Wooden spring and mattress manufactured with wooden springs

1. A mattress including a wooden coil spring made of a slat of wood having, at a first point of the slat, a cross section with rectilinear major sides with a first value as a first dimension, and having, at a second point remote in the longitudinal direction of the slat from the first point, a cross section with rectilinear major sides with a second value as the first dimension, the first value being greater than the second value,

wherein the coil spring is made of non-compressed wood.

2. The mattress of claim 1 , wherein the coil spring has a cylindrical shape.

3. The mattress of claim 1 , wherein the coil spring has a cone or truncated cone shape.

4. The mattress of claim 3 , wherein the coil spring comprises at least three turns, each turn having a diameter smaller than an immediately adjacent turn.

5. The mattress of claim 1 , wherein the coil spring has a longitudinal axis extending through a center of the coil spring, and

an outer surface of the end turn facing away from any adjacent turn of the coil spring is substantially perpendicular, for at least 180 degrees of the end turn, to the longitudinal axis of the coil spring.

6. The mattress of claim 1 , wherein the coil spring has a helical rise in a range of 3-45 degrees.

7. The mattress of claim 1 , wherein the wooden coil springs comprise a wooden coil spring having an end turn with a smaller width than remaining turns of the wooden coil spring.

8. The mattress of claim 1 , wherein the first dimension of the slat is measured radially with respect to the longitudinal axis of the coil spring.

9. The mattress of claim 1 , wherein the first dimension of the slat is measured axially with respect to the longitudinal axis of the coil spring.

10. The mattress of claim 1 , wherein the second point comprises a wood removed portion so as to create the second value of the first dimension.

11. The mattress of claim 1 , wherein the first point comprises turns of the coil spring attached to each other so as to create the first value of the first dimension.

12. The mattress of claim 1 , wherein the slat is made of at least one of beech wood, oak wood, cherry wood, or walnut wood.

13. The mattress of claim 1 , wherein the slat is made of a nut tree wood.

14. A mattress including a wooden coil spring made of a slat of wood having, at a first point of the slat, a cross section with rectilinear major sides with a first value as a first dimension, and having, at a second point remote in the longitudinal direction of the slat from the first point, a cross section with rectilinear major sides with a second value as the first dimension, the first value being greater the second value, wherein the mattress further comprises:

a first plurality of wooden coil springs positioned in a first area of the mattress and a second plurality of wooden coil springs positioned in a second area of the mattress different from the first area,

wherein the first plurality of wooden coil springs provides a firmness firmer than the second plurality of wooden coil springs,

wherein the coil spring is made of non-compressed wood.

15. The mattress of claim 14 , wherein each coil spring of the first plurality of wooden coil springs comprises:

(1) an end turn wider than end turns of the coil springs of the second plurality of wooden coil springs, and

(2) remaining turns having substantially the same widths as the remaining turns of the second plurality of wooden coil springs.

16. The mattress of claim 14 , wherein the first plurality of wooden coil springs comprises coil springs each with a course of compression shorter than the course of compression of each of the coil springs of the second plurality of wooden coil springs.

17. The mattress of claim 14 , wherein the first plurality of wooden coil springs comprises coil springs shorter than coil springs of the second plurality of wooden coil springs.

18. A mattress including a wooden coil spring made of a slat of wood having, at a first point of the slat, a cross section with rectilinear major sides with a first value as a first dimension, and having, at a second point remote in the longitudinal direction of the slat from the first point, a cross section with rectilinear major sides with a second value as the first dimension, the first value being greater the second value,

wherein the coil spring has a cylindrical shape, and

wherein the wooden coil spring comprises:

(1) an end turn wider than an end turn of a second coil spring in the mattress, and

(2) remaining turns having substantially the same widths as the remaining turns of the second wooden coil spring,

wherein the coil spring is made of non-compressed wood.