Method of forming a drum or pail closure

Details Method of forming a drum or pail closure Method of forming a drum or pail closure

1986-08-06

1990-07-03

Bray, W. Donald

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72367, 220 5R, 220 74, 220319, 413 6, 413 31, B21D 2200

Patent

active

049380516

ABSTRACT:
The formation of an outwardly extending curl as the upper rim of a pail or drum having a cylindrical wall by curling the peripheral edge through greater than 360.degree. relative to the cylindrical wall forms a strong curl able to support, with the aid of a gasket, a leak proof seal during dangerous goods testing. When used with a lug-cover lid, the lugs may be clenched beneath the curl through a re-entrant portion enhancing the security of the seal. Methods of forming the curl in a two-storage operation by forming primary and then secondary curl components, and an improved lug configuration are also described.

REFERENCES:
patent: 1574764 (1926-03-01), Tevander
patent: 2275220 (1942-03-01), Enkur
patent: 3448891 (1969-06-01), Czarnecki
patent: 4392295 (1983-07-01), Sasai et al.
patent: 4651892 (1987-03-01), Boersma

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