is provided with a plastic deformation extending in a direction perpendicular to the axis of rotation, and wherein the rotatable bracing element is pivotally mounted around the axis of rotation between:
• a first extended operational position in which the plastic deformation of the rotatable bracing element extends away from the flexible support material downwards under the level of the underside of the main frame to allow for elastic deformation of the flexible support material, and
• a second folded rest position in which the rotatable bracing element is completely above the level of the underside of the main frame.