Bent wire spring module

Claim 1

A spring module comprising lower and upper attaching structures, each structure comprising spaced, parallel, straight lengths of wire for attachment to a base frame and correspondingly spaced bent lengths of wire for attachment to a grid frame, a first diagonal length of wire disposed in the plane of the spaced, parallel, straight lengths of wire, said first diagonal length of wire having opposite ends connected to, respectively, the opposite ends of the spaced, parallel, straight lengths of wire, a second diagonal length of wire disposed in the plane of the spaced, bent lengths of wire, said second diagonal lengths of wire having opposite ends connected to, respectively, the opposite ends of the spaced, bent lengths of wire, said first and second diagonal lengths of wire extending diagonally in the planes of the straight lengths of wire and the bent lengths of wire in opposite directions and means yieldably connecting the upper and lower attaching structures comprising oppositely-inclined, upwardly-extending, transversely-spaced first legs situated in spaced, parallel, vertical planes, said first legs being connected at their lower ends to the ends of the parallel lengths of wire opposite the ends connected to the diagonal lengths of wire, oppositely-inclined, downwardly-extending, transversely-spaced second legs situated in spaced, parallel, vertical planes, said second legs being connected at their upper ends to the ends of said bent lengths of wire, horizontally-disposed, transversely-spaced, parallel, in the same plane, symmetrically disposed with respect to the lower and upper attaching structures, third lengths of wire situated in a horizontal plane parallel to the planes of the upper and lower attaching elements and at right angles to the vertical planes of said first and second legs, said third lengths of wire connecting the upper ends of the first legs with the lower ends of the second legs.