Patent ID: 7132813
Filing Date: 2006-11-07
Classification: E05F,E05Y,H02H

Abstract:
1. A method of operating a barrier movement operator for moving a barrier between open and closed positions comprising: receiving a first request to move a barrier; first measuring the actual force required to move the barrier to detect an obstruction to barrier movement by comparing the measured actual force and a first predetermined force threshold; responsive to the detection of an obstruction, changing the travel of the barrier and modifying the operation of the barrier movement operator, by permitting the use of a higher force threshold in future measuring steps; receiving a second request to move the barrier; second measuring the actual force required to move the barrier to detect an obstruction to barrier movement by comparing the measured actual force with the higher force threshold; and reversing the modification of the force threshold upon completion of the barrier movement in response to the second request without detecting an obstruction.