End closure with anti-rotation tab
An end closure for a container providing a tab with increased resistance to rotation upon a rivet is disclosed. The end closure has a central panel wall having a product side, a public side, a rivet, and a displaceable tear panel in the central panel wall at least substantially defined by a frangible score and a non-frangible hinge segment. A tab is attached to the public side of the central panel wall by the rivet. At least a nose portion of the tab extends over a portion of the tear panel. A lift end of the tab is opposite the tab nose. The tab has a central webbing between the nose and the lift end. The central webbing has an anti-rotation member in communication with the public side of the central panel wall. The anti-rotation member provides a spring force against the central panel wall.
1. An end closure for a container including a central panel wall having a product side, a public side, a rivet, and a displaceable tear panel in said central panel wall at least substantially defined by a frangible score and a non-frangible hinge segment, comprising:
a tab being attached to the public side of the central panel wall by the rivet, at least a nose portion of said tab extending over a portion of the tear panel, a lift end of said tab being opposite said tab nose;
a central webbing of said tab between said nose and said lift end, said central webbing having a downwardly extending anti-rotation member in communication with the public side of the central panel wall; and
a spring force provided by said anti-rotation member against the central panel wall for increasing a torque required to rotate said tab, the spring force caused by an upward deflection of a portion of the central webbing caused by communication of the anti-rotation member with the central panel.
2. The end closure of claim 1 wherein said central webbing of said tab further comprises a rivet island surrounding said rivet and a void region to provide an exposed area of the central panel partially surrounding said rivet island, said void region defined by a void region perimeter of said central webbing, said anti-rotation member being located along a portion of said void region perimeter.
3. The end closure of claim 2 wherein said anti-rotation member is a portion of said rivet island.
4. The end closure of claim 2 wherein said portion of said void region perimeter having said anti-rotation member is spaced from said rivet island.
5. The end closure of claim 2 wherein said void region is a curvilinear opening partially surrounding the rivet at a generally equal distance from the rivet, and said anti-rotation member has a linear edge portion in communication with the central panel wall.
6. The end closure of claim 1 wherein said tab further comprises an opening defined by a void region perimeter of said central webbing and surrounding a rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said anti-rotation member being located along a portion of said void region perimeter located opposite said rivet island.
7. The end closure of claim 1 wherein said tab further comprises a U-shaped opening defined by a void region perimeter of said central webbing and surrounding a rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said anti-rotation member located on said rivet island along a portion of said void region perimeter.
8. The end closure of claim 1 wherein said tab further comprises an arch-shaped opening defined by a void region perimeter of said central webbing and surrounding a rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said anti-rotation member located on said rivet island along a portion of said void region perimeter.
9. The end closure of claim 8 wherein said anti-rotation member has a linear edge portion in communication with the central panel wall.
10. The end closure of claim 1 further comprising a detent, said detent located on the public side of the central panel wall in alignment with said anti-rotation member wherein said anti-rotation member is received within said detent.
11. The end closure of claim 10 wherein said central webbing of said tab further comprises a rivet island surrounding said rivet and a void region to provide an exposed area of the central panel partially surrounding said rivet island, said void region defined by a void region perimeter of said central webbing, said anti-rotation member being located along said void region perimeter.
12. The end closure of claim 11 wherein said anti-rotation member is a portion of said rivet island.
13. The end closure of claim 11 wherein said portion of said void region perimeter having said anti-rotation member is spaced from said rivet island.
14. The end closure of claim 11 wherein said void region is a curvilinear opening partially surrounding the rivet at a generally equal distance from the rivet, and said anti-rotation member has a linear edge portion in communication with the central panel wall.
15. The end closure of claim 10 wherein said tab further comprises an opening defined by a void region perimeter of said central webbing and surrounding said rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said downwardly extending portion is located along a portion of said void region perimeter located opposite said hinge connection.
16. The end closure of claim 10 wherein said tab further comprises a U-shaped opening defined by a void region perimeter of said central webbing and surrounding said rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said downwardly extending portion located on said rivet island along a portion of said void region perimeter.
17. The end closure of claim 10 wherein said tab further comprises an arch-shaped opening defined by a void region perimeter of said central webbing and surrounding said rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said downwardly extending portion located on said rivet island along a portion of said void region perimeter.
18. The end closure of claim 17 wherein said anti-rotation member has a linear edge portion in communication with the central panel wall.
19. An end closure for a container including a central panel wall having a product side, a public side, a rivet, and a displaceable tear panel in said central panel wall at least substantially defined by a frangible score and a non-frangible hinge segment, comprising:
a tab being attached to the public side of the central panel wall by the rivet, at least a nose portion of said tab extending over a portion of the tear panel, a lift end of said tab being opposite said tab nose;
a central webbing of said tab between said nose and said lift end, said central webbing having an anti-rotation member extending downwardly relative to the public side of the central panel wall, said anti-rotation member having a linear edge portion in communication with the central panel wall.
20. The end closure of claim 19 further comprising a spring force provided by said anti-rotation member against the central panel wall.
21. The end closure of claim 19 wherein said central webbing of said tab further comprises a rivet island surrounding said rivet and a void region to provide an exposed area of the central panel partially surrounding said rivet island, said void region defined by a void region perimeter of said central webbing, said anti-rotation member being located along a portion of said void region perimeter.
22. The end closure of claim 21 wherein said anti-rotation member is a portion of said rivet island.
23. The end closure of claim 21 wherein said portion of said void region perimeter having said anti-rotation member is spaced from said rivet island.
24. The end closure of claim 19 a detent formed on the public side of the central panel, said detent in alignment with said anti-rotation member wherein said anti-rotation member is received within said detent wherein a torque required to rotate said tab is increased.
25. The end closure of claim 19 wherein said tab further comprises an opening defined by a void region perimeter of said central webbing and surrounding a rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said anti-rotation member being located along a portion of said void region perimeter located opposite said rivet island.
26. The end closure of claim 19 wherein said tab further comprises a U-shaped opening defined by a void region perimeter of said central webbing and surrounding a rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said anti-rotation member located on said rivet island along a portion of said void region perimeter.
27. The end closure of claim 19 wherein said tab further comprises an arch-shaped opening defined by a void region perimeter of said central webbing and surrounding a rivet island, said rivet island being attached to a portion of said central webbing by a hinge connection, and said anti-rotation member located on said rivet island along a portion of said void region perimeter.