External Sliding Threshold for Rail Vehicle Gap Bridging
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Solution Overview
Problem
Convertible high/low boarding doorways in rail vehicles often leave undesirable gaps between the vehicle and the platform, posing a safety risk to passengers, as these gaps can exceed regulatory limits when in the high boarding configuration.
Innovation Solution
An external sliding threshold assembly is coupled with the vehicle, featuring a linear telescopic slide and a locking block, which extends to bridge the gap between the vehicle and the platform, providing a continuous threshold surface for passengers to board or alight, and includes a coupling plate to synchronize the movement of internal and external thresholds without requiring additional drive systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a convertible high/low boarding doorway is used to accommodate different platform heights, then the adaptability of the vehicle is improved, but a spatial gap is created between the vehicle and the platform that exceeds safety regulations
Solution Approach 1:
The threshold assembly is designed as a dynamic structure that can move between different positions. The external threshold can slide along the vehicle body from a retracted position (for low platform boarding) to an extended position (for high platform boarding), allowing the system to adapt its configuration based on platform height while maintaining safety by eliminating gaps in the extended state
2Object-affected harmful factors
If the external sliding threshold is extended to bridge the gap between vehicle and platform, then the safety and compliance are improved, but the device complexity increases due to additional components like linear telescopic slide and locking block
Solution Approach 1:
The linear telescopic slide acts as an intermediary mechanism that connects the external threshold to the vehicle body, enabling smooth extension and retraction motion. The locking block serves as another intermediary component that provides reliable positioning and locking of the threshold in its extended state, ensuring safety while managing the complexity through standardized mechanical components
Solution Approach 2:
The external sliding threshold assembly serves multiple functions: it bridges the gap between vehicle and platform for safety, provides a stable boarding surface, and can be extended or retracted based on platform height. The coupling plate with internal threshold integration further multiplies functionality by synchronizing movements and providing structural support, reducing the need for separate independent systems
3Stability of the object's composition
If the external sliding threshold is coupled with the internal threshold through a coupling plate, then the coordination and synchronization are improved, but the manufacturing complexity increases
Solution Approach 1:
The coupling plate merges the internal threshold and external threshold into a single coordinated assembly. By integrating both thresholds onto one plate structure, the design achieves synchronized movement and stable coordination while simplifying manufacturing compared to separate independent mechanisms. The coupling plate acts as a unifying component that aligns and coordinates the two thresholds without requiring complex linkage systems
Data Source
AI summary
A threshold assembly for a vehicle door includes an external sliding threshold configured to be coupled with an exterior surface of a vehicle having a doorway. The external sliding threshold is configured to extend over the doorway to provide a threshold surface on which one or more passengers enter the vehicle via the doorway or exit the vehicle via the doorway. The external sliding threshold laterally projects from the exterior surface of the vehicle to reduce or eliminate a spatial gap between the vehicle and a platform from which the one or more passengers enter the vehicle or onto which the one or more passengers exit the vehicle.