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  2. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Another type of surface mounted door closer is attached to the door frame behind the door (where the hinges are) next to the middle hinge. The "arm" (tail) rests against the door, and a spring that is twisted by the user opening the door closes the door by returning to its pre-twisted shape.

  3. Electric strike - Wikipedia

    en.wikipedia.org/wiki/Electric_strike

    This is exactly the same principle as a child safety door lock which is installed on car doors. Electric strikes on AC may allow someone outside the door to hear when the door is unlocked. A buzzing noise is typically made by applying alternating current (AC) to the strike instead of direct current (DC). When using a DC powered strike, the ...

  4. Surface-mount technology - Wikipedia

    en.wikipedia.org/wiki/Surface-mount_technology

    Surface-mount technology (SMT), originally called planar mounting, [1] is a method in which the electrical components are mounted directly onto the surface of a printed circuit board (PCB). [2] An electrical component mounted in this manner is referred to as a surface-mount device ( SMD ).

  5. Door furniture - Wikipedia

    en.wikipedia.org/wiki/Door_furniture

    Door stop – used to prevent the door from opening too far or striking another object [3] Espagnolette (for a window) Fingerplate; Letter box or mail slot; Peephole; Kickplate [5] A number of items normally accompany doors but are not necessarily mounted on the door itself, such as doorbells.

  6. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    Filler plates are also used to provide a large, flat mounting area on the door frame when the electromagnet is larger than the available mounting space on the door frame due to the frame's geometry. The magnetic lock should always be installed on the secure side of the door. Most installations are surface mounted.

  7. Door handle - Wikipedia

    en.wikipedia.org/wiki/Door_handle

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. 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 ...