multiplug

[dls]

try this one for size.
take the front of the plug with two pins and cut it off now replace it with a hardened steel one with two pins.
leave a small gap for a spring then add a couple of more pins to the remainder of the plug the one key must pass through both plugs and turn them at the same time.
in normal operation it will act as a normal key but in picking you would have to try to tension both plugs together, the inner keway could be slightly different to the outer to prevent the same tensioner being used which would mean that you would have to turn the outer first which would block the inner.
so why the spring between the plugs? the outer plug would be able to move in and out slightly,when bumping the outer plug would move inwards slightly and if it had serrated pins it would jam in the barrel due to the axial load temporarily jamming the bumpkey.
the hardened outer core could also have a second set of top pins at 45 degrees to allow it to be turned with shorter 2 pin key to the 45 position to prevent bumping and slow picking
yet another advantage is that if someone wanted the barrel could have a weak point at the joint of the two plugs to reduce the risk of snapping

[vov35]

eh... what about using a special tensioner to just pick the back section of plug?

[Poff]

eh... what about using a special tensioner to just pick the back section of plug?

Adding a side bar would require you to pick both.

[dls]

ok by bypassing the front plug and just turning the back one you going to block the keyway or trap the pick as soon as the plug moves the smallest amount ,im assuming that we would be using a tough profile here with little tolerance for misalignment of the two plugs. the reason for the extra pins in the back plug is to make it no easier than a normal 6 pin to pick if the outer happens to be bypassed.

as for the side bar it would tie the two plugs together and stop the spring loaded anti bump function, independant plugs is what im after the outer plug is not there as part of the main pinning thats why there are 6 pins in the inner plug its there to frustrate picking, prevent bumping, prevent snapping and add some drill protection. oh and the other idea of turning the outer to a blocking position.

[TORCH [of KCK]]

Hey,
Just signed up, & 1st time in any forms.
You ARE on to something.

Reason for coming into here,
Is what & where you started with.

That is...
You need to incorporate 4 more elements,
To the lock.

Difference between yours & mine,
(Starting off)
I'm set on 3 @ 2 pin plugs.

Now, the additional elements are:
* front detent retainer
* rear detent retainer
* limitation bar
* trap wafer(s)

(Between work & grind - still taking sweet time making prototype)

[Daltonj21]

I think people call this a split core.

[mh]

If you add sidebars to a split core, you can make it a 360 degree free spinning design, like the Chinese Yuema design - http://locktechinc.com/news/?p=670 - which is pretty cool

[TORCH [of KCK]]

Just to clarify myself,
I do not call a side bar,
a limitation bar.

My use of a limitation bar
Is to limit :
* Degree of angle of front plugs
* prevent the bypass of the front plugs

My use of a ft. & rr. Detents
Is used for total plug retention
* restriction directional travelS
* restriction distances of travel
* & just plainly hold plugs in.

[TORCH [of KCK]]

And FYI

I'm using a 6 pin
(Non mortise)
Schlage lock,
As prototype.

So "dls"
If you can complete yours,
Before I.... mine,
more power to you.

[Squelchtone]

So "dls"
If you can complete yours,
Before I.... mine,
more power to you.

Just a heads up but last time dls wrote in this thread was 2011. He was on earlier this year but not since April. You stumbled upon a thread that has been dormant for 5 years.