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  2. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC, 24 VDC (common), 24 VAC, 120 VAC, or 240 VAC. The closed doors may or may not mechanically latch or lock in the closed position. Many fire doors do not lock, to allow building occupants ...

  3. Doorstop - Wikipedia

    en.wikipedia.org/wiki/Doorstop

    A doorstop (also door stopper, door stop or door wedge) is an object or device used to hold a door open or closed, or to prevent a door from opening too widely. The same word is used to refer to a thin slat built inside a door frame to prevent a door from swinging through when closed.

  4. You Might Be Using Your Door Stoppers Wrong: Here's How They ...

    www.aol.com/might-using-door-stoppers-wrong...

    As the videos point out, they can also prop a door wide open. In other words, stop it from closing shut, slightly or all the way—just like you might use a freestanding door stop for the same effect.

  5. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    These door holders were traditionally used to hold doors open, but in this application Saphirstein believed that they could be packaged and adapted to work as a fail-safe lock. After a successful prototype and installation at the Forum, Saphirstein continued evolving and improving the design and established the Locknetics company to develop ...

  6. The Invergordon Common Good Fund owns the bust, which was purchased in 1930 for about $6.35. Now, the historical bust could sell for $3.1 million.

  7. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    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]

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