Balance control system for a movable barrier operator

Details Balance control system for a movable barrier operator Balance control system for a movable barrier operator

2007-08-28

2007-08-28

Redman, Jerry (Department: 3634)

Movable or removable closures

Processes

C049S197000

Reexamination Certificate

active

10967469

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.

REFERENCES:
patent: 5929580 (1999-07-01), Mullet et al.
patent: 6118243 (2000-09-01), Reed et al.
patent: 6161438 (2000-12-01), Mullet et al.
patent: 6326751 (2001-12-01), Mullet et al.
patent: 6605910 (2003-08-01), Mullet et al.
patent: 6696806 (2004-02-01), Study et al.
patent: 2001/0024095 (2001-09-01), Fitzgibbon et al.

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