Water bed mattress

Claim 1

A water bed mattress, comprising: sealed plastic liquid enclosure means for holding a quantity of liquid, said enclosure means including: a horizontal upper wall; a horizontal lower wall beneath said upper wall; a pair of vertical side walls joining the upper and lower walls at opposite sides thereof; a pair of vertical end walls joining the upper and lower walls at opposite ends thereof and joining the side walls at corresponding ends thereof; a peripheral cushion of self-supporting resilient foam material arranged as an interior border within the enclosure, the peripheral cushion having upright outer surfaces in abutment with the interiors of the respective vertical side and end walls, said peripheral cushion having a constant height at its upright outer surfaces equal to the vertical separation between said upper and lower walls and surrounding an interior cavity defined by upright inner surfaces spaced from one another; an interior filling of resilient open cell foam material filling the area of the interior cavity within the enclosure and abutting the inner upright cushion surface; the resiliency of the interior filling being substantially greater than that of the peripheral cushion; said enclosure adapted to be fully filled with liquid material.