5 ms·

How is that mechanism not, itself, a lock? It's an unusual (and well suited) kind of lock, sure, but still a lock.

• JdeBP 8y ago
  Try pointing to the part that is the key that unlocks it, and you will see. (-: Yes, strictly speaking the headlined article is likely talking about door bolts not locks.
  • amalcon 8y ago
    There are plenty of locks that do not use keys, e.g. a keyless deadbolt.
    • JdeBP 8y ago
      No. The key that unlocks a "keyless" deadbolt is the code that one types in.
      • amalcon 8y ago
        That type exists, yes. There is also the variety that is simply impossible to unlock from one side.