Seat Back Frame Holder Locking Bracket Assembly
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Solution Overview
Problem
Conventional techniques for fixing a bracket to a seat back frame require temporary fixing and downstream processes like welding or plastic deformation, necessitating dedicated equipment and increasing complexity.
Innovation Solution
A seat back frame configuration featuring an upper frame with a first through-hole, a bracket with a second through-hole, and a holder with locking portions that align and lock the upper frame and bracket together, eliminating the need for special downstream processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding or plastic deformation is used to fix the bracket to the upper frame, then the fixing strength is improved, but the manufacturing complexity and equipment requirements increase
Solution Approach 1:
The patent replaces welding or plastic deformation processes with a mechanical locking system. The holder includes locking portions that engage with the upper frame and bracket through a simple insertion motion, eliminating the need for welding equipment or plastic deformation machinery while maintaining secure fixation.
Solution Approach 2:
The holder structure incorporates built-in locking portions that automatically engage with the upper frame and bracket upon insertion. The columnar portion passes through aligned through-holes, and the locking portions naturally lock into place without requiring external equipment or additional processing steps.
2Reliability
If welding or plastic deformation is used to fix the bracket, then the reliability of the connection is improved, but the production time and productivity are reduced
Solution Approach 1:
The holder is pre-designed with locking portions that are ready to engage with the upper frame and bracket. The through-holes are pre-positioned to align when the holder is inserted, allowing the locking action to occur automatically during the insertion process itself, eliminating the need for separate welding or deformation steps.
Solution Approach 2:
The complex welding or plastic deformation processes are replaced with a simple mechanical insertion and locking action. The holder's columnar portion passes through the aligned through-holes, and the locking portions secure the connection through direct mechanical engagement, significantly reducing assembly time while maintaining reliability.
3Strength
If temporary fixing and downstream processes are used, then the fixing strength is improved, but the number of manufacturing steps and equipment needs increase
Solution Approach 1:
The patent combines the temporary fixing function and the final securing function into a single integrated holder structure. The locking portions of the holder perform both functions simultaneously during the insertion process, eliminating the need for separate temporary fixing and downstream processing steps.
Solution Approach 2:
The holder structure is self-sufficient, with its locking portions automatically engaging the upper frame and bracket upon insertion. The columnar portion passes through the aligned through-holes, and the locking portions naturally lock into place without requiring external equipment or additional processing steps.
Data Source
AI summary
A seat back frame includes an upper frame having a first through-hole, a bracket having a second through-hole, and a holder including a first locking portion and a second locking portion. The upper frame includes a first inner edge portion, and the first inner edge portion inwardly defines an opening of the first through-hole located opposite to the bracket. The bracket includes a second inner edge portion, and the second inner edge portion inwardly defines an opening of the second through-hole located opposite to the upper frame. The first locking portion is locked to the first inner edge portion and the second locking portion is locked to the second inner edge portion to allow the first locking portion and the second locking portion to retain the upper frame and the bracket therebetween in the up-down direction.