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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. Door closers can be linked to a building's fire and security alarm systems. [2]
Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer.
Bolt – A (nearly always) metal shaft attached by cleats or a specific form of bracket, that slides into the jamb to fasten a door. [2]: 89 Draw bolt - A form of crossbar latch where a bolt, held in place by metal bails, is slid to engage a bail fixed to a jamb or mating door. A small, typically knob, handle is affixed to the bolt to aid grip.
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 December 2024. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including exterior doors of residential and commercial buildings, internal doors, cupboard ...
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Other engineers also left these companies to form their own manufacturing firms in electronic locking, including Highpower Security Products LLC in Meriden, Connecticut. Many other firms in both the US, Canada, and throughout Asia were later established to create additional product offerings for the direct-pull electromagnetic lock.
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