External Boarding Assembly for Railway Vehicles
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Solution Overview
Problem
Existing boarding assemblies for vehicles, particularly railway vehicles, face challenges such as costly and time-consuming modifications for retrofitting, difficulty in pivoting, and space constraints, making them unsuitable for varying platform heights and impractical for retrospective installation.
Innovation Solution
A boarding assembly configured as a structural unit entirely independent of the vehicle, with a pivot device and steps that rotate externally on the vehicle body, allowing easy retrofitting and operation on platforms of different heights without modifying the vehicle, featuring an L-shaped attachment arrangement and articulated connection between steps for stable and efficient height and lateral distance coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the boarding assembly is integrated into the vehicle body with recesses and modifications, then the structural integration is improved, but the ease of retrofitting deteriorates
Solution Approach 1:
The boarding assembly is designed as a separate, modular unit that can be attached to the vehicle body without integrating it into the vehicle's structural framework. This segmentation allows the boarding assembly to be installed independently on existing vehicles through external attachment means, eliminating the need for costly and time-consuming modifications to the vehicle body while maintaining functional stability.
2Ease of operation
If the positioning piston is guided through the carriage body longitudinal member, then the positioning function is improved, but the device complexity deteriorates
Solution Approach 1:
The positioning piston and its guiding mechanism are extracted from the vehicle body structure and integrated into the boarding assembly unit itself. The positioning piston is now guided through openings in the boarding assembly's support structure rather than requiring recesses in the vehicle's carriage body longitudinal member. This extraction simplifies the overall device by eliminating the need for complex modifications to the vehicle body while maintaining the positioning function.
Solution Approach 2:
The boarding assembly's support structure serves as an intermediary between the positioning piston and the vehicle body. Instead of the piston directly interacting with the vehicle body through complex recesses, the support structure mediates this interaction by providing its own guiding openings and mounting interfaces, thereby simplifying both the positioning mechanism and the vehicle body modification requirements.
3Volume of moving object
If the stairway is arranged partially within the vehicle, then the space utilization is improved, but the ease of retrofitting deteriorates
Solution Approach 1:
The stairway is designed as an external, detachable component of the boarding assembly rather than being integrated into the vehicle's internal structure. This segmentation allows the entire boarding assembly including the stairway to be mounted on the exterior of the vehicle body, eliminating the need to modify the vehicle's internal space while enabling easy retrofitting of existing vehicles.
Data Source
AI summary
A boarding assembly (1) for boarding a vehicle (2), wherein, in a mounted state, the assembly is arranged outside the vehicle body (4) on a vehicle body outer wall. The boarding assembly (1) comprises at least one first step (10), which is suspended in the boarding assembly (1) such that the first step can rotate about a first axis of rotation. The boarding assembly (1) also comprises a pivot device (20) having a second axis of rotation (22), running substantially parallel to the vehicle body outer wall in the mounted state. The pivot device (20) is arranged entirely on the outside of the vehicle body outer wall, in particular within the boarding assembly (1), in the mounted state.