Spring unit

Claim 1

A bent wire spring unit for disposition between a base frame and a grid frame comprising vertically-spaced, parallel top and bottom attaching elements and vertically-disposed, spaced, parallel supports connecting the top and bottom attaching elements such as to permit the top and bottom attaching elements to move relative to each other in response to pressure applied perpendicularly to the top attaching elements, said supports comprising vertical lengths of wire of lesser length than the distance between attaching elements and vertically-spaced upper and lower V-shaped lengths of wire defining downwardly-inclined lower legs and upwardly-inclined upper legs, said upper legs of the lower V-shaped lengths of wire being connected to the lower ends of the vertical lengths of wire and said lower legs of the upper V-shaped lengths of wire being connected to the upper ends of the vertical lengths of wire, said vertical lengths of wire and said inclined lengths of wire comprising the supports being disposed in perpendicular spaced, parallel planes with the vertical length of wire disposed in spaced, parallel relation to each other, both transversely and longitudinally and with the legs of the V-shaped lengths of wire extending from said vertical lengths of wire in opposite directions.