Conveyance seat
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Solution Overview
Problem
Conveyance seats face challenges in balancing the flexibility and rigidity of pressure-receiving members, particularly in reducing impact loads during rear collisions while maintaining riding comfort.
Innovation Solution
Incorporating a load-receiving portion with a vertically shorter length and a reinforcement portion protruding along the thickness direction, extending along the width direction, and strategically positioned reinforcement ribs to enhance rigidity while ensuring flexibility, and accommodating reinforcement portions within concave grooves to prevent deflection deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the pressure-receiving member has wide portions and narrow portions alternately arranged to reduce weight and improve flexibility, then the weight is reduced and flexibility is improved, but the rigidity of the side end portions decreases
Solution Approach 1:
The patent applies local quality by providing reinforcement portions specifically at the side end portions of the pressure-receiving member where rigidity is needed, while maintaining the alternating wide and narrow portion structure in other areas for flexibility and weight reduction. This localized reinforcement allows different parts of the same component to have different mechanical properties appropriate for their specific functional requirements.
2Object-affected harmful factors
If the pressure-receiving member is designed to move rearward to reduce impact load during collision, then the impact load on occupant is reduced, but the structural complexity increases
Solution Approach 1:
The patent applies dynamics by designing the pressure-receiving member to be movable rather than fixed, allowing it to move rearward during collision to reduce impact load on the occupant. The member is configured with appropriate attachments to the seat back frame that enable controlled movement while maintaining structural integrity, transforming a static structure into a dynamic safety mechanism.
3Ease of operation
If the load-receiving portion piece has shorter length in vertical direction to improve flexibility, then the flexibility is improved, but the rigidity decreases
Solution Approach 1:
The patent applies dimensionality change by adding reinforcement portions that extend in the width direction (horizontal dimension) rather than increasing the vertical dimension. This allows the load-receiving portion piece to maintain its short vertical length for flexibility while gaining rigidity through horizontal reinforcement elements, effectively solving the contradiction by addressing structural strength in a different dimensional orientation.
Data Source
AI summary
To secure both flexibility and rigidity of a pressure-receiving member, a pressure-receiving member capable of moving rearward in a state of receiving a load from a back of an occupant is included in a seat back of a conveyance seat for supporting the back of the occupant. The pressure-receiving member has a load-receiving portion which receives the load from the back of the occupant at a front face, and the load-receiving portion includes a load-receiving portion piece formed so that a length in a vertical direction of the seat back is shorter than a length in a seat width direction, and a rear reinforcement rib protruding along a thickness direction of the load-receiving portion from the load-receiving portion piece and extending along the seat width direction.