Condition monitoring method
US7708118B2 · kind B2 · utility
8Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 2009 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | May 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3274
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Method for the condition monitoring of the safety switches of the safety circuit of an elevator. Inferences can be made about the condition of a safety switch by measuring and examining the current of the safety circuit of the elevator after the state of the safety circuit has changed. The current signal is filtered, after which the amount of interference caused by contact malfunctions of the switch is determined from it. Based on the amount of interference it is possible to determine in what condition the switch is.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.