Method of manufacturing a closure unit made of sheet metal or pl

Details Method of manufacturing a closure unit made of sheet metal or pl Method of manufacturing a closure unit made of sheet metal or pl

1989-10-18

1991-06-04

Schmidt, Frederick R.

Sheet metal container making

Method

Forming or treating metallic closure

2291231, 22912513, 72348, B21D 3500

Patent

active

050209558

ABSTRACT:
The method of manufacturing a closure unit formed of sheet metal and containing a holding ring having a ring area bounding a central opening and comprising three substantially flat superjacent and folded sections for attachment with a membrane, contemplates performing in a single deep-drawing operation predetermined shaping and punching operations upon a blank from which there is formed the closure unit.

REFERENCES:
patent: 1690523 (1928-11-01), Bell
patent: 1866469 (1932-07-01), Hirsch
patent: 1884699 (1932-10-01), Hothersall
patent: 2026431 (1935-12-01), Punte
patent: 2063550 (1936-12-01), Hodgson
patent: 3547305 (1970-12-01), Khoury
patent: 4253584 (1981-03-01), Bloeck et al.
patent: 4540105 (1985-09-01), Wright

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