| 摘要 |
A mechanism for opening and closing an opening portion is disclosed. The mechanism can simply and reliably open and close the opening portion without requiring a spring but using a simple mechanism and can stably maintain the closed state of the opening portion. When the opening portion is closed by a lid, with the head end side of the opening and closing member being protruded from the opening portion, the head end of the opening and closing member makes contact with the surface of the lid which faces the inner side of the opening portion, causing the lid to rotate about one end thereof which is rotatably supported by a rotation supporting shaft. This changes the state of the opening portion from the closed state to the opened state. When the head of the opening and closing member retracts into the opening portion from the state in which the opening and closing member is protruded from the opening portion, the protrusion of the opening and closing member will be made to engage the head end of a wound section of the lid, causing the lid to rotate about the one end of thereof which is rotatably supported by the rotation supporting shaft. This changes the state of the opening portion from the opened state to the closed state. |
