Seat Cushion Support Frame With Shape-Holding Side Edge Reinforcement
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Solution Overview
Problem
Conveyance seats with a cushion frame as a skeleton struggle to stably support occupants due to the bridging member's inability to hold outer edge portions of the side support portions, leading to instability.
Innovation Solution
A conveyance seat with a seat frame serving as a skeleton, featuring a support member with a central support portion, side support portions extending outward, and a shape-holding member along the outer edges of the side support portions, which bridges the body frame, allowing for improved load distribution and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a bridging member is used to connect the front and rear connecting frames, then the support member can be simplified in structure, but the outer edge portions of the side support portions cannot be held, resulting in unstable support
Solution Approach 1:
The support member is segmented into a resin member and a shape-holding member. The resin member provides the basic support structure, while the shape-holding member specifically addresses the outer edge portions. This segmentation allows each component to fulfill its specialized function, resolving the contradiction between structural simplicity and support stability.
Solution Approach 2:
The shape-holding member is integrated with the resin member, with the shape-holding member extending along the outer edge portions of the side support portions. This nested configuration allows the shape-holding member to reinforce the resin member where needed while maintaining an overall simplified structure, thus improving reliability without significantly increasing complexity.
2Ease of manufacture
If the bridging member passes through only the central support portion and portions of the side support portions, then the attachment structure is simplified, but the outer edge portions of the side support portions are not held, creating support instability
Solution Approach 1:
The attachment function is segmented between the bridging member and the shape-holding member. The bridging member handles the central connection, while the shape-holding member specifically attaches to and holds the outer edge portions. This segmentation maintains manufacturing simplicity while ensuring comprehensive support stability.
Solution Approach 2:
The shape-holding member provides localized reinforcement and attachment at the outer edge portions of the side support portions, where support stability is most critical. This local quality approach ensures that the areas needing additional support receive it, while maintaining overall structural simplicity and ease of manufacture.
Data Source
AI summary
A conveyance seat includes a seat cushion including a cushion frame serving as a skeleton. The cushion frame includes a body frame made of a frame-shaped body, and a support member bridging one portion and the other portion of the body frame in a predetermined direction and supporting a seated occupant. The support member is provided with a central support portion supporting the seated occupant, side support portions provided at positions outside the central support portion in a seat width direction and extending outward in the seat width direction while inclining, and a shape-holding member extending along outer edge portions of the side support portions and bridging the one portion and the other position of the body frame.