PROBLEM TO BE SOLVED: To solve problems that conventionally an air cushion is inflated with a mouth or by a method of providing a machine with a function of the mouth, which is to suppress the outflow of the air to the minimum, however, the suppression itself is quite hard work, the use of the machine requires a storage place for itself and is inconvenient, and a market for the water cushion or the like is not opened so far due to the inconvenience of the air cushion itself, which obstruct to find a further idea.;SOLUTION: The property of the air is well understood and the leakage of the air is prevented by the injected air itself using a pressure without using the mouth (machine). The sealing/opening are simply performed. The aesthetic appearance of sealing/opening ports is improved. This invention based on the idea succeeds in simply injecting and sealing the air and water. This method secures a user amenity in various situations.;COPYRIGHT: (C)2006,JPO&NCIPI
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