US3855862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draw and wall iron process for metal cans
Assignee: Continental Can Co Inc
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Filing: 1973-04-23
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Granted: 1974-12-24
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Expires: 1993-04-23
Abstract
Abstract A method for forming a container in a reduced number of steps and a container made therefrom which has a thin upper wall section and a heavier lower wall section and bottom to provide extra resistance to impacts in the more normally vulnerable areas of the container, the method also comprehending forming a container from a wall ironed cup and leaving a flange on the open top of the container thus eliminating a common problem of split flanges and also simplifying the trimming operation by a simple die cut rather than by conventional rotary knife cutting.
Inventors
- 👤 J Moller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:07
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/20; B21D22/28; B21D22/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
In a method of forming a metal container wherein a metal blank is drawn into a shallow cup having a side wall, base at one end and an opening at the other end and wherein the base and side wall are of the same thickness, comprising: first wall ironing the side wall to elongate and thin the same and deepen the cup; then redrawing the cup to a smaller diameter by pulling the metal transaxially inwardly and then axially to cause the metal to flow circumferentially in a hoop compressive direction and axially in a tensile direction; and then terminating the redrawing and leaving an edge portion of the side wall about said open end as an outwardly projecting flange and then trimming said flange by cutting the same with a circular die.
Claim 2
Dependent Claim
133 words
In a method of forming a metal container wherein a metal blank is drawn into a shallow cup having a side wall, base at one end and an opening at the other end and wherein the base and side wall are of the same thickness, comprising: first wall ironing the side wall to elongate and thin the same and deepen the cup; then redrawing the cup to a smaller diameter by pulling the metal transaxially inwardly and then axially to cause the metal to flow circumferentially in a hoop compressive direction and axially in a tensile direction; and then terminating the redrawing and leaving an edge portion of the side wall about said open end as an outwardly projecting flange and then trimming said flange by cutting the same with a circular die.
Claim 3
Independent Claim
160 words
A method of making a container comprising: cutting a blank from a sheet of metal, then drawing the blank into a cup having a bottom and a side wall, then wall ironing the cup to thin the side wall and elongate the same axially, then redrawing the cup to reduce its diameter and elongate it axially and to form a side wall having a thick lower portion and thin upper portion by drawing the bottom of the cup between a pair of opposed dies providing limited drawing surfaces transverse to the axis of the container and continuing the redrawing by passing the cup immediately thereafter through an axial drawing surface in one of the dies extending concentric with the axis of the container, terminating the redrawing operation just prior to the exit of the marginal edge portion of the side wall from between said transaxial surfaces to leave an outwardly flared cover-attachment flange about the open end of the container.
Claim 4
Independent Claim
160 words
A method of making a container comprising: cutting a blank from a sheet of metal, then drawing the blank into a cup having a bottom and a side wall, then wall ironing the cup to thin the side wall and elongate the same axially, then redrawing the cup to reduce its diameter and elongate it axially and to form a side wall having a thick lower portion and thin upper portion by drawing the bottom of the cup between a pair of opposed dies providing limited drawing surfaces transverse to the axis of the container and continuing the redrawing by passing the cup immediately thereafter through an axial drawing surface in one of the dies extending concentric with the axis of the container, terminating the redrawing operation just prior to the exit of the marginal edge portion of the side wall from between said transaxial surfaces to leave an outwardly flared cover-attachment flange about the open end of the container.
Claim 5
Dependent Claim
28 words
The method according to claim 2 and then trimming the flange by cutting the same with an annular cutter while the flange is held between said transaxial surfaces.
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |