Seatback and headrest assembly
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Solution Overview
Problem
Conventional headrest assemblies for rear seating options lack sufficient adjustability, particularly in terms of telescoping and pivoting mechanisms, which limits user comfort and alignment with the seat occupant.
Innovation Solution
A seat assembly with a telescoping headrest assembly that includes a track member with a channel, a carriage member with a hollow interior cavity, and a guide plate that pivots between positions, allowing the headrest to move between extended and retracted positions while adjusting its angle to align with the user, supported by upper and lower portions of a support rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fixed headrest assembly is used, then the structure is simple and easy to manufacture, but the adjustability and user comfort are limited
Solution Approach 1:
The headrest assembly is transformed from a fixed structure to a dynamic adjustable system. The support rod with telescoping capability allows the headrest to move between extended and retracted positions, while the guide plate with pivotable connection enables angular adjustment. This dynamic design provides multiple adjustment positions and angles, significantly improving adaptability to different user needs while maintaining reasonable structural complexity through modular components.
2Adaptability or versatility
If a telescoping mechanism is added to allow headrest extension and retraction, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The support rod is divided into multiple telescoping segments that can extend and retract relative to each other. This segmentation allows the headrest to achieve various lengths and positions without requiring a completely complex mechanism. Each segment can be independently controlled, providing fine-grained adjustment capability while keeping the overall structure manageable through modular design.
Solution Approach 2:
The telescoping support rod introduces dynamic adjustment capability, allowing the headrest to transition between extended and retracted positions. This dynamic element is coupled with the pivotable guide plate to create a multi-degree-of-freedom adjustment system that enhances adaptability while distributing the complexity across separate functional components.
3Ease of operation
If a pivotable guide plate is added to align the headrest with the user, then the comfort and alignment improve, but the manufacturing complexity increases
Solution Approach 1:
The guide plate assembly is segmented into the pivotable guide plate component and the support rod component, connected through a pivot connection. This segmentation allows each component to be manufactured and assembled separately, simplifying the manufacturing process while enabling the pivotable functionality for user alignment. The modular approach makes it easier to produce and assemble the guide plate mechanism.
4Adaptability or versatility
If multiple adjustment mechanisms are combined for telescoping and pivoting, then the versatility improves, but the device complexity increases
Solution Approach 1:
The telescoping support rod mechanism and the pivotable guide plate mechanism are merged into an integrated headrest assembly. The support rod connects the headrest to the seatback frame, while the guide plate provides pivotable guidance for the support rod's movement. This merging of multiple adjustment functions into a single coordinated assembly achieves versatile adjustment capability (both telescoping and pivoting) while managing overall system complexity through integrated design.
Solution Approach 2:
The combined mechanism introduces multiple dynamic degrees of freedom: telescoping motion of the support rod and pivoting motion of the guide plate. This dynamic multi-axis adjustment system provides comprehensive versatility, allowing the headrest to adapt to various user positions and preferences. The dynamic design coordinates both mechanisms to work together, enhancing adaptability while distributing complexity across functional components.
Data Source
AI summary
A seat assembly includes a seatback with a frame assembly. A track member is operably coupled to the frame assembly. A carriage member is pivotally and slideably coupled to the track member between raised and lowered positions. At least one support rod having upper and lower portions is operably coupled to the carriage member for movement therewith. A headrest assembly is supported on the upper portion of the at least one support rod and is operable between extended and retracted positions. The headrest assembly includes a headrest bun with a downwardly extending lower portion. The seatback includes a receiving area extending inwardly from a front side of the seatback and extending downwardly from an upper side of the seatback. A portion of the downwardly extending lower portion of the headrest assembly is received in the receiving area of the seatback when the headrest assembly is in the retracted position.