| 摘要 |
PROBLEM TO BE SOLVED: To provide a closing device capable of returning an opening-closing body of executing closing operation to a standby state by simple operation, without requiring to separately prepare a tool.SOLUTION: In a standby state, a support arm 21 of a closing control part 18 projects, and supports a locking piece of an opening-closing body, and checks descent by dead weight of the opening-closing body. In an emergency, the closing control part 18 retracts the support arm 21, and support of the locking piece by the support arm 21 is released, and the opening-closing body 11 closes an opening part by descending by the dead weight. An emergency state is released, and when returning to the standby state, a return plate 35 is slid after lifting and storing the opening-closing body. One end of the return plate 35 is fitted to a projection part 22 of the support arm 21, and the return plate 35 also curves in response to rotation of the support arm 21, and acts so as to thrust up the projection part 22. The support arm 21 projects, and becomes the standby state by supporting the opening-closing body 11. |
