Patent ID: 11878832
Assignee: DAIWA CAN COMPANY
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 5:
6. A manufacturing apparatus of a bottle-shaped can with a cap, comprising:
a neck portion on which a thread is formed, and on which the cap is mounted; and
a curled portion formed on an upper end portion of the neck portion, to which a sealing member affixed to an inner surface of the cap is contacted tightly to seal the neck portion,
wherein the curled portion has a top section including a leading end section as an upper end of the neck portion, a diametrically-largest section formed beneath the leading end section in which an outer diameter is largest, a diametrically-shrunk section extending downwardly from the diametrically-largest section in which an outer diameter is reduced gradually, and an outer circumferential wall section extending downwardly from the diametrically-shrunk section,
wherein:
the manufacturing apparatus comprises a forming tool that pushes a cylindrical folded portion bent outwardly from the neck portion toward an outer circumferential surface of the neck portion to form the curled portion,
the forming tool includes an inner tool that is inserted into the neck portion to maintain a shape of the neck portion from inside, and an outer tool that pushes the folded portion toward the neck portion from radially outer side,
the inner tool includes a shaft portion which is inserted into the neck portion, and an annular flat portion to which a leading end of the folded portion formed on the neck portion is contacted,
the outer tool includes a projection that is isolated from the annular flat portion at a distance wider than a length between the leading end section and the diametrically-largest section in a direction along a center axis of the neck portion, and that pushes the folded portion toward the neck portion from radially outer side, and
the neck portion engaged with the inner tool is rotated along the outer tool to form the curled portion.