My idea for unpickable lock

[iv81]

Hi I'm new. And I am delighted to see so many bright people here being able to pick different types of locks and I was wondering if there are any types of locks that are pick proof.

I had to go through lots of posts and searches but non that I saw had a solution to my problem of finding the perfect lock. But then it hit me!

Ok, so you're wondering what my idea is, well to put it quite simply it's a lock that counts change. Simmilar to those coin counting machines you throw a batch of chnage in at the highway tolls. Basicaly the right combination of change (ie: quarters nickels dimes and pennies) and total of (ie: $1.32) will quietly open a lock without giving any feedback as to it being a corrcct combination. And just to make it pick proof, a wrong combination of change and few tugs of the handle or door pushing like say 5 times will either temporarily lock the mechanism for a given period of time and at the same time store and collect the change that was thrown in and anything after. Basicaly if anyone tried to break in, you keep their hard earned $ Just a thought..

[digital_blue]

Inventive. I'll give you that. Doesn't sound very user-friendly or practical to me though. I don't even like needing exact change for a pop machine.

db

[Badmonkey005]

LOL DB!

well seeing as how it does not require a key you are right, it would be impossible to pick

however to bypass it...

THERMITE!


hahaha always wanted to say that

[Chrispy]

So, you have to put in a whole bunch of change in order to open the lock? Does the lock give you your change after the correct amount has been inserted? If so, that's a pretty effective decoder.

[iv81]

Inventive. I'll give you that. Doesn't sound very user-friendly or practical to me though. I don't even like needing exact change for a pop machine.

db

Well, in tems of user frienly, I don't know but practical I'd kinda dissagree. Let's say you wanted to have a babysitter come over, instead of lending a copy of your high security key or a regular key, you simply tell her to bring certain ammount of change and drop it in. She later picks it up when inside to either reuse later or for keeps.

The idea is that internaly the ammount of change combination could be easily changed in seconds using a regular key for access. So incase she wants to sneak in when not invited, she gets locked out due to changed combo and you get to keep her change. At the same time the ammount that was dropped can also be counted to determine who knew that combo.

[iv81]

LOL DB!

well seeing as how it does not require a key you are right, it would be impossible to pick

however to bypass it...

THERMITE!


hahaha always wanted to say that

Thermite doesn't work horizontaly, only dependant on gravity even verticaly it's needed in greater ammounts (around 10 grams minimum) to melt even slightly through metal like brass. Change lock can offer a variety of postions having the lock placed above the actual coinslot would be a good proposal.

[Omikron]

LOL DB!

well seeing as how it does not require a key you are right, it would be impossible to pick

however to bypass it...

THERMITE!


hahaha always wanted to say that

Thermite doesn't work horizontaly, only dependant on gravity even verticaly it's needed in greater ammounts (around 10 grams minimum) to melt even slightly through metal like brass. Change lock can offer a variety of postions having the lock placed above the actual coinslot would be a good proposal.

Sorry iv81, you're new here. Thermite is a running gag here at LP101 and we never speak of it in any serious fashion. I think digital_blue even has an image or something that he posts once in a while when thermite is mentioned...

[iv81]

So, you have to put in a whole bunch of change in order to open the lock? Does the lock give you your change after the correct amount has been inserted? If so, that's a pretty effective decoder.

It keeps all change on the other side of the door. Havign it give the change back would provide a bruite force method of enterance whereas the secure lockout period wouldn't be very effective either.

[Chrispy]

So I take it you have to put in the exact amount of change? Not very user friendly at all.

"I've got $1.30. $1.30! A dollar freakin' thirty!! Open the freakin' door!! I don't have two cents!! Gawd dagnab freakin... arrrrghhhh!!!!"

[iv81]

So I take it you have to put in the exact amount of change? Not very user friendly at all.

"I've got $1.30. $1.30! A dollar freakin' thirty!! Open the freakin' door!! I don't have two cents!! Gawd dagnab freakin... arrrrghhhh!!!!"

I would assume, once you know the ammount required, you may use a small pouch to carry the exact change always with you.

But in your case you could always..

1. borrow/ask from somone
2. buy something with cash and ask for proper change.
3. keep a bag full of various change in a hidden place around your home.
4. use metal detector
5. beg

[Omikron]

So I take it you have to put in the exact amount of change? Not very user friendly at all.

"I've got $1.30. $1.30! A dollar freakin' thirty!! Open the freakin' door!! I don't have two cents!! Gawd dagnab freakin... arrrrghhhh!!!!"

I would assume, once you know the ammount required, you may use a small pouch to carry the exact change always with you.

But in your case you could always..

1. borrow/ask from somone
2. buy something with cash and ask for proper change.
3. keep a bag full of various change in a hidden place around your home.
4. use metal detector
5. beg

6. not use a lock that relies on the proper change in order to operate

[iv81]

Sorry iv81, you're new here. Thermite is a running gag here at LP101 and we never speak of it in any serious fashion. I think digital_blue even has an image or something that he posts once in a while when thermite is mentioned...

Oh

Well, I did have experience with thermite using iron oxide Fe2O3 (red) not Fe2O4 (black). Mixed in 60/40 with Al It took about a gram to melt throgh an aluminum pan, and even then most of the temperature was absorbed and cooled throguh the pan, I would immgine it would take a hell of alot to melt through a steel or brass lock. Any metal that requires more than 5000F to melt would simply be thermie proof such as tungsten or carbon steel.

[iv81]

6. not use a lock that relies on the proper change in order to operate

I guess it's not for everyone. Tell me which lock you preffer then. I'm highly interested.

[Omikron]

Sorry iv81, you're new here. Thermite is a running gag here at LP101 and we never speak of it in any serious fashion. I think digital_blue even has an image or something that he posts once in a while when thermite is mentioned...

Oh

Well, I did have experience with thermite using iron oxide Fe2O3 (red) not Fe2O4 (black). Mixed in 60/40 with Al It took about a gram to melt throgh an aluminum pan, and even then most of the temperature was absorbed and cooled throguh the pan, I would immgine it would take a <censored> of alot to melt through a steel or brass lock. Any metal that requires more than 5000F to melt would simply be thermie proof such as tungsten or carbon steel.

The melting point of Tungsten is 6170F, while Carbon Steel's melting point is a measly 2800F. This means that while Tungsten may survive a thermite attack, carbon steel, and several other metals, could not only be melted but vaporized.

That aside, yes, it would take a butt-load of thermite to melt through a lock in a matter that gave you access. I'm sure you could severely damage the lock with a small amount, but you wouldn't actually gain access.

[iv81]

Since the change lock would operate on small amount of electric current, I just thought up of an idea incase of blackout or for general wireless use. The idea is that there could have a door knob where couple of turns would crank up enough electric current to activate and fill up it's capacitors for unlocking mechanism. A green status light would indicate when to start the insertion of correct change for unlocking.