Closure unit made of sheet metal or plating, method of manufacturing such a closure unit and container having a closure unit obtained thereby
AssigneeAlcan Rorschach AG
InventorHorst Zumsteg
Life of this patent
Estimating the term…
Abstract
The closure unit can be manufactured in a single deep-drawing operation. During the course of a predetermined stroke of the single deep-drawing operation, such as the downward stroke up to a lower dead-center position, a blank is punched out, a ring or marginal rim and a collar are formed, a central opening is punched out and a section extending peripherally to the cut edge is downwardly extended. During the upward stroke predetermined sections of the extended collar are rolled and subsequently squeezed together.
Claims10
A closure unit formed of sheet metal for sterilizable containers, comprising:
- a holding ring having a ring area;
- said ring area having a sealing surface;
- said holding ring being flangeable to an associated sterilizable container;
- said ring area defining a closure opening having a cut edge;
- said cut edge of said closure opening being bent over into said ring area;
- a membrane having a tear-back tab;
- said membrane covering said closure opening and being sealed onto said sealing surface of said ring area;
- said ring area comprising three substantially parallel, superjacent and folded material sections;
- said three substantially parallel, superjacent and folded material sections defining a top material section forming said sealing surface of said ring area, an intermediate material section and a bottom material section;
- and
- said cut edge being located at said intermediate material section between said top material section and said bottom material section.
The combination of a container and a closure unit formed of sheet metal, wherein:
- said closure unit comprises:
- a holding ring having a ring area;
- said ring area having a sealing surface;
- said holding ring being flangeable to said
- said ring defining a closure opening having a cut edge;
- said cut edge of said closure opening being bent over into said ring area;
- a membrane having a tear-back tab;
- said membrane covering said closure opening and being sealed onto said sealing surface of said ring area;
- said ring surface comprising three substantially parallel, superjacent and folded material sections;
- said three substantially parallel, superjacent and folded material sections defining a top material section forming said sealing surface of said ring area, an intermediate material section and a bottom material section;
- and
- said cut edge being located at said intermediate material section between said top material section and said bottom material section.
Dependencies are inferred from the claim text.