Originally Posted by
Tommyr
I doubt they are disk tumblers, these can be picked so fast it's ridiculous. I can pick a disc tumbler in seconds. But I used to be a locksmith. I've never seen a Kryptonite lock in person yet but my guess it's similar to a tubular lock but with newer style mushroom type pin(s) in it. Maybe you mean a side bar tumbler lock? These were used on automobiles. Still are I'd imagine. I had a hard time picking those.
No, they use rotating disk tumblers. No spring tension on them at all, no drivers. They rotate to the shear line.
Ever see a 'tibbe' key/lock? Older Jaguars in particular used them, as well as many british safe deposit locks. I'm sure that they have been used on other locks, but those come to mind. Angled cuts to varying depths on the keys correspond to the tumblers. This cylinder/key system was originated in england as far as I know.