Patent ID: 8359684

Claim:
A spring mattress ( 100 ) that forms an inner space, isolated from the outside environment, in which a number of inner springs ( 110 ) are installed, being spaced apart from each other with a certain interval, the spring mattress comprising: a casing ( 300 ) configured in such a way that an inner portion of the casing forms a receiving part ( 310 ), a back side of the casing forms a coupling part ( 330 ) protruded outwards, and right and left sides of the casing form first air inlets ( 320 ) respectively, wherein the casing ( 300 ) is fixed to an inner front side of the spring mattress ( 100 ) and the receiving part ( 310 ) is open with respect to the outside environment; a module box ( 200 ) detachably installed into the receiving part ( 310 ) of the casing ( 300 ), wherein the module box ( 200 ) has a Positive Temperature Coefficient (PTC) heater ( 230 ), a ventilating fan ( 240 ), and a controller ( 210 ) therein and allows the heater, fan, and controller therein to be separated from the casing ( 300 ) when the module box ( 200 ) is separated from the receiving part ( 310 ), thereby providing convenient repair; and an air guider ( 400 ) configured in such a way that one end thereof is coupled to the coupling part ( 330 ) of the casing ( 300 ), another end of which is coupled to springs via hooks 410 , opposite the inner front side of the mattress ( 100 ), and a heat air outlet thereof ( 420 ) is located at the opposite end of the inner front side of the mattress ( 100 ) inside the inner space, wherein the air guider ( 400 ) is made of a flexible material to prevent the interference with the springs ( 110 ) and withholds a user's weight, wherein the module box ( 200 ) has second air inlets ( 220 ) at two sides corresponding to the first air inlets ( 320 ) when it is inserted into the casing ( 300 ) and allows heated air to be circulated in the module box ( 200 ) and the mattress ( 100 ).