An excerpt from Kaba Ilco Tech Tip Tuesday
What is a Berlin Key?
Berlin Keys also know as a ‘forced locking key’ are an early 1900s attempt at access control created by a German locksmith named Johannes Schweiger, and produced by Albert Kerfin & Co.
This system required that the key be pushed from one side of the locking mechanism through to the other and the key could only be removed when the door was in a locked state. To operate the door the key was inserted from one side and turned to unlock the door, while capturing the key itself. Then the user would push the key to the other side of the door, and turn the key from the other side, locking the door once again, while releasing the key back to the tenant.
These types of keys were commonly used for tenement buildings in Germany, but have become less common, due to the adoption of more modern access control systems.
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