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Switch apparatus for vehicle

  • US 4,386,279 A
  • Filed: 03/25/1981
  • Issued: 05/31/1983
  • Est. Priority Date: 04/02/1980
  • Status: Expired due to Term
First Claim
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1. A switch apparatus for use in a vehicle comprising:

  • a signal transmitting unit disposed in a steering wheel provided with an electrical switch;

    a signal receiving unit disposed in the body of the vehicle; and

    a current path disposed in a rotation transmission mechanism supported in said vehicle body for rotatably supporting said steering wheel, said current path supplying a DC signal from said electrical switch to said signal receiving unit;

    wherein said signal transmitting unit includes a plurality of additional electrical switches, signal generating means for generating a signal having a frequency indicative of information provided by manipulation of a selected one of said additional electrical switches, signal superposing means for superposing the signal frequency generated from said signal generating means on said DC signal supplied by way of said current path, and voltage regulating means for generating a regulated voltage related to said DC signal and supplying it to said signal generating means; and

    wherein said signal receiving unit includes signal extracting means for extracting said signal frequency supplied by way of said current path in the relation superposed on said DC signal, and signal decoding means for decoding said extracted signal frequency.

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