Claims
- 1. A method for strengthening an easy open can end member having a center panel positioned about a longitudinal axis perpendicular to a diameter of the center panel, the center panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the center panel once the easy open can end member is opened; a curl defining an outer perimeter of the end member; a circumferential chuck wall extending downwardly from the curl; and a transition wall joining the chuckwall to the center panel, comprising the step of:
coining at least a portion of a substantially planar peripheral edge of the central panel.
- 2. The method of claim 1 further comprising the step of forming a step portion along the peripheral edge of the center panel, the step portion having an annular convex portion joined to an annular concave portion and displacing at least a portion of the center panel vertically in a direction parallel to the longitudinal axis.
- 3. The method of claim 2 wherein the step portion displaces the center panel upwardly.
- 4. The method of claim 2 wherein the step portion displaces the center panel downwardly.
- 5. The method of claim 2 wherein the step portion is located radially inwardly from the coined portion of the peripheral edge of the center panel.
- 6. The method of claim 2 wherein the annular concave portion is the radially innermost portion of the step portion.
- 7. The method of claim 2 wherein the annular convex portion is the radially innermost portion of the step portion.
- 8. The method of claim 2 wherein at least a portion of the annular convex portion is coined.
- 9. The method of claim 2 wherein at least a portion of the annular concave portion is coined.
- 10. The method of claim 1 further comprising the step of forming a fold portion in the transition wall connecting the chuck wall with a peripheral edge of the center panel.
- 11. An easy open can end member comprising:
a center panel positioned about a longitudinal axis perpendicular to a diameter of the center panel, the center panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the center panel once the easy open can end member is opened, the center panel having a peripheral edge, at least a portion of the peripheral edge including a coined segment; a curl defining an outer perimeter of the end member; a circumferential chuck wall extending downwardly from the curl; and a transition wall connecting the chuck wall with a peripheral edge of the center panel, the transition wall comprising a folded portion.
- 12. The easy open can end member of claim 11 further comprising a step portion located on the center panel and radially outwardly from the longitudinal axis, the step portion having an annular convex portion joined to an annular concave portion and displacing at least a portion of the center panel vertically in a direction parallel to the longitudinal axis.
- 13. The easy open can end member of claim 12 wherein the step portion displaces the center panel upwardly.
- 14. The easy open can end member of claim 12 wherein the step portion displaces the center panel downwardly.
- 15. The easy open can end member of claim 12 wherein the step portion is located radially inwardly from the coined segment of the peripheral edge of the center panel.
- 16. The easy open can end member of claim 12 wherein the annular concave portion is the radially innermost portion of the step portion.
- 17. The easy open can end member of claim 12 wherein the annular convex portion is the radially innermost portion of the step portion.
- 18. The easy open can end member of claim 12 wherein the coin segment includes at least a portion of the annular convex portion.
- 19. The easy open can end member of claim 12 wherein the coin segment includes at least a portion of the annular concave portion.
- 20. The easy open can end member of claim 11 wherein the closure member comprises a tear panel defined by fracturable score, the tear panel retained to the central panel along a non-scored hinge region.
- 21. The easy open can end member of claim 11 wherein the central panel further comprises an aperture defined by a flange, and the closure member comprises a flexible metal foil peelably bonded to a portion of the flange.
- 22. A method for strengthening an easy open can end member having a center panel positioned about a longitudinal axis perpendicular to a diameter of the center panel, the center panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the center panel once the easy open can end member is opened; a curl defining an outer perimeter of the end member; a circumferential chuck wall extending downwardly from the curl, comprising in sequence the steps of:
forming a transition wall connecting the chuck wall with a peripheral edge of the center panel, the transition wall comprising a folded portion; and coining at least a portion of a peripheral edge of the central panel.
- 23. The method of claim 22 further comprising the step of forming a step portion along the peripheral edge of the center panel, the step portion having an annular convex portion joined to an annular concave portion and displacing at least a portion of the center panel vertically in a direction parallel to the longitudinal axis wherein the forming a step portion step is performed after the coining step.
RELATED APPLICATION
[0001] This application is a divisional application of co-pending application Ser. No. 10/680,644 filed on Oct. 7, 2003 which was a continuation-in-part of application Ser. No. 10/219,914 filed on Aug. 15, 2002 which was a continuation-in-part of co-pending application Ser. No. 09/931,497 which was filed on Aug. 16, 2001. The applications are commonly assigned and incorporated by reference herein.
Divisions (1)
|
Number |
Date |
Country |
Parent |
10680644 |
Oct 2003 |
US |
Child |
10847172 |
May 2004 |
US |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
10219914 |
Aug 2002 |
US |
Child |
10680644 |
Oct 2003 |
US |
Parent |
09931497 |
Aug 2001 |
US |
Child |
10219914 |
Aug 2002 |
US |