This technique to hang doors may have originated with gates because of the need for them to remain closed once traffic has passed through. Before any mechanical devices were attached to doors to close them, the way in which the door was hung automatically closed the door once opened. Gravity alone may be considered to be the first "door closer". The brass decor plate and shoe are removed to show the internal workings. Early history Single action floor spring with pneumatic check. These hold-open devices can be separate from the door closer or part of its design. When the fire alarm is triggered it cuts power to the electromagnetic hold-open device allowing the doors to close. Where doors need to be held open for the majority of the time they are held back with an electromagnetic device. Door closers can be linked to a building's fire alarm system. The force used to open the door is stored in some type of spring and when released this energy is then used to return the door to a closed position.
SELF DOOR CLOSER MANUAL
Modern manual door closer Eclipse door spring and separate checking mechanismĪ door closer is defined as any mechanical device that closes a door in a controlled manner, preventing it from slamming, in general after someone opens it, or after it was automatically opened.
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