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