An elevator moves through a hoistway with one or more sensors positioned so that they pass by one or more targets that are in fixed positions relative to the hoistway. As they pass, an inductive current is generated, giving the elevator's control circuitry precise information as to the vertical position of the elevator car. The control system adjusts the raising and/or lowering of the elevator car based on that position information and any discrepancy between it and the supposed position at which the control system had believed the car was. Discrepancies are accumulated over time as an indication of cable stretch, and when the stretch exceeds a particular threshold, an alarm is raised for maintenance. The control system also defines a “door zone” around each landing where, based on the precise height measurement achieved herein, it is safe under the circumstances to open the doors of the car.


    Access

    Download


    Export, share and cite



    Title :

    Absolute position door zone device


    Contributors:

    Publication date :

    2017-02-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66B Aufzüge , ELEVATORS



    Absolute Position Door Zone Device

    HUFF RANDOLPH / DELISO ANDREW | European Patent Office | 2015

    Free access

    ABSOLUTE POSITION DOOR ZONE DEVICE

    HUFF RANDOLPH / DELISO ANDREW | European Patent Office | 2018

    Free access

    DOOR POSITION DETECTION DEVICE

    DOMON TATSUSHI | European Patent Office | 2016

    Free access

    VEHICLE DOOR POSITION DETECTION DEVICE

    YAMASHITA SATOSHI / NAKAJIMA HIDEO / NAKAJIMA HIDETO | European Patent Office | 2019

    Free access