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1. (WO2018198243) COUNTERWEIGHT DERAILMENT DETECTOR FOR ELEVATORS

Pub. No.:    WO/2018/198243    International Application No.:    PCT/JP2017/016606
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Thu Apr 27 01:59:59 CEST 2017
IPC: B66B 7/02
B66B 5/02
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: MIYAZAKI, Yoshiko
宮▲崎▼ 由子
Title: COUNTERWEIGHT DERAILMENT DETECTOR FOR ELEVATORS
Abstract:
This counterweight derailment detector for elevators comprises: a wire suspended parallel to the guiderail of a counterweight; a tubular member with an arm portion connected to the counterweight and having the wire penetrating vertically therethrough; an object to be detected connected to the lower end of the wire; a photoelectric sensor provided on a fixed surface so as to face the underside of the object to be detected, and which measures the distance to the object to be detected; a detection circuit electrically connected to the photoelectric sensor; and an interrupting circuit. The detection circuit detects that the counterweight is off the guiderail on the basis of the distance between the photoelectric sensor and the object to be detected. When the detection circuit detects that the counterweight is off the guiderail, the interrupting circuit stops the power supply to the I/O board of an elevator control board, halting the elevator and preventing reactivation thereof.