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ELEVATOR RESCUE SYSTEM

  • US 20160280507A1
  • Filed: 02/24/2016
  • Published: 09/29/2016
  • Est. Priority Date: 03/23/2015
  • Status: Active Application
First Claim
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1. Elevator rescue system for moving an elevator car of an elevator in an emergency situation, which elevator includes an elevator motor acting on hoisting ropes by which the elevator car is suspended and/or moved, which elevator motor comprises at least one electro-mechanical brake and an encoder outputting a signal corresponding to its speed, which system comprisesa back-up power source,a jerk monitoring circuit connected to the encoder and comprising a memory for at least one first upper threshold value for the car acceleration and/or its time derivative,a brake feed circuit which is controlled by the jerk monitoring circuit,at least one release switch which is connected to the jerk monitoring circuit and/or to the brake feed circuit,in which system the operation of the release switch activates the brake feed circuit to release the brake, and initiates the jerk monitoring circuit to compare the car acceleration and/or its derivation as derived from the encoder signal with the stored first upper threshold value, whereby it forwards a control signal to the brake feed circuit to initiate/stop braking depending on the comparison result.

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