Bed mattress

Abstract

Disclosed is a mattress used for a bed, and more particularly, to a mattress of which resilience is not easily deteriorated and its deformation may be avoided even though it is used for a long time, and cushions on the top and bottom sides of which may be made of materials with different resiliences. The present invention provides a bed mattress which comprises a spring frame 10 with a plurality of springs arranged side by side with certain intervals therein, two pad layers 13 disposed respectively on the top and bottom of said spring frame 10, a side sheet 20 wrapping four sides of said spring frame and two cushion portions 10 a placed respectively on the two pad layers ; characterized in that said cushion portions 10 a comprise a cushion member 60, a cover sheet 70 disposed on or under said cushion member 60, and two envelope sheets 32, first halves of which surround perimeters and bottom surfaces extending therefrom of said cushion members 60 and second halves of which are folded back so as to cover perimetric portions of each said pad layer 13, leaving a gap between the opposing sufaces of the folded first and second halves.

What is claimed is:  
     
         1 . A bed mattress comprising a spring frame  10  with a plurality of springs arranged side by side with certain intervals therein, two pad layers  13  disposed respectively on the top and bottom of said spring frame  10 , a side sheet  20  wrapping four sides of said spring frame and two cushion portions  10   a  placed respectively on the two pad layers, characterized in that said cushion portions  10   a  comprise a cushion member  60 , a cover sheet  70  disposed on or under said cushion member  60 , and two envelope sheets  32 , first halves of which surround perimeters and bottom surfaces extending therefrom of said cushion members  60  and second halves of which are folded back so as to cover perimetric portions of each said pad layer  13 , leaving a gap between the opposing sufaces of the folded first and second halves.  
     
     
         2 . A bed mattress according to  claim 1 , said cushion member  60  is formed by bonding a compressed pad layer  61  and a sponge sheet  62 .  
     
     
         3 . A bed mattress according to claims  1  or  2 , said cushion members  60  are respectively provided with a reinforcing rim  63  interposed between said compressed pad layer  61  and sponge sheet  62  for inwardly and upwardly supporting said compressed pad layer  61 .  
     
     
         4 . A bed mattress according to claims  1  or  2 , said compressed pad layer  61  and sponge sheet  62 , said cushion member  60  and pad layer  13 , and said cushion member  60  and cover sheet  70  are adhered to one another by means of an adhesive applied there between.  
     
     
         5 . A bed mattress according to claims  1  or  2 , said cushion member  60  and pad layer  13  are bound together by one or more binding bands or straps penetrating there through.  
     
     
         6 . A bed mattress according to claims  1  or  2 , said cover sheet  70 , cushion member  60  and pad layer  13  are bound together by one or more binding bands or straps penetrating therethrough.