Patent US3760751A successfully refreshed from Google Patents.
US3760751A
Expired / Lapsed
US
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Container body and a method of forming the same
Assignee: ALUMINUM CO PITTSBURGH US
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Filing: 1971-10-29
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Granted: 1973-09-25
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Expires: 1991-10-29
Abstract
Abstract An aluminum container body and a method of forming the same by ironing the side wall of a drawn cup to thin and lengthen it, and reforming the bottom end wall of the ironed cup to form therein an upwardly domed central portion connected through a substantially vertical wall section and an outwardly and upwardly tapered shoulder into the side wall of the can body. The ironed can body may have a protective coating applied to its inner surfaces and cured thereon prior to reforming the end wall.
Inventors
- 👤 L Dunn
- 👤 J Morran
- 👤 D Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:56
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A method of forming a light weight can body comprising in sequence the steps of thinning and lengthening, without heat treatment, the side wall of a drawn cup made of at least full hard temper aluminum alloy by moving the cup through at least one ironing ring by means of an ironing punch having a rounded corner around its forward end to form a can body having a substantially flat bottom end wall with a rounded corner therearound leading into the side wall of the can body, withdrawing the ironing punch from the ironed can body, heating at least the bottom end wall of the can body to reduce its temper, introducing a reforming punch into the can body, and reforming the bottom end wall of the can body between the reforming punch and a reforming die to form an upwardly domed central portion therein connected to the side wall of thE can body by an outwardly and upwardly flared shoulder.
Claim 2
Independent Claim
161 words
A method of forming a light weight can body comprising in sequence the steps of thinning and lengthening, without heat treatment, the side wall of a drawn cup made of at least full hard temper aluminum alloy by moving the cup through at least one ironing ring by means of an ironing punch having a rounded corner around its forward end to form a can body having a substantially flat bottom end wall with a rounded corner therearound leading into the side wall of the can body, withdrawing the ironing punch from the ironed can body, heating at least the bottom end wall of the can body to reduce its temper, introducing a reforming punch into the can body, and reforming the bottom end wall of the can body between the reforming punch and a reforming die to form an upwardly domed central portion therein connected to the side wall of thE can body by an outwardly and upwardly flared shoulder.
Claim 3
Dependent Claim
39 words
A method as set forth in claim 1 in which metal from said rounded corner of the can body is drawn into said upwardly domed central portion during said reforming of the bottom end wall of the can body.
Claim 4
Dependent Claim
44 words
A method as set forth in claim 1 in which a substantially vertical wall section is formed in the bottom end wall of the can body extending downward from the periphery of the central domed portion to the inner edge of the flared shoulder.
Claim 5
Dependent Claim
38 words
A method as set forth in claim 1 in which small radii are formed on the top and bottom of the vertical wall section connecting such wall section with the central domed portion and with the flared shoulder.
Claim 6
Independent Claim
171 words
A method of forming a light weight can body comprising in sequence the steps of ironing, without heat treatment, the side wall of a cup made of at least full hard temper aluminum alloy by moving the cup through at least one ironing ring by means of a punch having a rounded corner on its forward end leading into the side wall of the punch to thin and lengthen the side wall of the cup to form a can body, withdrawing the ironing punch from the ironed can body, coating at least part of the surface of the can body, heating the can body to cure the coating thereon, and introducing a reforming punch into the can body, and reforming the bottom end wall of the can body between the reforming punch and a reforming die to form an upwardly domed central portion therein with a substantially vertical wall section extending downward from its periphery to an outwardly and upwardly flared shoulder leading into the side wall of the can body.
Claim 7
Independent Claim
171 words
A method of forming a light weight can body comprising in sequence the steps of ironing, without heat treatment, the side wall of a cup made of at least full hard temper aluminum alloy by moving the cup through at least one ironing ring by means of a punch having a rounded corner on its forward end leading into the side wall of the punch to thin and lengthen the side wall of the cup to form a can body, withdrawing the ironing punch from the ironed can body, coating at least part of the surface of the can body, heating the can body to cure the coating thereon, and introducing a reforming punch into the can body, and reforming the bottom end wall of the can body between the reforming punch and a reforming die to form an upwardly domed central portion therein with a substantially vertical wall section extending downward from its periphery to an outwardly and upwardly flared shoulder leading into the side wall of the can body.
Claim 8
Dependent Claim
38 words
A method as set forth in claim 5 in which small radii are formed on the top and bottom of the vertical wall section connecting such wall section with the central domed portion and with the flared shoulder.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |