NationMaster - Encyclopedia: Door closer

A door closer is a mechanical device that closes a door, in general after someone opens it, or after it was automatically opened. There are two general styles of door closers: manual and automatic. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Wind turbines The scientific definition of a machine is any device that transmits or modifies energy. ... Look up Door in Wiktionary, the free dictionary. ...

A manual door closer will close a door after it has been opened by hand. To limit the door's speed, common door closers have a hydraulic (oil-filled) damper. The speed may be adjustable by up to two set screws near the door's hinge end of the closer (Do not fully remove these screws because oil may leak out). A spring-type door closer usually shuts the door very quickly, banging the door shut. This type of closer would be used on a swing door. Look up Door in Wiktionary, the free dictionary. ...

An automatic door closer (more often called door opener) opens the door itself, typically under the control of a push button, motion detector or other device, and then closes it as well, typically employing a motion or proximity detector to determine when it is safe to close the door. A garage door opener is a motorized device that opens and closes garage doors. ... Buttons on a handheld calculator. ... A Motion Detector is a device connected to a burglar alarm that is used to detect motion. ... This article does not cite any references or sources. ...

A leading manufacturer of door closers is LCN, founded by Lewis C. Norton, the first person to make a door closer. His first design was made in 1877, some of which are still in use today. Some professionals have joked that LCN stands for "Last Closer Needed." Ingersoll-Rand NYSE: IR is a diversified industrial firm founded in 1871. ... 1877 (MDCCCLXXVII) was a common year starting on Monday (see link for calendar). ...

Leading European manufacturers include Briton part of Ingersoll Rand Security Technologies, DORMA and GEZE GmbH. Ingersoll-Rand NYSE: IR is a diversified industrial firm founded in 1871. ...

Categories: Doors | Automation | Technology stubs

Results from FactBites:

Norton Series 7500 Door Closer (Norton Door Control) (656 words)
	The Series 7500 door closer has been tested and is certified by an independent testing laboratory as being in compliance with the Grade 1 requirements of ANSI Standard A156.4.
	Closer shall be enclosed in a (molded cover) (metal cover plated with a Norton finish) (metal cover laminated with an unfinished wood grain).
	All door closers listed in this catalog section are intended for use in conjuction with a separate door stop doors hung on anti-friction type hinges or pivots and installed on the interior of the building/facility.

Door Closer FAQ (1567 words)
	Door closers are mainly used in commercial and public buildings but may also be used around the home where circumstances make their use desirable.
	Some types of door closers can vary their strength number by altering the position of the closer on the door by means of moving it along a bracket.
	This type is known as the Perko door closer and there is a hydraulic version known as the Perkomatic which offers better control of the closing speed and latch action (the force required to overcome the door latch).

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