Vehicle Seat Backrest Frame Assembly Method
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Solution Overview
Problem
Current methods for manufacturing vehicle seat backrests are lengthy and costly due to the sequential assembly of the backrest frame and upper backrest adjustment device, which increases production time and expenses.
Innovation Solution
A method involving the simultaneous positioning and assembly of the first and second uprights of the backrest frame and the support member of the upper backrest adjustment device, utilizing complementary reliefs for guidance and rotation, with optional steps for crossmember fixation and actuator installation, to reduce assembly time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential assembly of backrest frame and upper backrest adjustment device is used, then manufacturing precision and reliability are maintained, but production time and manufacturing costs increase
Solution Approach 1:
The patent combines the assembly of the backrest frame and upper backrest adjustment device into a single simultaneous operation. The support member is positioned between the uprights during frame assembly, allowing both components to be assembled together rather than sequentially, thereby reducing production time without significantly increasing complexity
Solution Approach 2:
The support member is prepared with positioning features (reliefs) in advance that enable it to be directly integrated into the backrest frame during assembly. This preliminary preparation allows the support member to be positioned and secured in the correct location as part of the frame assembly process itself, eliminating separate assembly steps
2Loss of time
If simultaneous positioning and assembly of uprights and support member is used, then assembly time is reduced, but positioning precision requirements increase
Solution Approach 1:
The patent introduces positioning reliefs as intermediary elements that mediate between the support member and the uprights. These reliefs serve as physical guides that automatically ensure correct positioning during the simultaneous assembly process, reducing the need for high-precision manual positioning while maintaining assembly accuracy
Solution Approach 2:
The positioning reliefs are designed to automatically guide the support member into the correct position relative to the uprights during assembly. The complementary shapes of the reliefs create a self-aligning mechanism that ensures proper positioning without requiring external positioning tools or complex adjustment procedures
Data Source
AI summary
A method for manufacturing a vehicle seat backrest comprises the steps of: providing first and second uprights of a backrest frame and a support member of an upper backrest adjustment device; positioning the first upright partly facing a first side face of the support member and the second upright partly facing a second side face of the support member; moving the first upright relative to the second upright along a transverse direction of the support member, in order to sandwich the support member such that the support member of the upper backrest adjustment device is mounted on the first and second uprights of the backrest frame so as to pivot about a transverse axis.