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Remote elevator monitoring system

  • US 4,568,909 A
  • Filed: 12/19/1983
  • Issued: 02/04/1986
  • Est. Priority Date: 12/19/1983
  • Status: Expired due to Term
First Claim
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1. Apparatus for use with an associated centrally located service office for automatically detecting various elevator system malfunctions whenever they occur in a plurality of operating elevator systems located in a corresponding plurality of remote buildings by continually monitoring discrete elevator system parameter signals indicative of the states of selected parameters in the operating elevator systems, each apparatus installed in each remote building comprising:

  • elevator system monitor means, responsive, both before and after the occurrence of any malfunctions, to the discrete parameter signals associated with its building'"'"'s elevator system, each having signal processor means including memory means for storing signals including resident signals grouped in equations which predefine combinations of selected discrete parameter signals in specified states and which equations, when satisfied, are each indicative of the occurrence of one of the various elevator system malfunctions which may occur in an operating elevator system, said signal processor means sampling and storing in said memory means successive sampled values of the discrete parameter signals for comparing each present sampled value with a preceding sampled value for detecting a state change therebetween, said signal processor means identifying, in the presence of each such state change, the one or more of said equations that have become satisfied as a result of said state change, said signal processor means providing a message signal for each occurrence of said satisfied equations; and

    communication element means, responsive to its system'"'"'s message signals for initiating transmission of said system'"'"'s message signals to the associated centrally located service office.

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