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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.
On many exits, the user may have to push against a crash bar or other door opening device for a period of time to unlock the door. Many exits have a sign reading, "Emergency exit only, alarm will sound if opened", to warn of the fact that it is an emergency exit only.
Carl Jacob Prinzler (June 6, 1870 – May 30, 1949) was an American engineer who invented the "panic bar" device for doors that allowed them to be opened from the inside despite being locked on the outside.
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 ...
Fire doors need to be closed in case of fire to help prevent the spread of fire and smoke. Any fire doors which are normally held open must automatically close and lock when a fire is present in the building. The function of an emergency exit rim device (crash bar or panic bar) will permit escape through a fire door, however it must re-latch ...
The fire chief's sinking feeling only got worse when he learned that investigators believed Plote killed Melissa and their unborn child because he did not want to be a father — and then set the ...
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