May 27, 2009 4:25 AM Subscribe
What is the use of double locks? Not two separate lock, just the kind of lock that you can turn once (which locks the door) and then another time, in the same direction (which locks the door... more?).
posted by Skyanth to Grab Bag (13 answers total) 2 users marked this as a favorite
If the door is only safely locked with two turns of the key, why would you offer the option to turn it only once? And if the door is just as safely locked with only one turn of they key, why offer the option for a second turn?
I've been thinking about his for some time. The only explanation I can come up with is that one turn is not enough to push the bolt far enough to really lock the door. But that would mean that all non-double locking doors are actually not safe? Surely that's not true.