Inverted U-Shaped Handrail Fixing Strength Distribution
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Solution Overview
Problem
Existing handrail structures in vehicle cabins, such as those in buses, often have insufficient fixing strength, particularly when passengers hold on, leading to potential instability and safety concerns.
Innovation Solution
A vehicle cabin structure featuring an inverted U-shaped handrail with upper and vertical portions fixed to the ceiling and side surfaces, along with connecting members and straps, distributes the load and enhances the overall fixing strength, even when the ceiling is of low strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the handrail is attached to the interior member of the vehicle cabin, then the handrail can be installed in the vehicle cabin, but the fixing strength of the handrail is insufficient
Solution Approach 1:
The handrail is divided into multiple segments (first handrail, second handrail, third handrail, fourth handrail) that are fixed to different structural components of the vehicle cabin. Each segment is independently fixed to distribute the load, preventing any single attachment point from bearing excessive force that would compromise fixing strength.
Solution Approach 2:
Multiple handrail segments are connected through connection portions to form an integrated handrail structure. The connection portions merge the individual handrail segments into a unified system that provides both strength and stability, allowing the handrail to function as a cohesive support structure while maintaining secure fixation points throughout the vehicle cabin.
2Force
If the handrail receives a large load at a fixed portion, then the handrail can support passenger weight, but the fixing strength at the fixed portion becomes insufficient
Solution Approach 1:
The handrail structure is segmented into multiple fixed portions (first, second, third, and fourth handrails fixed to different locations). By distributing the load across multiple fixed portions rather than concentrating it at a single point, each attachment location experiences reduced stress, maintaining fixing strength even when supporting passenger weight.
Solution Approach 2:
The handrail system extends in multiple spatial dimensions with fixed portions located at different positions and orientations within the vehicle cabin. This multi-dimensional arrangement distributes loads across diverse structural components, preventing any single fixed portion from bearing the full brunt of the force applied by passengers.
3Strength
If the ceiling portion of the vehicle cabin has low strength, then the vehicle cabin structure is simplified, but the handrail cannot be securely fixed to the ceiling
Solution Approach 1:
The handrail attachment system is segmented to include multiple fixed portions at different locations within the vehicle cabin, not all dependent on the ceiling. This allows the handrail to be securely fixed to stronger structural components (side walls, floor, or other support members) while maintaining the overall simplicity of the vehicle cabin structure with its low-strength ceiling portion.
Solution Approach 2:
Connection portions act as intermediaries that link the handrail segments to various structural components of the vehicle cabin. These connection portions provide secure attachment points that are not limited to the weak ceiling area, allowing the handrail to be firmly fixed to stronger support structures while preserving the simplified vehicle cabin design with low-strength ceiling.
Data Source
AI summary
A vehicle cabin structure includes a vehicle cabin and a handrail having an inverted U-shape and including an upper portion extending in a width direction of a vehicle along a ceiling surface of the vehicle cabin, and right and left vertical portions connected to both ends of the upper portion and extending downward along right and left side surfaces of the vehicle cabin from the respective ends of the upper portion, in which the right and left vertical portions of the handrail are fixed to the right and left side surfaces of the vehicle cabin, respectively.