Seat Back Side Frame with Multi-Closed-Region Overlap for Rigidity
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Solution Overview
Problem
Existing conveyance seats with side frames configured by overlapping side frame pieces face challenges in ensuring sufficient rigidity at the overlapping parts.
Innovation Solution
The conveyance seat design incorporates a side frame configuration where the first and second side frame pieces partially overlap, forming multiple closed regions in the cross-section of the overlapping part, thereby enhancing rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If side frame pieces are configured to partially overlap each other, then ease of manufacture and assembly is improved, but rigidity at the overlapping part deteriorates
Solution Approach 1:
The patent 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 specific arrangement of side frame pieces, the structural rigidity is enhanced in multiple directions without compromising the ease of manufacture and assembly of the overlapping configuration.
2Strength
If multiple closed regions are formed in the overlapping part, then rigidity 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 cross-section, enhancing rigidity while maintaining manufacturing simplicity through modular assembly of the divided components.
Solution Approach 2:
The first side frame piece and second side frame piece are combined in an overlapping configuration where their cross-sections intersect to form multiple closed regions. This merging of multiple frame pieces creates a composite structure that achieves enhanced rigidity through the geometric arrangement of closed regions without requiring additional complex components.
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 of the seat back frame has a first side frame piece and a second side frame piece partially overlapping each other in a direction of extension of the side frame. The side frame has an overlapping part where both the first side frame piece and the second side frame piece overlap each other. At the overlapping part, the side frame pieces overlap each other in a state where a plurality of closed regions and closed by being surrounded by both side frame pieces are formed in a cross section of the overlapping part intersecting with the direction of extension of the side frame.