Pin tumbler lock

Pin tumbler lock

The pin tumbler lock is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key. Pin tumblers are most commonly employed in cylinder locks, but may also be found in tubular or radial locks.

History

The basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door, and a horizontal bolt that slid into the post. The bolt had vertical openings into which fitted a set of pins. These could be lifted, using a key, to a sufficient height to allow the bolt to move and unlock the door.

Inventor Linus Yale, Sr. patented a cylindrical pin tumbler lock in 1848, a design which was further improved and patented by his son, Linus Yale, Jr., in 1861. Yale, Jr.'s design is very similar to pin tumbler locks manufactured today.

Design

The pin tumbler is commonly used in cylinder locks. In this type of lock, an outer casing has a cylindrical hole in which the "plug" is housed. To open the lock, the plug must rotate.

The plug has a straight-shaped slot known as the "keyway" at one end to allow the key to enter the plug; the other end may have a "cam" or lever which activates a mechanism to retract a locking bolt. The keyway often has protruding ledges which serve to prevent the key pins from falling into the plug, and to make the lock more resistant to picking. A series of holes, typically five or six of them, are drilled vertically into the plug. These holes contain "key pins" of various lengths, which are rounded to permit the key to slide over them easily.

Above each key pin is a corresponding set of "driver pins", which are spring-loaded. Simpler locks typically have only one driver pin for each key pin, but locks requiring multi-keyed entry, such as a group of locks having a "master key", may have extra driver pins known as "spacer pins". The outer casing has several vertical shafts, which hold the spring-loaded pins.

When the plug and outer casing are assembled, the pins are pushed down into the plug by the springs. The point where the plug and cylinder meet is called the "shear point." With a key properly cut and inserted into the groove on the end of the plug, the pins will rise causing them to align exactly at the shear point. This allows the plug to rotate, thus opening the lock. When the key is not in the lock, the pins straddle the shear point, preventing the plug from rotating. Sets of locks with a master key will have one set of shear points that are identical to the others in the set and one set that is unique to that specific lock.

ee also

* Cylinder lock
* Disc tumbler lock
* Lock bumping
* Lock picking
* Magnetic-coded lock
* Padlock
* Tubular pin tumbler lock
* Yale (company)

Patent

* -- "Lock"
* -- "Lock"
* -- "Lock and key"

External links

* [http://www.yalelock.com/Yale/Templates/GlobalNormalWithMenu____1033.aspx The pin tumbler invention] at Yale company site
* [http://www.typesoflocks.com/locking-it-up-with-a-pin-tumbler-lock.php Locking It Up with a Pin Tumbler Lock]
* [http://www.lockpickguide.com/pintumblerlockpick.html How to pick a pin tumbler lock]
* [http://www.phoenix-locksmiths.com/locksmith_news.php?aid=plc1 The history of pin tumbler lock]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Tubular pin tumbler lock — A tubular pin tumbler lock, also known as Ace lock or axial pin tumbler lock or radial lock , is a variety of pin tumbler lock in which 6 8 pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in… …   Wikipedia

  • Wafer tumbler lock — A wafer tumbler lock is a type of lock that utilizes a set of flat wafers to prevent the lock from opening unless the correct key is inserted. This type of lock is similar to the pin tumbler lock and works on a similar principle. However, unlike… …   Wikipedia

  • Disc tumbler lock — The underside of a disc tumbler lock. A disc tumbler lock or Abloy Disklock is a lock composed of slotted rotating detainer discs. A specially cut key rotates these discs like the tumblers of a safe to align the slots, allowing the sidebar to… …   Wikipedia

  • pin tumbler — noun cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown • Syn: ↑pin • Hypernyms: ↑tumbler • Part Holonyms: ↑cylinder lock * * * noun …   Useful english dictionary

  • Lock bumping — is a lock picking technique for opening a pin tumbler lock using a specially crafted bump key . One bump key will work for all locks of the same type.HistoryIn the 1970s, locksmiths in Denmark shared a technique for knocking on a lock cylinder… …   Wikipedia

  • Tumbler — may refer to:* A part of a lock whose position must be changed by a key in order to release the bolt (see also: pin tumbler lock, tubular pin tumbler lock, and disc tumbler lock) * Flat bottomed glassware and drinkware without a handle, foot, or… …   Wikipedia

  • Lock (device) — 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.History of locksSecuring one s property… …   Wikipedia

  • lock — lock1 lockless, adj. /lok/, n. 1. a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, dial, etc. 2. a contrivance… …   Universalium

  • Lock picking — is the act of unlocking a lock by analyzing and manipulating the components of the lock device, without the original key. Although lock picking can be associated with criminal intent, it is an essential skill for a locksmith. Lock picking is the… …   Wikipedia

  • lock — I (New American Roget s College Thesaurus) v. t. fasten, secure, make fast. See closure, junction. II (Roget s IV) n. 1. [A device for locking] Syn. hook, catch, latch, bolt, bar, staple, hasp, clinch, bond, fastening, padlock, safety catch,… …   English dictionary for students

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”