Seat Cushion

Abstract

A seat cushion includes two hollow bodies, an inner hollow body of generally a round shape and an outer hollow body surrounding the inner hollow body and of generally a toroid or donut-like shape. The inner hollow body has a gas inlet and a liquid inlet, whereas the outer hollow body has a gas inlet. When filled with a gas, generally air, the outer hollow body forms a firm boundary around the seat cushion to provide a sitter with better sitting stability. When filled with a gas and a liquid, generally air and water, the inner hollow body has free spaces therein for generating liquid surface wave motion and thus is capable of providing a massage effect.

What is claimed is:  
     
         1 . A seat cushion comprising 
 an inner hollow body having a round shape with a predetermined height; said inner hollow body having a gas inlet and a liquid inlet; a caliber of said liquid inletbeing larger than that of said gas inlet, and    an outer hollow body having a shape selected from one of toroid shapes and donut shapes; said outer hollow body having a gas inlet; said outer hollow body surrounding and being bound to said inner hollow body to form said seat cushion;    said outer hollow body being filled with a predetermined amount of gas sufficient to form a firm boundary around said seat cushion so as to provide a stable sitter; said inner hollow body being filled with a predetermined amount of gas and liquid through said gas inlet and said liquid inlet, respectively, so as to produce free spaces within said inner hollow body for generating liquid surface wave motion so as to cause a massage effect.    
     
     
         2 . The seat cushion of  claim 1 , wherein said gas is air.  
     
     
         3 . The seat cushion of  claim 1 , wherein said liquid is liquid.