Claims
- 1. A container wall made of work hardened sheet metal having a generally planar wall with at least one substantially rigid inwardly displaceable opening panel therein bounded in substantial part by a weakening line which includes a fracturable web of metal defining a locus of separation of the opening panel from the adjacent portion of said wall, an integral outwardly projecting deflectable portion in said adjacent wall portion adjacent to said weakening line, and a zone of coining of reduced metal thickness in said adjacent wall portion adjacent to said weakening line to facilitate forming the weakening line of a desired strength level in sheet material which may vary in thickness within commercially accepted ranges.
- 2. A container wall as set forth in claim 1 which comprises work hardened aluminum alloy sheet material.
- 3. A container wall as set forth in claim 1 in which said zone of coining has been formed substantially concurrently with forming of said weakening line.
- 4. A container wall as set forth in claim 1 in which said zone of coining is spaced from said weakening line a distance approximately equal to one to three times the thickness of the metal in the container wall.
- 5. A container wall as set forth in claim 1 in which said opening panel is substantially circular and substantially uniformly convex toward the interior of the container.
- 6. A container wall as set forth in claim 1 in which the upper surface of the opening panel contiguous with said weakening line is disposed in substantial alignment with the undersurface of said adjacent wall portion across said weakening line.
- 7. A container wall as set forth in claim 1 in which said fracturable web is disposed above the plane of said planar wall.
REFERENCE TO RELATED APPLICATION
This is a division of application Ser. No. 466,405, filed May 2, 1974, now U.S. Pat. No. 3,946,683, which is a continuation-in-part of my U.S. Application Ser. No. 318,476, filed Dec. 26, 1972 for Tabless Container Opening Device and Method and Tools for Forming the Same, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3902626 |
Jordan et al. |
Sep 1975 |
|
3912114 |
Morran et al. |
Oct 1975 |
|
3929251 |
Urmston |
Dec 1975 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
466405 |
May 1974 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
318476 |
Dec 1972 |
|