| 摘要 |
<p>PURPOSE:To aim at simplification in electric wiring, by generating oscillation signals for information factors corresponding to operation of electric switches equipped in a steering gear side and transmitting the signals to car body side through overlaying them on direct current line so as to control many type electric equipments. CONSTITUTION:In a steering gear H held by a card body B through a rotation transmitting mechanism R, a open-close switch 5 and electric switches 1 (1a-1c) are provided and closing the open-close switch 5 rings an alarm 7 by use of direct current flowing through a direct current line 6. Also in the steering gear H, a transmitting circuit 2 is provided with the signal generating circuit 201 generating frequency code signals corresponding to the closing of the electric switches 1 and the overlay circuit 204 overlaying on the current line 6 by amplifying frequency code signals, etc. While in the car body side, a receiving circuit 3 is provided with the extraction circuit 301 extracting frequency code signals from the current line 6 and the decoding circuit 304 reading the extracted signals etc., and the corresponding electric equipment 4 is controlled.</p> |
