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door lock

  • Author:Helen Li
  • Source:SMQT
  • Release on:2016-07-28
      Door lock

The two most common types of locks in a home are simple key locks in a doorknob and deadbolt locks. Key locks contain a small cylinder that runs down the middle of the doorknob and into the door. Inside the cylinder are all the parts that work together with the key to lock or unlock the door. When the door is unlocked, a part called a tang is resting fully inside of the cylinder. When the door is locked, the tang is partially in and out of the cylinder.