Vessel of synthetic, thin, flexible material - has closed pocket filled with gas under pressure

摘要

Vessel comprises, besides its main cavity, at least one closed pocket filled with a gas under pressure, for instance, slightly compressed air. The bottom and lateral surfaces are made of a composite synthetic material with internal welded seams. The two V folds in the bottom are parallel to the lateral surfaces along the length and have the bevelled edges independently welded. The two V folds are joined together just up to the welded edges. A set of such identical contiguous vessels, eventually closed and contg. a liq. joined along the welded edges by a narrow joint of synthetic material and by at least one of the end vessels of the set, are joined in the same way with a terminal handle. Each terminal handle comprises one or two closed pockets of synthetic and flexible material which contain a gas under pressure, for example, slightly compressed air.