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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.
A mullion is a vertical element that forms a division between units of a window or screen, or is used decoratively. [1] It is also often used as a division between double doors. When dividing adjacent window units its primary purpose is a rigid support to the glazing of the window. Its secondary purpose is to provide structural support to an ...
Muntins divide a single window sash or casement into a grid system of small panes of glass, called "lights" or "lites". In UK use, a muntin is a vertical member in timber panelling or a door separating two panels. Windows with "true divided lights" make use of thin muntins, typically 1/2" to 7/8" wide in residential windows, positioned between ...
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.
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 ...
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.
A distinctive feature of Windows Aero showing "glass-like" window borders on Windows 7. Windows Aero (a backronym for Authentic, Energetic, Reflective, and Open[ 1 ][ 2 ]) is the design language introduced in the Microsoft Windows Vista operating system. The changes introduced by Windows Aero encompassed many elements of the Windows interface ...
A door frame, window frame, door surround, window surround, or niche surround is the architectural frame around an aperture such as a door or window. This may consist of separate pieces including jambs (side pieces) and lintel (top piece). A doorway may include side lights and/or a transom beside or above the door; the framing around the door ...