US Patent 7406727 Foldable foundation for a mattress

A foldable bedding foundation comprising a first section is hingedly secured to a second section so that the bedding foundation may be folded for storage or transportation purposes. Each section has base, a plurality of wire struts pivotally secured to the base, an upper wire grid pivotally secured to the wire struts and braces extending between the base and an outermost wire strut. A lower hinge comprising a piece of wire having a square wave shape is secured to and extends between the bases. An upper hinge is secured to and extends between border wires of the sections. A support assembly is secured to and extends between the first and second sections.