Patent ID: 6025685
Filing Date: 2000-02-15
Classification: E05F,E05Y

Abstract:
A method of power-operating a movable gate member, the method comprising steps of:providing an electric motor;coupling the electric motor by a speed reduction drive to the movable gate to move the gate between opened and closed positions;operating the electric motor to move the gate toward a desired limit position;as the gate moves toward the desired limit position, shutting off the electric motor;measuring the deviation between the desired limit position and the position at which the gate actually stops after the electric motor is shut off;calculating a correction factor that is a function of the deviation measurement;after calculating the correction factor, applying the correction factor to shut off the electric motor during a subsequent operation of moving the gate toward the desired limit position in order to reduce the deviation between the desired limit position and the position at which the gate actually stops; andsensing ambient temperature, compiling a historical data base of deviation measurements, as calculated between a predefined limit position and the position at which the gate actually stops on each occasion, versus ambient temperature on each occasion, and using the data base to provide a further correction factor applied in shutting off the electric motor during an operation moving the gate toward the desired limit position.