An electric garage door opener consists of a power unit and an electric motor, both attach to a track. A trolley connected to an arm that attaches to the top of the garage door slides back and forth on the track, thus opening and closing the garage door.


The trolley is guided along the track by a chain, belt, or screw that turns when the motor is operated. A quick-release mechanism is attached to the trolley to allow the garage door to be disconnected from the opener for manual operation during a power failure or in case of emergency.


The Different Types of Garage Door Openers
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Chamberlain WD822KD Whisper Drive 1/2-HP Belt Drive Garage Door Opener

Chamberlain WD822KD Whisper Drive 1/2-HP Belt Drive Garage Door O...

Category: (Home Improvement)

14 new, starting at $206.31

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Sears Craftsman LiftMaster Chamberlain Garage Door Opener Gear Kit - Part #41A2817

Sears Craftsman LiftMaster Chamberlain Garage Door Opener Gear Ki...

Category: (Home Improvement)

5 new, starting at $13.95

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Chamberlain PD210D Power Drive 1/2-Horsepower Security-Plus Chain-Drive Garage Door Opener, Black and White

Chamberlain PD210D Power Drive 1/2-Horsepower Security-Plus Chain...

Category: (Home Improvement)

1 new, starting at $152.74

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