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Status monitoring system for an electronic lock

  • US 5,410,301 A
  • Filed: 11/24/1992
  • Issued: 04/25/1995
  • Est. Priority Date: 11/24/1992
  • Status: Expired due to Fees
First Claim
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1. A monitored electronic combination lock system comprising:

  • an electronic combination lock;

    said lock comprising a microprocessor for controlling operations of said lock;

    said lock further comprising a generator for providing electrical power and pulses to said microprocessor;

    a bolt having an extended position and a withdrawn position;

    an enabling means for enabling withdrawal of said bolt, controlled by said microprocessor to enable the withdrawal of said bolt to unlock said lock;

    a means for monitoring said lock comprising a monitoring station;

    a plurality of electrical conductors extending from said lock to said monitoring station;

    at least a first one of said electrical conductors connected to electrical ground;

    a second one of said plurality of electrical conductors connecting said lock and said monitoring station and maintained at a known voltage potential;

    an interface connected to both said first one and said second one of said plurality of electrical conductors;

    a shorting conductor connectable at said interface with said second one and said first one of said plurality of electrical conductors for enabling combination changes;

    a third one of said plurality of electrical conductors connected to conduct an activating electrical signal provided to said enabling means to said monitoring station;

    a fourth one of said plurality of said electrical conductors connected to a position responsive detector means for detecting a position of said bolt and said monitor station for providing electrical signals indicative of the positions of said bolt;

    said monitoring station comprising means connected to and for monitoring each of said plurality of conductors for electrical signals indicating a state of a plurality of components of said lock;

    a fifth one of said plurality of electrical conductors extending from said monitoring station and connected to said interface, said fifth one of said plurality of electrical conductors connected to a logic circuit for determining a presence of said shorting conductor at said interface extending between said fifth one and said second one of said plurality of electrical conductors; and

    said monitoring station comprising an authorization means for authorizing the use of said shorting conductor when said shorting conductor is connected to said second and said fifth of said conductors, thereby conditioning said lock to accept a change in operating parameters.

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