Sheet metal container making – Method
Patent
1985-02-07
1985-12-24
Gilden, Leon
Sheet metal container making
Method
220 74, 413 69, B21D 5100
Patent
active
045603138
ABSTRACT:
A method of and apparatus for reforming an external curl on a tubular side wall of a container body by providing a first die having a groove to engage with the inside and outside of the curl to prevent lateral spreading of the curl and a second die having a convex surface enterable into the groove of the first die and a mechanism to cause relative motion in a direction parallel to the axis of the body as between the first and second dies to crush the curl, the groove of the first die being in engagement with an upper surface of the curl to prevent lateral spread of the curl, and the second die being applied to an underneath surface of the curl so that the later-noted relative motion between the first and second dies imposes a crushing force to create a reformed curl having a first annulus of arcuate cross section extending outwardly in a lateral direction from the side wall to define a convex external surface; a folded portion turning radially inward from the outer periphery of the first annulus, and a second annulus extending radially inwards from the folded portion so that a convex surface of the second annulus extends adjacent to a concave inner surface of the first annulus and a marginal edge portion of the second annulus extends between the convex surface of the second annulus and the concave surface of the first annulus.
REFERENCES:
patent: 1967256 (1934-07-01), Peters
patent: 2335647 (1943-11-01), Chamberlain
patent: 3757716 (1973-09-01), Gedde
Gilden Leon
Metal Box p.l.c.
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