An up-and-over door is often used in garages. Instead of hinges it has a mechanism, often counterbalanced or sprung, that allows it to be lifted so that it rests horizontally above the opening. Also known as an overhead door. A roller shutter is one variant of this type.
Automatic doors are powered open and closed either by power, spring, or both. There are several methods by which an automatic door is activated:
A sensor detects traffic is approaching. The purpose of the safety sensor is to prevent the door from colliding with an object in its path by stopping or slowing its motion. Sensors for automatic doors are generally fitted with safety sensors. A pressure sensor - e.g., a floor mat which reacts to the pressure of someone standing on it. An infrared curtain or beam which shines invisible light onto sensors; if someone or something blocks the beam the door is triggered open. A motion sensor which uses low-power microwave radar for the same effect.
A remote sensor (e.g. based on infrared or radio waves) can be triggered by a portable remote control, or is installed inside a vehicle. These are popular for garage doors.
A switch is operated manually, perhaps after security checks. This can be a push button switch or a swipe card.
The act of pushing or pulling the door triggers the open and close cycle. These are also known as power-assisted doors.
A self bolting door called because of its special hinges that permit to panel leaf making a lateral movement at the place of the bolt so that door itself becomes a giant bolt for better security result.
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