Reinforced can end

Details Reinforced can end Reinforced can end

1985-12-09

1986-08-19

Pollard, Steven M.

Receptacles

Receptacle side wall made of two or more layers of material...

Beverage receptacle

220 67, B65D 808

Patent

active

046064729

ABSTRACT:
The invention herein relates to a method of and apparatus forming a reinforced pressure resistant can end by gripping a central panel of a metallic blank between an axially aligned reform pad and an indent ring, the reform pad being in internal concentric relationship to a draw punch and the indent ring being in internal concentric relationship to a lift ring, the draw punch being movable in a first direction to exert first forces against a peripheral edge portion of the blank in a first direction to form the peripheral edge portion out of the plane of the central panel and shape the blank into a generally flanged cup-shaped configuration defined by the central panel, a radius, a frusto-conical wall and an annular flange, and while the central panel is still gripped, second forces are exerted beyond the first forces and in a second direction opposite the first direction to form at least at least a part of the metal of the radius, in the absence of restraint or constraint, out of the plane of the central panel and to a side thereof opposite the flange to form an annular reinforcing countersink radius.

REFERENCES:
patent: 3441170 (1969-04-01), Khoury
patent: 3843014 (1974-10-01), Cospen et al.
patent: 4093102 (1978-06-01), Kraska
patent: 4177746 (1979-12-01), Lee, Jr. et al.
patent: 4294373 (1981-10-01), Miller et al.
patent: 4431112 (1984-02-01), Yamaguchi
patent: 4448322 (1984-05-01), Kraska
patent: 4467933 (1984-08-01), Wilkinson et al.

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