Drain design for use in a polyurethane composite bathing vessel

1. A bathing vessel, said bathing vessel comprising:

a bottom,

a side wall,

a drain disposed in said bottom adjacent a blended area, said blended area disposed between said side wall and said bottom,

wherein said side wall, said blended area and said bottom wall are constructed of a sandwich having

a first layer of rigid polyurethane material,

a second layer of capping material attached to said first layer,

wherein a ratio of a density of said polyurethane backing adjacent said drain to a thickness of polyurethane backing is between 1-80:1 and wherein said side wall, said blended area and said bottom wall flex to absorb loads adjacent said drain.

2. The bathing vessel of claim 1 wherein said blended area further comprises:

a first curve transitioning from said bottom into a second curve wherein said curve spaces said blended area outwardly to blend said blended area into said side wall.

3. The bathing vessel of claim 2 wherein said first curve has a radius that is less than a radius of said second curve.

4. The bathing vessel of claim 2 wherein a ratio between a radius of said first curve and a radius of said second curve is between 30-10:1.

5. The bathing vessel of claim 4 wherein said ratio is 16.3:1.

6. The bathing vessel of claim 2 wherein a third curve connects said second curve to said side wall.

7. The bathing vessel of claim 6 wherein said third curve has a radius that is less than a radius of said second curve.

8. The bathing vessel of claim 1 wherein said blended area is curved.

9. The bathing vessel of claim 8 wherein said curved blended area has a first curve attaching to said bottom, a second curve attaching to said first curve and a third curve attaching to said second curve and to said side wall wherein each of said three curves have different radii than the other curves.

10. The bathing vessel of claim 1 wherein said capping layer has an overall thickness around said drain between 0.01 inches and 0.3 inches.

11. The bathing vessel of claim 10 wherein said capping layer comprises a PMMA layer and an ABS layer.

12. The bathing vessel of claim 11 wherein a ratio between a thickness of said PMMA layer and said ABS layer is from 0.01-1:1.

13. The bathing vessel of claim 1 wherein said drain has a teardrop shape.

14. The bathing vessel of claim 13 wherein said drain has in inner contour that descends at an angle of about 10°.

15. A bathing vessel, said bathing vessel comprising:

a bottom,

a side wall,

a drain disposed in said bottom adjacent a blended area, said blended area disposed between said side wall and said bottom,

wherein said side wall, said blended area and said bottom wall are constructed of a sandwich having

a first layer of rigid polyurethane material,

a second layer of capping material attached to said first layer, and

wherein said blended area has a first curve extending upwardly towards said side wall, a second curve extending upwardly from and attaching to said first curve and a third curve extending upwardly from and attaching to said second curve and attaching to said side wall.

16. The bathing vessel of claim 15 wherein said first curve has a radius of between 0.4-0.5.

17. The bathing vessel of claim 15 wherein said second curve has a radius of between 4-6.

18. The bathing vessel of claim 15 wherein said third curve has a radius of between 0.2 and 0.4.

19. The bathing vessel of claim 15 wherein a ratio between a radius of said first curve and a radius of said second curve is between 0.67-.0.12:1.

20. The bathing vessel of claim 15 wherein a ratio between a radius of said first curve and a radius of said third curve is between 2.5-1:1.

21. The bathing vessel of claim 15 wherein a ratio between a radius of said second curve and a radius of said third curve is between 10-30:1.