Elevator safety circuit monitoring system and method
US7503435B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2007 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Sep 14, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B13/22
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The invention concerns a method and a system for monitoring the operation of the safety circuit of an elevator, said safety circuit containing safety switches connected in series with a contactor and a static circuit. In the method, the current flowing in the safety circuit is measured and the state of the safety circuit is determined on the basis of the measured current. The measurement of the safety circuit current is preferably performed without a galvanic connection to the safety circuit. The state of the safety circuit is determined on the basis of the magnitude of the measured current, from which the positions of the safety switches during the current measurement can be inferred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.