A closure cap for a container containing carbonated beverages has a head plate ( 2 ) and a substantially cylindrical cap skirt ( 4 ) extending from the edge ( 3 ) of the head plate ( 2 ). A cap thread ( 6 ) is provided on the inside ( 5 ) of the cap skirt ( 4 ). In the transition region ( 7 ) between the head plate ( 2 ) and the cap skirt ( 4 ) reinforcing ribs ( 8 ) are provided, which extend up to the head plate ( 2 ).
1. A closure cap ( 1 ) for a container containing a carbonated beverage comprising an end panel ( 2 ) joined at a radius portion ( 7 ) to a depending peripheral skirt ( 4 ); said end panel ( 2 ), radius portion ( 7 ) and depending peripheral skirt ( 4 ) each including an inner surface; said radius portion inner surface defining a transition surface between said end panel inner surface and an uppermost peripheral inner surface portion of said peripheral skirt inner surface; a cap thread ( 6 ) below said uppermost peripheral inner surface portion of said peripheral skirt inner surface for threading the closure cap ( 1 ) to an associated container mouth, a plurality of peripherally spaced substantially stiff reinforcing rib means ( 8 , 38 , 48 , 58 ) for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said plurality of reinforcing rib means ( 8 , 38 , 48 , 58 ) being a plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly from and beyond said uppermost peripheral skirt inner surface and terminating contiguous said cap thread, said cap thread ( 6 ) having a thread end portion located contiguous said uppermost peripheral inner surface portion, a plane through said thread end portion defining an imaginary screwing line (S), said plurality of reinforcing ribs each having a terminal end contiguous said imaginary screwing line (S), and at least some of said reinforcing ribs being of different axial lengths.
2. The closure cap as defined in claim 1 wherein said cap thread ( 6 ) has a thread end ( 10 ) located contiguous said uppermost peripheral inner surface portion, and said plurality of reinforcing ribs are located in a peripheral region ( 9 ) adjacent said thread end ( 10 ).
3. The closure cap as defined in claim 1 wherein said cap thread ( 6 ) has a thread end portion located contiguous said uppermost peripheral inner surface portion, a plane through said thread end portion defines an imaginary screwing line (S), and said plurality of reinforcing ribs each have a terminal end contiguous said imaginary screwing line (S).
4. The closure cap as defined in claim 1 wherein said cap thread ( 6 ) has a thread end portion located contiguous said uppermost peripheral inner surface portion, a plane through said thread end portion defines an imaginary screwing line (S), said plurality of reinforcing ribs each have a terminal end contiguous said imaginary screwing line (S), and at least one of said reinforcing ribs projects axially downwardly beyond said imaginary screwing line (S).
5. The closure cap as defined in claim 1 wherein said cap thread ( 6 ) has a thread end portion located contiguous said uppermost peripheral inner surface portion, a plane through said thread end portion defines an imaginary screwing line (S), said plurality of reinforcing ribs each have a terminal end contiguous said imaginary screwing line (S), and at least one of said reinforcing ribs projects axially downwardly to but not beyond said imaginary screwing line (S).
6. The closure cap as defined in claim 1 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion which extends over an angular section (α) of substantially 90°.
7. The closure cap as defined in claim 1 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, and said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion.
8. The closure cap as defined in claim 1 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion, and said another plurality of reinforcing ribs each have substantially the same axial length (l).
9. The closure cap as defined in claim 1 wherein said plurality of reinforcing ribs each project radially inwardly such that innermost faces ( 11 ) of said plurality of reinforcing ribs lie on an imaginary cylinder ( 2 ) corresponding substantially to an outer cylindrical surface of an associated container mouth.
10. The closure cap as defined in claim 2 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion which extends over an angular section (α) of substantially 90°.
11. The closure cap as defined in claim 2 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, and said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion.
12. The closure cap as defined in claim 3 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion which extends over an angular section (α) of substantially 90°.
13. The closure cap as defined in claim 3 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, and said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion.
14. The closure cap as defined in claim 4 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion which extends over an angular section (α) of substantially 90°.
15. The closure cap as defined in claim 4 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, and said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion.
16. The closure cap as defined in claim 5 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion which extends over an angular section (α) of substantially 90°.
17. The closure cap as defined in claim 5 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, and said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion.
18. The closure cap as defined in claim 1 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion which extends over an angular section (α) of substantially 90°.
19. The closure cap as defined in claim 1 wherein said plurality of reinforcing ribs are located in a peripheral region ( 9 ) of said uppermost peripheral inner surface portion, another plurality of peripherally spaced substantially stiff reinforcing rib means for stiffening said peripheral skirt ( 4 ) at said uppermost peripheral inner surface portion and said end panel ( 2 ) at said transition surface thereby preventing at least one of radial outward peripheral skirt bulging and spreading between the peripheral skirt and the end panel; said another plurality of rib means being another plurality of reinforcing ribs extending axially from said end panel inner surface along and projecting radially inwardly beyond said uppermost peripheral skirt inner surface and terminate contiguous said cap thread, and said another plurality of reinforcing ribs ( 18 ) and said first-mentioned plurality of reinforcing ribs ( 8 , 38 , 48 , 58 ) being located at different angular regions of said uppermost peripheral inner surface portion.