Lock (device)

From Free net encyclopedia

Image:Padlock.jpg A lock is a mechanical fastening device which may be used on a door, vehicle, or container, restricting access to the area or property enclosed. Commonly, it can be released by using a key or combination.

Early history of locks

Securing ones possessions' has long been a concern of people throughout the world. Beyond hiding the objects or constantly guarding them the most frequently used option is to secure them with a device. Early solutions included knots to either detect, like the Thief knot, or hamper, like the Gordian knot.

The first known lock with a key was a pin where a cylinder of wood with a hole drilled through its axis was the key. The length of the cylinder was the critical factor. It was strung on a rope hanging out of a hole in a door. Then the key was inserted into the hole and the rope pulled to push the cylinder to push the bolt the correct distance. To lock the door just pull on the rope to extract the key cylinder and simultaniously pulling the bolt close. This type of lock is still in use in certain parts of the world. A danger of this lock was a vandal could push the rope into the hole; an ancient equivalent of putting glue into a lock.

Early improvements in pin locks included increasing the number of pins to increase security, and changing the orientation of the pins to allow the key to provide the unlocking force instead of a rope. Thus establishing the principles of the modern Pin tumbler lock.

Next was developed a warded lock that is still used in modern times when the security required in not high and cost is a significant factor. It is the first lock design to have a key recognizable to a modern western person.

Lock puzzles were used to obscure the locking mechanism or even provide a nonfunctioning lock for the thief to waste time on.

Types of locks

• Bicycle lock
• Child safety lock
• Combination lock
• Cylinder lock
• Disc tumbler lock
• Electronic lock
  • Magnetic lock
  • Electric strike
• Lever tumbler lock
  • Chubb detector lock
• Padlock
• Pin tumbler lock
  • Tubular pin tumbler lock
• Warded lock
• 5 Lever Lock

See also

• Lock picking
• Locksmithing
• Physical securityde:Schloss (Technik)

fr:Serrure he:מנעול nl:Slot (sluiting) ja:鍵 (道具) pl:Zamek (urządzenie) ru:Замок (устройство для запирания дверей) fi:Lukko sv:Lås zh:锁