Air mattress

An air mattress is disclosed, which comprises an upper raw material member which has a coating layer at an upper surface of the same; a lower raw material which is spaced and installed at a lower side of the upper raw material member and has a coating layer at a lower surface of the same; a plurality of fiber threads which vertically connect the upper and lower raw material members and react with respect to an external pressure; a coated side raw material which is fixedly engaged to seal a surrounding portion between the upper and lower raw material members; and an air injection valve engaged at one side of the side raw material. A force distribution function is excellently performed when an external impact is applied to the air mattress according to the present invention, so that a distortion phenomenon of the product is prevented. It is possible to prevent the sides of the air mattress from being abnormally expanded by the side raw material bonded to the upper raw material member and the lower raw material member.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an air mattress, and in particular to an air mattress which is capable of preventing a side portion of the same from being expanded by an air pressure.

2. Description of the Background Art

Generally, a mattress having a wire spring therein has been largely used as a bed mattress. As the time of use of the above mattress increases, the electric force of the wire spring may decrease, so that a recovering force may be lost. So, it is impossible to maintain an inherent shape of the mattress.

When a user lies on the conventional mattress, an over pressure could be applied to the portions of the mattress contacting with a user's body since the elastic force of the wire spring installed in the interior of the mattress is not uniformly applied to the entire portions of a user's body, namely, only certain portions of the user's body are contacted.

Therefore, it is very hard for the user to maintain a proper posture, and the portions of the user's body contacting with the mattress may have big stresses.

So as to overcome the above problems, an air mattress is developed. However, since the side portions of the conventional air mattress may be abnormally expanded due to the air pressure, it is impossible to stably support the user's body. In addition, the outer look of the conventional air mattress having expanded side portions is poor.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an air mattress which is capable of preventing a side portion of an air mattress from being expanded due to an air pressure, while overcoming the problems encountered in the conventional art.

To achieve the above objects, in an air mattress which is elastically contracted or expanded based on a change of an air pressure injected into the interior of the air mattress, there is provided an air mattress which comprises an upper raw material member which has a coating layer at an upper surface of the same; a lower raw material which is spaced and installed at a lower side of the upper raw material member and has a coating layer at a lower surface of the same; a plurality of fiber threads which vertically connect the upper and lower raw material members and react with respect to an external pressure; a coated side raw material which is fixedly engaged to seal a surrounding portion between the upper and lower raw material members; and an air injection valve engaged at one side of the side raw material.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1is a partially cut-away perspective view illustrating part of an air mattress according to a first embodiment of the present invention, andFIG. 2is a cross sectional view illustrating an air mattress ofFIG. 1.

As shown therein, the air mattress according to the present invention comprises an upper raw material member11and a lower raw material member12.

Here, the upper raw material member11and the lower raw material member12are formed of a textile such as a non-woven fabric, etc. A certain quantity of fiber threads is vertically sewed between the upper raw material member11and the lower raw material member12so as to effectively cope with pressure or transformation externally applied to the mattress.

A mattress body10is formed so that a side raw material13formed of a certain raw material is fixedly provided at the opened side portions between the upper raw material member11and the low raw material12.

Here, coating layers11aand12aare formed at the upper surface of the upper raw material member11and the lower surface of the lower raw material member12so that the air is not discharged from the mattress body10to the outside. The side raw material13is preferably coated.

The coating layers11aand12aare made of one among a PVC (polyvinyl chloride) coating, a PE (polyethylene) coating and a PU (polyurethane) coating.

An air injection inlet (not shown) is formed at one side of the side raw material13. The air injection inlet is engaged with an air injection valve15which is adapted to inject air into the interior of the air mattress10or to discharge the air from the mattress body10.

The manufacture of the air mattress according to the present invention will be described as follows.

Namely, the upper raw material member11and the lower raw material member12are arranged in parallel, and the fiber threads14are intensively sewed between the upper raw material member11and the lower raw material member12for thereby connecting the upper raw material member11and the lower raw material member12.

Coating layers11aand12aformed of one among polyvinyl chloride, polyethylene, and polyurethane is formed at the upper surface of the upper raw material member11and the lower surface of the lower raw material member12, respectively.

