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US 2025/0026526 A1Published application
Bottomed metal cylinder
AssigneeToyo Seikan Co., Ltd.
InventorsKota KAMIYAMA, Tomohiko Nakamura
Life of this patent
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Abstract
A bottomed metal cylinder includes, at a bottom portion, a ground contact portion, a rising portion extending upward from an inner side of the ground contact portion, and a dome-shaped bottom surface extending to the rising portion. An annular line originating from a local thin portion is observed at a peripheral edge portion of the dome-shaped bottom surface.
Claims4
A bottomed metal cylinder comprising, at a bottom portion:
- a ground contact portion;
- a rising portion extending upward from an inner side of the ground contact portion;
- and
- a dome-shaped bottom surface extending to the rising portion, wherein
- an annular line is observed at a peripheral edge portion of the dome-shaped bottom surface.
2 more elements
A molding die used for dome-molding a bottom portion of a bottomed metal cylinder, the molding die comprising:
- an annular holding die for holding a bottom portion peripheral edge of the bottomed metal cylinder;
- and
- a doming die for defining a dome-shaped bottom surface, wherein
- the doming die is divided into
- a doming ring for defining a peripheral edge portion of the dome-shaped bottom surface, and
- a base die for defining a center portion of the dome-shaped bottom surface inward of the peripheral edge portion, and
- the doming ring and the base die are each independently vertically movable.
4 more elements
Dependencies are inferred from the claim text.