Patent ID: 8353501

Claim:
A foam spring comprising: an annular wall having an outside wall surface and an inside wall surface and defining within the inside wall surface a longitudinally extending and hollow interior area, the annular wall including: a first plurality of longitudinally and radially extending sections, each of the first plurality of sections including at least one first relatively thin substantially solid radially extending wall extending from the outside wall surface through to the inside wall surface defining the hollow interior area; a second plurality of substantially solid longitudinally and radially extending sections, each of the second plurality of sections interposed between respective ones of the first plurality of sections forming an alternating sequence of first and second sections around the annular wall, each of the second plurality of sections being relatively thicker than said first walls, and each of the second plurality of substantially solid sections radially extending through the annular wall from the outside wall surface through to the inside wall surface; and wherein, each of the first plurality of sections defines a plurality of apertures radially extending through the annular wall from the outside wall surface through to the inside wall surface, all or a portion of the apertures in each of the first plurality of sections being divided from one another by at least one said first relatively thin radially extending wall.