Saturday, March 21, 2009

57. MECHANISM OF UP AND OVER DOORS

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.Automatic doors are powered open and closed either by power, spring, or both. There are several methods by which an automatic door is activated


Mechanism of the sliding door of an elevatorA sensor detects traffic is approaching. Sensors for automatic doors are generally 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. OthersAn 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.


Automatic doors are powered open and closed either by power, spring, or both. There are several methods by which an automatic door is activated OthersAn 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.

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