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US 2019/0210834 A1Published application
Door rail monitoring
AssigneeNippon Otis Elevator Company
InventorsShingo Matsuki, Seietsu Wada, Kazuyoshi Yoshida, Tatsuya Sukimoto, Takahiro Kakigi, Kengo Kochi
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Abstract
According to one embodiment, a method for monitoring a door rail of an elevator system is provided which comprises operating the elevator system to at least partially open a door, and to close the door at a slow speed, detecting that a door switch is closed and sending a signal when the time it takes for the door switch to close is over a predetermined value. The method for monitoring may be periodically commanded by an elevator control system.
Claims18
A method for monitoring a door rail of an elevator system, comprising:
- operating the elevator system to at least partially open a door, and to close the door at a slow speed;
- detecting that a door switch is closed;
- and
- sending a signal when the time it takes for the door switch to close is over a predetermined value.
1 more element
Dependencies are inferred from the claim text.