Who invented the revolving door?

In Italy in the 1920s, several kinds of double-wing doors were made. At that time, the double-wing door was designed to swing in two directions. Later, a Swedish revolving door manufacturer introduced a new double-wing door. They added a motor and a booth to the original design. There were also three-wing doors and four-wing doors. Three-wing revolving doors are very common in airports and hotels. Smaller doors are suitable for hand luggage to pass through, and revolving doors with a diameter of 4.2~5.4m are more convenient for luggage carts to enter and exit. Four-wing doors are more efficient and the throughput of people coming and going is greater. When a four-wing revolving door with a diameter of 2m rotates at the speed of 10r/min, people can pass in both directions at normal walking speed 10x4x 60 = 2400 (people). Four-wing revolving doors are widely used in office buildings and hotels. Five-wing door has not been developed so far, and there is still no market.

Shielded revolving door (1 1 sheet)

The original patent put forward two special designs: one is that the door body can move sideways; The other is the "explosive" ring power. These designs were popular before folding doors became popular today. The combination of the movable door and the folding door on the side of the door increases the through opening of the revolving door by nearly 50%. In order to ensure that the revolving door can still be used as a fast passage in and out of the building when there is a fire in the building, and to ensure that people can escape from the building in a dangerous situation, the doors of the revolving door are designed to be foldable, so that when each individual door is pressed, it can be loosened or rotated by an angle in the opposite direction of rotation, thus forming a passage. Many countries or regions in the world have incorporated this performance requirement into safety regulations.

In the 1940s, the revolving door was added with speed control, so that the speed of the door was controlled as required. With the development of industrialization and automation, on the basis of the original manual four-wing door series, various automatic revolving doors, revolving doors with card reading and identification safety performance, automatic doors with various safety protection sensors and many special revolving doors have been added, which has made them develop continuously and led to automatic revolving doors.

The development of automatic doors is not only because of its noise and dust-proof performance, but also because of its energy-saving characteristics. The American Society of Heating, Refrigeration and Air Conditioning Engineers conducted a study in the United States, and concluded that the revolving door entrance is the most economical and effective building entrance. For an ordinary revolving door with a diameter of 2m and a height of 2. 1m, each revolving door only drives 1.7 cubic meters of air. Because of the small heat exchange capacity of air, the revolving door has good energy-saving performance.