Cushions including flat springs
Cushions include a chassis core having a rigid or semi-rigid base sheet; and a plurality of paired flat springs coupled to the rigid or semi-rigid base sheet, wherein each paired flat spring comprises a lower flat spring including a first terminal end, a second terminal end, and a flexible arcuate member extending from the first terminal end to the second terminal end, and an upper flat spring including a first terminal end, a second terminal end, and a flexible arcuate member extending from the first terminal end to the second terminal end, wherein the first and second terminal ends of the upper flat spring are fixedly attached to respective first and second terminal ends of the lower flat spring such that the upper flat spring is inverted relative to the lower flat spring. Also disclosed are processes for manufacturing the core chassis.
1. A process for manufacturing a core chassis for a cushion, the process comprising:
providing a sheet;
forming one or more lower flat springs in the sheet, each lower flat spring having first and second arcuate members extending from and continuously joined to the sheet with each arcuate portion having a terminal end, wherein forming the one or more lower flat springs in the sheet comprises arranging the lower flat springs in rows and columns on the sheet such that every other lower flat spring is aligned at a 30 to 90 degree offset relative to an adjacent lower flat spring; and
attaching an upper flat spring to the lower flat spring to form a paired flat spring, the upper flat spring comprising a first terminal end, a second terminal end, and a flexible arcuate member extending from the first terminal end to the second terminal end, wherein the first and second terminal ends are coupled to the terminal ends of the lower flat spring to define the paired flat spring.
2. The process of claim 1 , wherein the flexible arcuate members of the upper and lower flat springs has a parabolic shape.
3. The process of claim 1 , wherein the flexible arcuate members of the upper and lower flat springs has an elliptical shape.
4. The process of claim 1 , further comprising attaching an elastomeric member to an apex of two or more upper flat springs.
5. The process of claim 1 , wherein forming the one or more lower flat springs in the sheet comprises arranging the lower flat springs in rows and columns on the rigid such that each paired flat spring is generally perpendicularly oriented relative to an adjacent paired flat spring.