Patent ID: 6996866
Filing Date: 2006-02-14
Classification: A47C

Abstract:
1. In a mattress spring structure having: a plurality of coil springs arrayed in longitudinal and traverse rows of such coil springs between upper and lower margins and opposite side margins of said spring structure, with the coils in each row aligned with the others in each said row, the structure including a border piece which defines said upper, lower and side margins; a fastening device securing each coil spring of each traverse row to a coil spring of an adjacent traverse row, a central area of the spring structure being defined by a selected succession of traverse rows of coil springs, wherein the number of traverse rows of coil springs in an upper spring structure area between the upper margin and the central area and in a lower spring structure area between the lower margin and the central area are greater than or equal to the number of traverse rows of coil springs in the central area; and a strengthening structure receivable exteriorly against a major expanse of the spring structure central area, the strengthening structure characterized by: