Abstract: A mattress employs a first plastic unit which is flat and horizontal and is provided with a peripherally disposed horizontal endless hollow tube which is inflatable. The tube, when inflated, defines a raised peripheral border surrounding and enclosing an inner flat horizontal central area of the first unit. A second plastic unit is removably disposed on top of the central area. The second unit has a first upper section having oppositely disposed inner and outer surfaces, the outer surface being disposed above the inner surface and permanently defining a plurality of closely spaced raised regions which are interconnected by channels disposed below the top surfaces of the regions. The inner surface permanently defines a like plurality of deep recesses, each deep recess constituting the inside of a corresponding region, the deep recesses being interconnected by shallow recesses, each shallow recess constituting the inside of a corresponding channel.

Abstract: A body supporting device comprises a first plastic section having oppositely disposed inner and outer surfaces. The outer surface is disposed above the inner surface and permanently defines a plurality of closely spaced regions of like size and contour which are interconnected by channels disposed below the regions. The inner surface of the first section permanently defines a like plurality of deep recesses. Each deep recess constitutes the inside of a corresponding region. The deep recesses are interconnected by shallow recesses. Each shallow recess constitutes the inside of a corresponding channel. The device further comprises a second plastic section sealed to the inner surface of the first section in a manner at which the deep and shallow recesses communicate with each other. A flexible hollow tube is diposed about the periphery of the sections and is secured thereto. The tube interior is connected via openings in the tube to the shallow recesses.

Abstract: A closed hollow waterproof chamber is disposed below the removable, sectional bottom floor of a building. The chamber is partially filled with water and contains air. The chamber is lined with plastic. A plastic sheet covers the water by resting upon the top surface thereof and is secured to the liner at the periphery in an air-tight manner preventing moisture from entering the building. A solar heat collecting unit is disposed on the roof of the building. The unit has an upper water inlet and a lower water outlet. Both the upper water inlet and the lower water outlet are extended horizontally on the top and the bottom of the solar heat-collecting unit. Water passing through the unit from inlet to outlet is heated by the sun. Water is pumped from the chamber to the inlet and released to flow downwardly to the outlet under the force of gravity and is drained from the outlet to the chamber whereby water in the chamber is heated.