US Patent 7338039 Spring suspension mat

In a spring assembly, more especially for the cushioning of seats, beds or chairs or all types, including spring legs arranged in pairs, a bridge member extending between each spring leg of a pair of the spring legs, and a connecting member disposed between adjacent spring legs pairs to connect adjacent pairs. The spring leg pairs, bridge member and connecting member may be formed from a one-piece, continuous material, said material having a plurality of bends formed therein. The bends allow the spring leg pairs to fold independently of each other when the bridge member is subjected to a force.