US3688718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for scoring metal container ends
Assignee: Alcoa Corp
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Filing: 1969-10-23
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Granted: 1972-09-05
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Expires: 1989-10-23
Abstract
Abstract A method and apparatus for scoring a metal container end to provide a tear-out panel, wherein the scoring is accomplished with a greatly reduced tendency for any internal protective coating on said end to be damaged and for the residual metal in the score line to fracture. During the scoring operation the container end is supported on an anvil die having an arcuately domed rib thereon which, in cooperation with the advance of the scoring indenter, works the metal in the lower portion of the metal sheet and distributes the working stresses normally produced in the metal during the scoring operation.
Inventors
- 👤 Howard D Schrecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:10
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012; B65D17/404
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A method of scoring a metal container end to provide a tearout panel therein comprising the steps of: a. supporting a container end on an anvil die having a rib thereon with an arcuately domed upper surface and the outline of the tear-out panel to be defined, said rib having a radius of curvature in the range of 0.010 to 0.015 inch; b. moving a scoring indenter against the upper surface of the container end opposite the arcuately domed rib; and c. scoring the container end with the indenter to the desired depth while simultaneously working the lower portion of the metal sheet to effect distribution of the stresses normally produced in the metal during the scoring operation.
Claim 2
Independent Claim
118 words
A method of scoring a metal container end to provide a tearout panel therein comprising the steps of: a. supporting a container end on an anvil die having a rib thereon with an arcuately domed upper surface and the outline of the tear-out panel to be defined, said rib having a radius of curvature in the range of 0.010 to 0.015 inch; b. moving a scoring indenter against the upper surface of the container end opposite the arcuately domed rib; and c. scoring the container end with the indenter to the desired depth while simultaneously working the lower portion of the metal sheet to effect distribution of the stresses normally produced in the metal during the scoring operation.
Claim 3
Dependent Claim
28 words
A method of scoring a metal container end as set forth in claim 1 in which the metal container end has a protective coating on its inner surface.
Claim 4
Dependent Claim
35 words
A method of scoring a metal container end as set forth in claim 1 in which the formation of the score line is effected by means of a scoring indenter having a truncated V-shape cross-section.
Claim 5
Dependent Claim
33 words
A method of scoring a metal container end as set forth in claim 3 wherein the flat face of the truncated V-shaped scoring indenter is 0.0040 + or - 0.0005 inch in width.
Claim 6
Independent Claim
110 words
An apparatus for scoring a thin metal container end to provide a tear-out section, comprising aN anvil die on which the container end is supported in scoring position, a reciprocable indenter movable towards and away from said anvil die, an arcuately domed rib on said anvil die facing said scoring indenter and supporting the container end, said arcuately domed rib having a radius of curvature in the range of 0.010 to 0.015 inch and cooperating with the scoring indenter during scoring of the container end to subject the lower portion of the metal of the container end to a working action to distribute the stresses induced in the scoring operation.
Claim 7
Independent Claim
110 words
An apparatus for scoring a thin metal container end to provide a tear-out section, comprising aN anvil die on which the container end is supported in scoring position, a reciprocable indenter movable towards and away from said anvil die, an arcuately domed rib on said anvil die facing said scoring indenter and supporting the container end, said arcuately domed rib having a radius of curvature in the range of 0.010 to 0.015 inch and cooperating with the scoring indenter during scoring of the container end to subject the lower portion of the metal of the container end to a working action to distribute the stresses induced in the scoring operation.
Claim 8
Dependent Claim
16 words
An apparatus as defined in claim 5 wherein the scoring indenter has a truncated V-shape cross-section.
Claim 9
Dependent Claim
25 words
An apparatus as defined in claim 6 wherein the flat face of the truncated V-shaped scoring indenter is 0.0040 + or -0.0005 inch in width.
References Cited (Backward Citations)
FR488984A
Cited
US3563199A
Cited
US3254790A
Cited
US3554400A
Cited
US3359773A
Cited
US3451367A
Cited
US3338199A
Cited
US3507418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |