Patent ID: 6107765
Filing Date: 2000-08-22
Classification: E05F,E05Y,G05B,H02H

Abstract:
A movable barrier operator comprising:an electric motor;a switch operatively coupled to the electric motor for commanding the electric motor to move;a switch for commanding a learn mode;a transmission connected to the electric motor to be driven thereby and for connection to a movable barrier to be moved;means for detecting a quantitative indication of position of the movable barrier;a pass point signal generator for producing a pass point signal indicative of the barrier moving past a location fixed with respect to a barrier frame;means for correcting the quantitative indication of position according to the pass point signal;means for storing a force set point; andmeans responsive to the learn mode and to the quantitative indication of position for detecting the force applied to the movable barrier and for changing the force set point when the force needed to move the barrier is greater than the force set point.