Revolving doors are commonly found in hotels, airports, shopping malls, office buildings, commercial buildings and other entrance and exit systems. Their spacious and high-profile design creates a luxurious atmosphere, which is called the “finishing touch” of buildings. The invention of the revolving door enhances the wind resistance of the building, reduces the energy consumption of the air conditioner, and effectively prevents the airflow from bringing bad smell, sound, dust and dirt into the building, which is the best choice for isolating the airflow and saving energy. So how did the revolving door be invented?

          At the end of the 19th century, Sedupolis Vankandi finally found a security job at a hotel in Boston, saying that security is actually a doorman and is responsible for opening and closing the door every day. In an extremely cold winter, when he was standing at the door, he would open the door for a while and close the door. The heat and cold were uneven, and soon he got a bad cold and almost lost his life. After he was well, he resolutely quit his job. After working again, he was fortunate enough to apply to a bank as a lobby manager, whose main job was to guide clients. Unfortunately, it was not long before he got to work. The road in front of the bank began to work. The roar of the machine disturbed the distraction of his brother. What bothered him even more was: There were customers coming in and out, and I didn’t know how to close the door after opening the door. The noise and dust all came in. After a few days, Dino tried to resign.

          On this day, his brother Sedupolis? Vankanier came to see him, he is a manager of a door and window company in the United States. Dino disappointed to tell Neil about the situation here, and said to Neil: "Brother, you are doing the door and window business. Can you find a way to do a door as soon as possible? It can be kept open and kept closed. This will not happen.

          The speaker didn't mean it, the listener had the heart, and Neil immediately realized that it was a good opportunity to improve the doors and windows, and found the design idea "always open, always closed" in the unintentional words of the younger brother. Later, he changed the concept. , called "always open - always closed." This concept was immediately recognized by the company's top management. The company's board of directors immediately instructed Neil as the chief person in charge, set up a research and development team to start research, and first allocated $2 million in research start-up funds.

          Neil immediately invested in research, but after one year, his philosophy "always open - always closed" sounds very avant-garde and fashionable, but there is no reliable way to achieve it.

          One day, Neil took the children to the amusement park to play, the children had to enter the maze, Neil bought two tickets and the children rushed in. The rule here is that the entry must be found after entering. It’s really strange. They walked for a long time, they couldn’t find the way back. Under the guidance of the staff, they came out. This made him feel both novel and full of doubts. He proposed to look at the maze route. The staff is strictly not allowed. Just when they were in agreement, the person in charge of the labyrinth came. Coincidentally, the person in charge was the brother of Neil's colleague. With this relationship, Neil was quickly allowed to view the maze line, and he went to the second floor and looked down at the maze. The staff explained that the key part of the maze is in a round position in the middle. After all, he opened the lid of the round, and the organs inside were unobstructed. There is a shaft that can be freely rotated in the round bin. There are three horizontal bars on the shaft. This is to prevent people from getting in and more crowded. The bar is used to separate the visitors into three parts. After the visitors entered, the door closed and the person turned with the rotation of the bar. After a few turns, the other wall door of the round bar opened, because the walls of the round bar were all the same, and there was only weak and weak light inside. People think that this is the original door, they all go out from this door... but they don't know, they have come to another maze world from another door, and it is impossible to find the way back. Neil couldn’t help but smile, it seems that the mystery of the maze is on this round...

          On the way back, Neil eagerly told the child the mystery of the maze, but he spoke and said, he suddenly excited, "round warehouse, round warehouse..." made the door into a round warehouse, opening a mouth inside and outside, The crossbar inside becomes a door leaf, and the round bin is divided into several spaces. The person turns in the space, turns to the exit, and goes to the entrance to enter. Whether it is going out or entering the door, the round warehouse and the door are always between It was closed... Neil confidently broke through the technical problem of "always open - always closed", wrote the report overnight, and sketched a sketch, and gave it to the company manager the next day. The manager jumped excitedly after watching it. Up, I immediately organized the staff to design the door according to Neil's idea... After half a month, the world's first revolving door was born, and it really satisfied the technical requirements of "always open - always closed", for the world's doors and windows The history of development has opened a new page.

          Later, Neil registered a patent in the United States, and the registered trademark was: "Always open - always closed." Nowadays, hotels, shopping malls, banks, etc. are widely used in the world, and the production process is more and more elegant, and more and more beautiful. However, who knows that its invention is derived from a labyrinth?