Power window device with safety detector and control override

Claim 1

In a power window device including a drive motor and a window pane moved up and down by the drive motor, and adapted to detect that a foreign matter or obstacle is sandwiched between the upper margin of the windowpane and an opposed window frame during upward movement of the windowpane, an improvement comprising: a sensor means monitoring a motor characteristic of said motor; a comparator means comparing a present value and a given time preceding value of the motor characteristic monitored by said sensor means; a detection signal output means producing a detection signal when deviation of the motor characteristic resulting from the comparison in said comparator means exceeds a predetermined value; a switching means responsive to said detection signal to invert the movement direction of said windowpane by said drive motor; and a control means activated to prohibit the inversion of the windowpane movement for a predetermined time.