Abstract: An edge support system for a mattress foundation. The edge support system includes a pair of torsion elements, each including a central torsion segment, with the torsion segments being secured to one another, and with the torsion elements being formed as mirror images of one another, with legs being attached to the top and bottom border members of the mattress foundation. A secondary expansion spring is connected between the attached torsion segments and an intermediate rod located midway between the border members of the foundation. The gauge of the wire forming the torsion elements and the strength of the expansion spring determine the amount of support by the edge support system. A plurality of the system can be spaced about the periphery of the foundation to provide greater firmness in areas needing enhanced stiffness.

Abstract: A bent wire spring module provided with spirally-formed attaching elements at its upper end for interengagement with the border wires of a grid frame.

Abstract: A box spring is condensed along its depth dimension and then packaged in this depressed state for storage and/or transportation. At its point of use, the box spring is unpackaged and expanded along its depth dimension for use. Within the box spring are a plurality of support springs movable from retracted, unstressed positions enabling the aforementioned compaction of the box spring, to extended positions which provide the resilient support of the box spring when placed into use. In the preferred form of the invention, the springs are made from spring wire or similar material formed into a sinusoidal shape including generally coplanar wavy or sine portions. The springs are mounted such that movement of the upper support surface of the box spring relative to the base will cause the springs to move into their extended or erect positions to provide resilient support for use of the box spring or to enable the box spring to be depressed into a compact mass for storage or shipment.