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US 6,761,280 B2Granted
Metal end shell and easy opening can end for beer and beverage cans
AssigneeAlcon Inc.
InventorsHarry R. Zonker, Gary L. Myers, Robert E. Dick, Darl G. Boysel, John S. Ward
Life of this patent
Estimating the term…
Abstract
A sheet metal end shell for conversion into easy opening beer and beverage ends with reduced metal usage while maintaining commercially acceptable buckle resistance. The end shell has an upper chuckwall portion that is disposed at an angle of about 20-35 degrees to vertical, a countersink bead having a width of about 0.020-0.040 inch, and further preferably having a countersink depth of less than about 0.250 inch and a panel depth less than about 0.070 inch.
Claims34
An end shell for a container of contents under pressure comprising:
- a substantially flat central panel portion;
- a panel radius extending downwardly from the periphery of said central panel portion;
- an annular countersink bead around said central panel portion including an annular panel wall extending downwardly from said panel radius around the periphery of said central panel portion, an upwardly open arcuate bottom wall having a width of about 0.020-0.040 inch as measured on the public surface of said end shell, and an upwardly projecting lower chuckwall portion;
- an annular upper chuckwall extending upwardly and outwardly from said lower chuckwall portion with a chuckwall bend between said upper and lower chuckwall portions;
- and
- a peripheral curved flange projecting outwardly from the top of said upper chuckwall for double seaming the end shell on a container body;
- wherein said lower chuckwall portion is substantially vertical, said upper chuckwall portion is disposed at an angle of about 20-35° to vertical, and a center of a radius of curvature of said chuckwall bend between said lower chuckwall portion and said upper chuckwall portion is within about 0.010 inch of a plane through the line of tangency of a straight portion of said central panel portion with said panel radius on the product side of said end shell, and said end shell has a countersink depth measured from the top of said peripheral curved flange to the upper surface of said arcuate bottom wall of said countersink bead at the bottom of the bead that is less than 0.250 inch.
4 more elements
An end shell having a 202 diameter for a container of contents under pressure comprising:
- a substantially flat central panel portion;
- a panel radius extending downwardly from the periphery of said central panel portion;
- an annular countersink bead around said central panel portion including an annular panel wall extending downwardly from said panel radius around the periphery of said central panel portion, an upwardly open arcuate bottom wall having a width in a range of about 0.020-0.040 inch as measured on the public surface of said end shell, and a lower chuckwall portion projecting upwardly from an outer edge of said arcuate bottom wall;
- an annular upper chuckwall extending upwardly and outwardly from said lower chuckwall portion, with a chuckwall bend between said upper and lower chuckwall portions;
- and
- a peripheral curved flange projecting outwardly from the top of said upper chuckwall for double seaming the end shell on a container body;
- wherein said end shell has been formed from a disc of aluminum having a cut edge diameter less than 2.760 inches, said central panel portion has a diameter of about 1.847 inches said lower chuckwall portion is substantially vertical, said upper chuckwall portion is disposed at an angle of about 20-35 degrees to vertical, and a center of a radius of curvature of said chuckwall bend between said lower chuckwall portion and said upper chuckwall portion is within about 0.010 inch of a plane through the line of tangency of said central panel portion with said panel radius on the product side of said end shell, and said end shell has a countersink depth measured from the top of said peripheral curved flange to the upper surface of said arcuate bottom wall of said countersink bead at the bottom of the bead that is less than 0.250 inch.
4 more elements
An easy opening can end having a 202 diameter comprising:
- a substantially flat central panel portion;
- a pull tab attached to a portion of said central panel portion that is at least partially removable therefrom;
- a panel radius extending downwardly from the periphery of said central panel portion;
- an annular countersink bead around said central panel portion including an annular panel wall extending downwardly from said panel radius around the periphery of said central panel portion, an upwardly open arcuate bottom wall having a width of about 0.020-0.040 inch as measured on the public surface of said end shell, and an upwardly projecting lower chuckwall portion;
- an annular upper chuckwall extending upwardly and outwardly from said lower chuckwall portion;
- and
- a peripheral curved flange projecting outwardly from the top of said upper chuckwall for double seaming the end shell on a container body;
- wherein said easy opening can end has been formed from a disc of aluminum having a cut edge diameter less than 2.760 inches, said central panel has a diameter of about 1.847 inches, said lower chuckwall portion is substantially vertical, said upper chuckwall portion is disposed at an angle of about 20-35° to vertical, and a center of a radius of curvature of said chuckwall bend between said lower chuckwall portion and said upper chuckwall portion is within 0.010 inch of a plane through the line of tangency of a straight portion of said central panel portion with said panel radius on the product side of said end shell, and said end shell has a countersink depth measured from the top of said peripheral curved flange to the upper surface of said arcuate bottom wall of said countersink head as the bottom of the head that is less than 0.250 inch.
5 more elements
Dependencies are inferred from the claim text.