Balanced Door Diagram. Install only on a properly operating and balanced door. In this image you will find door roller guide door and frame material semi automatic hold open hinge pivot assembly door top pivot check and guide channel assembly in it.
300mm to an internal or external corner. Install the control station far enough from the door to prevent the user from coming in contact with the door while. W is the cars weight r 1.
A properly balanced door will stay at any point of its travel while being supported entirely by its springs.
For most homeowners a torsion spring will last much longer than the alternative extension spring and provides these additional advantages. A properly balanced door will open slowly from a 34 open position close slowly from a 34 closed position and remain still at a 12 open position. Air resistance put simply. In a balanced door the door panel rotates around a rolling pivot in an elliptical path to provide the widest possible opening with the smallest swing arc see diagram below.