ISAD21 MODULE5

• Lock - This is defined as mechanical, electrical, hydraulic, or electronic device designed to prevent entry to building, room container or hiding place (Manwong, 2008)
• Protective locks - are commonly used to avoid unwanted access to properties, such as houses, warehouses, factories, etc.
• GENERAL TYPES OF LOCK

  1. Key-operated mechanical lock
  2. Padlock
  3. Combination Lock
  4. Code-operated lock
  5. Card-operated lock
  6. Electrical lock
  7. Biometrics
• Key-operated mechanical lock – This is a lock by which mechanism is that it will only operate when its internal barriers are properly aligned.
• Lever tumbler lock – each lever being attached on a fixed point and is held against a stop by the pressure of the flat spring.
• Pin tumbler lock – this compose of a number of round pin or tumblers operating in cylinder
• Padlock - This is a portable lock having a sliding hasp which passes through a staple ring. A type of lock that has a U-shaped hinge designed to hook onto the item that needs to be secured.
• Code-operated lock - Lock by which mechanism is operated by pressing button of codes
• Card-operated lock - A type of lock that can be operated by a card that is coded
• Electrical lock - A type of lock that can be operated through means of electricity.
• Biometrics - A machine that can be used for identification of human by their characteristics or traits.
• KEY - This is a device that is used to open a door. Key has two main parts: The blade and the bow. Blade is the part that is being inserted in the lock. Bow refers part that manipulates the movement of the blade.
• Change key - A key that operates one lock only. All keys are considered change keys
• Master key - A type of key that is capable of opening a series of lock. These keys can be used in all locks for one building. E.g school department
• Grand Master key - A key that can operate all locks usually used for large buildings such as hospitals or office buildings
• Disc tumbler lock – also known as wafer tumbler. This has metal tumblers with open center fitted into a lock
• Combination lock - A type of lock that uses numbers, letters or symbols instead of using the key. Those characters will enable the operator to align the pins.