Lock (fastening device)
     INTRODUCTION       Key and Lock Mechanism   This diagram shows the way a key opens its corresponding  lock. When the key is inserted into the lock, its grooves raise spring-loaded  pins of corresponding sizes. This permits the key to turn the cylindrical plug  and open the lock. Only a key with grooves that exactly correspond to the size  of the pins will permit the plug to rotate in the lock barrel.                 Lock (fastening  device) , mechanical device used for fastening doors, chests, and lids,  consisting essentially of a bolt guarded by a mechanism released by a  key  or a combination.                                  Mechanical Bolt Lock                                                       Mechanical Bolt Lock   A bolt lock functions when a key is inserted into the  notch, or talon. The key moves the bolt backward or forward, depending on  whether the user is opening or closing the lock.   Encarta  Encyclopedia   Michael Boys/Corbis                 ...

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