A bit of history is in order here. The use of a stationary blocking plate (ward cut) as seen in the left lock has been used in some lever locks for around 200 years. And regarding the right hand lock, the movable fence was invented also in the 1800's to prevent binding up a lever in picking attempts. I remember when that phone booth thief was making the news as I started in the lock trade in 1975. And I remember that phone locks were more sophisticated than than a typical lever lock. Interesting video.
I use one of these locks on each exit door, as well as other lever and pin locks.They are good locks. I have seen these locks picked with an umbrella pick, but I don't think it is easy.
Thanks for the expose of the lock. I have spent some time with the U.S. patents in an effort to understand the early versions of the lock. Not easily done just from the patents. But not being a collector unlikely I will every actually own one.
I wonder if it still exists? Winniza in the Ukraine would be a fascinating place to visit today! (Well, maybe not today, but after they've finished kicking out the Russians!)
Da muss man sich nicht wundern das die DDR Pleite ging. Wenn auf einem Arbeitnehmer ein ganzes Bartallion Stasileute drauf angesetzt werden. Immerhin konnte damit verhindert werden das "Gedichte (?!)" in den Westen gelangen. TOP! Ach und liebe Stasi bitte eure Einsatzautos besser warten, die hintere Tür ging nur sehr schwer zu....
