Seat Back Side Frame Bead Structure for Backward Load Rigidity
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Solution Overview
Problem
The existing seat frames in conveyances face limitations in weight reduction due to the risk of deformation when subjected to backward loads, restricting the reduction of plate thickness while maintaining necessary strength.
Innovation Solution
A seat frame design featuring a bead formed on the panel of the side frame that crosses the deformation line, preventing deformation by enhancing bending strength, allowing for reduced plate thickness while ensuring strength, and incorporating a recliner to connect side frames for rotation and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the plate thickness of the side frame is reduced for weight reduction, then the weight of the back frame is reduced, but the side frame may deform when backward load is applied to the back frame
Solution Approach 1:
The patent applies local quality by forming a bead structure at specific locations on the panel where deformation is most likely to occur. This bead is created through localized extrusion molding that concentrates material and structural reinforcement precisely at the critical deformation zone, rather than uniformly thickening the entire panel. This allows weight reduction in non-critical areas while maintaining strength where needed.
Solution Approach 2:
The bead formed on the panel has a curved, rounded cross-section created by extrusion molding. This curved structure distributes stress more effectively than a sharp ridge would, and the spherical/rounded geometry provides better mechanical resistance to deformation while using less material than a solid reinforcement would require.
2Weight of moving object
If the plate thickness of the side frame is reduced for weight reduction, then the weight of the back frame is reduced, but the manufacturing complexity increases due to the need for bead formation
Solution Approach 1:
The bead formation process is merged with the existing extrusion molding process used to create the flange parts of the side frame. By integrating the bead creation into the same manufacturing step and equipment that forms the flanges, the patent avoids adding separate manufacturing operations or equipment, thus minimizing the increase in manufacturing complexity while achieving the structural reinforcement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables weight reduction of the seat frame while maintaining necessary strength by suppressing deformation under backward loads, enhancing the bending strength of the panel and preventing deformation of the side frame.
Implementation Method 1
the bead may be provided so as to enhance bending strength of the panel in a direction that crosses the deformation line
Data Source
AI summary
A seat frame for a conveyance seat includes a cushion frame, a back frame, and a recliner. The side frame on a back side is structured by a panel extending in a front-back direction. Flange parts directed towards a center side in a seat width direction are provided in both front and back edge parts of the panel, respectively. A bead that crosses a deformation line is formed on the panel so as to prevent deformation of the panel of the side frame on the back side due to displacement of the front side flange part towards the center side in the seat width direction with respect to a connecting part with the recliner when backward load is applied to the back frame, the deformation line being a line set on the panel on an assumption that deformation occurs.