Glossary - Chamberlain RJO20 Manual

Preparation
(continued)

Glossary

Here are some basic terms you may encounter as you prepare and install your garage door opener.
Term
Bearing Plate
Cable Tension
Monitor
Door Seal
Drum
Extension Springs
High Lift
Sectional Door
Roller
Safety Reversing
Sensor
Torsion Springs
Torsion Bar
Track
Defi nition
Acts as a support for the torsion bar. The bearing and mounting plate are typically located
above the garage door.
The cable tension monitor detects any slack in the garage door cables. Failure to properly
install the cable tension monitor may cause the cables to be thrown and may result in a
hazardous situation. (Not shown below)
The door seal is located at the bottom of the door and helps to keep outdoor elements from
entering the garage.
Drums are round, grooved spools on the torsion bar that keep door cables orderly.
Extension springs are NOT compatible with this opener. Extension springs are typically
mounted along the horizontal section of the track and extend from the front of the door
opening to the back hang. The springs are intended to make a door lighter so you can easily
open and close the door by hand.
A type of garage door constructed with multiple panels that slide along a track inside the
garage. The track runs vertically up the wall beyond the top of the door opening several
inches before encountering the curve in the track. The extended distance above the top of the
garage door determines the amount of a high lift.
Small wheels which allow the door to move up and down the track.
The safety reversing sensors are a set of sensor eyes that detect obstructions in the path of
the garage door. If an obstruction is found, the sensors tell the door to reverse direction.
(Not shown below)
A torsion spring is a type of spring that counter balances the garage door. The torsion spring is
located above the door on the torsion bar. The springs are intended to make a door lighter so
you can easily open and close the door by hand. Consult a trained door systems technician if
you need the springs adjusted or replaced.
A torsion bar is a horizontal metal bar mounted above the garage door. The torsion springs
are located on the torsion bar. Most torsion bars are hollow, while some are solid. Some
solid torsion bars may have a groove called a keyway that runs the length of the bar.
Torsion bar
Electrical
outlet
Floor
Track
Center bearing
plate
Sectional door
Hinge
Roller
Door seal -
3
bottom of door
Drum
Bearing
plate
Torsion
springs