WATER MATTRESS

To solve problems of a water mattress in which, while comfortable sleep can be obtained by a fluid pressure to hold a body with an equal force, with the use of a difficult-to-stretch material for the purpose of preventing sinking of a lumbago-relating lumbar part, a supporting effect along the whole body is weakened and in which, if a lot of water is sealed in, a user feels sick by the body shake in turning over for example, with the mattress weight further increased to affect handleability.SOLUTION: An water mattress is composed of a square foundation which has a recess made of a rigid material and a sheet which separates an upper surface sheet and the inside into a plurality of regions in a longitudinal direction. The top surface and a separation surface are an elastic sheet having a modulus of longitudinal elasticity of 10 MPa or less. The height of the recess is 1/8th or less and 1/24th or more of the inner dimension in a shorter direction. In each region inside separated in a watertight manner, a fluid like water is sealed in by adjusting so that the body can lie down flat without hitting bottom. The body is widely and evenly supported with the elastic sheet, with the fluid height suppressed to control the shake and the weight. By suppressing the fluid height and using the elastic sheet, the bottom is hit in standing up or getting on and off, thereby preventing the sheet from being damaged.SELECTED DRAWING: Figure 1 【課題】ウォーターマットレスは液圧により体が均等な力で保持され快適が睡眠が得られる一方で、腰痛に繋がる腰部沈み込みを防ぐために伸び難い材料を使用すると体全体に沿い支える効果が薄れ、多量の水を封入すると寝返り時などの揺れで気分が悪くなり、更にマットレス重量は増加し取扱性が劣る。【解決手段】硬質材料からなる凹部を有する四角形状の土台と上面シートと内部を長手方向に複数の領域に分離するシートからなり、上面と分離面は縦弾性係数が１０ＭＰａ以下の弾性シートであり、凹部高さは短手方向内寸の８分の１以下２４分の１以上であり、水密に分離された各領域内部には水等の液体を体がフラットに底つきせず横たわれるよう調節し封入する。弾性シートで体を広く均一に支え、液体高さを抑えて揺れと重量を抑える。液体高さを抑え弾性シートを用いることで起き上がり時や乗り降り時には底つきしシート破損を防ぐ。【選択図】図１