Who invented the modern behind closed doors?

We are talking about the door closers is the modern hydraulic door closer (referred to as behind closed doors), began in the early twentieth century, the United States registered a patent, it is different from the traditional door closers, through the door closer Of the liquid throttling to achieve the buffer effect.


In addition to closed-door behind closed doors what role?


The core of the hydraulic door closer is to realize the control of the door closing process, so that the various functions of the door closing process can be adjusted according to the needs of the people. The purpose of the door closer is not only to automatically close the door, but also to protect the door frame and door (smooth closed), more importantly, the door closer has become a modern building intelligent management can not be ignored part of the implementation.


Closers are mainly used in commercial and public buildings, but are also used at home. They have many uses, the most important of which is to make the door closed, to limit the spread of fire and building ventilation.



Choose door closers should be considered factors: the weight of the door, door width, door frequency and use requirements and use of the environment.


Door weight and the width of the door is to choose the most important factor behind closed door models, common door fire doors, wooden doors, aluminum doors, glass doors, steel doors and so on. Usually the weight of the door is small, on the choice of smaller power models, and vice versa.


Open-door frequency and product quality are closely related


1, requiring closed-door closures better, not oil, the key is sealed technology and materials;

2, requiring the door closer to a long life, so as to ensure the installation of long-term, normal use, reduce maintenance, update the workload and costs, but also feel behind closed doors products to bring convenience and enjoyment.


Use requirements include:


1. Whether the need to open the door after the automatic stop function;


2. Damping buffer function


And the damping buffer force and range can be adjusted according to the requirements of use; This function is used to prevent the door or the lock from hurting the wall quickly when the door is forced open or to prevent the person from opening the door in case of emergency escape when opening the door to a certain position Weightlessness and tilt down to the ground.


3. Delay slow closing


Door from the door to open the maximum position of the slow start slowly closed, according to the requirements of stepless adjustment. Suitable for frequent access to many places, especially the hospital, the elderly, children and disabled access to the door and channel use.


4. Closing force adjustable


Can be used in the door weight and door wide range of different doors installed, and due to environmental reasons, a large place to close resistance. Free stepless adjustment can be satisfied with the closing force, especially in coastal cities, travel and other wind affected by the resistance to change the place often closed.


5. Use the environment


Fire protection requirements and antifreeze requirements at locations below minus 35 ° in winter.


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