US3715054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Can end closure curl
Assignee: Primerica Inc
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Filing: 1971-06-11
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Granted: 1973-02-06
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Expires: 1991-06-11
Abstract
Abstract A continuous curl formed on the periphery of a can end component prior to the first and second operations of double seaming the can end component to an end of a can body has an inner annular portion of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1> R2> R3, and an outer annular portion of a configuration substantially that of a generally planar surface which is parallel to a plane formed by the innermost marginal edge of the inner arc of the inner annular portion of the continuous curl. A curler tool for forming the continuous curl has a curl-forming groove which has a contour substantially the same as the configuration of the inner and outer annular portions of the continuous curl formed by the curler tool.
Inventors
- 👤 E Gedde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
B; B21; B21D; B21D19/00; B21D19/12; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2623; B21D51/38; B21D51/44; B65; B65D; B65D7/00; B65D7/12; B65D7/34; B65D7/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A continuous curl formed on the periphery of a can end component prior to the first and second operations of double seaming said can end component to an end of a can body, comprising: an inner annular portion of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1 > R2 > R3; and an outer portion of a configuration substantially that of an annular generally planar surface which is parallel to a plane formed by the innermost marginal edge of said inner arc.
Claim 2
Dependent Claim
120 words
A continuous curl formed on the periphery of a can end component prior to the first and second operations of double seaming said can end component to an end of a can body, comprising: an inner annular portion of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1 > R2 > R3; and an outer portion of a configuration substantially that of an annular generally planar surface which is parallel to a plane formed by the innermost marginal edge of said inner arc.
Claim 3
Dependent Claim
120 words
A continuous curl formed on the periphery of a can end component prior to the first and second operations of double seaming said can end component to an end of a can body, comprising: an inner annular portion of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1 > R2 > R3; and an outer portion of a configuration substantially that of an annular generally planar surface which is parallel to a plane formed by the innermost marginal edge of said inner arc.
Claim 4
Dependent Claim
120 words
A continuous curl formed on the periphery of a can end component prior to the first and second operations of double seaming said can end component to an end of a can body, comprising: an inner annular portion of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1 > R2 > R3; and an outer portion of a configuration substantially that of an annular generally planar surface which is parallel to a plane formed by the innermost marginal edge of said inner arc.
Claim 5
Dependent Claim
19 words
A continuous curl according to claim 1 wherein R1 is approximately equal to 3R2, and approximately equal to 6R3.
Claim 6
Dependent Claim
24 words
A continuous curl according to claim 1 wherein R1 approximately equals 0.166 inch, R2 approximately equals 0.050 inch, and R3 approximately equals 0.025 inch.
Claim 7
Dependent Claim
135 words
A can end component for double seaming to an end of a can body, comprising: a can end defining portion; and an integral peripheral flange, said flange being annular in outline and having an outer portion in the form of a continuous curl, said curl having an inner section of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1 > R2 > R3, and an outer section of a configuration substantially that of an annular generally planar surface which is in a plane substantially parallel to a plane formed by the innermost marginal edge of said inner arc.
Claim 8
Dependent Claim
135 words
A can end component for double seaming to an end of a can body, comprising: a can end defining portion; and an integral peripheral flange, said flange being annular in outline and having an outer portion in the form of a continuous curl, said curl having an inner section of a configuration substantially that of a surface of revolution generated by three successive merging arcs including an inner arc struck by a first radius R1, a middle arc struck by a second radius R2, and an outer arc struck by a third radius R3, where R1 > R2 > R3, and an outer section of a configuration substantially that of an annular generally planar surface which is in a plane substantially parallel to a plane formed by the innermost marginal edge of said inner arc.
Claim 9
Dependent Claim
20 words
A can end component according to claim 4 wherein R1 is approximately equal to 3R2, and approximately equal to 6R3.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |