Patent ID: 7993244

Claim:
A spring floor system comprising: a wood floor having a lower side; and a plurality of cushioning devices attached to said lower side of said wood floor, each of said devices including: a spring having a first end and a second end, said spring including a first region and a second region longitudinally aligned with said first region, said first and second regions being interposed between said first and second ends, said first region exhibiting a first spring rate, and said second region exhibiting a second spring rate that is greater than said first spring rate; wherein said spring is wound in a helix such that said first region has a first mean diameter and said second region has a second mean diameter, said second mean diameter being less than said first mean diameter; wherein said spring is wound in a helix such that first coils of said first region have a first spacing between said first coils, and second coils of said second region have a second spacing between said second coils, said second spacing being greater than said first spacing; a first cap, said first end being affixed to said first cap; and a second cap, said second end being affixed to said second cap wherein said floor has at least a partially open underside, allowing said first cap to contact a base surface.