The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2008
Filed:
Apr. 13, 2007
Nils-robert Roschier, Vantaa, FI;
Olof Ahlskog, Hyvinkää, FI;
Nils-Robert Roschier, Vantaa, FI;
Olof Ahlskog, Hyvinkää, FI;
Kone Corporation, Helsinki, FI;
Abstract
The invention concerns a method and a system for ensuring the operation of the safety circuit of an elevator or escalator, said safety circuit containing safety contacts () connected in series with a contactor (). In the method, the largest bypass current coming to the contactor in a fault situation is defined, a testing device () is connected in series with the safety circuit, said testing device containing at least one resistor (), which is used to produce a desired test current that is larger than the largest bypass current, and the neutral point () of the safety circuit is shifted if the contactor () remains energized by the aforesaid test current.