专利名称：INFLATABLE SWIMMING POOL COVER 发明人：KOLIOMICHALIS P,US
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申请号：US3747131D
申请日：19711214
公开号：US3747131A
小行星撞击地球
此山中关公怎么死的公开日：
四年级数学口算题19730724
专利内容由知识产权出版社提供
石榴的作用
摘要：A cover for swimming pools and the like comprising a first continuous sleeve forming a ballast which is immerd in the pool around the perimeter thereof. A cond continuous air-filled sleeve positioned immediately above the ballast limits the immersion level of the ballast. A sheet of plastic of suitable gauge is aled to the air-filled sleeve and covers the pool. A valve is provided in the aforementioned flexible sheet for filling a hollow region defined by the sheet and the surface of the water with air. An apron provided around the perimeter of the sheet prevents the collection of water
and/or debris. The apron may be anchored by a ballast sleeve and/or a plurality of stakes. As an alternative arrangement the first sleeve may be filled with both air and water in combination to rve the function of both the ballast and the buoyancy structures.儿童福利院
申请人：KOLIOMICHALIS P,US
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