Elevator Landing Door Unlocking Mechanism
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Solution Overview
Problem
Elevator shaft door unlocking mechanisms are complex due to the integration of energy storage devices and unlocking cables, leading to a cumbersome design.
Innovation Solution
A simplified design for unlocking elevator shaft doors, where an energy storage device coupled to a resilient element moves the locking bar from its locked to unlocked position, allowing the door to be opened manually by a service technician, even in the absence of power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an unlocking cable is fixed to the locking bar and extends into the lower door region for manual unlocking, then the door can be unlocked from the shaft pit, but the device becomes component-rich and complex
Solution Approach 1:
The patent combines the unlocking function with the existing energy storage device by coupling the locking bar to the energy storage device via a resilient element. This integration eliminates the need for a separate unlocking cable and its associated components, thereby reducing device complexity while maintaining manual unlocking capability from the shaft pit.
Solution Approach 2:
The energy storage device is given dual functionality: it not only provides energy for automatic door closure during power loss but also serves as the actuation mechanism for manual unlocking. By making the locking bar coupled to the energy storage device, the same component performs multiple functions, reducing the overall number of components needed in the system.
2Reliability
If the locking bar is located in the upper door region while the energy storage device is in the lower region, then the door structure is functional, but additional components are needed to connect these regions
Solution Approach 1:
The patent merges the unlocking mechanism with the energy storage device by using the resilient element to directly couple the locking bar (in the upper region) to the energy storage device (in the lower region). This integration eliminates the need for separate unlocking cables and intermediate components that would otherwise be required to connect these two spatially separated functional elements.
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
This solution simplifies the door unlocking process by leveraging the energy storage device and resilient element to move the locking bar, reducing the complexity and enhancing ease of operation, while ensuring the door can be safely closed in case of power loss.
Implementation Method 1
an energy storage device (32), which energy storage device provides the energy for moving the door leaf (10) into the closed position
Implementation Method 2
an energy storage device (32), which energy storage device provides the energy for moving the door leaf (10) into the closed position
Data Source
AI summary
A device for unlocking a landing door includes a door leaf that can be moved between an open position and a closed position, a bar arranged on the door leaf to lock the door leaf in the closed position, and an energy accumulator coupled to the door leaf to provide the energy for moving the door leaf into the closed position in the event that the energy supply needed to drive the door leaf fails. The energy accumulator is coupled to the door leaf by an elastic element such that through a displacement of the energy accumulator when the door leaf is in the closed position, the bar is moved to an unlocked position.