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2. Combination lock - Wikipedia

   en.wikipedia.org/wiki/Combination_lock

   A Wordlock letter combination lock.. A combination lock is 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 or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

3. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   This is a trapped-key interlock on the door of an electrical switchgear cabinet. It is attached with one-way security screws to discourage casual removal, which would defeat the interlock scheme. Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped-key interlocks ...

4. Tubular pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

   A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.

5. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   The differences are in the locks the key will operate. These master-keyed locks are configured to operate with two, or more, different keys: one specific to each lock (the change key), which cannot operate any of the others in the set, and the master key, which operates all the locks in the set. [1] Locks that have master keys have a second set ...

6. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.