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  2. Door furniture - Wikipedia

    en.wikipedia.org/wiki/Door_furniture

    Numerous devices exist to serve specific purposes related to how a door should (or should not) be used. See: Door chain - A device to secure door opening; Door closer – Mechanical or electromagnetic device to close an open door (in the event of a fire) [3] Door opener - Automatic door opening device activated by motion sensors or pressure pads

  3. Locksmithing - Wikipedia

    en.wikipedia.org/wiki/Locksmithing

    The majority of locksmiths also work on any existing door hardware, not just locking mechanisms. This includes door closers, door hinges, electric strikes, frame repairs and other door hardware. Full disclosure

  4. Revolute joint - Wikipedia

    en.wikipedia.org/wiki/Revolute_joint

    A revolute joint (also called pin joint or hinge joint) is a one-degree-of-freedom kinematic pair used frequently in mechanisms and machines. [1] The joint constrains the motion of two bodies to pure rotation along a common axis. The joint does not allow translation, or sliding linear motion, a constraint not shown in the diagram. Almost all ...

  5. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    A bifold door is a unit that has several sections, folding in pairs. Wood is the most common material, and doors may also be metal or glass. Bifolds are most commonly made for closets, but may also be used as units between rooms. Bi-fold doors are essentially now doors that let the outside in.

  6. Door security - Wikipedia

    en.wikipedia.org/wiki/Door_security

    Door chains — allows the doors to be opened slightly to view outside while still remaining locked. Secondary, internal locks — sliding bolts, hooks and speciality latches, metal blocks or bars mounted internally. Hinge screws — longer or specialized screws that prevent the door from being simply pulled out after removing the hinge pins.

  7. File:Hingebifold.JPG - Wikipedia

    en.wikipedia.org/wiki/File:Hingebifold.JPG

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