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1. (WO2017157469) ELEVATOR SAFETY SYSTEM

Pub. No.:    WO/2017/157469    International Application No.:    PCT/EP2016/056024
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Sat Mar 19 00:59:59 CET 2016
IPC: B66B 5/00
Applicants: OTIS ELEVATOR COMPANY
TEGTMEIER, Dirk, H.
Inventors: TEGTMEIER, Dirk, H.
HERKEL, Peter
Title: ELEVATOR SAFETY SYSTEM
Abstract:
An elevator safety system comprises: at least two sensors (14a, 14b, 15a, 15b, 16a, 16b), each of the sensors (14a, 14b, 15a, 15b, 16a, 16b) being configured for monitoring at least a portion of a hoistway (4) of an elevator system (2) and providing monitoring signals; a transformation unit (24a) which is configured for transforming the monitoring signals provided by at least one of the sensors (14a, 14b, 15a, 15b, 16a, 16b) and producing transformed signals corresponding to a common direction of vision; a comparison unit (24b) which is configured for comparing the at least two transformed signals and for generating a failure signal if a difference between the at least two transformed signals exceeds a predetermined threshold; and a detection unit (2c), which is configured for detecting a person or undesired item in at least one of the two transformed signals and for generating an alarm signal if a person or undesired item is detected.