US3763807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming necked-in can bodies
Assignee: Continental Can Co Inc
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Filing: 1970-12-21
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Granted: 1973-10-09
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Expires: 1990-12-21
Abstract
Abstract This disclosure relates to the necking-in of can bodies. It has been found that by inwardly curling an end portion of a can body prior to the performing of a necking-in operation thereon, the usual wrinkle formation resulting from a conventional necking-in operation is eliminated. The precurling may be performed by a rolling operation or by a die forming operation.
Inventors
- 👤 J Hilgenbrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:25
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2638; Y; Y10; Y10S; Y10S72/00; Y10S72/715
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A method of necking-in an end portion of a can body having a side seam in a manner to eliminate wrinkling particularly adjacent the side seam, said method comprising the steps of first inwardly curling the can body end portion utilizing a curling device, and then applying a necking-in die assembly to the inwardly curled end portion only in an axial direction and further changing the configuration of said end portion from an inwardly curled configuration to a cylindrical configuration of reduced diameter as compared to the original diameter of the can body and a conical intermediate configuration joining the reduced diameter cylindrical configuration to the remainder of the can body.
Claim 2
Independent Claim
111 words
A method of necking-in an end portion of a can body having a side seam in a manner to eliminate wrinkling particularly adjacent the side seam, said method comprising the steps of first inwardly curling the can body end portion utilizing a curling device, and then applying a necking-in die assembly to the inwardly curled end portion only in an axial direction and further changing the configuration of said end portion from an inwardly curled configuration to a cylindrical configuration of reduced diameter as compared to the original diameter of the can body and a conical intermediate configuration joining the reduced diameter cylindrical configuration to the remainder of the can body.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the inwardly curling of said end portion is restricted to a diameter at least as great as the diameter of said reduced diameter cylindrical configuration.
Claim 4
Independent Claim
143 words
A method of necking-in an end portion of a can body having a side seam in a manner to eliminate wrinkling particularly adjacent the side seam, said method comprising the steps of first inwardly curling the can body end portion, and then applying a necking-in die assembly to the inwardly curled end portion and further changing the configuration of said end portion from an inwardly curled configuration to a cylindrical configuration of reduced diameter as compared to the original diameter of the can body and a conical intermediate configuration joining the reduced diameter cylindrical configuration to the remainder of the can body, together with the formation of stress relieving notches in the extreme end edge of said end portion in positions to be disposed on opposite sides of and closely adjacent said side seam, said notches being formed prior to said curling step.
Claim 5
Independent Claim
143 words
A method of necking-in an end portion of a can body having a side seam in a manner to eliminate wrinkling particularly adjacent the side seam, said method comprising the steps of first inwardly curling the can body end portion, and then applying a necking-in die assembly to the inwardly curled end portion and further changing the configuration of said end portion from an inwardly curled configuration to a cylindrical configuration of reduced diameter as compared to the original diameter of the can body and a conical intermediate configuration joining the reduced diameter cylindrical configuration to the remainder of the can body, together with the formation of stress relieving notches in the extreme end edge of said end portion in positions to be disposed on opposite sides of and closely adjacent said side seam, said notches being formed prior to said curling step.
Claim 6
Dependent Claim
31 words
The method of claim 3 wherein the inwardly curling of said end portion is restricted to a diameter at least as great as the diameter of said reduced diameter cylindrical configuration.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein said curling operation is accomplished by a rolling operation.
Claim 8
Dependent Claim
16 words
The method of claim 4 wherein said curling operation is accomplished by a die forming operation.
Claim 9
Dependent Claim
19 words
The method Of claim 1 wherein the conical intermediate configuration is formed to be a straight line conical configuration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |