Edogawa Kezhuang? 2018-01-22
emmm... The reason why I write this is because I went to the North Branch of the library to read a book last night and passed through the revolving door when I entered. At that time, I suddenly thought that the revolving door is really a very scientific invention, and I was curious who originally designed this thing? So I came back to find some information and share it with everyone.
That’s it! The door of Li Wenzheng Hall!
The revolving door should be an object that everyone often sees in daily life. Many public spaces have doors designed like this. The door panels of revolving doors are usually called wings or leaves. There are usually three or four, and most of the ones I have seen look like three. It looks like this when viewed from the top:
The picture comes from wiki
The reason why it is a very scientific thing is that it can be seen from the picture above that the two parts separated by the revolving door The two spaces will never be connected, but people can pass in two directions and enter from one space to another. This design can avoid air flow exchange when opening and closing the door, so there will be no wind and can keep the indoor temperature from being affected by the outside temperature and weather.
For revolving doors that need to be pushed by people, there is usually a controller to ensure a maximum speed for safety. For automatic, both speed and rotation direction are controlled. For places where people drive on the right side, such as ours, they will turn counterclockwise to facilitate people entering from the right, and vice versa when driving on the left.
In addition to maintaining the indoor environment, revolving doors also have other functions. For example, when the space of each cubicle is small enough, people can enter one by one to avoid tailgating. And unlike ordinary sliding doors, the people who want to enter and the people who want to go out do not affect each other, which avoids the embarrassment of who enters first when there are people on both sides at the same time, and also avoids the crowding of people entering and exiting at the same time when there are a lot of people. traffic efficiency.
In addition, if only one direction of rotation is allowed, it can be turned into a one-way traffic controller, such as the very common Fried Chicken turnstile below. It is a variation of the revolving door.
Still from wiki
According to different mission needs, there are many variants. For example, there is a paragraph in the anime death note, where Soichiro Yagami exchanges notes for hostages, that is, he When his daughter Sayu Yagami was born, in order to ensure that the transactions between the two hostile parties did not go wrong, they used bulletproof glass to make such a mechanism:
alties was the single revolving door located at the entrance. As the mob of panicking patrons attempted to use the door as an escape it soon became jammed, trapping countless people between the door and the crowd
So it can be seen that this design is very safe. (of course this refers to the security between people). For natural disaster safety, you can search ? Cocoanut Grove fire ? Cocoanut Grove is a nightclub in Boston where a massive fire broke out in November 1942, killing 492 people. An important reason is that there is only one revolving door at the entrance, and people are so panicked that the revolving door becomes an obstacle to escape. Since then, ordinary hinged doors have generally been installed next to revolving doors to allow more people to escape in emergency situations.
The first person to invent the prototype of the revolving door was H. Bockhacker, a Berliner, Germany. His patent was called: Tür ohne Luftzug? (1881).
Luft is air, and Luftzug specifically refers to ventilation. His patent and design drawings are as follows:
The one he designed can be rotated, so when people open the door and go in, they will be turned to the side going out. This avoids drafts when opening and closing doors. Later, in 1888, Theophilus Van Kannel applied for a patent called "Storm-Door Structure". His revolving door was basically the same as what we see now:
It was a three-wing revolving door. It is said that he invented this thing because he hated opening the door for others and then saying "Please first~", especially to ladies, he just wanted to open the door and go out quickly. Of course this is just a gossip story made up by everyone, hahaha. But we still have to thank him for bringing us such an interesting and practical invention.