Waterbed mattress with bellows spring insert

摘要

A waterbed mattress includes a spring insert having a plurality of open ended bellows spring units arranged in upright relation within the mattress. The pleated peripheral side wall of each bellows spring unit enables it to be collapsible from a normal expanded height to a shortened compressed height wherein the internal volume is substantially reduced. Each bellows spring unit is spring biased to its normal expanded height. The bellows spring units are snap fit into holes a spacer panel which serves to position the bellows spring units relative to one another a valve cover sheet may overlay one or both ends of the bellows spring units and have holes registered with the open ends of the bellows units to impart a hydraulic action to them in addition to their inherent spring force.