Cushion
A technology of air cushions and air chambers, which can be used in liquid-filled cushions, medical science, hospital beds, etc. It can solve the problems of high friction and achieve the effect of small friction and preventing bedsores
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[0029] Figure 6-8 Air cushion 5 is shown in . A total of four flexible rectangular sheets, the first to fourth sheet materials 6, 7, 8, 9 are stacked in sequence and bonded to each other along the periphery to form a sealed structure with three spaces.
[0030] The first and second sheets 6 and 7 are bonded in point form by the first bonding portion 10 . A plurality of such first bonding portions 10 are provided at predetermined intervals along a straight line in the vertical and horizontal directions. The arrangement of this first bonding portion 10 has the relation that forms quadrilateral 12 (shown by dot-dash line) with adjacent 4 first bonding portions 10, promptly has to make the first bonding portion 10 be located in the corner of quadrangle 12 Relationship. The quadrilateral 12 is preferably a square, but may also be a rectangle. A first air chamber 13 is formed between the first and second sheets 6,7.
[0031] The second and third sheet materials 7 and 8 are bon...
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