| 摘要 |
<p>Trigger mechanism for a fire damper of ventilation ducting, which fire damper comprises a duct part, in which is installed a flap in a hinged manner, which has both an open position and a closing position, and which flap is arranged to be turnable from outside the fire damper with a handle (1), which in the open position of the fire damper is spring-loaded in such a way that the spring force tries to close the flap, and which trigger mechanism comprises a trigger (2'), which in a normal situation prevents the flap from closing, and which trigger mechanism comprises a thermal fuse (4), which above a certain temperature trips releasing the trigger (2), which trigger comprises a counterpart (2"), which when the handle (1) is in the position in which the flap of the fire damper is open is settled against the handle preventing it from moving. The invention is implemented in such a way that the trigger (2) is arranged to be turnable, which turning the thermal fuse (4) is installed to resist.</p> |
