×

Method for performing an alarm call in an elevator system

  • US 5,714,726 A
  • Filed: 08/16/1995
  • Issued: 02/03/1998
  • Est. Priority Date: 12/22/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for testing the operation of a elevator system, comprising the steps of:

  • continuously monitoring signals indicating functions of devices in the elevator system;

    determining if a malfunction has occurred in the elevator system based on the monitored signals including whether an elevator has stopped moving;

    storing the monitored signals in a memory;

    a change determining step determining if a change has taken place in the status of the monitored signal during a time period characteristic to the corresponding malfunction;

    transmitting a car call signal to a stopped elevator car, when the time period has lapsed and said change determining step determines that no change has taken place;

    determining if the stopped elevator car responds to the car call signal; and

    emitting a signal representing a malfunction in the elevator system if said determining step determines that the stopped elevator car did not respond to the car call signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×