Rotating door: advantages, device and subtleties of design
At the end of XIX in. The development of the architecture of skyscrapers built from reinforced concrete and glass received. However, the first residents and visitors of these buildings were faced with the fact that, due to the difference in pressure at the top and below the building, during the opening of the front door, a powerful air thrust was created, which gave rise to strong drafts and gusts of wind inside the construction. Often the air flow did not allow the door to open – she sought to slam, overpowering a person entering the room.
The American inventor Theophylus van Cannel, who patented the “external door” in August 1888, which was an improved model of a wooden “storm” door of a German engineer of the boxer in August.
The new invention was a door that was constantly overlapping and rotating around its axis, which did not give the wind, rain, draft and street noise into the room, along with an incoming person. In addition, she bred two streams of people at the same time – coming and leaving the high -rise building.
The design of the door also liked the architects, as it allowed the magnificent construction of the skyscraper and the interior decoration of the lobby. For this invention, the Franklin Institute of Philadelphia honored Wang Cannel Medals John Scott, which allowed the engineer to create his own door production company.