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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.
The rack and pawl are both restricted to only linear movement (not shown). A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools.
The actual sliding door is a movable rectangular framed sheet of window glass that is mounted parallel to a similar and often fixed similarly framed neighboring glass partition. The movable panel slides in a fixed track usually, and in its own plane parallel to the neighboring stationary panel. A specialty form, for Washitsu or "Japanese-style ...
Crashed car. Vehicle extrication is the process of removing a patient from a vehicle who has been involved in a motor vehicle collision. [1] Patients who have not already exited a crashed vehicle may be medically (cannot exit a vehicle due to their injuries) or physically trapped [2] and may be pinned by wreckage or simply unable to exit a vehicle (ie because a door won't open).
Push and pull factors in migration according to Everett S. Lee (1917-2007) are categories that demographers use to analyze human migration from former areas to new host locations. Lee's model divides factors causing migrations into two groups of factors: push and pull. Push factors are things that are unfavourable about the home area that one ...
Door furniture (British and Australian English) or door hardware (North American English) refers to any of the items that are attached to a door or a drawer to enhance its functionality or appearance. Decorative door in Florence, Italy. Manual door closer. Use of a door handle in a hotel. Design of door furniture is an issue to disabled persons ...