Highly stable and slowly adjusted air inflation cushion

Abstract

A highly stable and slowly adjusted air inflation cushion has: a lower sheet being a sheet like structure; an upper sheet adhered on an upper side of the lower sheet; the upper sheet including a polarity of air inflation cells each of which have a hollow central space; each air inflation cell being an approximate rectangular bottom; a polarity of channels; two adjacent air inflation cells being connected by a respective one of the channels for communicating the air inflation cells connected thereto so that air in the air inflation cells flows from one to another; and wherein a cross section area of the channel is inversely changed with (or inversely proportional to) a pressure applied on an upper side of the channel. A cross section of the channel becomes smaller and smaller from an inner side toward an outer side of the air inflation cushion.

What is claimed is: 
     
         1 . A highly stable and slowly adjusted air inflation cushion, comprising:
 a lower sheet being a sheet like structure;   an upper sheet adhered on an upper side of the lower sheet; the upper sheet including a polarity of air inflation cells each of which have a hollow central space; and   a polarity of channels; two adjacent air inflation cells being connected by a respective one of the channels for communicating the air inflation cells connected thereto so that air in the air inflation cells flows from one to another; and   wherein a cross section area of the channel is inversely changed with a pressure applied on an upper side of the channel.   
     
     
         2 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein the cross section area of the channel is inversely proportional to the pressure applied on the upper side of the channel. 
     
     
         3 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein by adjusting an interior cross section of the channel, a gap between two opposite lateral sides of the air inflation cell and a height of the air inflation cell, when a weight of a person lying on the air inflation cushion is between 50 to 100 kilograms, the reduction of the height of each air inflation cell is about 1 inch. 
     
     
         4 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein when a pressure applied by the person lying on the cushion is 80 kilogram/0.8 square meters ±10%, an interior cross section of the channel is 12 mm2±15%. 
     
     
         5 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 4 , wherein the interior cross section of the channel has a rectangular shape with an area of 8 mm×1.5 mm±15%. 
     
     
         6 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 5 , wherein the channel has a n shape with a width between two lateral sides of 8.6 mm±15% and a height of the channel is 2.1 mm±15%. 
     
     
         7 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein a cross section of the channel becomes smaller and smaller from an inner side of an air inflation cell near an inner side of the air inflation cushion toward another air inflation cell near an outer side of the air inflation cushion. 
     
     
         8 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 7 , wherein a rate of reduction of the cross section of the air inflation cell is linear. 
     
     
         9 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 7 , wherein the channel is only suitable for the outermost two circles of the air inflation cells, that is, the another air inflation cell is at an outermost side of the air inflation cushion. 
     
     
         10 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 6 , wherein a widest side of the channel has a width of 5 mm and a narrowest side of the channel has a width of 1 mm. 
     
     
         11 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 7 , wherein an opening of the narrow side of the channel toward the inner air inflation cell are extended with two extension sheets. 
     
     
         12 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein material of the lower sheet, the upper sheet and the channels is selected from silicon and rubber. 
     
     
         13 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 12 , wherein the rubber is a rubber No. 419C. 
     
     
         14 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein the air inflation cell has an approximate rectangular shape and an upper side of each air inflation cell has an approximate rectangular plane. 
     
     
         15 . The highly stable and slowly adjusted air inflation cushion as claimed in  claim 1 , wherein an air nozzle is installed to one of the air inflation cells and is at two adjacent sides of the air inflation cell for inflating air to the air inflation cells.