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Crash bar doors in a school, with upper vertical rod latches. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar.
When the correct key is inserted, it will clear the wards and rotate about the center post. The key may then strike a lever, activating a latch or sliding bolt, or it may itself push against the latch or bolt. In a double acting lever lock, the key may additionally push against a spring-loaded lever which holds the sliding bolt in place.
During the day, the door cannot be locked using the normal key. [4] The night mode works as follows: Unlock the door from the outside; Push the key through the lock, so that the key protrudes from the inside of the door; Open the door and enter; Close the door and lock the door with the key; Take the key from the lock
Metal fire-resistance rated door with a lockset consisting of a locking latch bolt operated by lever handle with an escutcheon that encompasses the locking mechanism.. A lockset (alternatively lock set) is the hardware and components that make up the locking or latching mechanism that can usually be found on a door or other hinged object but can also include sliding doors and dividers. [1]
This is an accepted version of this page This is the latest accepted revision, reviewed on 19 January 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard ...
Latch bolt – A bolt that has an angled surface that acts as a wedge to push the bolt in while the door is being closed. By the use of a latch bolt, a door can be closed without having to operate the handle. Deadbolt – Deadbolts usually extend deeper into the frame and are not automatically retractable the way latch bolts are. They are ...
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