Spa cover with inflatable bladders

1. A spa cover, comprising:

first and second inflatable bladders, each of the first and second bladders made of a drop stitch construction including a top skin, a bottom skin, and a fiber core comprising a plurality of tension fibers extending between the top and bottom skins, the tension fibers structured and spaced between the top and bottom skins to lock the top and bottom skins into a predefined shape when the respective bladder is in a fully inflated state; and

a slipcover having first and second separate chambers together defining a top side of the slipcover and a bottom side of the slipcover, each chamber corresponding to a respective one of the first and second inflatable bladders, wherein each chamber is constructed to house a corresponding one of the first and second inflatable bladders therein in their inflated state, the slipcover having a flexible hinge between the first and second separate chambers,

the slipcover adapted to extend in a first configuration in which the first and second chambers extend side-by-side with the flexible hinge located between the first and second chambers and in which the bottom sides of the first and second chambers extend in a substantially common plane, and a second configuration in which the first chamber is folded back onto the second chamber.

2. The spa cover according to claim 1 , wherein the inflatable bladders have a skin formed of a plurality of layers.

3. The spa cover according to claim 1 , wherein the bladders have a tapered top side.

4. The spa cover according to claim 1 , wherein the bladders have a crowned top side.

5. The spa cover according to claim 1 , wherein the inflatable bladders include at least one tensioning strap that forms a buckle surface on one side of the bladder and a crowned surface on an opposite side of the bladder.

6. The spa cover according to claim 1 , wherein the bladder is inflated with at least one of air and argon.

7. The spa cover according to claim 1 , wherein further comprising insulating fibers loosely spaced between the top skin and bottom skin and between the tension fibers.

8. The spa cover according to claim 1 , wherein the bladder includes at least one valve.

9. The spa cover according to claim 8 , wherein the slipcover includes at least one grommet defining a hole that communicates with a corresponding chamber and wherein the hole is aligned with the valve when the bladder is housed in the chamber.

10. The spa cover according to claim 1 , wherein the top skin extends parallel with the bottom skin when the bladder is in the inflated state.

11. The spa cover according to claim 1 , wherein the top skin extends at an angle with respect to the bottom skin when the bladder is in the inflated state.

12. The spa cover according to claim 1 , wherein at least one of the top and bottom skins are comprised of a plurality of layers.

13. The spa cover according to claim 1 , wherein the tension fibers are woven with the top and bottom skins.

14. The spa cover according to claim 1 , wherein the tension fibers are spaced about ½ inch apart.

15. The spa cover according to claim 1 , wherein the tension fibers are inelastic.

16. The spa cover according to claim 1 , further comprising a bladder banding sealed to the top and bottom skin around the core.

17. The spa cover according to claim 1 , wherein in the second configuration the top side of the slipcover is folded back onto itself.

18. A spa cover, comprising:

first and second inflatable bladders,

each of the first and second bladders made of a drop stitch construction including a top skin, a bottom skin, and a fiber core comprising a plurality of tension fibers extending between the top and bottom skins, the tension fibers structured and spaced between the top and bottom skins to lock the top and bottom skins into a predefined shape when the respective bladder is in a fully inflated state, at least one tensioning strap having a first end attached at one edge of the bottom skin and a second end attached at a position on the bottom skin that is spaced from the edge, the tension strap causing the respective bladder to crown along the top skin between the one edge and the position; and

a slipcover having first and second separate chambers, each chamber corresponding to a respective one of the first and second inflatable bladders, wherein each chamber is constructed to house a corresponding one of the first and second inflatable bladders therein in their inflated state, the slipcover having a flexible hinge between the first and second separate chambers allowing the first chamber to fold back onto the second chamber.

19. The spa cover according to claim 18 , wherein the bladder has a uniform thickness between the top and bottom skin when the bladder is inflated.

20. A spa cover system, comprising:

a spa cover having,

i) first and second inflatable bladders, each of the first and second bladders made of a drop stitch construction including a top skin, a bottom skin, and a fiber core comprising a plurality of tension fibers extending between the top and bottom skins, the tension fibers structured and spaced between the top and bottom skins to lock the top and bottom skins into a predefined shape when the respective bladder is in a fully inflated state; and

ii) a slipcover comprising first and second separate chambers, each chamber corresponding to a respective one of the first and second inflatable bladders, wherein each chamber is constructed to house a corresponding one of the first and second inflatable bladders therein in their inflated state, the slipcover having a flexible hinge between the first and second separate chambers allowing the first chamber to fold back onto the second chamber;

at least one valve provided in at least one of the first and second bladders for inflating the respective bladders; and

at least one container of compressed gas for inflating the first and second inflatable bladders through the at least one valve into the fully inflated state.

21. The spa cover system of claim 20 , wherein the container contains compressed argon gas.