×

Controlled emergency stop apparatus for elevators

  • US 5,893,432 A
  • Filed: 12/31/1996
  • Issued: 04/13/1999
  • Est. Priority Date: 12/31/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for controlling an emergency stop of an elevator car in an elevator system, the elevator system including a DC drive motor coupled to the elevator car, a drive control connected between the DC drive motor and an electrical power supply, and an elevator control connected to the electrical power supply and to the drive control for controlling starting, running and stopping of the elevator car, the apparatus comprising:

  • a controlled emergency stop circuit (CESC) means having a power input adapted to be connected to an electrical power supply, an emergency elevator control power output adapted to be connected to an elevator control and an emergency drive control power output adapted to be connected to a DC drive motor;

    a sensor means in said CESC means connected to said power input for generating a reference signal representing a status of an electrical power supply connected to said power input;

    a DC electrical power storage means connected to said power input for receiving and storing electrical power from an electrical power supply connected to said power input;

    a control means connected to said sensor means for receiving said reference signal; and

    a switch means connected to said emergency drive control power output and adapted to be connected between the DC drive means and the drive control where by when input power is connected to the electrical power supply, said power output is connected to the elevator control, said control means responds to said reference signal representing normal operation of the electrical power supply to actuate said switch means to connect the drive control to the DC drive motor and, upon a failure of the electrical power supply, said control means responds to said reference signal to actuate said switch means to disconnect the drive control and connect said DC electrical power storage means to provide power to the DC drive motor, said DC electrical power storage means also supplying electrical power to the elevator control for controlling an emergency stop of an elevator car coupled to the drive motor at a predetermined deceleration rate.

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