Seatback Bead Structure for Three-Point Mount Stability
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Solution Overview
Problem
Existing seatbacks coupled to vehicles at three points are prone to significant displacement when subjected to external forces in the front-rear direction, lacking sufficient structural integrity.
Innovation Solution
A seatback design featuring a back frame with a fixed portion, rotatable coupled portions, and diagonal and vertical bead protrusions that enhance structural rigidity and prevent displacement, while allowing rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seatback is coupled to the vehicle at only three portions (upper part of one side and lower parts of both sides), then the ease of installation and structural simplicity are improved, but the stability and resistance to displacement in the front-rear direction deteriorate
Solution Approach 1:
The back panel is segmented into multiple regions by forming bead portions (protrusions) that divide the panel into separate zones. This segmentation creates multiple reinforcement zones without adding separate structural components, maintaining the simplicity of the three-point coupling while improving overall stability.
Solution Approach 2:
Bead portions are strategically positioned at specific locations on the back panel (including diagonal and vertical arrangements) to provide localized reinforcement where needed. This allows the structure to maintain flexibility in non-critical areas while gaining enhanced rigidity at key positions to resist displacement forces.
2Stability of the object's composition
If the back panel is made more rigid to prevent displacement, then the stability is improved, but the rotational functionality at the coupled portions deteriorates
Solution Approach 1:
The bead portions are positioned to reinforce the back panel while deliberately avoiding the coupled portions where rotation occurs. This localized reinforcement strategy enhances overall panel rigidity to resist displacement while preserving the rotational movement capability at the coupling points.
Solution Approach 2:
The panel is divided into reinforced zones (with beads) and flexible zones (near couplings) through strategic bead placement. This segmentation allows different regions of the same panel to have different mechanical properties - rigid where needed for stability, flexible where needed for rotation.
Data Source
AI summary
One aspect of the present disclosure provides a seatback including a back frame, a fixed portion, a first coupled portion, a second coupled portion, a first diagonal bead portion, and a second diagonal bead portion. The first diagonal bead portion (i) is raised from a surface of a back panel of the back frame in a thickness direction thereof and (ii) extends in a diagonal direction inclined relative to a seat width direction and a seat up-down direction. The second diagonal bead portion (i) is provided at a diagonal position relative to the first diagonal bead portion on the back panel, (ii) is raised from the surface of the back panel in the thickness direction thereof, and (iii) extends in the diagonal direction.