Automatic emergency sliding exit doors - have bolt opening actuators switching to emergency current or moving all door wings if both currents fail

摘要

The sliding door is for public buildings, and has two normally bolted outer doors, swung outwards in emergency by trunnions. Two electrically operated sliding wings are similarly moved in emergency. An emergency opening system switches onto emergency current supply in the event of current failure, to move the sliding wings from any position into the open one. As these move, it releases the outer door wing bolts. In the event of both currents failing, the system permits all wings to swing out of their position.