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  2. Door chain - Wikipedia

    en.wikipedia.org/wiki/Door_chain

    Installation can also be difficult, as the doorknobs of the two doors may interfere with each other, and the screen material usually interferes with any peephole devices on the door. swing bar lock. A door security restrictor, aka a door swing bar lock, is a newer device intended to replace door chains. It consists of a U-shaped bar that ...

  3. Wafer tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Wafer_tumbler_lock

    Wafer tumbler lock. A wafer tumbler lock is a type of lock that uses a set of flat wafers to prevent the lock from opening unless the correct key is inserted. This type of lock is similar to the pin tumbler lock and works on a similar principle. However, unlike the pin tumbler lock, where each pin consists of two or more pieces, each wafer in ...

  4. Crash bar - Wikipedia

    en.wikipedia.org/wiki/Crash_bar

    Crash bar. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.

  5. Three-point locking - Wikipedia

    en.wikipedia.org/wiki/Three-point_locking

    Three-point locking, or a multipoint lock, is a locking system installed in cabinet or locker doors to enable more secure locking. Whereas in single-point locking, the door on a cabinet locks only at the point where the key is turned, halfway up the edge of the door, three-point locking enables the top and bottom of the door to be ...

  6. Single-point locking - Wikipedia

    en.wikipedia.org/wiki/Single-point_locking

    Single-point locking. Single-point locking is a locking system in cabinet doors where locking takes places only at the point halfway up the edge of the door, where the latch engages with the doorjamb. The term is most often used in items like lockers, where it is contrasted with the much more secure three-point locking, which uses movable rods ...

  7. Master Lock - Wikipedia

    en.wikipedia.org/wiki/Master_Lock

    Master Lock is an American company that develops padlocks, combination locks, safes, and related security products. Now a subsidiary of Fortune Brands Innovations, Master Lock Company LLC was formed in 1921 by locksmith -inventor Harry E. Soref and is headquartered in Oak Creek, Wisconsin. [ 1][ 2][ 3] In 1970 the company was purchased by ...

  8. Locksmithing - Wikipedia

    en.wikipedia.org/wiki/Locksmithing

    Locksmithing is the science and art of making and defeating locks. Locksmithing is a traditional trade and in many countries requires completion of an apprenticeship. The level of formal education legally required varies from country to country from none at all, to a simple training certificate awarded by an employer, to a full diploma from an ...

  9. Mortise lock - Wikipedia

    en.wikipedia.org/wiki/Mortise_lock

    Mortise lock. The two main parts of a mortise lock. Left: the lock body, installed in the thickness of a door. This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket ...

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