Types [ edit ] Manual [ edit ] Older manual door closer (made by BKS) Friction-based mechanical speed control mechanism

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https://www.britishnewspaperarchive.co.uk/viewer/bl/0002135/19741126/039/0003– via British Newspaper Archive. {{ cite news}}: Missing or empty |title= ( help) Finally, because pneumatic openers use air instead of electronics, they can be employed in hazardous situations. Unlike electrical actuators there is no high-voltage wiring at the door frame, and the control box, which contains the electrical timing circuits, can be remotely located outside the hazardous area.When door closers are mounted in the header they are known as transom closers. [33] These can be HO (hold open) or NHO (none hold open). The shoe door closer, known as a heel spring, [35] is housed entirely in the 'heel' of the door, inside a shoe. This shoe looks very much like the shoe used in conjunction with floor springs.

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Great Britain Patent Office (1873). Patents for inventions: abridgments of specifications relating to hinges, hinge joints, and door springs. A.D. 1775-1866. George E. Eyre and William Spottiswoode. p.111. OCLC 54199007. Automatic Access are always able to find the perfect pneumatic door opener for the job in hand, and in particular find openers for more challenging environments and purposes. The energy used in opening the door is stored in a spring (compression, torsion, tension, volute or leaf), [25] and released to close the door. Spring tension is typically adjustable, altering both opening and closing force. Most door closers use oil-filled hydraulic dampers to limit closing speed, and allow for soft closing. Other types use a friction-based mechanical speed control mechanism. [26] This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.

Q&A

A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Controlled closers” use adjustable hydraulic valves to variously regulate the door’s opening and closing speed, latch speed, and delayed action return. These allow setting of the “sweep speed” (the rate which the door travels along the majority of its closure, the sole closing setting on basic closers); the “latch speed” (the rate in the last 10 to 15 degrees of closing arc, allowing it to be set faster than the "sweep" to ensure proper latch closure); “delayed action” (which slows sweep speed dramatically for roughly the first half of its range, allowing more time for passage), [27] and opening speed (preventing a door from being opened too fast, a useful feature in crowded environments, and those where the young, old, or infirm may be present). It is also particularly well-suited to exterior doors where there is a danger of wind catching and blowing them open, potentially harming the door, nearby objects, people, or pets. Firstly, they can be used in buildings where the need for a low energy design is important. This is because with pneumatic doors openers, safety sensors are not always required. Since the pneumatic automatic operators are powered by pressurized air, they are quiet, efficient, and very reliable. electromagnetic device. [28] The latter include retina scanners, fingerprint readers, and voice recognition technologies. [29] Electric door closers may also be hooked to a building’s fire alarm system. A triggered alarm cuts power to any electromagnetic hold-open device, allowing the doors to close. [30] Configurations [ edit ] A concealed jamb-mounted door closer