Method of forming an opening tab in sheet metal container end cl

Details Method of forming an opening tab in sheet metal container end cl Method of forming an opening tab in sheet metal container end cl

1975-11-03

1977-07-05

Larson, Lowell A.

113 1F, B21D 5140

Patent

active

040332756

ABSTRACT:
A bulge, formed in and cut from an end closure central panel, is reformed into an opening tab by reducing the bulge height and its sidewall angle to extend its brim horizontally outward under the rim of the opening from which the bulge is cut, and the brim is coined to further extend it under the rim. Alternatively, an outwardly extending shoulder can be formed in the bulge sidewall, and ironed out to cooperate with the reduction in bulge height in extending the bulge brim outward under the rim. During reforming and coining, the bulge/opening tab is held in a substantially horizontally fixed position relative to the rim to provide a uniform brim-to-rim underlap.

REFERENCES:
patent: 2261117 (1941-11-01), Jack
patent: 3888199 (1975-06-01), Herrmann
patent: 3931909 (1976-01-01), Dalli et al.
patent: 3948415 (1976-04-01), Debenham

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