Patent ID: 7721367
Filing Date: 2010-05-25
Classification: A47C,B29C,B29L,B68G

Abstract:
1. A bed mattress including a spring assembly consisting of a plurality of springs arranged along row and column directions over the entire area of the bed mattress, and a helical coil for securely engaging the springs with one another, the bed mattress comprising: a foaming material; and a permeable reinforcing member formed of a single or multi-layered structure provided between the foaming material and an upper surface of the spring assembly and/or between the foaming material and a lower surface of the spring assembly, the permeable reinforcing member including (i) a plurality of fine holes through which the foaming material can pass and (ii) a plurality of foam expansion holes which are larger than the fine holes and through which a part of the foaming material can be convexedly foamed, the foam expansion holes being spaced apart from each other and arranged along row and column directions at positions above or below the positions where engagement portions between each of the springs and the helical coil exist, the positions where seam portions between the springs exist, and/or the positions where space portions between the springs exist, wherein the permeable reinforcing member is embedded into the foaming material by the foaming material passing through the fine holes of the permeable reinforcing member, and wherein the engagement portions, the seam portions, and/or the space portions are embedded into the convexedly foamed part of the foaming material by the foaming material passing through the foam expansion holes, thereby enhancing bonding force between the spring assembly and the foaming material and preventing a noise that can be generated due to contact between the springs.