Chain Drive Openers
As the term implies, chain drive openers work with a chain. Most garage door openers have a trolley system and one of the variations for the operation of this system is the chain drive guide. This is actually a chain, which makes circles along a rail with the help of gears. It's powered by the electric opener motor, which transfers power to the chain. At the opposite side of the rail, there is the trolley which is also connected with an arm attached on the door. As the chain moves, its movement is passed to the trolley and from there to the arm, which makes a small movement in order to pull the door. It then gains back its original position when the door returns back to its closing position.
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Chain drive openers work equally well with electricity, backup batteries or manual operation. The chain is actually very strong and this is why this system is ideal for heavy doors. Chain drive garage door openers are the most common option for most homeowners because apart from their power, they are also the most inexpensive choice. The disadvantage of chains is they make a lot of noise. Since, the chain is not sealed in any way and moves around sprockets, it makes a loud noise and would annoy those interested in a quieter operation. Chains need some lubrication and adjustment if sagging. They must not be too tight for avoidance of early wear and have a tensioner with one locking and one adjusting nut for easier maintenance.