Rail Vehicle Passenger Table With Plastically Deformable Joints
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Solution Overview
Problem
Existing passenger tables for rail vehicles require a large amount of space and have complex structures due to their design, which is not optimal for reducing injury risk in collisions while maintaining flexibility.
Innovation Solution
A passenger table design featuring a horizontal support beam connected to the table top via plastically deformable elements, allowing for relative movement and reducing space requirements, with a simplified structure and adjustable axis of rotation to manage collision forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the table top is flexibly attached to the car body via a plastically deformable section in the side wall column, then the functionality for providing flexibility is concentrated in the side wall column allowing free design of the table top, but the side wall support requires a relatively large amount of space and has a complex structure
Solution Approach 1:
The invention divides the flexibility function into separate components: the side wall column remains relatively simple while the plastically deformable connecting elements are positioned at the connection points between the support beam and table top. This segmentation allows the table top to be freely designed while the deformable elements are localized where needed, reducing overall structural complexity.
Solution Approach 2:
The support beam acts as an intermediary element between the side wall column and the table top. It connects to the table top at a distance from the side wall column through plastically deformable connecting elements, mediating the flexibility requirement while simplifying the side wall column structure and reducing space requirements.
2Volume of stationary object
If the support beam is connected to the table top at a distance from the side wall column via plastically deformable connecting elements, then the space requirement is reduced and structure is simplified, but the offset moments in the passenger table increase
Solution Approach 1:
The invention changes the parameters of the connecting elements by making them plastically deformable. This allows the connection to accommodate offset moments through controlled deformation rather than rigid resistance, enabling the support beam to be positioned at an optimal distance that reduces space requirements while managing the forces effectively.
Solution Approach 2:
The plastically deformable connecting elements introduce dynamic behavior to the connection between the support beam and table top. During collision, these elements deform to absorb energy and manage offset moments, allowing the structure to adapt to loading conditions rather than maintaining fixed rigid connections.
3Reliability
If the vertical axis of rotation is positioned at a distance of at least three quarters of the length of the table top from the side wall, then the rotation of the table top relative to the support beam is independent of passenger impact, but the links and energy-absorbing elements must be designed to handle increased deformation
Solution Approach 1:
The invention converts the potentially harmful passenger impact forces into beneficial energy absorption through the plastically deformable connecting elements and energy-absorbing elements. By positioning the axis of rotation optimally, the design ensures that collision forces are channeled through the deformable elements in a controlled manner, transforming unpredictable impact loads into manageable deformation processes that enhance safety.
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
The design reduces space requirements, simplifies the construction, and effectively manages collision forces by allowing the table top to move relative to the support beam, providing reliable support and improved safety characteristics.
Implementation Method 1
the support beam 3 is connected to the table top 1 at a distance from the side wall column 2 via plastically deformable connecting elements 8
Implementation Method 2
Energy-absorbing elements 11 are preferably provided between the table top 1 and the support beam 3
Data Source
AI summary
The invention relates to a passenger table for connecting to a side wall of a rail vehicle and for aligning in the transverse direction of the rail vehicle, with a side wall pillar (2) for connecting to the side wall and with a tabletop (1) which is supported via the side wall pillar (2), wherein a horizontal supporting bar (3) emerges from the side wall pillar (2) and, at a distance from the side wall pillar (2), is connected to the tabletop (1) via plastically deformable connecting elements in such a manner that, when the plastically deformable connecting elements are deformed, the supporting bar (3) is movable in a horizontal plane relative to the tabletop (1).