Patent ID: 6194855
Filing Date: 2001-02-27
Classification: B60J,E05F,E05Y,G05B,G05D

Abstract:
A displacement drive having an obstruction prevention function for a movable part, comprising:a first arrangement for stopping one of a rotation speed of the displacement drive and a velocity of the displacement drive in response to an obstruction in the path of the movable part; anda second arrangement for reducing according to a predefined functional relationship, before a closed position of the movable part is reached and within the specific displacement range, one of the rotation speed and an output of the displacement drive to a corresponding one of a minimum rotation speed and a minimum output, wherein:the reduction to one of the minimum rotation speed and the minimum output is performed within a specific position range,one of the minimum rotation speed and the minimum output is achieved at a specific position before the closed position of the movable part, andone of the minimum rotation speed and the minimum output is substantially constant for a finite period of time prior to the movable part reaching the closed position.