Remote switch-sensing system

  • US 4,588,978 A
  • Filed: 06/21/1984
  • Issued: 05/13/1986
  • Est. Priority Date: 06/21/1984
  • Status: Expired due to Fees
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First Claim
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1. A system for monitoring an open/closed condition switch carried on one of a pair of remote members, said system comprisinga transmitter mounted on the other remote member, including a transmitter coil which is positioned adjacent the one remote member, and means for coupling an alternating current to said coil, such that a selected-frequency electromagnetic field is generated thereby,an inductor circuit carried on the one remote member, including an inductor coil operatively positioned adjacent the transmitter coil during operation of the system, and a switch element including such open/closed condition switch and circuit components operatively connecting the switch to the inductor-circuit coil to vary, according to the condition of the switch, the characteristics of a signal induced in the circuit by magnetic coupling between the transmitter and circuit coils, when the transmitter is generating such selected-frequency field,a receiver mounted on the other remote member, including a coil positioned for magnetic coupling to the inductor-circuit coil during operation of the system, and a monitoring circuit for detecting the signal response voltage in the inductor circuit according to a signal produced in the receiver coil by inductive coupling with the inductor circuit coil, andan enhancer circuit carried on the one remote member, including an inductor coil magnetically coupled to the inductor-circuit coil, and circuit means for producing resonance characteristics in the enhancer circuit which act to increase the signal voltage produced in the receiver circuit coil at a selected signal frequency, over that producible in the receiver circuit coil in the absence of the enhancer circuit.

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