A double cylinder deadbolt operates by requiring a key to lock or unlock the bolt from both the outside and the inside of the door.
Understanding the Double Cylinder Deadbolt
Unlike single cylinder deadbolts which have a keyed cylinder on the outside and a thumbturn on the inside, a double cylinder deadbolt incorporates a keyed cylinder on both sides.
Based on the provided reference:
- A double cylinder deadbolt assembly includes two keyed cylinders, one for the outside of the door and one for the inside.
How it Operates
The key characteristic of a double cylinder deadbolt is the necessity of a key for operation on either side:
- Locking: To extend the bolt and lock the door from either the inside or the outside, you must insert the appropriate key into the cylinder on that side and turn it.
- Unlocking: Similarly, to retract the bolt and unlock the door, you must use the key in the cylinder on the side you are on.
As the double deadbolt requires a key to lock or unlock from either side, this design ensures that the lock cannot be accidentally locked or unlocked without the key.
Key Characteristics
Here's a simple breakdown of its core features:
- Inside Operation: Requires a key.
- Outside Operation: Requires a key.
- Components: Two keyed cylinders (exterior and interior).
This design provides a specific type of security and control over access.
