Foam cushion for use with a wheel chair

Claim 1

A foam cushion for a wheel chair seat constructed from a resilient deformable foam material, said cushion having a support surface for evenly dispensing supporting pressure generally over the buttocks of a person's body while disposed in a seated position in said wheel chair, said cushion comprising: a base having a generally planar lower surface supported by said wheel chair; a plurality of one-piece foam springs for supporting and cushioning the body of a person; said foam springs defining a plurality of blocks which are formed integral at a first end with said base and which form at a second end a plurality of generally planar support surfaces; a plurality of longitudinal and lateral channels, the lateral channels terminating at said base at unequal locations from said lower surface, said channels separating said foam springs; and said planar support surfaces of said foam springs lying in a plane which is inclined to the plane of said lower planar surface of said base of said cushion for assisting in person retention in said chair; a pressure relief means formed as a cavity in the bottom surface to extend from substantially a mid-section between front and back walls of said cushion rearwardly to a location in the vicinity of said back wall for relieving pressure against the bony prominence of the buttocks of the person seated on said cushion.