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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.
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 1910, Vonnegut Hardware Company began to sell the Von Duprin Safe Exit Device; not long after many public buildings in Indianapolis implemented the panic bar, setting standards that the rest of the nation too would soon follow. [5] Dupont announced his move to Florida in 1915, with an office in St. Petersburg's Central National Bank Building ...
A typical "handle set" is composed of the exterior handle, escutcheon, an independent deadbolt, and the interior package (knob or lever). On some doors the latch is incorporated into a hinged handle that releases when pulled on. See also: Doorknob – A knob or lever on an axle that is rotated to release the bolt; Crash bar or Panic bar; [3]
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 ...
Image credits: Laura Gustafson #5. We had a couch in the living room. But the living room was carpeted so I was not allowed to walk on the carpet. And thus I was not allowed to sit on the couch.
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