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Electronic detection systems and methods

  • US 4,471,343 A
  • Filed: 09/02/1981
  • Issued: 09/11/1984
  • Est. Priority Date: 12/27/1977
  • Status: Expired due to Fees
First Claim
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1. An automatically controlled switching system comprising:

  • (a) first means for generating short wave radiation,(b) means for transmitting said short wave radiation as an energy field in the vicinity of said first means,(c) second means including a portable circuit means for receiving said short wave radiation and(d) third means for generating a control signal when said second means is within a given short range of said transmitting means,(e) first switch means having a control input from said third means for receiving said control signal,(f) said first switch means having a control input from said third means for receiving said control signal, said first switch means adapted to become activated upon receipt of said control signal,(g) second switch means,(h) key operated means for activating said second switch means to close,(i) a power supply connected to said second switch means, and(j) an output circuit connected to receive electrical energy from said power supply when said first switch means is activated by said control signal from said third means and said second switch means is closed by said key operated means.

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