US3915613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for molding plastic covers for containers
Assignee: Albert Obrist AG
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Filing: 1973-04-09
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Granted: 1975-10-28
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Expires: 1993-04-09
Abstract
Abstract An apparatus and 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.
Inventors
- 👤 Heinz Ruch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:09
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B65; B65D; B65D43/00; B65D43/02; B65D43/0235; B65D43/0237; B65D43/0256; B65D43/0258; B65D2401/00; B65D2401/15; B65D2401/25; B65D2543/00; B65D2543/00009; B65D2543/00018; B65D2543/00064; B65D2543/0012; B65D2543/00175; B65D2543/00194; B65D2543/00259; B65D2543/00296; B65D2543/00444; B65D2543/00481; B65D2543/0049; B65D2543/00509; B65D2543/00537; B65D2543/00555; B65D2543/00592; B65D2543/00601; B65D2543/00611; B65D2543/00629; B65D2543/00675; B65D2543/00685; B65D2543/00712; B65D2543/00722; B65D2543/0074; B65D2543/00787; B65D2543/00796; B65D2543/00824; B65D2543/00833; B65D2543/00851; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/80; Y10; Y10S; Y10S425/00; Y10S425/058; Y10S425/227; Y10S425/812
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
339 words
An apparatus including a plurality of die elements for molding a plastic cover for an open mouthed container having a circumferential extending projection on its outer wall in the region of the top edge thereof, said cover having an inverted Ushaped rim in the form of a pair of upstanding circumferential sidewalls, the outer surface of the inner sidewall of said cover having a circumferential outwardly extending bulged portion and the inner surface of the outer sidewall of said cover having a circumferential recess, said apparatus having a closed position for molding and an open position for removing the molded plastic cover, which apparatus including said plurality of die elements comprises a stationary die section including means for introducing plastic into the mold for the plastic cover and a stationary die member having a molding surface shaped to form a portion of said mold corresponding to the outer surface of said outer wall of said cover, a movable die section including a plurality of movable die members, each of said plurality of movable die members being movable in an axial direction in said molding apparatus with respect to the longitudinal axis of said cover, said stationary die section also including a movable die member slidingly engageable therein in an axial direction and cooperating with said stationary die member to form an adjacent molding surface therewith, said molding surfaces formed by said stationary die section corresponding to surfaces of said cover on the opposite wall thickness to those formed by the movable die members of said movable die section, means for moving said movable die members in an axial direction between said open and closed positions of said apparatus, and means for controlling the sequential disengagement of the individual die members from the molded plastic cover whereby said stationary die member is first disengaged, then said movable die member of said stationary die section is disengaged from said plastic cover, and then at least one of the moveable die members of said moveable die section are disengaged from said cover.
Claim 2
Independent Claim
339 words
An apparatus including a plurality of die elements for molding a plastic cover for an open mouthed container having a circumferential extending projection on its outer wall in the region of the top edge thereof, said cover having an inverted Ushaped rim in the form of a pair of upstanding circumferential sidewalls, the outer surface of the inner sidewall of said cover having a circumferential outwardly extending bulged portion and the inner surface of the outer sidewall of said cover having a circumferential recess, said apparatus having a closed position for molding and an open position for removing the molded plastic cover, which apparatus including said plurality of die elements comprises a stationary die section including means for introducing plastic into the mold for the plastic cover and a stationary die member having a molding surface shaped to form a portion of said mold corresponding to the outer surface of said outer wall of said cover, a movable die section including a plurality of movable die members, each of said plurality of movable die members being movable in an axial direction in said molding apparatus with respect to the longitudinal axis of said cover, said stationary die section also including a movable die member slidingly engageable therein in an axial direction and cooperating with said stationary die member to form an adjacent molding surface therewith, said molding surfaces formed by said stationary die section corresponding to surfaces of said cover on the opposite wall thickness to those formed by the movable die members of said movable die section, means for moving said movable die members in an axial direction between said open and closed positions of said apparatus, and means for controlling the sequential disengagement of the individual die members from the molded plastic cover whereby said stationary die member is first disengaged, then said movable die member of said stationary die section is disengaged from said plastic cover, and then at least one of the moveable die members of said moveable die section are disengaged from said cover.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1 wherein said movable die member slidingly engageable within said stationary die member is slidingly supported on said plastic introducing means.
Claim 4
Dependent Claim
22 words
The apparatus of claim 1 wherein said stationary die member includes a portion forming guide means for said slidingly engageable die members.
Claim 5
Dependent Claim
37 words
The apparatus of claim 3 wherein said slidingly engageable die members have at least a portion spaced an axial distance from said stationary die member whereby the axial movement of said engageable die members is thereby defined.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein said cover has in its outer wall a circumferential line of reduced cross sectional thickness.
Claim 7
Dependent Claim
45 words
The apparatus of claim 1 wherein said stationary die member and said slidingly engageable die members define molding surfaces at least corresponding to the outer surface of the outer wall, the inner surfaces of the U-shaped rim and the surface extending therebetween, of said cover.
