Double-walled container and method of manufacture
View Patent ↗A double-walled container and method of manufacturing are disclosed. A first container having a smaller diameter than a second container is inserted into the second container. A portion of the first container is expanded and/or a portion of the second container may be narrowed so that first and second container is interlocked and form a double-walled container. The first and/or second containers may have ribs. An air gap between the first and second containers provides thermal insulation to contents of the double-walled container.
1. A method of manufacturing a metal double-walled container comprising:
providing a first metal container having a diameter X;
providing a second metal container having a diameter Y, wherein the diameter Y is larger than the diameter X;
inserting the first metal container into the second metal container; and
interlocking the first metal container and the second metal container so that a gap lies between a first portion of the first metal container and a first portion of the second metal container, wherein interlocking comprises:
inserting an expansion die into an open end of the first metal container so that the diameter X of a second portion of the first metal container expands; and
narrowing the diameter Y of a second portion of the second metal container so that the first metal container and the second metal container become interlocked; and
narrowing an opening of the metal double-walled container to accept a closure.
2. The method of claim 1 wherein the diameter Y of a third portion of the second metal container expands as the diameter X of the second portion of the first metal container is expanded.
3. The method of claim 1 wherein the first metal container and/or the second metal container have ribs.
4. A method of claim 1 wherein inserting the expansion die occurs prior to narrowing the diameter Y of the second portion of the second metal container.
5. The method of claim 1 wherein narrowing the diameter Y of the second portion of the second metal container occurs prior to inserting the expansion die.
6. A method of manufacturing a metal double-walled container comprising:
providing a first metal container having a diameter X and a height H;
providing a second metal container having a diameter Y and a height J,
wherein the diameter Y is larger than the diameter X and the height H is taller than the height J;
inserting the first metal container into the second metal container; and
interlocking the first metal container and the second metal container so that a gap lies between a first portion of the first metal container and a first portion of the second metal container;
wherein interlocking the first metal container and the second metal container comprises
narrowing a top portion of the first metal container and a top portion of the second metal container; and
expanding the diameter X of a second portion of the first metal container and the diameter Y of a second portion of the second metal container prior to narrowing.
7. The method of claim 6 wherein the first metal container and/or the second metal container have ribs.
8. A method of manufacturing a metal double-walled container comprising:
providing a first metal container having a diameter X;
providing a second metal container having a diameter Y, wherein the diameter Y is larger than the diameter X;
inserting the first metal container into the second metal container; and
interlocking the first metal container and the second metal container so that a gap lies between a first portion of the first metal container and a first portion of the second metal container, wherein interlocking comprises:
inserting an expansion die into an open end of the first metal container so that the diameter X of a second portion of the first metal container expands; and
finishing a top edge of the first metal container so that the first metal container and the second metal container become interlocked wherein finishing comprises seaming and wherein a top edge of the second metal container is double-seamed as the top edge of the first metal container is double-seamed.
9. The method of claim 8 wherein the diameter Y of a third portion of the second metal container expands as the diameter X of the second portion of the first metal container is expanded.
10. The method of claim 8 wherein the first metal container and/or the second metal container have ribs.
11. A method of manufacturing a metal double-walled container comprising:
providing a first metal container having a diameter X;
providing a second metal container having a diameter Y, wherein the diameter Y is larger than the diameter X;
inserting the first metal container into the second metal container; and
interlocking the first metal container and the second metal container so that a gap lies between a first portion of the first metal container and a first portion of the second metal container, wherein interlocking comprises:
inserting an expansion die into an open end of the first metal container so that the diameter X of a second portion of the first metal container expands; and
finishing a top edge of the first metal container so that the first metal container and the second metal container become interlocked wherein finishing comprises curling and wherein a top edge of the second metal container is curled as the top edge of the first metal container is curled.
12. The method of claim 11 wherein the diameter Y of a third portion of the second metal container expands as the diameter X of the second portion of the first metal container is expanded.
13. The method of claim 11 wherein the first metal container and/or the second metal container have ribs.
14. A method of manufacturing a metal double-walled container comprising:
providing a first metal container having a diameter X;
providing a second metal container having a diameter Y, wherein the diameter Y is larger than the diameter X;
inserting the first metal container into the second metal container; and
interlocking the first metal container and the second metal container so that a gap lies between a first portion of the first metal container and a first portion of the second metal container, wherein interlocking comprises:
inserting an expansion die into an open end of the first metal container so that the diameter X of a second portion of the first metal container expands; and
narrowing the diameter Y of a second portion of the second metal container so that the first metal container and the second metal container become interlocked;
wherein inserting the expansion die occurs after inserting the first metal container into the second metal container and prior to narrowing the diameter Y of the second portion of the second metal container.
15. A method of manufacturing a metal double-walled container comprising:
providing a first metal container having a diameter X;
providing a second metal container having a diameter Y, wherein the diameter Y is larger than the diameter X;
inserting the first metal container into the second metal container; and
interlocking the first metal container and the second metal container so that a gap lies between a first portion of the first metal container and a first portion of the second metal container, wherein interlocking comprises:
inserting an expansion die into an open end of the first metal container so that the diameter X of a second portion of the first metal container expands; and
narrowing the diameter Y of a second portion of the second metal container so that the first metal container and the second metal container become interlocked;
wherein narrowing the diameter Y of the second portion of the second metal container occurs after inserting the first metal container into the second metal container and prior to inserting the expansion die.