| 摘要 |
PROBLEM TO BE SOLVED: To provide a lock release mechanism of a fire door which has a simple structure and high versatility and facilitates coping with other engaging and locking mechanisms.SOLUTION: A drive shaft 110a of a solenoid 110 is pushed inside from a projected state by switching electric current application in the case of fire, whereby a slide lever 130 is moved to the right side to rotate a trigger lever 100 counterclockwise to move a release lever 91 to the right side. A stop piece 70 of an engaging and locking mechanism part is operated in a predetermined direction by the release lever 91, whereby a lock state of a fire door is released and switched to a relock prevention state. An operating lever 150 is pushed in from the relock prevention state, whereby the slide lever 130 is returned to the left side, the drive shaft 110a of the solenoid 110 is held in a state projected to one end side, and the slide lever 130 stops at the original position, and whereby the release lever 91 is also returned to the left side and engaged with the trigger lever 100 to return to a relockable initial state. |
