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Animation of a lever tumbler lock mechanism. A lever tumbler lock is a type of lock that uses a set of levers to prevent the bolt from moving in the lock. [1] In the simplest form of these, lifting the tumbler above a certain height will allow the bolt to slide past.
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
Some sliding doors run on a wall-mounted rail, like this one Sliding doors in a modern wardrobe. The 'top-hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move.
Again, the term refers to the lock mechanism, so a lock can be both a mortise lock and a lever tumbler lock. In the modern lever tumbler lock, the key moves a series of levers that allow the bolt to move in the door. [5] Pin tumbler lock, commonly used for mortise locks in the US. The next major innovation to mortise lock mechanisms came in 1865.
Three point lock are also commonly used in wardrobes, like from Hettich [6] [7] Single-point locking may provide adequate security for some situations on tiered lockers, as the doors are shorter, and therefore more difficult to force open; however, the taller doors of full length lockers and cabinets are more susceptible to the application of leverage.
The latch bolt is disengaged (retracted) typically when the user turns the door handle, which via the lockset's mechanism, manually retracts the latch bolt, allowing the door to open. A deadlocking latch bolt ( deadlatch ) is an elaboration on the latch bolt which includes a guardbolt to prevent " shimming " or "jimmying" of the latch bolt.