A support cushion including a first underlying layer made from a flexible foam, at least one side of the first underlying layer being configured with a non-plane surface. The support cushion also includes a second underlying layer made from a flexible foam, at least one side of the second underlying layer being configured with a non-plane surface. The second underlying layer is placed in abutment with the first underlying layer. The support cushion further includes an overlying layer placed in abutment with the second underlying layer, the overlying layer being made from a visco-elastic foam.
1. A support cushion comprising:
a first underlying layer made from a flexible foam, at least one side of the first underlying layer being configured with a non-plane surface;
a second underlying layer made from a flexible foam, at least one side of the second underlying layer being configured with a non-plane surface, the second underlying layer being placed in abutment with the first underlying layer; and
an overlying layer placed in abutment with the second underlying layer, the overlying layer being made from a visco-elastic foam;
wherein the side of the first underlying layer configured with the non-plane surface is placed in abutment with a side of the second underlying layer configured with a plane surface.
2. The support cushion of claim 1 , wherein the non-plane surface of at least one of the first and second underlying layers includes truncated cones.
3. The support cushion of claim 2 , wherein the truncated cones have a height between about 15 mm and 30 mm.
4. The support cushion of claim 2 , wherein the truncated cones have tops, such that a mutual spacing between about 30 mm and 70 mm exists between the tops of the truncated cones.
5. The support cushion of claim 1 , wherein at least one of the first and second underlying layers includes at least one side having the non-plane surface configured in a continuous pattern.
6. The support cushion of claim 1 , wherein the second underlying layer is joined together with the first underlying layer by fusing a side of the second underlying with a side of the first underlying layer.
7. The support cushion of claim 1 , wherein the second underlying layer is joined together with the first underlying layer by gluing a side of the second underlying with a side of the first underlying layer.
8. The support cushion of claim 1 , wherein the overlying layer is placed in abutment with the side of the second underlying layer configured with the non-plane surface.
9. The support cushion of claim 1 , wherein the overlying layer is joined together with the second underlying layer by fusing a side of the overlying layer with a side of the second underlying layer.
10. The support cushion of claim 1 , wherein the overlying layer is joined together with the second underlying layer by gluing a side of the overlying layer with a side of the second underlying layer.
11. The support cushion of claim 1 , further comprising a top layer placed in abutment with the overlying layer, wherein the top layer is made from a visco-elastic foam.
12. The support cushion of claim 11 , wherein the top layer has a thickness between about 15 mm and 35 mm.
13. The support cushion of claim 11 , further comprising a total thickness of the first underlying layer, the second underlying layer, the overlying layer, and the top layer being between about 220 mm and 280 mm.
14. The support cushion of claim 13 , wherein the total thickness is between about 240 mm and 260 mm.
15. The support cushion of claim 11 , wherein the overlying layer and the top layer have substantially equal densities.
16. The support cushion of claim 11 , wherein the density of each of the top layer and the overlying layer is between about 50 kg/m 3 and 100 kg/m 3 .
17. The support cushion of claim 1 , wherein the overlying layer has a hardness between about 60 N and 100 N.
18. The support cushion of claim 1 , wherein the first and second underlying layers are made from a highly elastic polyurethane foam material.
19. The support cushion of claim 1 , wherein at least one of the first and second underlying layers has a thickness between about 50 mm and 150 mm.
20. The support cushion of claim 19 , wherein the thickness of at least one of the first and second underlying layers is between about 110 mm and 120 mm.
21. The support cushion of claim 19 , wherein the thickness of at least one of the first and second underlying layers is between about 70 mm and 80 mm.
22. The support cushion of claim 1 , wherein the overlying layer has a thickness between about 50 mm and 90 mm.
23. The support cushion of claim 22 , wherein the thickness of the overlying layer is between about 65 mm and 75 mm.
24. The support cushion of claim 16 , wherein the density of each of the top layer and the overlying layer is between about 80 kg/m 3 and 90 kg/m 3 .
25. The support cushion of claim 11 , wherein the overlying layer has a higher hardness than the top layer.
26. A support cushion comprising:
a first underlying layer made from a flexible foam, at least one side of the first underlying layer being configured with a non-plane surface;
a second underlying layer made from a flexible foam, at least one side of the second underlying layer being configured with a non-plane surface, the second underlying layer being placed in abutment with the first underlying layer; and
an overlying layer placed in abutment with the second underlying layer, the overlying layer being made from a visco-elastic foam;
wherein the non-plane surface of at least one of the first and second underlying layers includes truncated cones.
27. The support cushion of claim 26 , wherein the truncated cones have a height between about 15 mm and 30 mm.
28. The support cushion of claim 26 , wherein the truncated cones have tops, such that a mutual spacing between about 30 mm and 70 mm exists between the tops of the truncated cones.
29. A support cushion comprising:
a first underlying layer made from a flexible foam, at least one side of the first underlying layer being configured with a non-plane surface;
a second underlying layer made from a flexible foam, at least one side of the second underlying layer being configured with a non-plane surface, the second underlying layer being placed in abutment with the first underlying layer;
an overlying layer placed in abutment with the second underlying layer, the overlying layer being made from a visco-elastic foam; and
a top layer placed in abutment with the overlying layer, wherein the top layer is made from a visco-elastic foam.
30. The support cushion of claim 29 , wherein the top layer has a thickness between about 15 mm and 35 mm.
31. The support cushion of claim 29 , further comprising a total thickness of the first underlying layer, the second underlying layer, the overlying layer, and the top layer being between about 220 mm and 280 mm.
32. The support cushion of claim 31 , wherein the total thickness is between about 240 mm and 260 mm.
33. The support cushion of claim 29 , wherein the overlying layer and the top layer have substantially equal densities.
34. The support cushion of claim 29 , wherein the density of each of the top layer and the overlying layer is between about 50 kg/m 3 and 100 kg/m 3 .
35. The support cushion of claim 34 , wherein the density of each of the top layer and the overlying layer is between about 80 kg/m 3 and 90 kg/m 3 .
36. The support cushion of claim 29 , wherein the overlying layer has a higher hardness than the top layer.