Bent wire spring unit

Claim 1

A bent wire spring unit comprising first spaced, parallel attaching elements adapted to be attached at longitudinally and transversely-spaced intervals to pairs of spaced, parallel grid wires of the grid frame and the support members of a base frame of a spring assembly comprising a base frame and a grid frame wherein the grid frame comprises a border wire and crossing grid wires attached at their ends to the border wire and the base frame comprises rectangularly-arranged, spaced, parallel end and side members and longitudinally-spaced, parallel support members fixed at their opposite ends to the side members, and spaced, parallel, C-shaped lengths of wire disposed between the attaching elements and connected thereto, said C-shaped lengths of wire being disposed in planes perpendicular to the planes of the attaching elements and at a spacing corresponding to the length of the attaching elements and each comprising a first length of wire connected at one end to one end of the top attaching element and inclined downwardly from said one end, said first lengths of wire being inclined downwardly in opposite directions, second lengths of wire connected at one end to one end of the bottom attaching element and inclined upwardly, said second lengths of wire being inclined in opposite directions, third lengths of wire perpendicular to the top and bottom lengths of wire connected at their upper and lower ends with the inclined lengths of wire and diagonal lengths of wire situated in the planes of the top and bottom attaching elements connected at their opposite ends to the other ends of the top and bottom attaching elements.