Air mattress

Abstract

An objective of the invention is to provide an integral air mattress capable of preventing caving-in. To achieve the above objective, the present invention provides an air mattress consisting of three sheets 1 to 3 stacked and airtightly sealed at their circumferential portions, the mattress comprising: first-layer air cells 6 a and 6 b consisting of tubular air cells formed widthwise by the first and second sheets 1 and 2 ; and second-layer air cells 8 consisting of tubular air cells formed widthwise by the second and third sheets 2 and 3 , wherein the first-layer air cells 6 a and 6 b and the second-layer air cells 8 are arranged so as not to overlap in the longitudinal direction. The overlying first-layer air cells 6 a and 6 b are set at low pressure so as not to cause bedsores easily, while the underlying second-layer air cells 8 are set at high pressure so as not to cause caving-in easily.

1 . An air mattress consisting of three sheets stacked and airtightly sealed at their circumferential portions, the mattress comprising: first-layer air cells consisting of tubular air cells formed widthwise by the first and second sheets; and second-layer air cells consisting of tubular air cells formed widthwise by the second and third sheets, side surface members being interposed and joined between their respective side edges of the second and third sheets, the side surface members each including two side surface sheets joined on their respective side edges such that the joined portion faces inward,
 wherein the first-layer air cells and the second-layer air cells are arranged so as not to overlap in the longitudinal direction; and   wherein the underlying second-layer air cells are maintained roughly at a predetermined internal pressure, while the overlying first-layer air cells are set at a lower pressure than the second-layer air cells.   
   
   
       2 . (canceled) 
   
   
       3 . (canceled) 
   
   
       4 . The air mattress according to  claim 1 , wherein the first-layer air cells are classified into two alternately arranged systems, such that the two systems are alternately inflated and deflated independently of each other, while the second-layer air cells are maintained roughly at a predetermined internal pressure.