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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.
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).
Frame and panel construction, also called rail and stile, is a woodworking technique often used in the making of doors, wainscoting, and other decorative features for cabinets, furniture, and homes. The basic idea is to capture a 'floating' panel within a sturdy frame, as opposed to techniques used in making a slab solid wood cabinet door or ...
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 ...
A door closer is a mechanical device that regulates the speed and action of a door ’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems.
Revolving door. A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. To use a revolving door, a person enters the enclosure between two of the doors and then moves continuously to the desired exit while keeping pace with the doors.
This is an accepted version of this page This is the latest accepted revision, reviewed on 7 September 2024. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including exterior doors of residential and commercial buildings, internal doors, cupboard ...