Patent ID: 6347482
Filing Date: 2002-02-19
Classification: E05F,E05Y,H02H

Abstract:
A safety device for power windows in which a driving motor is operated to open and close a windowpane of a vehicle, and in which the position of the windowpane is detected so as to safely control catching of a foreign object between the windowpane and a window frame, comprising:a position sensor for detecting a rotational angular position of the driving motor; means for detecting the position of the windowpane based on an output from said position sensor; and means for safely controlling catching of a foreign object in the window-pane and the window frame based on an output of said position detecting means, wherein said position sensor is a potentiosensor, said potentiosensor comprising: a resistance track comprising a circular electric resistor pattern; and conductive brushes rotating relative to said resistance track as the driving motor is driven and contacting said resistance track, wherein said resistance track includes electrodes at two diametrically opposed points on the circumference of said resistance track, and further wherein movement of each one of said conductive brushes results in a division of resistance between said electrodes.