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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.
This delay reserves time for security personnel to get to the door before the door opens. The lock will also release if there is a fire alarm or power failure, but otherwise these locks hold the exit doors shut. Exit control systems can include a "request to exit detector" such as a pushbutton that opens the exit, if exit requests are enabled.
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Lock boxes can also be used for the general storage and security of keys for access by family members or other affiliated groups. Traditional real estate lock boxes are secured either with a physical key, a security code, or a swipe card, [ 1 ] while newer wireless electronic versions may operate in tandem with mobile devices, incorporating ...
An Oklahoma school district is using facial recognition on security cameras. Campus police plan to use the system to track a short list of people prohibited from entering the building.
A door security restrictor, aka a door swing bar lock, is a newer device intended to replace door chains. It consists of a U-shaped bar that attaches to a hinge on the doorframe, and a knob on the door. The bar swings over the knob to restrict the full opening of the door. Door bars are easier to use, and can be made of much sturdier material ...
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