| 摘要 |
A body support member fabricated of an open-cell polyurethane foam sheet, such sheet having a plurality of chevron-shaped ridges projecting from one flat surface of the sheet and extending between opposite side edges of the sheet. Each chevron-shaped ridge has a single bend therein along its length dimension, such bend occurring at the approximate mid-point of such length dimension. The ridges alternate with similarly shaped valleys so that substantially one entire surface of the sheet is made up of such alternating ridges and valleys. The preferred ridges are of a hyperbolic geometry in cross section. The height of each ridge above the surface of the sheet, and the spacing between adjacent ridges preferably are selected to provide the desired support of the body member above the surface. Deflection of the ridges due to body pressure applied there against deforms the ridges causing adjacent ridges to contact one another and provide an infinitely increasing degree of resistance to collapse of the ridge, hence support of the body member. The bent ridges develop air circulation channels along the valleys as the ridges contact one another.
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