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Type of lock (e.g., combination, key, time lock, electronic locking) Location (e.g., wall safe, floor safe) Smart safes as part of an automated cash handling system; It is often possible to open a safe without access to the key or knowledge of the combination; this activity is known as safe-cracking and is a popular theme in heist films.
The safecracker will drill a hole allowing him to get his scope into a position to observe the change key hole. While spinning the dial and looking through the change key hole for certain landmarks on the combination lock's wheel pack, it is possible to obtain the combination and then dial open the safe with the correct combination.
The precursors of permissive action links were simple mechanical combination locks that were set into the control systems of nuclear weapons, such as the Minuteman ICBM. There they could perform different functions: some blocked the cavity through which the nuclear materials were shot to create a reaction; other locks blocked circuits; and some ...
The lock is invariably mounted on the inside (behind) of the difficult-to-penetrate door and is usually very modest in size and strength, but very difficult to gain access to from the outside. There are many types of lock mechanisms in use: A combination lock similar in principle to that of a padlock or safe door is very common. This is usually ...
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.
The key can then be used to unlock the kiln door. While the key is removed from the switch interlock, a plunger from the interlock mechanically prevents the power switch from being turned on. Power cannot be re-applied to the kiln until the kiln door is locked, releasing the key, and the key is then returned to the power switch interlock. [5]