Patent US3689625A successfully refreshed from Google Patents.
US3689625A
Expired / Lapsed
US
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Method of forming a molded ring gasket
Assignee: Continental Can Co Inc
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Filing: 1969-06-12
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Granted: 1972-09-05
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Expires: 1989-06-12
Abstract
Abstract A punch for forming a closure gasket which includes at least two annular grooves, each having a land radially inwardly thereof, a plurality of inwardly extending notches in the lands and extending between the grooves, and generally radially and generally axially facing surfaces disposed outwardly of the grooves for forming a gasket along and inwardly of the skirt portion of a closure. The method includes disposing gasket forming compound on the inner surface of the skirt of a cap shell, moving a punch into a gasket channel of the shell to form a gasket, and allowing air entrapped with the compound to escape radially inwardly of the punch while directing excess gasket compound into a plurality of concentric rings. The closure comprises a cap shell with a gasket having sealing surfaces disposed on the skirt and in a gasket channel just inwardly of the skirt, and excess gasket forming compound disposed in a plurality of rings just inside the channel. The top panel center portion of the closure, and the spaces adjacent the rings, preferably are free of compound or contain not more than relatively thin or intermittent deposits of gasket forming compound.
Inventors
- 👤 Donald H Zipper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:03
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/18; B29C70/00; B29C70/68; B29C70/78; B29C70/80; B65; B65D; B65D41/00; B65D41/02; B65D41/04; B65D41/0435; B65D41/0457; B29C43/32; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3634; B29C33/00; B29C33/10; B29C37/00; B29C37/006; B29L; B29L2031/00; B29L2031/56; B29L2031/565
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
A method of forming a gasket in a shell element to form a gasketed closure unit, said method comprising disposing a ring of an at least partially fluent gasket forming compound along an inner surface of the skirt portion of a shell element, forcing said compound along said skirt portion and at least partially radially inwardly toward an outer margin portion of the top panel portion of said shell, fully filling said outer margin portion with said compound, and, while allowing air entrapped with said compound to escape both radially inwardly and circumferentially of said outer margin portion, forcing a portion of excess compound circumferentially of said outer margin portion by preventing substantial, radially inward free flow of said compound, thereafter allowing limited radial flow of compound, and again forcing a portion of said compound circumferentially before allowing free radially inward movement thereof, whereupon entrapped air is vented, and excess compound forms at least portions of two circumferential rings radially inwardly of said outer margin portion of said shell element.
Claim 2
Independent Claim
170 words
A method of forming a gasket in a shell element to form a gasketed closure unit, said method comprising disposing a ring of an at least partially fluent gasket forming compound along an inner surface of the skirt portion of a shell element, forcing said compound along said skirt portion and at least partially radially inwardly toward an outer margin portion of the top panel portion of said shell, fully filling said outer margin portion with said compound, and, while allowing air entrapped with said compound to escape both radially inwardly and circumferentially of said outer margin portion, forcing a portion of excess compound circumferentially of said outer margin portion by preventing substantial, radially inward free flow of said compound, thereafter allowing limited radial flow of compound, and again forcing a portion of said compound circumferentially before allowing free radially inward movement thereof, whereupon entrapped air is vented, and excess compound forms at least portions of two circumferential rings radially inwardly of said outer margin portion of said shell element.
Claim 3
Dependent Claim
61 words
A method as defined in claim 1 in which allowing air entrapped with said compound to escape includes the step of moving compound flow restricting means closely adjacent said top panel portion of said shell a distance such that air may escape through said distance, but wherein sealing compound tending to flow therethrough is substantially solidified and will not flow therethrough.
Claim 4
Independent Claim
151 words
A method of simultaneously forming a gasket in a shell member to produce a gasketed closure unit and venting air entrapped with a mass of gasket-forming compound disposed on the skirt portion and a radially outer margin of the top panel portion of said shell member, said method comprising first moving a molding punch into a closely overlying relation to said mass of material, preventing free radially inward flow of material by surrounding a periphery of said material with a plurality of lands containing venting notches therein and forming a plurality of concentric, circular grooves, further axially moving said punch to a position wherein said lands substantially engage the inner surface of said top panel, whereby air may be vented from between said lands and said inner surface, and said compound and additional air may pass through said notches, while said compound is forced circumferentially in said grooves between said notches.
Claim 5
Independent Claim
151 words
A method of simultaneously forming a gasket in a shell member to produce a gasketed closure unit and venting air entrapped with a mass of gasket-forming compound disposed on the skirt portion and a radially outer margin of the top panel portion of said shell member, said method comprising first moving a molding punch into a closely overlying relation to said mass of material, preventing free radially inward flow of material by surrounding a periphery of said material with a plurality of lands containing venting notches therein and forming a plurality of concentric, circular grooves, further axially moving said punch to a position wherein said lands substantially engage the inner surface of said top panel, whereby air may be vented from between said lands and said inner surface, and said compound and additional air may pass through said notches, while said compound is forced circumferentially in said grooves between said notches.
Claim 6
Dependent Claim
29 words
A method as defined in claim 3 in which said venting notches in the oUtermost land are of a lesser depth than said venting notches in the innermost land.
References Cited (Backward Citations)
US3004298A
Cited
GB984032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |