Coil spring mattress construction

Abstract

A more versatile pocket coil mattress provides increased support in the perimeter side regions of the mattress in combination with increased support in the main sleeping area. The shape, preloading and characteristics of the pocket coil springs has changed to decrease compression per unit of force applied while still maintaining the desired user response of a pocket coiled mattress.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
         1 . A mattress comprising a main sleep area surrounded by perimeter support region with both the main sleep area and the perimeter support region being defined by wire coil springs contained within fabric pockets; the wire coil springs in the main sleep area are arranged in honeycomb offset rows; the wire coil springs in the perimeter support region are of a different wire construction having different flex characteristics relative to the wire coil springs in the main sleep area; said wire coil springs in said perimeter support region are arranged to define at least two side by side rows about the mattress; and wherein said wire coil springs of said perimeter support region define four corner regions of the mattress with each corner region including at least 8 wire coil springs cross connected and joining adjacent wire coil springs of the respective row and adjacent wire coil springs of opposite rows; said wire coil springs of the perimeter region cooperating to allow said wire coil springs between said corner regions to accommodate substantial resilient bending of said mattress in a length thereof. 
     
     
         2 . A mattress as claimed in  claim 1  wherein said wire coil springs of said perimeter region are of a smaller spring coil diameter relative to the diameter of the wire coil springs of said main sleep area. 
     
     
         3 . A mattress as claimed in  claim 2  wherein said wire coil springs of said perimeter region have a gauge of about 14.5. 
     
     
         4 . A mattress as claimed in  claim 3  wherein said wire coil springs of said main sleep area have a gauge of about 15.5. 
     
     
         5 . A mattress as claimed in  claim 3  wherein said wire coil springs of said perimeter region are of a diameter of about 2 inches at the ends thereof and taper inwardly to a narrow waist of about 50 mm. 
     
     
         6 . A mattress as claimed in  claim 2  wherein said perimeter support region includes at least 3 rows of wire coil springs and said wire coil springs are of a gauge of between 14 and 15. 
     
     
         7 . A mattress as claimed in  claim 6  wherein said wire coil springs of said perimeter region are connected at both ends of said coil springs. 
     
     
         8 . A mattress as claimed in  claim 7  wherein said perimeter support region on a top surface and a bottom surface is connected by a flexible high strength mesh. 
     
     
         9 . A mattress as claimed in  claim 1  wherein the wire coil springs in said perimeter support region have a preload force of at least 970 grams. 
     
     
         10 . A mattress as claimed in  claim 9  wherein the wire coil springs in said main sleep area have a preload force of at least 490 grams. 
     
     
         11 . A mattress as claimed in  claim 10  wherein the wire coil springs in said perimeter support region have a preload force in the range of 970 to 1000 grams. 
     
     
         12 . A mattress as claimed in  claim 11  wherein the wire coil springs in said main sleep area have a preload force in the range of 490 to 520 grams.