This track aka the t rail guides and shields the chain screw or belt as it moves the.
Garage door opener drive mechanism.
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This type of drive system runs along the rail and wraps around a sprocket located on the top of the opener.
The first garage door opener remote controls were simple and consisted of a simple transmitter the remote and receiverwhich controlled the opener mechanism.
Belt drive garage door openers are almost similar to chain drive mechanisms but in this type of system a wide belt is used instead of a metal chain.
The belt ends are joined at the drive trolley with a threaded clip that can be adjusted to keep the belt tight.
The receiver would listen for the radio signal then open or close the garage depending on the door position.
It operates using a switch that activates the wide rubber belt which either pulls the trolley up a track to raise the door or pushes it down a track to lower the door.
Today s high strength drive belts will handle the weight loads of most single or double residential garage doors.
The transmitter would transmit on a designated frequency.