Seat Back Side Frame with Multi-Closed-Region Overlapping for Rigidity
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Solution Overview
Problem
Conveyance seats with side frames configured by overlapping side frame pieces face challenges in ensuring sufficient rigidity at the overlapping parts, which affects the structural integrity and stability of the seat.
Innovation Solution
The design incorporates a side frame configuration where first and second side frame pieces partially overlap, forming multiple closed regions in the cross-section of the overlapping part, enhancing rigidity by aligning these regions in intersecting directions and utilizing raised reinforcement portions to prevent the side frame from spreading outward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If side frame pieces are configured to overlap each other to enable flexible seat size variation, then adaptability is improved, but rigidity at the overlapping part deteriorates
Solution Approach 1:
The invention transitions from a single closed region configuration to a multi closed region configuration in the cross-sectional view of the overlapping part. By forming multiple closed regions (first closed region and second closed region) through the overlapping arrangement of side frame pieces, the structural rigidity is enhanced in multiple directions without compromising the adaptability of seat size variation.
Solution Approach 2:
The overlapping structure of side frame pieces creates a composite structural system where multiple frame pieces work together to form a reinforced overlapping part. This composite arrangement of multiple closed regions provides enhanced rigidity compared to a single closed region, while maintaining the modular nature that allows for flexible seat size adjustments.
2Strength
If multiple closed regions are formed in the overlapping part to enhance rigidity, then strength is improved, but device complexity increases
Solution Approach 1:
The side frame is divided into multiple side frame pieces (first side frame piece and second side frame piece) that overlap each other. This segmentation allows the formation of multiple closed regions in the overlapping part, enhancing rigidity while maintaining modular construction that simplifies manufacturing and assembly processes.
3Stability of the object's composition
If raised regions are added to prevent side frame from spreading outward, then stability is improved, but manufacturing complexity increases
Solution Approach 1:
Raised regions are added locally at specific positions on the side frame pieces rather than throughout the entire structure. This localized reinforcement prevents the side frame from spreading outward at critical areas while maintaining the overall simplicity of the manufacturing process and not requiring complex modifications to the entire side frame structure.
Data Source
AI summary
Rigidity is improved at a part where side frame pieces overlap each other in a side frame. In a vehicle seat provided with a seat back frame, a side frame 10 of the seat back frame has a first side frame piece 20 and a second side frame piece 30 partially overlapping each other in a direction of extension of the side frame 10. The side frame 10 has an overlapping part 40 where both the first side frame piece 20 and the second side frame piece 30 overlap each other. At the overlapping part 40, the side frame pieces overlap each other in a state where a plurality of closed regions 41 and 42 closed by being surrounded by both side frame pieces are formed in a cross section of the overlapping part 40 intersecting with the direction of extension of the side frame 10.