Container having a bottom provided with a vault with a double indentation

1. A container ( 1 ) of plastic material, provided with a body ( 5 ) and with a bottom ( 6 ) extending from a lower end of the body ( 5 ), the bottom ( 6 ) comprising:

a peripheral footing ( 7 ) that defines a contact plane ( 8 ) having an outer diameter (D);

a concave vault ( 10 ) that extends from a central area ( 11 ) to the peripheral footing ( 7 ); and

a series of main reinforcing grooves ( 13 ) that extend radially from the central area ( 11 ) to at least the peripheral footing ( 7 ),

wherein the vault ( 10 ) has three concentric regions, namely a central region ( 15 ), a middle region ( 16 ), and a peripheral region ( 17 ), separated respectively by an inner axial step ( 18 ) and an outer axial step ( 19 ) that extend annularly in a continuous manner around the central area ( 11 ), ensuring that the central region ( 15 ) is raised relative to the middle region ( 16 ), and the middle region ( 16 ) is raised relative to the peripheral region ( 17 ),

wherein, a cross-section of each of the central region ( 15 ), the middle region ( 16 ), and the peripheral region ( 17 ) has a non-zero radius of curvature, and

wherein both an external surface of an internal surface of said inner axial step ( 18 ) and step outer axial step ( 19 ) is stepped with i) the inner axial step ( 18 ) being comprised of a first outside vertical step surface and an opposite first inside vertical step surface of a first height (H 1 ), and ii) the outer axial step ( 19 ) being comprised of a second outside vertical step surface and an opposite second inside vertical step surface (H 2 ) of a second height, the inner and outer steps ( 18 , 19 ) opposing an inversion of the bottom ( 6 ) by causing a stiffening of the vault ( 10 ) in the middle region ( 16 ), and by limiting a deformation of the vault ( 10 ) so as to expand the footing ( 7 ) toward a center of the bottom ( 6 ).

2. The container ( 1 ) according to claim 1 , wherein each of the first height (H 1 ) and the second height (H 2 ) is less than 4% of the outer diameter (D) of the contact plane ( 8 ).

3. The container according to claim 2 , wherein each of the first height (H 1 ) and the second height (H 2 ) is about 3% of the outer diameter (D) of the contact plane ( 8 ).

4. The container according to claim 3 , wherein the inner step ( 18 ) has a diameter (D 1 ) of between 30% and 40% of the outer diameter (D) of the contact plane ( 8 ).

5. The container according to claim 3 , wherein the outer step ( 19 ) has a diameter (D 2 ) of between 50% and 60% of the outer diameter (D) of the contact plane ( 8 ).

6. The container according to claim 2 , wherein the inner step ( 18 ) has a diameter (D 1 ) of between 30% and 40% of the outer diameter (D) of the contact plane ( 8 ).

7. The container according to claim 2 , wherein the outer step ( 19 ) has a diameter (D 2 ) of between 50% and 60% of the outer diameter (D) of the contact plane ( 8 ).

8. The container ( 1 ) according to claim 1 , wherein each of the first height (H 1 ) and the second height (H 2 ) is about 1 mm.

9. The container according to claim 8 , wherein the inner step ( 18 ) has a diameter (D 1 ) of between 30% and 40% of the outer diameter (D) of the contact plane ( 8 ).

10. The container according to claim 8 , wherein the outer step ( 19 ) has a diameter (D 2 ) of between 50% and 60% of the outer diameter (D) of the contact plane ( 8 ).

11. The container according to claim 1 , wherein the inner step ( 18 ) has a diameter (D 1 ) of between 30% and 40% of the outer diameter (D) of the contact plane ( 8 ).

12. The container ( 1 ) according to claim 11 , wherein the diameter of the inner step ( 18 ) is about 37% of the outer diameter (D) of the contact plane ( 8 ).

13. The container according to claim 1 , wherein the outer step ( 19 ) has a diameter (D 2 ) of between 50% and 60% of the outer diameter (D) of the contact plane ( 8 ).

