Cantilevered Table Structure for Wheelchair Access in Public Transport
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Solution Overview
Problem
Existing cantilevered tables in public transport vehicles have insufficient free space under the table due to arched lateral legs, which compromise mechanical strength and hinder accessibility for individuals with reduced mobility.
Innovation Solution
A cantilevered table design with improved mechanical strength, fixed to a fixing plate above a support crosspiece, eliminating the need for an arched side leg and optimizing the free space under the table by using multiple fixing members to secure the structure without additional support feet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an arched lateral leg is used to provide mechanical strength, then the structural strength is improved, but the free space volume under the table is reduced
Solution Approach 1:
The patent removes the arched lateral leg from the table structure, extracting the problematic element that occupied space under the table. The mechanical strength function previously provided by the arched leg is replaced by an alternative support system using a vertical support element and multiple fixing members attached to the vehicle structure, thereby eliminating the space obstruction while maintaining structural integrity.
Solution Approach 2:
The patent introduces an intermediate fixing plate as a mediator between the table support structure and the vehicle structure. This fixing plate distributes the mechanical loads and provides multiple attachment points, enabling the table to achieve sufficient mechanical strength through a vertical support element without requiring a bulky arched lateral leg, thus preserving free space under the table.
2Strength
If multiple fixing members are used to secure the table structure, then the mechanical strength is improved, but the device complexity increases
Solution Approach 1:
The patent segments the fixing system into multiple discrete fixing members (first upper, first lower, second upper, second lower fixing members) that are distributed at different locations and orientations. This segmentation allows each fixing member to handle specific directional loads independently, achieving comprehensive mechanical strength through a modular arrangement that is easier to manufacture and assemble compared to a single complex rigid connection.
Data Source
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AI summary
The comfort equipment (10) includes a table support frame (14) extending cantilevered in a transverse direction (Y) between a connecting end (14a) attached to a structural element (12) of the passenger compartment, and a free end (14b). The support frame (14) has a first upright (22) at its connecting end (14a), a support cross member (15) connected to the first upright (22) and extending parallel to the transverse direction (Y), and a grab bar (26) supported by the first upright (22) and extending parallel to the transverse direction (Y) and above the support cross member (15). The first upright (22) has a first upper fastening member (28a) for attaching this first upright (22) to the structural element (12).