Manufacture of a frangible element in sheet material

Details Manufacture of a frangible element in sheet material Manufacture of a frangible element in sheet material

1974-09-20

1976-04-20

Lanham, C. W.

113 1F, 113 15A, B21D 5126

Patent

active

039510840

ABSTRACT:
A disclosure of making a frangible element or weakened line in metal sheet, especially tinplate, for use as a container end, an elongate frangible element of thinned metal is produced in the sheet, bounded on one side by a step in one surface and on the other side by a step in the other surface, the two steps as seen in section merging smoothly with concave curves into the respective surfaces of the frangible element. To take up excess metal from the thinning process, at least one hollow protuberance is formed in the sheet to one side of the frangible element. Press tool dies for performing the method are shown.

REFERENCES:
patent: 2071030 (1937-02-01), Fay
patent: 2112231 (1938-03-01), Speidel
patent: 3254790 (1966-06-01), Dunn
patent: 3303958 (1967-02-01), Taylor
patent: 3334777 (1967-08-01), Smyth
patent: 3362569 (1968-01-01), Geiger
patent: 3400852 (1968-09-01), Khoury
patent: 3411470 (1968-11-01), Fraze
patent: 3434623 (1969-03-01), Cookson
patent: 3500939 (1970-03-01), Bozek
patent: 3698590 (1972-10-01), Cookson

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