Cushion

Abstract

A support cushion including a first underlying layer made from a flexible foam, at least one side of the first underlying layer being configured with a non-plane surface. The support cushion also includes a second underlying layer made from a flexible foam, at least one side of the second underlying layer being configured with a non-plane surface. The second underlying layer is placed in abutment with the first underlying layer. The support cushion further includes an overlying layer placed in abutment with the second underlying layer, the overlying layer being made from a visco-elastic foam.

1 . A support cushion comprising: 
 a first underlying layer made from a flexible foam, at least one side of the first underlying layer being configured with a non-plane surface;    a second underlying layer made from a flexible foam, at least one side of the second underlying layer being configured with a non-plane surface, the second underlying layer being placed in abutment with the first underlying layer; and    an overlying layer placed in abutment with the second underlying layer, the overlying layer being made from a visco-elastic foam.    
   
   
       2 . The support cushion of  claim 1 , wherein the side of the first underlying layer configured with the non-plane surface is placed in abutment with a side of the second underlying layer configured with a plane surface.  
   
   
       3 . The support cushion of  claim 1 , wherein the non-plane surface of at least one of the first and second underlying layers includes truncated cones.  
   
   
       4 . The support cushion of  claim 3 , wherein the truncated cones have a height between about 15 mm and 30 mm.  
   
   
       5 . The support cushion of  claim 3 , wherein the truncated cones have tops, such that a mutual spacing between about 30 mm and 70 mm exists between the tops of the truncated cones.  
   
   
       6 . The support cushion of  claim 1 , wherein at least one of the first and second underlying layers includes at least one side having the non-plane surface configured in a continuous pattern.  
   
   
       7 . The support cushion of  claim 1 , wherein the second underlying layer is joined together with the first underlying layer by fusing a side of the second underlying with a side of the first underlying layer.  
   
   
       8 . The support cushion of  claim 1 , wherein the second underlying layer is joined together with the first underlying layer by gluing a side of the second underlying with a side of the first underlying layer.  
   
   
       9 . The support cushion of  claim 1 , wherein the overlying layer is placed in abutment with the side of the second underlying layer configured with the non-plane surface.  
   
   
       10 . The support cushion of  claim 1 , wherein the overlying layer is joined together with the second underlying layer by fusing a side of the overlying layer with a side of the second underlying layer.  
   
   
       11 . The support cushion of  claim 1 , wherein the overlying layer is joined together with the second underlying layer by gluing a side of the overlying layer with a side of the second underlying layer.  
   
   
       12 . The support cushion of  claim 1 , further comprising a top layer placed in abutment with the overlying layer, wherein the top layer is made from a visco-elastic foam.  
   
   
       13 . The support cushion of  claim 12 , wherein the top layer has a thickness between about 15 mm and 35 mm.  
   
   
       14 . The support cushion of  claim 12 , further comprising a total thickness of the first underlying layer, the second underlying layer, the overlying layer, and the top layer being between about 220 mm and 280 mm.  
   
   
       15 . The support cushion of  claim 14 , wherein the total thickness is between about 240 mm and 260 mm.  
   
   
       16 . The support cushion of  claim 12 , wherein the overlying layer and the top layer have substantially equal densities.  
   
   
       17 . The support cushion of  claim 12 , wherein the density of each of the top layer and the overlying layer is between about 50 kg/m 3  and 100 kg/m 3 .  
   
   
       18 . The support cushion of  claim 17 , wherein the density of each of the top layer and the overlying layer is between about 80 kg/m 3  and 90 kg/m 3 .  
   
   
       19 . The support cushion of  claim 1 , wherein the overlying layer has a hardness between about 60 N and 100 N.  
   
   
       20 . The support cushion of  claim 1 , wherein the first and second underlying layers are made from a highly elastic polyurethane foam material.