Can bottom having improved strength and apparatus for making sam

Details Can bottom having improved strength and apparatus for making sam Can bottom having improved strength and apparatus for making sam

1999-06-03

2000-10-17

Pollard, Steven

Receptacles

End wall structure

Joint or seam between sidewall and end wall

220608, 220606, B65D 100

Patent

active

061317616

ABSTRACT:
A can bottom having an approximately frustoconical portion extending downwardly and inwardly from the can side wall, an annular nose portion extending downwardly from the approximately frustoconical portion, and a central portion extending upwardly and inwardly from the nose. The nose is formed by inner and outer circumferentially extending frustoconical walls that are joined by a downwardly convex arcuate portion. The inner surface of the arcuate portion of the nose has a radius of curvature adjacent the nose inner wall of at least 0.060 inch. The central portion of the can bottom has a substantially flat disc-shaped central section, having a diameter of at least about 1.40 inches, and an 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 of the arcuate portion of the nose is formed by a sector of a circle and has radius of curvature is no greater than about 0.070 inch. An apparatus for making the can bottom comprises a nose punch whose distal end has a radius of curvature that is equal to the radius of curvature of the can bottom nose and a die whose radius of curvature equals that of the dome.

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