Fire escape elevator / elevator

With a sensor of temperature and smoke, the entrance of the elevator will be shut down on the identical floor in fire accident, and the system of elevator can now be regarded as one of the evacuation facilities. There are backup elevators folded on the top of the main elevator. With a deceleration device the most of the power supply is originated in gravity when the folding elevators move downward. When all the backup elevators finish the transporting and folded again on the main one, the main elevator will lift them all to the top of the system. To save time, the main elevator and the backup ones are designed to be operated at the same time.