Motor-driven window lifter with anti-nipping device for a vehicle

摘要

A motor-driven window lifter for a motor vehicle with electronic means to protect against entrapment of body parts in the window opening with at least one spring in the line of force between the drive unit (such as an electric motor or gear) and the window pane is characterized in that the blocking force of the spring corresponds at a maximum to the sum of the displacement force anticipated and the admissible entrapment force and that the spring characteristic when an initial load is exceeded has a decreasing, preferably negative curve, such that the spring enables a relatively long path of the drive unit when the initial load is exceeded.