A longitudinal band shaped side raw material13is bonded or sewed along the sides of the upper raw material member11and the lower raw material member12like surrounding the same.

An air injection inlet is formed at part of the side raw material13, and the air injection valve15is connected at the air injection inlet for thereby finishing manufacture of the air mattress.

In the air mattress according to the present invention, a force distribution function is excellently performed when an external impact is applied to the air mattress according to the present invention, so that a distortion phenomenon of the product is prevented. In addition, it is possible to prevent the sides of the air mattress from being abnormally expanded by the side raw material bonded to the upper raw material member11and the lower raw material member12.

FIG. 4is a partially cut-away perspective view illustrating part of an air mattress according to a second embodiment of the present invention, andFIG. 5is a cross sectional view illustrating an air mattress ofFIG. 4.

As shown therein, the air mattress according to the second embodiment of the present invention is formed in a three-layer structure whereas the air mattress according to the first embodiment of the present invention is formed in one-layer structure.

One mattress body10basically includes an upper raw material member11which has a coating layer11aon its upper surface, a lower raw material member12which is spaced and formed at a lower side of the upper raw material member11and has a coating layer12aon its lower surface, a plurality of fiber threads14which connect the upper raw material member11and the lower raw material member12, a side raw material13which is sealingly bonded to a surrounding portion between the upper raw material member11and the lower raw material member12, with an outer surface of the side raw material being coated, and an air injection valve15which is engaged at one side of the side raw material13. The above mattress body10is stacked in a three-layer structure.

Here, when the mattress body10is stacked in a multiple-layer structure, since a part of the side portions of the stacked structure may be bent, the side portions may be transformed by a vertical load for thereby resulting in a poor outer look.

So, when a plurality of mattress bodies10are stacked, a coated side cover16may be additionally attached to an outer surrounding portion of the stacked structure, so that the sides of each mattress body10can be more stably supported.

Here, the side cover16has a function of surely preventing the discharge of the air and is preferably formed of a PVC tarpaulin so as to enhance touching and durability.

InFIGS. 4 and 5, reference numeral17represents a coating layer with adhesive.

As shown inFIGS. 6A and 6B, the mattress is manufactured by stacking the air mattress up to a desired layer and bonding the same. (In the second embodiment of the present invention, the mattress is preferably stacked in a three-layer structure.

A bonding layer17is formed at the mattress body10of each layer, so that the neighboring mattress bodies10are fixedly bonded with each other.

In a state that the mattress bodies are stacked in a multiple-layer structure, a side cover16is additionally bonded to the side portions of the mattress bodies for thereby supporting the entire structure.

In the air mattress according to the present invention, since the mattress body10is stacked in a multiple-layer structure, it is possible to freely control the air pressure of each layer, so that the height and elastic force of the air mattress can be adjusted. Even when the load is concentrated at the upper side of the air mattress, the entire stacked structure is not transformed, so that it is possible to maintain a parallel and uniform structure of the air mattress.

In addition, even when one among the air mattresses is damaged by an external impact, since the entire air injected in the stacked air mattresses is not discharged, any inconvenience or accident may be prevented during the use of the same.

As described above, the air mattress according to the present invention has the following advantages.

First, an impact absorbing effect is maximized based on a force distribution function when an external impact is applied. In addition, it is possible to prevent a side portion of an air mattress from being abnormally expanded, which problem occurs by a side raw material bonded to the upper raw material member and the lower raw material member.

Second, in the present invention, the air mattresses may be stacked in a multiple-layer structure. With this structure, the air pressure of each layer can be freely adjusted. The heights and elastic force of the air mattress can be adjusted. It is possible to prevent the mattress from being transformed even when an external load is concentrated at the upper side of the air mattress, so that the upper surface of the air mattress can be always maintain in a horizontal state.

Third, in the case that the air mattresses are stacked in a multiple-layer structure, even when one layer of the multiple-layer mattresses is damaged by an external impact, since the air is not discharged from the entire stacked air mattresses, any conveniences or accidents may be prevented.