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Four Keyed Safe? Answered

Ok, so in a book I recently read, the plot of the story was to find the keys to a safe the boys father had left him for his 13th birthday.  This safe had four keyholes with four matching keys, so I want to replicate this safe.  Any ideas on how to create blueprints for it.  Remember, the safe had four keys on the outside, it's not like one safe, then another, then another.
Anything would be helpful.
Thanks

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Nostalgic Guy (author)2011-02-08

What was the book called?
Was there anything special about how the safe opened?
For example did it require the locks to be opened in a certain order? were all the locks on one door or on different faces of the safe?
If there was then a bit more information about how the safe operated may get some more imaginative answers.

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user

All of those are essentially a matter of making sure the right mechanical linkages exist to transfer operation of the locks to controlling the door bolts.

If you want the wrong sequence to do something else, that can be done too but will again require more complexity in the linkages.

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user

Quite right but wouldn't it be so much more fun to create something like that than a simple door with four locks on it?
My question is still unanswered, if the safe in the story has any special features then they should be taken into consideration when answering the original question about replicating the safe.
This is why I asked the name of the book or for a more detailed description of the safe in the story otherwise it's a bit like asking how to make a box, that is easy but if the box has to be water tight or hold a great deal of weight then these facts need to be considered.

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user

Depends on what you're trying to do. So, yes, I agree with you that "what else defines it besides four locks" is a valid question.

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orksecurity (author)2011-02-08

Trivial, isn't it? Just mount four separate locks so their bolts hold the door closed, either directly or (as is more commonly done in serious safes) by blocking the travel of the door-bolt retraction mechanism.

If you know how a one-lock safe works, it's just a matter of adding three more locks.

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orksecurity (author)orksecurity2011-02-09


Possibly useful note: Standard safe-deposit box locks are "dual custody" locks -- two different keys are required to open the lock, one of which the customer has and the other being one the bank keeps. There are a couple different designs. They aren't very expensive, either, and they're fairly pick-resistant (not least because fewer people know how to pick that type of lock). Two of those and you have your four keyways, with some built-in sequencing (usually the guard key has to be turned before the customer key can be used to open the lock).

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kelseymh (author)orksecurity2011-02-08

And if Whiskrs don't know how a one-lock safe works, that's a great (and easier) research project for him!

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orksecurity (author)kelseymh2011-02-08

... which is why I left it at that.

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