Locking with multiple padlocks.

[thomas33]

If multiple people need access and you don't want to make a lot of copies of the key to the padlock, this is one way. Each person has their own lock, and when it's opened, the pin can be released.

 

[Violina]

Hard to blame someone else if you forgot to lock

 

[Violina]

However, significantly easier to cut off those padlocks or metal pieces than it is to cut off a padlock with the correct dimension for the original pin..

 

[thomas33]

It can be, for example, a road barrier or something else that doesn't need more protection than to make access more difficult.

 

[MagHam]

It was a good and easy-to-understand example of what is called a logical OR gate in electronics and system development.
Even more exciting to place the padlocks in parallel to get an AND gate

 

[useless]

It becomes an inverted AND gate when all the locks are open...

 

[Herr hatt]

Or why not get a code lock?

 

[KnockOnWood]

To the thread creator:
What function do locks 15 and 18 on the picture serve?

 

[Avle]

To the thread starter: What function do locks 15 and 18 in the picture serve?

If you turn the pin, you can remove the locking plate and the pin. Look again and you'll understand.

 

[KnockOnWood]

If you turn the pin, you can remove the lock plate and the pin. Look again, and you'll understand.

No, I'm too old and dumb to get it

 

[HSP]

I have encountered that version but only with three locks. Another variant I've come across is a chain across the road with several locks attached as links.

All the locks in the image seem to be from the same manufacturer, so having a master lock system with multiple different keys might have been simpler. If they can't distribute identical keys to everyone.

It can sometimes be difficult since one lock owner could be a landowner with the same locks on all their gates, the next lock owner could be the municipality, e.g., the water department, power grid company, summer cottage owner, the railway administration, etc., it all depends on how many need access.....

 

[tommib]

That was a good and easy-to-understand example of what is called a logical OR-gate in electronics and systems development.
Even more exciting to put the padlocks in parallel to get an AND-gate

I didn't think of it that way, but it's certainly true.

The AND-gate is applied, among other things, to safety deposit boxes where in some cases two (different) keys are required to open.

How to set it up with different actors who need access is interesting. The simplest is, of course, code locks or card readers (where you can add any card) but this requires electricity unless it is a simple mechanical code lock.

 

[Nyfniken]

The easiest is of course combination locks or card readers (where you can insert any card), but it requires electricity unless it's a simple mechanical combination lock.

Unfortunately, it is then very easy to copy the key.

 

[Nyfniken]

To the thread creator:
What function do locks 15 and 18 serve in the picture?

Without them, it is unlocked.