Modified foam layer and waterbase pillow

Abstract

A bed pillow with a water-bag support base advantageously includes a compressible foam layer above the water-bag base. The foam layer includes an upper portion of a memory foam and a lower density polyurethane foam therebelow. The low density polyurethane foam includes a convoluted base and vertically extending air vent channels are provided throughout at least a central portion of the pillow. With this arrangement improved air flow is provided. The air vent channels also improve localized compressibility whereby the response characteristics of the water-bag base support are maintained and not greatly dissipated.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
         1 . A bed pillow comprising a lower water-bag support with a compressible foam layer supported thereabove;
 said compressible foam layer includes a lower convoluted foam section providing a series of air passages extending across an upper surface of said water-bag support and a generally solid portion of low density foam is provided above said convoluted foam; and wherein   said compressible layer has a series of air vent channels extending through the compressible foam layer and distributed throughout at least a central portion of said bed pillow.   
     
     
         2 . A bed pillow as claimed in  claim 1  wherein said compressible foam layer includes a layer of higher density memory foam above said generally solid portion of low density foam. 
     
     
         3 . A bed pillow as claimed in  claim 1  wherein said series of air vent channels are generally vertically extending ports through said compressible foam layer. 
     
     
         4 . A bed pillow as claimed in  claim 2  wherein said series of air vent channels are generally vertically extending ports through said compressible foam layer. 
     
     
         5 . A bed pillow as claimed in  claim 3  wherein each air vent port is of an area in cross section greater than 4 mm in diameter. 
     
     
         6 . A bed pillow as claimed in  claim 1  wherein the convoluted foam has a grid network of downward extensions. 
     
     
         7 . A bed pillow as claimed in  claim 2  wherein the convoluted foam has a grid network of downward extensions. 
     
     
         8 . A bed pillow as claimed in  claim 7  wherein said grid network has adjacent downward extensions positioned in a square configuration and each square configuration has a large central cavity portion therebetween. 
     
     
         9 . A bed pillow as claimed in  claim 8  wherein the horizontal spacing between immediately adjacent extensions is in the range of 1.5 to 4.0 cm. 
     
     
         10 . A bed pillow as claimed in  claim 8  wherein said series of air vent channels are vertically disposed. 
     
     
         11 . A bed pillow as claimed in  claim 10  wherein said compressible foam layer is 8.0 to 10.0 cm thick and said layer of memory foam is in the range of 1.5 to 4.0 cm.