Patent ID: 7269866

Claim:
An air bed with a stable supporting structure, comprising a periphery sheet, a top sheet, a bottom sheet, a middle sheet, which separates the air bed into an upper air-chamber and a lower air-chamber, a loop of an outer extending strip provided in the upper air-chamber, which separates the upper air-chamber into a peripheral air-chamber and an upper main air-chamber, and a first set of extending strips, which is provided in the upper main air-chamber and consists of a plurality of parallel extending strips; characterized in that the air bed further comprising a second set of extending strips, which is provided in the lower air-chamber, and which includes a plurality of parallel extending strips, and is welded to the middle sheet and the bottom sheet, and an oblique extending strip, which is provided around the second set of extending strips and is welded to the periphery sheet and the bottom sheet to separate the lower air-chamber into a lower main air-chamber and a peripheral auxiliary air-chamber; and the lower main air-chamber includes a space which has a shape of an inverse cone and receives air therein, and an outer surface of the lower main air chamber is concave with respect to an outer surface of the peripheral auxiliary air-chamber, that is, the outer surface of the peripheral auxiliary air-chamber extends beyond the bottom sheet of lower main air-chamber.