Patent ID: 6092338
Filing Date: 2000-07-25
Classification: E05F,E05Y,G05B

Abstract:
A barrier operator to move a movable barrier, other barrier operator comprising:a motive source having a movable member;a stationary station including a drive system having an input member and an output member, the input member being coupled to the movable member of the motive source; andfirst and second flexible members each having first and second end portions and an extending portion extending a length from the station, the first end portions of the flexible members being operatively coupled to the movable barrier, and the second end portions of the flexible members being fixedly attached to and wound around the output member of the station to a combined degree of at least two windings, the length of one of the extending portions of the first and second flexible members becoming shorter and the length of the other of the extending portions of the first and second flexible members becoming longer as the movable member of the motive source moves to move the movable barrier.