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  2. Door chain - Wikipedia

    en.wikipedia.org/wiki/Door_chain

    Security screen doors add a second set of hinges or locks to defeat before access to a structure can be granted. If the intention is to keep thieves out, or keep disturbed individuals in, this is a better solution. Security screen doors also make it possible to open the main door, and communicate with those outside. Some even have mail slots.

  3. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Earlier still is reference by way of a letter between Sir Edward Filmer (3rd Bart.) and his brother, Beversham Filmer dated 1748, in which they discuss a door spring. [13] Whilst not a door closer, there was a mechanical statue, reported in the Stamford Gazette and displayed by a Monsieur Delanois at the White Swan in Stamford, December 21 ...

  4. Rim lock - Wikipedia

    en.wikipedia.org/wiki/Rim_lock

    An antique rim lock installed on a door. A rim lock is a locking device that attaches to the surface of a door. [1] It is the oldest type of lock used in the United Kingdom and Ireland. It is of a basic design using (usually) a single lever and a sliding bolt. Wards can be used for additional security. They are not used where high security is ...

  5. Screen-door effect - Wikipedia

    en.wikipedia.org/wiki/Screen-door_effect

    The screen-door effect (SDE) is a visual artifact of displays, where the fine lines separating pixels (or subpixels) become visible in the displayed image. This effect can be seen in digital projector images and regular displays under magnification or at close range, but the increases in display resolutions have made this much less significant.

  6. AOL Shield Pro: Troubleshooting - AOL Help

    help.aol.com/articles/aol-shield-troubleshooting

    While watching a video in full-screen mode, the simplest way to remove the Anti-Keylogging bar is to move your pointer on top of the bar and it will go away. 2. You can go into Settings, and under Appearance, uncheck the box next 'Show enhanced security scrambler window.' (access Settings by clicking the menu button in the upper right - the ...

  7. Crash bar - Wikipedia

    en.wikipedia.org/wiki/Crash_bar

    Crash bars offer several configurations for latching to the door frame. Vertical rods can be affixed to crash bars allowing both doors to be opened with no center clearance obstruction. When the bar is depressed, a chord within the vertical rod gets pulled, which lowers a latch at the top and/or bottom and allows the door to open.

  8. Fail-safe - Wikipedia

    en.wikipedia.org/wiki/Fail-safe

    In case of fire, the link melts and releases the doors, and they close. Some airport baggage carts require that the person hold down a given cart's handbrake switch at all times; if the handbrake switch is released, the brake will activate, and assuming that all other portions of the braking system are working properly, the cart will stop. The ...

  9. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    The hinge of the operating door is next to the adjacent fixed door and the latch is located at the wall opening jamb rather than between the two doors or with the use of an espagnolette bolt. A Lev door or convection door is an internal floor-to-ceiling (full height) door, consisting of a standard door leaf and an upper leaf in place of the ...