| 摘要 |
PURPOSE:To open and close a window against heavy load when heavy load obstructing the opening and closing of the window is generated, and to prevent the application of excess force to window glass and a door when the window is opened and closed. CONSTITUTION:When window glass is brought to the state of heavy load, a normally-open type switch is closed, the switch is changed over so that the reference voltage of a potentiometer rises, and currents flowing through a motor are detected by a detecting resistor RL. Voltage at both ends of the detecting resistor RL and reference voltage are compared, a flip-flop 5 or 8 and a switching transistor 9 are left as they are brought to the state of operation, the motor is supplied continuously with currents, and a window is driven. Accordingly, window glass can be elevated and lowered smoothly on the overload of the window, thus simplifying circuit constitution. |
