Elevator Door Interlock Assembly Coaxial Design
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Solution Overview
Problem
The existing elevator door interlock assemblies face challenges in optimizing the structural design to efficiently manage the limited space between the landing door and car door while maintaining functional requirements, such as locking and releasing mechanisms, without compromising their guiding and locking functions.
Innovation Solution
The elevator door interlock assembly incorporates a coaxial design using a common rotating shaft for the hanging wheel and lock arm, allowing for compact installation without additional brackets, reducing costs and optimizing space utilization, and includes adjustable components for precise positioning of door rollers and switches to ensure reliable engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate brackets are used to install the hanging wheel and lock arm, then the installation is flexible, but the device complexity increases and space is wasted
Solution Approach 1:
The patent merges the installation brackets for the hanging wheel and lock arm into a single common bracket structure. The common rotating shaft serves both components, eliminating the need for separate brackets and reducing overall structural complexity while maintaining installation flexibility.
Solution Approach 2:
The common rotating shaft acts as a universal component that performs multiple functions: it serves as the rotation axis for the hanging wheel, the rotation axis for the lock arm, and the installation reference for both components. This multi-functional design reduces the number of parts and simplifies the overall structure.
2Reliability
If more components are added to the interlock assembly, then the locking and guiding functions are improved, but the space consumption increases
Solution Approach 1:
The patent combines the locking mechanism and guiding mechanism into a compact integrated assembly. The lock arm and hanging wheel share the common rotating shaft and installation bracket, allowing both locking and guiding functions to be achieved within a reduced space envelope.
Solution Approach 2:
The design employs a nested arrangement where the lock arm and hanging wheel are positioned concentrically around the common rotating shaft. The lock arm can rotate within the space defined by the hanging wheel's path, creating a compact nested structure that minimizes overall volume while maintaining both functions.
3Strength
If the lock hook and locking opening are positioned off-axis, then the locking action is stronger, but the switch engagement becomes unreliable
Solution Approach 1:
The patent introduces an asymmetric offset design where the lock hook and locking opening are positioned at an offset from the common rotating shaft axis. This asymmetric positioning creates a stronger locking action while the offset distance is carefully controlled to ensure that the switch plug and switch socket can still engage reliably at the appropriate rotation position.
Solution Approach 2:
The design optimizes the offset parameter between the lock hook/locking opening and the common rotating shaft. By carefully selecting the offset distance, the patent achieves a balance where the locking force is maximized while the switch engagement remains reliable. The offset parameter is tuned to ensure both functions work simultaneously.
Data Source
AI summary
An elevator door interlock assembly and an elevator system. The elevator door interlock assembly includes: a first base plate on which a common rotating shaft is arranged; a first hanging wheel, which is pivotally connected to the first base plate through the common rotating shaft and guides the first base plate to reciprocate in an opening and closing direction of an elevator door; and a first lock arm, a middle part of which is pivotally connected to the first base plate through the common rotating shaft, so as to rotate between a locked position and a released position when the elevator door is closed.