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A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.
Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility.
The term window security may refer to any of a range of measures used to avoid unauthorized access through windows, and prevent crimes such as burglary and home invasions. Window security is used in commercial and government buildings, as well as in residential settings.
These guardhouses keep security guards comfortable as well as secure. [7] The first modern guardhouse was manufactured by Par-Kut International in 1954. In the 21st century, guardhouses have provided more options such as exterior floodlights, reflective bullet resistant glass, gun ports, elevated platforms, highly mobile trailer mounting, anti ...
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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.