Something about the revolving door
2010-02-24

                                                                                                             Something about the revolving door 

 In today’s life, we usually see a very special door which can several people enter in. That is the revolving door. A revolving door typically consists of three or four doors that hang on a center shaft and rotate around a vertical axis within a round enclosure. Revolving doors are energy efficient by eliminating drafts, thus reducing the heating or cooling required for the building. At the same time, revolving doors allow large numbers of people to pass in and out. Around the center shaft of the revolving door, there are usually three or four doors called "wings" or "leaves". Large diameter revolving doors can accommodate strollers and luggage racks. The tallest revolving door currently is about 16 feet (4.9 m) high with 4 wings. So Revolving doors are also often seen as a mark of prestige and glamour for a building and its architecture. 

The revolving door existed in last century. Early in 1889, the Franklin Institute of Philadelphia awarded the "John Scott Legacy Medal" to Van Kannel for his contribution to society. In 1899, the world’s first wooden revolving door was installed at Rector’s, a restaurant on Times Square in Manhattan, located on Broadway between West 43rd and 44th Streets.  

 Certainly it has many advantages different from other doors. It possesses numerous advantages over a hinged-door structure, and is perfectly noiseless effectually prevents the entrance of wind, snow, rain or dust. Moreover, the door cannot be blown open by the wind. There is no possibility of collision, and yet persons can pass both in and out at the same time. Then we see it more specifically.

The glass doors allow people to see and anticipate each other while walking through. Manual revolving doors rotate with push bars causing all wings to rotate. Revolving doors typically have a "speed control" to prevent people from spinning the doors too fast. Automatic revolving doors are powered above/below the central shaft, or along the perimeter. Automatic revolving doors have safety sensors. So it can be used in many places.

 First Skyscrapers have required revolving doors because the sudden volume of rushing air can be so great as to blow out windows. Modern versions permit the individual doors of the assembly to be unlocked from the central shaft to permit free flowing traffic in both directions. The revolving door is always closed, so wind and drafts cannot blow into the building, also efficiently minimizing heating and air conditioning. Revolving doors can also be used as security devices to restrict entry to a single person at a time if the spacing between the doors is small enough. This is in contrast to a normal door which allows a second person to easily "tailgate" an authorized person. Extreme security can require bullet-proof glass.  

 As the development of doors, the revolving doors become energy saving today. It stops conditioned air from moving freely. An open swing door is like letting go of a balloon- the air rushes out of the opening. A revolving door is never open- seals remain in contact with the walls of the door at all times. Only the air in the chamber with the person going through the door is transferred. Given that the return on guard costs is the largest savings, one also needs to consider the energy-saving advantages, added prestige and the subtle, "non-visible" security of revolving doors. Then we should see the kinds of this door. It usually divided into three types-- Security Revolving Doors, Automatic Revolving Doors, and Manual Revolving Doors. They do have different handcraft. Above is some information.  

 Security Revolving Doors - Designed for access control purposes, the Phoenix line of revolving doors are implemented to provide control to environments that require access control from personnel or non-faculty from breaching corporate and government facilities. For the highest level of access control, the Phoenix line of four-wing revolving doors and three-wing one-way security revolving doors can provide unmatched access to your facility by one at a time access control to validated users only. Designed for pedestrian access control, the Phoenix revolving door is the safest, most secure revolving door available today.           

Automatic Revolving Doors - The Jupiter, Titan and Saturn lines of revolving doors are designed by International’s engineers using today’s most advanced technology. Designed for safety with spacious elegance in mind, our revolving doors utilize state-of-the-art sensor and drive technology to provide the world’s safest revolving door entrance systems.  

Manual Revolving Doors -The Saturn series of revolving doors by International are found in many unique places around the world. Our revolving doors can be found in nearly every large air-supported dome, in coal mine shafts 3,000 feet below the earth’s surface, within virtually all US nuclear submarines and battleships, and in most major high rise buildings. Revolving doors by International are designed to provide years of high throughput use with low maintenance. Our Comet style doors are designed to provide an all glass entrance to provide an elegant appearance.

Given increased awareness of security problems such as terrorism, espionage and theft, businesses today have become more security conscious. And the revolving door does it well. Regardless of how sophisticated the verification process is, once the swinging door or sliding door receives the signal to open, control of the number of people coming in and leaving is lost. A relatively recent but proven approach to controlled access combines the established environmental and aesthetic benefits of revolving doors with a verification device that controls access into the building. Security revolving doors offer several advantages over conventional entrances and turnstiles. One significant advantage is that revolving doors can be used in two directions simultaneously instead of allowing passage in a single direction at a time.  

We also don’t think it very hard. Most revolving door systems are very simple. Once the door receives a valid signal from the verification system, the user will step on a mat or the door will begin to turn. Sliding doors, swinging doors and turnstiles can only indicate that the entry system was moved or rotated. The revolving door, however, is the only system that sends a "handshake" signal to the verification system stating whether or not a person entered through the door. 

 In a word, when coupled with applicable security, a revolving door is most practical in verifying passage through the door and preventing unauthorized entry, as compared to a manual door that is non-secure until it relocks. So I think the revolving door will be used more widely in the future. People like its security, distance less, and energy saving.