| 摘要 |
PROBLEM TO BE SOLVED: To provide a cover body of which the pour port can be unsealed easily and reliably. SOLUTION: In the cover body, a frame fixedly attached to a hole of a container is fixed to a handle through a helical hinge, while the handle is rotatably supported on the top wall of the container. When the container is unsealed, the helical hinge is expanded in association with the rotation of the handle, whereupon the frame is rotated by the torque caused by the helical form of the helical hinge, and hence the hole can be automatically broken. |
