combination locks are a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an electronic or mechanical keypad.
There are several types of combination locks differing by operation process, security measure and price.
Multiple-dial locks: One of the simplest types often seen in low-security bicycle locks and briefcases, uses several rotating discs with notches cut into them. The lock is secured by a pin with several teeth on it which hook into the rotating discs. When the notches in the discs align with the teeth on the pin, the lock can be opened.
Single-dial locks: Found on padlocks, lockers, or safes may use a single dial which interacts with several parallel discs a lock of this type is opened by rotating the dial in several directions according to the numeral code given by the manufacturer. The discs typically have an indentation or notch, and when the correct combination is entered, the notches align, allowing the latch to fit into them and open the lock.
Pad locks: Many doors use combination locks which require entry of a numeric sequence on a keypad to gain entry. These special locks usually require the additional use of electronic circuitry, although there are purely mechanical keypad locks. the main of this mechanism is that multiple partys can be granted access without having to supply a physical key to each one. Also, in case one of the keys is compromised, changing the lock requires only configuring a new key code which is a cheaper and quicker solution opposed to traditional key locks.
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