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2. Crash bar - Wikipedia

   en.wikipedia.org/wiki/Crash_bar

   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.

3. Carl Prinzler - Wikipedia

   en.wikipedia.org/wiki/Carl_Prinzler

   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.

4. Emergency exit - Wikipedia

   en.wikipedia.org/wiki/Emergency_exit

   Emergency exit in Universitetet metro station in Stockholm. An emergency exit in a building or other structure is a special exit used during emergencies such as fires.The combined use of regular and emergency exits allows for faster evacuation, and emergency exits provide alternative means of evacuation if regular exits are inaccessible.

5. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   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 once released. (A fire door must not be "dogged" to disable its latch.)

6. Electric strike - Wikipedia

   en.wikipedia.org/wiki/Electric_strike

   Electric strikes for rim panic exit devices are sometimes, though not always, 'no cut' electric strikes - no cutting, in reference to a rim panic strike, means the strike is bolted to the surface of jamb without cutting into the frame or modifying it in any way (except for the drilling and tapping of mounting screw and/or anchoring pins).

7. Exit control lock - Wikipedia

   en.wikipedia.org/wiki/Exit_control_lock

   Usually, the door is locked with an emergency exit button next to it. Pushing the emergency exit button will unlock the door and set the shop's fire alarm off. This deters shoplifting because a person who unlocks the door in order to take an item out of the building when it is not an emergency may be reported to the police, with CCTV footage if ...