| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a control cable for moving up/down a carrier plate from being broken when a foreign matter is caught between a guide rail and a roller and the control cable is thereby overloaded while a lifting and lowering device for a window screen is in operation. <P>SOLUTION: A PTC element 52 and a resistor R1 of a low resistance value are connected in series with a motor 24 for moving up/down a window screen. When a foreign matter such as a pebble is caught between a guide rail and a roller or the like while the window screen, that is, a carrier plate is in operation, the movement of the carrier plate becomes unsmooth, and an overcurrent is passed through the motor 24. When the temperature of the PTC element 52 becomes equal to or higher than a predetermined value due to this overcurrent, the circuit is broken to interrupt power supply to the motor 24. <P>COPYRIGHT: (C)2007,JPO&INPIT |
