Garage door openers that use an operator rail turn a chain or belt. This piece connects to a trolley, which is also called a carriage. The trolley pulls the opener arm to lift the garage door, and pushes the arm to close the door. A piece of rope typically hangs down from the trolley. This is used to disengage and reengage the opener. When the opener is disengaged, pressing the wall button or the button on your remote will run the opener and turn the belt or chain. It will not, however, open or closed your door.
The idrive garage door opener is a now discontinued space saving, torsion drive model from Wayne Dalton garage door openers. Torsion drive openers attach directly to the torsion shaft, eliminating the need to mount a box on the ceiling with a track leading to the garage door. No more belts, chains or screw drives, resulting in an additional six or eight inches of ceiling clearance.
Hoist style operators include a floor level chain hoist to ease manual operation in an emergency or power outage. The operators are typically mounted to the wall when used with larger sectional overhead doors with vertical or high lift and mounted to the wall or the front of the hood when used with rolling doors and grilles. H operators are attached to the door jackshaft to indirectly drive the door.
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