Upmost Landing Door Lock Release for Low-Headroom Elevators
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Solution Overview
Problem
Elevators with low headroom face issues where the upmost landing door does not open when stopped by the service limit device, hindering maintenance and evacuation, especially in No Head Room (NHR) elevators.
Innovation Solution
An actuator is activated by the service limit device to open the lock of the upmost landing door, connected via mechanical, electrical, wireless, or optical means, ensuring safe access for maintenance and evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the service limit device stops the elevator car at a level below the upmost landing door, then safe working space is provided for inspection and maintenance personnel, but the upmost landing door cannot be opened
Solution Approach 1:
The actuator is activated in advance by the service limit device to open the lock of the upmost landing door before maintenance personnel need to access it, ensuring the door is already unlocked when the car stops at the safe working level
Solution Approach 2:
An actuator serves as an intermediary component between the service limit device and the door lock mechanism, translating the service limit device activation into lock opening action, thereby decoupling the safety function from the door opening function
2Reliability
If the service limit device stops the elevator car below the upmost landing door, then safe working space is provided, but passenger evacuation through the upmost landing door is prevented
Solution Approach 1:
The lock is opened in advance by the actuator when the service limit device is activated, ensuring that if the car stops at the safe working level, the upmost landing door is already unlocked and ready for passenger evacuation if needed
Solution Approach 2:
The service limit device automatically triggers the actuator to open the lock without requiring manual intervention, allowing the system to self-service both safety and evacuation needs simultaneously
Data Source
AI summary
An arrangement for controlling a lock of an upmost landing door of an elevator, an elevator and a method. The arrangement comprises an actuator arranged to be activated in consequence of activation of a service limit device of the elevator, the actuator being connected to the lock of the upmost landing door, and said activation of the actuator arranged to open said lock.