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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. Door furniture - Wikipedia

   en.wikipedia.org/wiki/Door_furniture

   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 ...

4. Carl Prinzler - Wikipedia

   en.wikipedia.org/wiki/Carl_Prinzler

   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 ...

5. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   www.aol.com/news

   Get breaking news and the latest headlines on business, entertainment, politics, world news, tech, sports, videos and much more from AOL

6. Fire door - Wikipedia

   en.wikipedia.org/wiki/Fire_door

   The intumescent and smoke-seal bounding of fire doors should be routinely checked, as should the action of the door closer and latch. Some fire doors are held open by an electromagnet, which is typically wired to a fire alarm system. If the power fails or the fire alarm is activated, the coil is de-energized, and the door closes.

7. United Airlines Flight 811 - Wikipedia

   en.wikipedia.org/wiki/United_Airlines_Flight_811

   The cargo door was recovered by manned deep-sea submersible Sea Cliff. On September 26 and October 1, 1990, two halves of Flight 811's cargo door were recovered by the manned deep-sea submersible Sea Cliff from the Pacific Ocean from 14,100 feet (4,300 m) below the ocean surface. The cargo door had fractured lengthwise across the center.