To lock a push bar door, typically a dogging key or a mortise cylinder key is used, depending on the type of locking mechanism installed.
Here's a breakdown of how push doors commonly lock:
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Dogging Mechanism: Many push bar doors utilize a "dogging" mechanism. This allows the door to be unlocked for free egress (exiting) during certain times but can be locked down for security.
- To lock using the dogging feature, a dogging hex key is inserted into a specific keyhole on the push bar hardware. This key retracts the latch bolts, effectively keeping the door closed but unlocked from the inside for easy exit.
- To fully lock the door, the dogging mechanism is disengaged, and a mortise cylinder lock engages, typically using a standard key.
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Mortise Cylinder Lock: Another common method involves a mortise cylinder lock integrated into the door's hardware.
- An external keyhole is usually present on the outside of the door.
- Inserting and turning the appropriate mortise cylinder key throws a bolt into the door frame, securing the door shut.
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Checking for an External Locking Mechanism: It's crucial to visually inspect your push bar door for the presence of an external keyhole. This is typically a small, rectangular opening located on the outside of the door, near the push bar hardware. If one exists, it indicates a mortise cylinder lock that can be operated with a key.
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Electric Strikes: Some push doors utilize electric strikes. These require electrical power to release, allowing access with a key fob, keypad, or similar system. When power is cut or the system is locked down, the door remains locked.
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Emergency Exits: It's important to remember that emergency exits with push bars must always allow egress (exiting). Locking mechanisms are generally designed to restrict entry from the outside while always allowing exit from the inside during emergencies.
In summary, push doors usually lock through a dogging mechanism used in conjunction with a mortise cylinder lock, where a key is required to prevent entry from the outside, or through electronic means like electric strikes, while maintaining the ability to exit from the inside.
