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US 10,118,798 B2Granted
Monitoring condition of safety system for elevator
AssigneeKone Corporation
InventorAri Kattainen
Life of this patent
Estimating the term…
Abstract
According to few examples a safety system, a method and a computer program for an elevator safety system is provided. A first switch configured to detect a first position of a safety device of an elevator. A second switch configured to detect a second position of the safety device. A controller configured to monitor a change of a state of the first switch and a change of a state of the second switch.
Claims11
A safety system of an elevator, comprising:
- a safety device provided in an elevator shaft of the elevator and configured to establish a temporary safety space during a maintenance mode of the elevator by limiting travel of an elevator car when in a fully extended position, the safety device including:
- a first switch that is configured to detect a first end position of the safety device, wherein in the first end position, the safety device is in a fully retracted position;
- and
- a second switch, different from the first switch, wherein the second switch is configured to detect a second end position of the safety device, wherein in the second end position, the safety device is in the fully extended position;
- and
- a controller configured to:
- monitor a change of a state of the first switch and a change of a state of the second switch,
- monitor a sequence or an order of the changes of the states, wherein the sequence or the order is desired or non-desired, and
- block a drive of the elevator if the sequence or the order is non-desired.
6 more elements
A method of a safety system of an elevator, comprising the steps of:
- providing a safety device in an elevator shaft of the elevator, wherein the safety device establishes a temporary safety space during a maintenance mode of the elevator by limiting travel of an elevator car when in a fully extended position, the safety device including:
- a first switch that detects a first end position of the safety device, wherein in the first end position, the safety device is in a fully retracted position;
- and
- a second switch, different from the first switch, that detects a second end position of the safety device, wherein in the second end position, the safety device is in the fully extended position;
- monitoring, by a controller, a change of a state of the first switch and a change of a state of the second switch;
- monitoring, by the controller, a sequence or an order of the changes of the states, wherein the sequence or the order is desired or non-desired;
- and
- blocking, by the controller, a drive of the elevator if the sequence or the order is non-desired.
5 more elements
Dependencies are inferred from the claim text.