Patents Assigned to Alcan Rorschach AG
  • Method of manufacturing a closure unit made of sheet metal or plating and container having a closure unit obtained thereby
    Patent number: 5020955
    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.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: June 4, 1991
    Assignee: Alcan Rorschach AG
    Inventor: Horst Zumsteg
  • Closure unit made of sheet metal or plating, method of manufacturing such a closure unit and container having a closure unit obtained thereby
    Patent number: 4915254
    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.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: April 10, 1990
    Assignee: Alcan Rorschach AG
    Inventor: Horst Zumsteg