Railway Vehicle Retractable Step With Manual Control and Door Retention
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Solution Overview
Problem
Railway vehicles require a retractable step system to ensure safe and easy access for the motorman when stopping at areas with high platform-to-rail height differences, without exceeding the structure gauge and without electrical connections, ensuring safety and compact size.
Innovation Solution
A mechanical retractable step system with a manually operated mechanism, comprising a vertical bar and a step that can be moved between a retracted and extended configuration, using a control member and stop device to prevent accidental activation and ensure safety features like automatic door obstruction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a retractable step system is added to allow access when stopping at areas with high platform-to-rail height differences, then the ease of operation for the motorman is improved, but the device complexity increases
Solution Approach 1:
The step system is divided into multiple independent steps (first step, second step, third step) that can be individually deployed and retracted. Each step is a separate component that can be manually operated, allowing the complex function of bridging large height differences to be broken down into simpler, manageable segments that maintain ease of operation while achieving the required functionality.
2Adaptability or versatility
If the step system is made retractable to stay within the structure gauge, then the adaptability to different stopping locations is improved, but the ease of operation deteriorates due to manual retraction requirements
Solution Approach 1:
The step system is designed to be pre-positioned within the door assembly structure, with all components (steps, support elements, guide channels) already in place and ready for deployment. The preliminary arrangement of these elements allows the steps to be quickly extended or retracted as needed, maintaining adaptability to different stopping locations while reducing the operational effort required, as no assembly or complex manipulation is needed during actual use.
3Reliability
If the step system is completely mechanical without electrical connections to ensure safety, then the reliability is improved, but the device complexity increases due to mechanical operation mechanisms
Solution Approach 1:
The step system incorporates self-latching mechanisms and automatic positioning features that allow the steps to securely extend and retract without requiring complex external control systems. The mechanical design includes self-contained elements such as latches that automatically engage when steps are extended, and spring-loaded or gravity-assisted retraction mechanisms that return steps to their stowed position without external power, thereby maintaining high reliability through simplicity while avoiding electrical connections.
Data Source
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AI summary
A retractable step system (1) for getting into and out of a vehicle has at least one step (26) and a supporting element (22), which carries the step (26) and is movable between a raised position and a lowered position; in the lowered position, the step (26) projects from the supporting element (22) along a first horizontal axis (29) so as to allow a user to place a foot on it; the system has a control member (30), which can be manually operated, and a stop device (31), which holds the supporting element (22) in the raised position, when the control member (30) is arranged in a first position, and allows the supporting element (22) to freely move to the lowered position, when the control member (30) is arranged in a second position; the control member (30) has a retention portion (35), which, in the second position, projects along a second horizontal axis (37), which is orthogonal to the first horizontal axis (29), so as to keep, in use, a vehicle door (3) open.