Door locking mechanism operation during fire outbreak - has actuator operating above predetermined temperature thrusting locking member into engagement

摘要

The locking mechanism between two components is partic. for use between a hinging door and a frame. A locking member (7) works with an actuator (8) which becomes active above a predetermined temperature, thrusting it from the released into the engaged position. The actuator can be formed by a quantity of material expanding with a temperature increase, acting against the member. Alternatively it can be pre-loaded and held by a retaining device releasing it with temperature increase.