Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tapio Tyni0
Pekka Perälä0
Date of Patent
May 4, 2010
0Patent Application Number
124652210
Date Filed
May 13, 2009
0Patent Primary Examiner
Patent 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.
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