Patent ID: 6883275
Filing Date: 2005-04-26
Classification: E05F,E05Y

Abstract:
1. A system comprising: a linkage, pivotally attached to a rigid structure; a compressible strut, pivotally connected to both the linkage and one of a gate and a door pivotally attached to the rigid structure; means for measuring an angle between the one of the gate and the door; and the rigid structure at their pivotal connection; control means, operatively connected to the angle measuring means, for receiving the measured angle, for determining a start of a transition between first and second phases of the descent of a one of the gate and the door, and for selecting a descent profile from a table based on the measured angle at which the transition between the first and second phases occurs, and for controlling the angle between the linkage and the rigid structure during the second phase of the descent based on the selected profile.