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Security systems employing an electronic lock and key apparatus

  • US 4,315,247 A
  • Filed: 08/13/1979
  • Issued: 02/09/1982
  • Est. Priority Date: 08/13/1979
  • Status: Expired due to Term
First Claim
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1. An electronic lock and key system for activating a control mechanism to permit entry to a secured area, comprising:

  • (a) key means having located thereon a selected one of a plurality of unique digital codes, said key means having said selected code impressed thereon with selected bits of said code arranged in a plurality of information bearing tracks, said key means further including a clock track having a predetermined number of bits located thereon and indicative of a storage sequence, with said clock track positioned centrally on said key means and having number of information bearing tracks above and below said clock track,(b) receptacle means for receiving said key means and for providing an electrical signal indicative of said selected code, said receptacle means including clock detecting means responsive to said clock bits for providing a timing signal indicative of the position of each bit in each of said information bearing tracks,(c) processor means including a memory coupled to said clock means and operative in a first storage mode responsive to said signal for storing said selected code upon insertion of said key means in said receptacle during said first mode in predetermined locations according to said clock bits and operative in a second mode responsive to said timing signal for comparing each bit as stored in said location only during the clock bit indicative of the position of that bit as stored for thereafter comparing said selected code as manifested by said electrical signal with said code as stored to provide a comparison between the same, and(d) means providing a signal for activating said control mechanism upon a favorable comparison.

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