Present day technology has overcome the security concern to a large extent by use of rolling frequency or sometimes called hopping code technology. In this every time a new frequency is used to open and close the door.
Mechanical PartThe mechanical part of the garage door opener is pretty simple. Mainly three types are used: chain drives, screw drives and belt drives. Chain drives are noisy but are the cheapest. Screw drives have a lead screw and nut system to open and close the door. They are a bit costly. The latest models use plastic liner on the tracks to reduce noise and increase the operation speed. Belt drives are the quietest and are comparatively costly. The mechanism also consists of a main spring that is the most important element of the system. Usually two types of springs are used linear expansion and torsional springs.
Garage Door Opener
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