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Historically, such locks were intended for use at night-time, hence the name. [5] The keyless egress that they offer is a valuable fire safety measure, but may be a security risk if breaking a glass panel (usually in the door) or a nearby small window allows an intruder to reach the knob inside and open the door from the outside.
A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions.
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 Fire Safety Research Institute (FSRI) says closing your door at night could, in fact, save your life in the event of a fire. The institute has even come up with a fire safety program called ...
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Openable bars have been introduced to the market. [1] During the middle of the 1800s in the United Kingdom, glass started to be used in the ordinary shops, but wooden shutters were retained to protect the goods exposed. At about this time, metal grilles started to be used at night to allow passersby to view the goods on display.