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A Dutch door with the top half open, in South Africa Woman at a Dutch Door, 1645, by Samuel van Hoogstraten Old half-door in East Crosherie, Wigtownshire, Scotland. A Dutch door (American English), stable door (British English), or half door (Hiberno-English) is a door divided in such a fashion that the bottom half may remain shut while the top half opens.
Higher security lever locks (such as the five-lever) usually have notches cut into the levers. These catch the locking bolt and prevent it from moving if picking is attempted (similar to the security pins in a pin tumbler lock). The Chubb detector lock is a variation of the lever lock which was designed to detect and prevent picking attempts.
A Dutch door with the top half open, in South Africa. The Dutch door (also known as stable door or half door) is a type of door divided horizontally in such a fashion that the bottom half may remain shut while the top half opens. The initial purpose of this door was to keep animals out of farmhouses, while keeping children inside, yet allowing ...
The biggest lock at the location is the Prins Willem-Alexander Lock opened in 1995. This is a lock of an innovative type, with sliding gates which use a 'hydro foot'. The hydro foot is an alternative to the wheels which normally support a sliding gate. The idea is that a 0.1 mm layer of water in the two hydro feet supports the 50 ton lock door.
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 to secure the top and bottom of the door when the door is locked, and the term is not normally used in situations where single-point locking is the only option normally found.
Keys for some types of warded locks often have a characteristic symmetrical shape. The one on the right is a skeleton key. A warded lock (also called a ward lock) is a type of lock that uses a set of obstructions, or wards, to prevent the lock from opening unless the correct key is inserted. The correct key has notches or slots corresponding to ...
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