Albert Obrist Ag

Albert Obrist & Co.

Heinz Ruch

A method for molding plastic covers for containers wherein the molding apparatus includes a stationary die section, including a fixed die member having a molding surface shaped to form a portion for the mold corresponding to the outer surface of the side of the cover, a movable die section including a plurality of movable die members, at least one of the movable die members being slidingly engaged within said stationary die member, a means for moving the plurality of movable die members in an axial direction between the closed and open positions of the molding apparatus, and a means for controlling the disengagement of the individual die members from the molded plastic cover whereby the fixed die member is first disengaged prior to the plurality of movable die members being sequentially disengaged from the cover. The plastic cover is adapted to cover an open-mouthed container which has a circumferentially extending projection on its outer wall in the region of the top edge thereof, wherein the cover has an inverted U-shaped rim in the form of a pair of upstanding circumferential sidewalls and a depressed central portion, the inner sidewall of the cover having a circumferential extending bulged portion and an inwardly extending gripping flap, the inner surface of the outer sidewall of the cover having a circumferential recess shaped to engage the projection on the container and to form a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off portion, the outer surface of the outer sidewall being substantially straightline in cross-section and preferably tapered from top to bottom.

Molded plastic covers for containers

A method for molding plastic covers for containers wherein the molding apparatus includes a stationary die section, including a fixed die member having a molding surface shaped to form a portion for the mold corresponding to the outer surface of the side of the cover, a movable die section including a plurality of movable die members, at least one of the movable die members being slidingly engaged within said stationary die member, a means for moving the plurality of movable die members in an axial direction between the closed and open positions of the molding apparatus, and a means for controlling the disengagement of the individual die members from the molded plastic cover whereby the fixed die member is first disengaged prior to the plurality of movable die members being sequentially disengaged from the cover. The plastic cover is adapted to cover an open mouthed container which has a circumferentially extending projection on its outer wall in the region of the top edge thereof, wherein the cover has an inverted U-shaped rim in the form of a pair of upstanding circumferential sidewalls and a depressed central portion, the inner sidewall of the cover having a circumferential extending bulged portion and an inwardly extending gripping flap, the inner surface of the outer sidewall of the cover having a circumferential recess shaped to engage the projection on the container and to form a circumferential weakening line which subdivides the cover into a first cover member reusable as a cover and a second cover member being a tear-off portion, the outer surface of the outer sidewall being substantially straight line in cross-section and preferably tapered from top to bottom.

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Basel, Switzerland

Heinz Ruch