| 摘要 |
<p>There is described a fire-break door comprising a swivelling leaf provided with at least one lock with draw-bolt which can be controlled by an operating member, said leaf cooperating with a door-closer allowing to swing said leaf back automatically to the closed position thereof, in which means are provided on the one hand to retain the lock bolt in a recessed or withdrawn position when the door leaf lies in closed position, and on the other hand to let the bolt be released and enter the keeper of the lock with an abnormal rise in the temperature adjacent the door.</p> |
