Abstract: Disclosed is an improved innerspring unit for a mattress using a plurality of formed wire elements for support. Enhanced lateral and longitudinal stability of the improved innerspring is provided by one or more stabilizing features including dual formed wire elements, complimentary recesses to secure the intersection of longitudinal and lateral wires and formed wire elements disposed on the edges of the unit which are formed of the same wires which extend longitudinally and laterally across the unit. A variety of different formed wire elements is disclosed, each of which provide different support characteristics. By varying the type, number and location of the different formed wire elements, a particular support profile may be provided which may correspond, for example, to the weight contour of a prone human body.

Abstract: The improved mattress innerspring unit is provided which includes a plurality of coil springs arranged in a plurality of substantially parallel rows, a plurality of cross helicals extending transversely of the rows of coil springs, lacing together adjacent springs along their terminal convolutions in both the upper and lower surfaces of the unit, at least one border wire extending about the perimeter of the unit and at least one cross helical cap mounted on the end revolutions of a cross helical which cap includes a means for restraining movement of the cross helical outward of the unit. The restraining means of the cross helical cap is positioned inward of the border wire and provides a positive abutment for the end revolution of the cross helical, preventing movement beyond the border wire. A cross helical cap is also provided which is adapted to be mounted on the end of a cross helical and restrain movement of the cross helical beyond a border wire of an innerspring unit.

Abstract: A frame for a box spring unit utilizing torsion bar springs comprises a generally rectangular wood frame member and a plurality of parallel transverse metal slats secured to the frame member, the metal slats being adapted to precisely position and firmly secure the base of the torsion bar spring to the metal slat.