Air mattress

1. An air mattress, comprising:

a top sheet and a bottom sheet, the top and bottom sheets being made of a flexible airtight material and being hermetically connected to form an airtight inflatable compartment; and

at least one vertical connecting unit, being disposed within the compartment,

wherein the at least one vertical connecting unit is attached to respective inner surfaces of the top and bottom sheets to form connecting areas;

wherein each vertical connecting unit comprises:

a top connecting member and a bottom connecting member, each of said top and bottom connecting members having a first portion which is attached to the inner surface and a second portion which is not attached to the inner surface; and

an intermediate connecting member, which is connected to the second portions of the top and bottom connecting members,

wherein the top and bottom connecting members respectively comprise top and bottom strips, and the intermediate connecting member corn irises a flexible rope; and

wherein each of the to and bottom strips an elongated band, the band including along its length a plurality of alternating first and second portions.

2. The air mattress of claim 1 , wherein the flexible airtight material comprises Thermoplastic Urethane laminated fabric, which has a Thermoplastic Urethane film having a thickness of from 0.04 to 0.25 mm.

3. The air mattress of claim 1 , wherein the top and bottom strips are made of Thermoplastic Urethane laminated polyester.

4. The air mattress of claim 1 , wherein the connecting areas formed by the top and bottom strips and the top and bottom sheets are at least one of rectangular, rhombic, elliptic, and oval.

5. The air mattress of claim 1 , further comprising:

a side sheet connected to the top and bottom sheets to form the compartment; and

at least one horizontal connecting unit disposed within the compartment, said horizontal connecting unit connected to opposite portions of the side sheet so as to restrain the side sheet in the length and width of the compartment,

wherein the horizontal connecting unit comprises horizontal strips which are attached to opposite portions of the side sheet, and a flexible connecting member, the horizontal strips each having a third portion which is attached to the side sheet to form connecting areas and a fourth portion which is not attached to the side sheet, the flexible connecting member connected to the opposite horizontal strips between corresponding fourth portions of the strips.

6. The air mattress of claim 5 , wherein each of the horizontal strips comprises a band of a material, the band including along its length a plurality of alternating third and fourth portions, and the fourth portions are provided therein with through-holes, through which the flexible connecting member passes.

7. The air mattress of claim 5 , wherein each of the horizontal strips comprises a band of a material, the band including along its length a plurality of alternating third and fourth portions, and the flexible connecting member passes through an enclosed loop formed by the fourth portion, the adjacent third portions and the side sheet.

8. The air mattress of claim 5 , wherein each of the horizontal strips comprises a band of a material, the band including along its width the third and fourth portions, and the fourth portion is provided therein with through-holes, through which the flexible connecting member passes.

9. The air mattress of claim 5 , wherein each of the horizontal strips is configured to be a structure having a “ ”-shaped cross section, with a vertical part and a horizontal part, the vertical part constituting the third portion, the horizontal part constituting the fourth portion, and the fourth portion is provided therein with through-holes, through which the flexible connecting member passes.

10. The air mattress of claim 5 , wherein the top sheet, the bottom sheet, the side sheet and the horizontal strips are made of Thermoplastic Urethane laminated fabrics, which has a Thermoplastic Urethane film having a thickness of from 0.05 to 0.25 mm.

11. The air mattress of claim 5 , wherein the flexible connecting member extending along the length of the compartment is independent of the flexible connecting member extending along the width of the compartment.

12. The air mattress of claim 5 , wherein the flexible connecting member extending along the length of the compartment is cross connected to the flexible connecting member extending along the width of the compartment.

13. The air mattress of claim 5 , wherein the intermediate connecting member of the vertical connecting unit and the flexible connecting member of the horizontal connecting unit are connected with one another at a point.