초록 ▼

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 heigh

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.

대표청구항 ▼

In a waterbed mattress including a top wall, bottom wall and a peripheral sidewall, all interconnected to define a fluid tight chamber, the improvement comprising, a plurality of bellows spring units within said chamber, each unit having a generally pleated upright peripheral sidewall and opposite t

In a waterbed mattress including a top wall, bottom wall and a peripheral sidewall, all interconnected to define a fluid tight chamber, the improvement comprising, a plurality of bellows spring units within said chamber, each unit having a generally pleated upright peripheral sidewall and opposite top and bottom open ends, each unit being collapsible from a normal expanded height to a shortened compressed height wherein the internal volume of the unit is substantially reduced, and each unit being spring biased to the normal expanded height thereof, and spacer means for supporting said bellows spring units in positional relation to one another within said chamber whereby downward force exerted on said mattress top wall tends to collapse the adjacent units against the spring action of the sidewalls thereof.