The lock that can't be opened with a key.

[vov35]

I think that in picking, your side pin would press on the pick, and thus be pretty easy to simply push back and forget about.

[dls]

as i said it would be mushroom shaped to increase difficulty in putting it back the main reason for any spool pin etc in any lock is to delay the attacker. think of it like this, security causes delay, delay causes stress, stress causes mistakes, mistakes cause delay and so on

[Tighran]

Pretty neat idea. The slider reminds me a bit of the seting mechanism on a Kwikset Smartkey.

As a simple though less creative way of doing this... Could you make a cylinder where one of the pin stacks, say the third, was slightly out of alignment (though still perpendicular to the axis of rotation of the plug) with all the others? If all the other stacks were then pinned with spools to allow the plug to rotate slightly in a false set so the misaligned cylinder stack aligns with the plug stacks, and was then pinned with a regular pin, you'd lock the plug in place and prevent it from counter-rotating to allow the spools to be set properly. As long as the regular pin wasn't the first one (or perhaps if it was, depending on the key bitting), a key would be unable to set it properly and there'd be no way to push the key past the bound spool pins.

Seems like a neat thing to try making a proof-of-concept of, but I don't have the machinery available.

[FarmerFreak]

As a simple though less creative way of doing this... Could you make a cylinder where one of the pin stacks, say the third, was slightly out of alignment (though still perpendicular to the axis of rotation of the plug) with all the others? If all the other stacks were then pinned with spools to allow the plug to rotate slightly in a false set so the misaligned cylinder stack aligns with the plug stacks, and was then pinned with a regular pin, you'd lock the plug in place and prevent it from counter-rotating to allow the spools to be set properly. As long as the regular pin wasn't the first one (or perhaps if it was, depending on the key bitting), a key would be unable to set it properly and there'd be no way to push the key past the bound spool pins.

That would definitely prevent a key from working.

One important thing to make note of is that the lock would need to be properly reset each time. It depends on the direction the lock was rotated back to neutral. One way the spool pins would drop first, then tilt and the non-spooled pin would drop in locking them into place. The other direction the non-spooled pin would drop into place and then the spooled pins would remain picked.

Seems much simpler to make than what I did. I like it.

[C locked]

No able to use a key
Surely this lock would require a
Redesign of the key
To require an active mechanism
Where the active mechanism is tip stopped
And the 4th pin is its only full height

And the active mechanism is on a slider
Small dovetail or pin in groove

Eg
<-^--- attached to <^-^^^

[FoxMacLeod2501]

No able to use a key
Surely this lock would require a
Redesign of the key
To require an active mechanism
Where the active mechanism is tip stopped
And the 4th pin is its only full height

And the active mechanism is on a slider
Small dovetail or pin in groove

Eg
<-^--- attached to <^-^^^

I really thought this was a haiku, or something like a haiku, for about ten seconds.

[GWiens2001]

No able to use a key
Surely this lock would require a
Redesign of the key
To require an active mechanism
Where the active mechanism is tip stopped
And the 4th pin is its only full height

And the active mechanism is on a slider
Small dovetail or pin in groove

Eg
<-^--- attached to <^-^^^

I really thought this was a haiku, or something like a haiku, for about ten seconds.

ROFL

Gordon

[C locked]

So did i when I wrote it
But i lost myself in the
smallness of the phones
screen and my forgetting
the rules of haiku

Stand back. i know haiku
Or do i

[lockworksokc]

This was a great post and pictures. This reminds me of when we used to drill and insert roll pins into the sides of plugs- which changes the keyway- to add great, great, great,great grand masters to an existing system.