Histroy in the United States, two subway trains in the Potomac River tunnel almost lead to disaster due to signal system problem. At that time Metro train driver noticed his vehicle was too close to the vehicle in front, but the subway signal system had told him in front was free spare, but fortunately the driver was not misled by the error signal, and took a brake. Washington Metro operations attributed the problem to communication cable failure. Another accident in 2009, Tottenham northeast of United States, near the subway station, the train 112 hit the tail of the train 214 who was stopping at the station. According to the Associated Press the train 112 was in automatic operation mode, mainly controlled by the computer system. Finally, the Washington Metro subway department replaced all the system by artificial of drivers to guard against computer failures.

So, like a security measure that is too important to completely rely on computer automation system. This dependence of automatic system is often the root causes of the accident. In the automatic door industry, especially the automatic revolving door, there are a lot of examples, in the year 2006, in a 5-star Hotel Ritz-Carlton hotel, a customer was crushed by the automatic revolving door, in the year 2009, Beijing Yongxing Garden Hotel, a luxury four-star hotel, a half-passed three-year-old boy was caught by the revolving door, then died in the arms of his father....

However, the world's leading brands such as automatic doors of Boon Edam, its prevention features of security including the anti-squeeze function, anti-strike function, the vertical safety switch etc. These features are relying on sensors to prevent the effect occurs, once sensors fails, the consequences would be disastrous. Based on our ideology of people-oriented, besides all other security measures, we have invented the Instant reaction function. It is a physical security device with a torque control installed in the three and four wings automatic revolving door. When the door meets a resistance greater than the set value, the door will stop rotating. Torque control is mainly based on friction force's principle, and therefore all security systems are failure, it is still able to work properly. In this ways, TSTC automatic revolving door offers to person a last effective for life support .