Can bottom having improved strength and apparatus for making same

A can base having an approximately frustoconical portion (8) extending downwardly and inwardly from the can side wall (4), an annular nose portion (16) extending downwardly from the approximately frustoconical portion, and a central portion (24) extending upwardly and inwardly from the nose. The nos...

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Bibliographic Details
Main Authors F.A. JONES, G.-F. CHENG
Format Patent
LanguageEnglish
Published 29.08.2001
Edition7
Subjects
ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR
CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS
CONVEYING
HANDLING THIN OR FILAMENTARY MATERIAL
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
PACKAGES
PACKAGING ELEMENTS
PACKING
PERFORMING OPERATIONS
PUNCHING METAL
STORING
TRANSPORTING
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Summary:A can base having an approximately frustoconical portion (8) extending downwardly and inwardly from the can side wall (4), an annular nose portion (16) extending downwardly from the approximately frustoconical portion, and a central portion (24) extending upwardly and inwardly from the nose. The nose (16) is formed by inner and outer circumferentially extending frustoconical walls (12,13) that are joined by a downwardly convex arcuate portion (18). The inner surface (29) of the arcuate portion (18) of the nose (16) has a radius of curvature adjacent the nose inner wall (12) of at least 0.060 inch. The central portion (24) of the can base has a substantially flat disc-shaped central section (26), having a diameter of at least about 1.40 inches, and an annular portion (25) approximately dome-shaped and downwardly concave having a radius of curvature no greater than 1.475 inches. In a preferred embodiment of the invention, the inner surface (29) of the arcuate portion (18) of the nose (16) is formed by a sector of a circle and has radius of curvature no greater than about 0.070 inch. An apparatus for making the can base comprises a nose punch (52) whose distal end has a radius of curvature that is equal to the radius of curvature of the can base nose and a die whose radius of curvature equals that of the dome.
Bibliography:Application Number: CN19998009038