Balance control system for a movable barrier operator
AssigneeThe Chamberlain Group, Inc.
InventorsThomas A. Brookbank, James J. Fitzgibbon
Life of this patent
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Abstract
A balance control system comprises a motor, a transmission system providing connection between the motor and the door and adapted to move the door between a closed position and an open position located above the closed position, a counterbalance system to reduce power required to lift the door, an apparatus to generate first signal representing a force used to move the door from the closed position to the open position, and to generate a second signal representing a force used to move the door from the open position to the closed position, and a controller responsive to the first signal and to the second signal to indicate an imbalance of the door when a difference between the first signal and the second signal exceeds a predetermined threshold.
Claims12
A balance control system comprising:
- a motor;
- a transmission system providing connection between said motor and a garage door, and adapted to move the garage door between a closed position and an open position above the closed position;
- a counterbalance system to reduce power required of the motor to lift the garage door;
- an apparatus to generate an upward force measurement value representing an opening force required to move the garage door from said closed position to said open position, and to generate a downward force measurement value representing a closing force required to move the garage door from the open position to the closed position;
- and
- a controller which compares the upward force measurement value with the downward force measurement value and indicates an imbalance of the garage door when a difference between the upward force measurement value and the downward force measurement value exceeds a predetermined threshold.
Dependencies are inferred from the claim text.