How does a espagnolette lock work?

A surface bolt lock is a security mechanism commonly used in doors and gates. It is also called a three-point lock because it has three locking points - top, middle, and bottom.

First and foremost, the surface bolt lock has a central unit that serves as the main or central lock. This is the lock that you open and close directly with your key. The central lock is connected to bolt rods that extend vertically along the inside of the door.

When the key is turned in the main lock, these bolt rods activate the other two locks. Turning the key clockwise locks the top and bottom locks, securing the door at three points. Turning the key counterclockwise opens the top and bottom locks, unlocking the door.

• The advantages of a surface bolt lock are that it provides significant security, as the door is locked at three points, making it more difficult for burglars to break in.
• One disadvantage could be that improper installation can lead to jamming issues. Therefore, it is important to have the installation carried out by a professional.