14. The container ( 1 ) according to claim 13 , wherein the diameter of the outer step ( 19 ) is about 54% of the diameter of the contact plane ( 8 ).

15. The container ( 1 ) according to claim 1 , wherein the main reinforcing grooves ( 13 ) extend radially beyond the footing ( 7 ).

16. The container ( 1 ) according to claim 1 , wherein the bottom ( 6 ) comprises a series of interposed reinforcing grooves ( 14 ), which extend locally straddling the footing ( 7 ).

17. The container according to claim 1 , wherein,

each of the central region ( 15 ), the middle region ( 16 ), and the peripheral region ( 17 ) are sloped upward from the footing ( 7 ) towards the central area ( 11 ) by an outside surface and an opposite inside surface that are sloped upward from the footing ( 7 ) towards the central area ( 11 ),

and

the inner axial step ( 18 ) vertically raises an outer sloped end of the central region ( 15 ) relative to an inner sloped end of the middle region ( 16 ) by the first height, and the outer axial step ( 19 ) vertically raises an outer sloped end of the middle region ( 16 ) relative to an inner sloped end of the peripheral region ( 17 ) by the second height.

18. The container ( 1 ) according to claim 17 , wherein,

each of the first height (H 1 ) and the second height (H 2 ) is about 1 mm, and

the radius of curvature of the central region ( 15 ), the middle region ( 16 ), and the peripheral region ( 17 ) are approximately identical.

19. The container ( 1 ) according to claim 1 , wherein,

the radius of curvature of the central region ( 15 ), the middle region ( 16 ), and the peripheral region ( 17 ) are approximately identical.

20. A container ( 1 ) of plastic material, comprising:

a body ( 5 ); and

a bottom ( 6 ),

the bottom ( 6 ) comprising

i) a peripheral footing ( 7 ) that extends into a lower end of the body ( 5 ), the footing ( 7 ) ending in a contact plane ( 8 ) that defines a lower end of the container ( 1 ) and allows the container ( 1 ) to be placed, upright, on a plane surface, the contact plane ( 8 ) having an outer diameter (D);

ii) a concave vault ( 10 ) that extends from the peripheral footing ( 7 ) to a central area ( 11 ) of the bottom ( 6 ) located around a button ( 12 ); and

iii) a series of main reinforcing grooves ( 13 ) that extend radially from the central area ( 11 ) to at least the footing ( 7 ),

wherein the vault ( 10 ) comprises a central region ( 15 ), a middle region ( 16 ), and a peripheral region ( 17 ),

wherein, a cross-section of each of the central region ( 15 ), the middle region ( 16 ), and the peripheral region ( 17 ) has a non-zero radius of curvature, each of the central region ( 15 ), the middle region ( 16 ), and the peripheral region ( 17 ) having an outside surface and an opposite inside surface that are slope upward from the footing ( 7 ) towards the button ( 12 ), an inner axial step ( 18 ) separating the central region ( 15 ) and the middle region ( 16 ), and an outer axial step ( 19 ) separating the middle region ( 16 ) and the peripheral region ( 17 ), the inner axial step ( 18 ) being comprised of a first annular outside vertical step surface and an opposite first annular inside vertical step surface of a first height, the outer axial step ( 19 ) being comprised of a second annular outside vertical step surface and an opposite second annular inside vertical step surface of a second height, the inner axial step ( 18 ) vertically raising an outer sloped end of the central region ( 15 ) to be vertically aligned with an inner sloped end of the middle region ( 16 ) by the first height, and the outer axial step ( 19 ) vertically raising an outer sloped end of the middle region ( 16 ) to be vertically aligned with an inner sloped end of the peripheral region ( 17 ) by the second height, the inner and outer steps ( 18 , 19 ) opposing an inversion of the bottom ( 6 ) by causing a stiffening of the vault ( 10 ) in the middle region ( 16 ), and by limiting a deformation of the vault ( 10 ) so as to expand the footing ( 7 ) toward a center of the bottom ( 6 ).