Revolving door. History of invention and production

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HISTORY OF TECHNOLOGY, TECHNOLOGY, OBJECTS AROUND US
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Revolving door. History of invention and production

The history of technology, technology, objects around us

Directory / The history of technology, technology, objects around us

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Revolving door - a design of, as a rule, three or four doors, mounted on a central shaft and rotating along a vertical axis.

Revolving doors help keep the building at an optimal temperature by preventing the room temperature from rising or falling, while maintaining high throughput.

The first revolving door was created by the Berlin-based German inventor Bonhacker, who patented the concept on December 22, 1881; in the documents it was called "Tur ohne Luftzug" - "door without draft".

Revolving door
Blueprint "Tur ohne Luftzug"

The end of the nineteenth century changed the face of cities. Advances in the production of steel, glass and reinforced concrete led to the fact that buildings began to quickly climb up, giving rise to a new class of buildings. It is believed that progress was greatly facilitated by the invention of the elevator brake, which made elevators safe and thereby removed restrictions on sports training for visitors and residents of skyscrapers. But almost everyone forgets about the invention, which both figuratively and literally opened the door to high-rise construction. The fact is that visitors to the first skyscrapers faced one unpleasant, but, it seemed, completely inevitable physical effect.

Any high-rise building, riddled from top to bottom with stairwells, ventilation and elevator shafts, is potentially a giant chimney. Due to the pressure difference below and above, a powerful draft was created in the building, which, when the entrance doors were opened, generated not just drafts, but real gusts of wind. By the way, sometimes even opening the door was not easy - the air flow tried to slam it shut, overpowering the incoming one.

This is where Theophilus Van Kannel, a 47-year-old inventor from Philadelphia, entered the scene. It is not known what the inspiration was, but on August 7, 1888, he received U.S. patent number 387571 for the invention "outer door design". In fairness, it must be said that Van Kannel did not create his invention from scratch, but significantly improved the version of an earlier design by the German inventor Bockhacker.

Van Kannel's system was a revolving door that always blocked the opening and did not give any chance for drafts, wind, rain, and even street noise to enter the room along with incoming visitors. The door also cleverly separated the streams of people who enter and leave the building, and made it possible to do this at the same time. And, besides, the architects really liked the revolving door: it made it possible to feel the grandeur of the building's structure and decoration of the lobby.

Revolving door

A year after receiving the patent, Van Kannel received the prestigious John Scott Medal from the Franklin Institute in Philadelphia and founded the Van Kannel Revolving Door Company (later, after a series of reorganizations, the International Revolving Door Company). The first revolving door was installed in 1899 at the Rector's restaurant in Times Square, New York. And since then, thousands of such doors with the motto Always Open, Always Closed (“Always open, always closed”) stand guard over buildings, preventing wind, rain and snow from entering.

True, evil tongues say that Van Kannel was not at all a brilliant inventor, but simply hated opening the door in front of a woman and letting her go ahead - so he had to come up with a design that makes the one who enters first work. But this, of course, is nothing more than a rumor.

Author: S.Apresov

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