Lift Door Locking System Position Control
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Solution Overview
Problem
Existing locking systems for lift doors are mechanically complex and risk passenger safety when the lift car is not at floor level, as they can be opened inadvertently, potentially leading to injury or falling into the shaft.
Innovation Solution
A simplified locking system using an actuator-controlled device that transfers between locked and unlocked states based on the interaction between a reference element and a counter element, which are tuned to ensure safe positioning of the lift car relative to the shaft door, utilizing sensors to detect mechanical, electrical, magnetic, acoustic, or optical interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical locking system with driver skids and coupling rollers is used to enable joint opening of car door and shaft door, then the door opening function is achieved, but the device complexity increases and passenger safety is compromised
Solution Approach 1:
The patent extracts the safety control function from the mechanical locking mechanism itself. Instead of relying on the mechanical interaction between driver skids and coupling rollers to control door opening, the invention introduces a separate control device that monitors lift position and actively controls the locking device, thereby simplifying the mechanical structure while maintaining safety.
Solution Approach 2:
The patent introduces a control device as an intermediary between the lift position sensing and the locking mechanism. This control device receives signals from sensors about lift position and actively controls the locking device state, mediating between the mechanical elements and the safety requirement without adding mechanical complexity.
2Ease of operation
If the locking device is mechanically coupled to the door opening mechanism, then the door can be opened, but the risk of inadvertent opening increases when the lift is not at floor level
Solution Approach 1:
The control device performs preliminary action by monitoring the lift position continuously and proactively controlling the locking device state before any door opening attempt occurs. The locking device is only unlocked when the control device confirms the lift is at a valid floor level, preventing inadvertent opening before it can happen.
Solution Approach 2:
The patent implements feedback control where sensors continuously monitor lift position and provide signals to the control device, which then adjusts the locking device state accordingly. This closed-loop feedback ensures the door can only be opened when safety conditions are met, reliably preventing inadvertent opening.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures safe operation by preventing accidental opening of lift doors when the lift car is not at the correct level, reducing mechanical complexity and enhancing safety by using existing components of the lift's coupling device as reference and counter elements, thereby reducing the risk of injury and maintaining stability in both locked and unlocked states without continuous energy supply.
Implementation Method 1
interaction between reference element and counter element can, for example, be mechanical, in which case the reference element exerts a specific force on the counter element or moves the counter element by a prescribed distance
Implementation Method 2
reference element and counter element can, for example, also enter into interaction with one another electrically, in particular inductively or magnetically
Implementation Method 3
reference element and counter element can, for example, also enter into interaction with one another electrically, in particular inductively or magnetically
Implementation Method 4
reference element and counter element can also enter into interaction with one another acoustically
Implementation Method 5
reference element and counter element can also enter into interaction with one another optically
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A locking system for a lift door, in particular a car door (5) of a lift car (1) and/or a shaft door, comprises a locking device which in an unlocked state enables opening of the lift door, and in a locked state restricts, in particular prevents opening of the lift door; a reference element (18); a counter element (15.1; 152) which interacts with the reference element (18), in particular mechanically, electrically, magnetically, acoustically and/or optically, in a prescribed measure when the lift car (1) is located in a permissible position relative to a shaft door; a sensor (20) for outputting a preferably electrical signal when the reference element and the counter element (15.1; 152) are interacting with one another; and a control device for transferring the locking device from the locked state into the unlocked state as a function of the signal, the reference element (18) preferably being arranged on the shaft door.