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US3786957A
Expired / Lapsed
US
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Double stage necking
Assignee: Continental Can Co Inc
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Filing: 1971-03-22
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Granted: 1974-01-22
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Expires: 1991-03-22
Abstract
Abstract This disclosure relates to the necking-in of can bodies for the purpose of applying smaller diameter or special ends thereon. Previously experienced extreme difficulties in properly neckingin can bodies have been eliminated by first necking-in a larger than normal end portion of a can body to an intermediate diameter and then utilizing tooling for performing the desired necking in operation to further neck-in the extreme end portion only of the previously necked-in longer end portion.
Inventors
- 👤 J Hilgenbrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2638; B65; B65D; B65D7/00; B65D7/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
A one-piece conventionally formed can body of the type including a side seam and particularly constructed for the reception of an end of a diameter materially less than a normally provided end for a like diameter can body, said can body being a double necked-in can body including a main body portion of a normal diameter and forming a major portion of the length of said can body, an extreme end portion of a greatly reduced diameter and having an open terminal end of a diameter at least as great as the remainder of said extreme end portion, said open terminal end being at the extreme end of said can body for directly receiving thereon an end of a diameter materially less than a normally provided end for a can body of the diameter of said main body portion, and an intermediate portion of an intermediate diameter, the combined lengths of said extreme end portion and said intermediate portion being greatly less than the length of said main body portion, and a frustoconical shoulder portion disposed between adjacent ones of said can body portions.
Claim 2
Dependent Claim
184 words
A one-piece conventionally formed can body of the type including a side seam and particularly constructed for the reception of an end of a diameter materially less than a normally provided end for a like diameter can body, said can body being a double necked-in can body including a main body portion of a normal diameter and forming a major portion of the length of said can body, an extreme end portion of a greatly reduced diameter and having an open terminal end of a diameter at least as great as the remainder of said extreme end portion, said open terminal end being at the extreme end of said can body for directly receiving thereon an end of a diameter materially less than a normally provided end for a can body of the diameter of said main body portion, and an intermediate portion of an intermediate diameter, the combined lengths of said extreme end portion and said intermediate portion being greatly less than the length of said main body portion, and a frustoconical shoulder portion disposed between adjacent ones of said can body portions.
Claim 3
Dependent Claim
40 words
The can body of claim 1 wherein the difference in diameters of said normal diameter and said intermediate portion is on the order of 50 percent of the difference in diameters of said normal diameter and said extreme end portion.
References Cited (Backward Citations)
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US2208431A
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US2328381A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |