US Patent 7181795 Multi-chamber inflatable bed with unidirectional air inlet unit between chambers

An inflatable bed includes an enclosure member defining a receiving space, an inner partition sheet disposed within the enclosure member and dividing the receiving space into first and second chambers, an air valve attached to the enclosure member and communicating fluidly with the first chamber, and a unidirectional air inlet unit attached to the inner partition sheet and communicating fluidly with the first and second chambers. Air from the first chamber enters the second chamber through the unidirectional air inlet unit.