Low shear mattress topper constructions

Abstract

Low shear mattress topper constructions have multiple internal topper layers with at least one intermediate layer made of a low shear material and disposed between foam or other layers to reduce frictional shear forces and enable a greater degree of lateral displacement between the topper layers.

1 . A low shear mattress topper package comprising:
 a first foam layer having a generally planar top surface, a generally planar bottom surface parallel to and opposite the generally planar top surface and four side walls perpendicular to and extending between the generally planar top and bottom surfaces;   a fiber layer having a top surface and a bottom surface parallel to and opposite the top surface, the bottom surface of the fiber layer in direct contact with the top surface of the first foam layer;   a second foam layer having a generally planar top surface, a generally planar bottom surface parallel to and opposite the generally planar top surface and four side walls perpendicular to and extending between the generally planar top and bottom surfaces, the bottom surface of the second foam layer in direct contact with the top surface of the fiber layer,   wherein the fiber layer is made of polyester, polyethylene, nylon silk, acrylic, acetate, rayon or a combination thereof.   
     
     
         2 . The low shear mattress topper package of  claim 1 , wherein the first and second foam layers are made of Hypersoft Quilt Polyurethane Foam. 
     
     
         3 . The low shear mattress topper package of  claim 1 , wherein the first and second foam layers are approximately 1-inch thick. 
     
     
         4 . The low shear mattress topper package of  claim 1 , wherein the fiber layer is made of 100% polyester fiber. 
     
     
         5 . The low shear mattress topper package of claim I further comprising a second fiber layer having a top surface and a bottom surface parallel to and opposite the top surface, the bottom surface of the fiber layer in direct contact with the top surface of the second foam layer. 
     
     
         6 . A mattress topper comprising an upholstery layer which overlies at least two internal layers, a first internal layer made of foam, and a second internal layer in contact with the first internal foam layer, the second internal layer comprising at least some fibers, the second internal layer having a shear resistance which is less than a shear resistance of the first internal foam layer. 
     
     
         7 . The mattress topper of  claim 6  wherein the upholstery and internal layers are stitched together. 
     
     
         8 . The mattress topper of  claim 6  comprising at least one additional internal layer. 
     
     
         9 . The mattress topper of  claim 6  wherein the second internal layer is comprised substantially of synthetic fibers. 
     
     
         10 . The mattress topper of  claim 8  wherein a shear force between the second internal layer and the first internal layer is less than a shear force between the first internal layer and the at least one additional layer. 
     
     
         11 . The mattress topper of  claim 6  further comprising a fire resistant material. 
     
     
         12 . The mattress topper of  claim 6  wherein the second internal layer is located between internal layers made of foam. 
     
     
         13 . The mattress topper of  claim 6  wherein the second internal layer has an uncompressed cross-sectional thickness dimension which is less than an uncompressed cross-sectional thickness of the first internal layer. 
     
     
         14 . The mattress topper of  claim 6  wherein the upholstery and internal layers of the mattress topper are substantially connected together at a seam located along a border of a mattress.