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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. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.
In the US, UL rated doors must retain their rating: in new construction doors are cored and then rated. but in retrofits, the doors must be re-rated. Electrified exit hardware, sometimes called "panic hardware" or "crash bars", are used in fire exit applications. A person wishing to exit pushes against the bar to open the door, making it the ...
Working with his neighbor, Henry H. DuPont, an Indianapolis architect, the two men developed and were awarded a series of nine patents relating to new and improved exit door hardware. All of the patent designs focused on a single lever bar (and related hardware) that would cause a locked door to pop open when simple interior pressure was ...
The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC, 24 VDC (common), 24 VAC, 120 VAC, or 240 VAC. The closed doors may or may not mechanically latch or lock in the closed position.
This delay reserves time for security personnel to get to the door before the door opens. The lock will also release if there is a fire alarm or power failure, but otherwise these locks hold the exit doors shut. Exit control systems can include a "request to exit detector" such as a pushbutton that opens the exit, if exit requests are enabled.
Modern manual door closer Eclipse door spring and separate checking mechanism. A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior.