Mattress with triple zone topper

Abstract

A mattress comprises a base unit. A topper is supported above the base unit. The topper comprises an elongate rectangular body having a center zone joined between opposite end zones. The topper is of a select foam material of substantially uniform firmness and the center zone has a density greater than density of the end zones. A cover fabric layer surrounds the base unit and the topper.

1 . A mattress comprising: 
 a base unit;    a topper supported above the base unit, the topper comprising an elongate rectangular body having a center zone joined between opposite end zones, the topper being of a select foam material of substantially uniform firmness and the center zone having a density greater than density of the end zones; and    a cover fabric layer surrounding the base unit and the topper.    
     
     
         2 . The mattress of  claim 1  wherein the topper is of polyethylene foam construction.  
     
     
         3 . The mattress of  claim 1  wherein the topper has a planar bottom surface engaging the base unit and a convoluted upper surface.  
     
     
         4 . The mattress of  claim 3  wherein the convoluted upper surface has alternating peaks and valleys arranged in a checkerboard configuration.  
     
     
         5 . The mattress of  claim 3  wherein the convoluted upper surface has a plurality of convolution zones providing different amounts of support.  
     
     
         6 . The mattress of  claim 3  wherein the convoluted upper surface has a different convolution pattern in the center zone than in the end zones to providing different amounts of support.  
     
     
         7 . The mattress of  claim 3  wherein the convoluted upper surface has at least five convolution zones providing different amounts of support.  
     
     
         8 . The mattress of  claim 7  wherein the convoluted upper surface has seven convolution zones providing highest support in a central area and gradually decreasing support at longitudinal ends of the topper.  
     
     
         9 . The mattress of  claim 1  wherein the topper has a planar bottom surface engaging the base unit and a planar upper surface having a plurality of upwardly opening slots in a grid pattern of a first size in the central zone and a second size in the end zones.  
     
     
         10 . The mattress of  claim 1  wherein the center zone has a density at least 25% greater than density of the end zones.  
     
     
         11 . A mattress comprising: 
 a base unit;    a topper supported above the base unit, the topper comprising an elongate rectangular body having a center zone joined between opposite end zones, the topper having a planar bottom surface engaging the base unit and a patterned upper surface, the center zone having a density greater than density of the end zones; and    a cover fabric layer surrounding the base unit and the topper.    
     
     
         12 . The mattress of  claim 11  wherein the topper is of polyethylene foam construction.  
     
     
         13 . The mattress of  claim 11  wherein the topper is of elastic memory foam construction.  
     
     
         14 . The mattress of  claim 11  wherein the upper surface is convoluted having alternating peaks and valleys arranged in a checkerboard configuration.  
     
     
         15 . The mattress of  claim 11  wherein the upper surface is convoluted having a plurality of convolution zones providing different amounts of support.  
     
     
         16 . The mattress of  claim 11  wherein the upper surface is convoluted having a different convolution pattern in the center zone than in the end zones to providing different amounts of support.  
     
     
         17 . The mattress of  claim 11  wherein the upper surface is convoluted having at least five convolution zones providing different amounts of support.  
     
     
         18 . The mattress of  claim 17  wherein the convoluted upper surface has seven convolution zones providing highest support in a central area and gradually decreasing support at longitudinal ends of the topper.  
     
     
         19 . The mattress of  claim 11  wherein the patterned upper surface has a plurality of upwardly opening slots in a grid pattern of a first size in the central zone and a second size in the end zones.  
     
     
         20 . The mattress of  claim 11  wherein the center zone has a density at least 25% greater than density of the end zones.