Claim 8
Dependent Claim
24 words
The apparatus of claim 1 wherein said plastic introducing means is located at about the geometric center of said mold surfaces defining said cover.
Claim 9
Dependent Claim
16 words
The apparatus of claim 1 wherein mold venting means are provided on said stationary die member.
Claim 10
Dependent Claim
15 words
The apparatus of claim 1 wherein the mold for said cover is rectangular in shape.
Claim 11
Dependent Claim
15 words
The apparatus of claim 1 wherein the mold for said cover is circular in shape.
Claim 12
Dependent Claim
13 words
The apparatus of claim 1 wherein said plastic introducing means comprises a nozzle.
Claim 13
Independent Claim
507 words
An apparatus including a plurality of die elements for molding a plastic cover for an open mouthed container having a circumferential extending projection on its outer wall in the region of the top edge thereof, said cover having an inverted U-shaped rim in the form of a pair of upstanding circumferential sidewalls and inwardly extending gripping portion, the outer surface of the inner sidewall of said cover having a circumferential outwardly extending bulged portion and the inner surface of the outer sidewall of said cover having a circumferential recess, said apparatus having a closed position for molding and an open position for removing the molded plastic cover, which apparatus including said plurality of die elements comprises a stationary die section including means for introducing plastic into the mold for the plastic cover and a stationary die member having a molding surface shaped to form a portion of said mold corresponding to the outer surface of said outer wall of said cover, a movable die section including a plurality of movable die members, each of said plurality of movable die members being movable in an axial direction in said molding apparatus with respect to the longitudinal axis of said cover, said stationary die section including a first movable die member also slidingly supported on said plastic introducing means and slidingly engageable in an axial direction in said stationary die section to form an adjacent molding surface with said stationary die member, said molding surfaces formed by said stationary die section corresponding to surfaces of said cover on the opposite wall thickness to those formed by the movable die members of said movable die section, said movable die section including a movable die member, a third movable die member and a fourth movable die member, said second movable die member having a molding surface shaped to form a portion of said mold corresponding to the upper surface of said gripping flap and at least a part of the upper portion of the U-shaped rim of said cover, said third movable die member having a molding surface shaped to form a portion of said mold corresponding to the upper surface of the depressed central portion of said cover, the inner surface of the inner wall of said cover and the bottom surface of said gripping flap, said fourth movable die member having a molding surface shaped to form a portion of said mold corresponding to the upper surface of the outer portion of the U-shaped rim of said cover, said third movable die member being slidably engageable in said first movable die member and said second movable die member, said second movable die member being slidably engageable in said fourth movable die member, means for moving said plurality of movable die members in an axial direction between said open and closed positions of said apparatus, and means for disengaging sequentially said stationary die member, said first movable die member, said second movable die member, said third movable die member and said fourth movable die member from the molded plastic cover.
Claim 14
Independent Claim
507 words
An apparatus including a plurality of die elements for molding a plastic cover for an open mouthed container having a circumferential extending projection on its outer wall in the region of the top edge thereof, said cover having an inverted U-shaped rim in the form of a pair of upstanding circumferential sidewalls and inwardly extending gripping portion, the outer surface of the inner sidewall of said cover having a circumferential outwardly extending bulged portion and the inner surface of the outer sidewall of said cover having a circumferential recess, said apparatus having a closed position for molding and an open position for removing the molded plastic cover, which apparatus including said plurality of die elements comprises a stationary die section including means for introducing plastic into the mold for the plastic cover and a stationary die member having a molding surface shaped to form a portion of said mold corresponding to the outer surface of said outer wall of said cover, a movable die section including a plurality of movable die members, each of said plurality of movable die members being movable in an axial direction in said molding apparatus with respect to the longitudinal axis of said cover, said stationary die section including a first movable die member also slidingly supported on said plastic introducing means and slidingly engageable in an axial direction in said stationary die section to form an adjacent molding surface with said stationary die member, said molding surfaces formed by said stationary die section corresponding to surfaces of said cover on the opposite wall thickness to those formed by the movable die members of said movable die section, said movable die section including a movable die member, a third movable die member and a fourth movable die member, said second movable die member having a molding surface shaped to form a portion of said mold corresponding to the upper surface of said gripping flap and at least a part of the upper portion of the U-shaped rim of said cover, said third movable die member having a molding surface shaped to form a portion of said mold corresponding to the upper surface of the depressed central portion of said cover, the inner surface of the inner wall of said cover and the bottom surface of said gripping flap, said fourth movable die member having a molding surface shaped to form a portion of said mold corresponding to the upper surface of the outer portion of the U-shaped rim of said cover, said third movable die member being slidably engageable in said first movable die member and said second movable die member, said second movable die member being slidably engageable in said fourth movable die member, means for moving said plurality of movable die members in an axial direction between said open and closed positions of said apparatus, and means for disengaging sequentially said stationary die member, said first movable die member, said second movable die member, said third movable die member and said fourth movable die member from the molded plastic cover.
References Cited (Backward Citations)
US2266831A
Cited
US2975481A
Cited
US2875472A
Cited
US3196483A
Cited
US3584111A
Cited
US3737277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |