Adjustable head restraint assembly for vehicle seats
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Solution Overview
Problem
Existing adjustable head restraint assemblies for vehicle seats lack efficient mechanisms for locking and unlocking the head restraint frame relative to the posts, leading to complex assembly processes and potential misalignment due to manufacturing tolerances.
Innovation Solution
The implementation of an elongate spring wire and a transverse guide system that allows the spring wire to move from a locked to an unlocked position by lateral translation, disengaging from the posts to permit adjustment, with a simplified assembly method and an acute angle between the transverse guide and notch to prevent unintended unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional locking mechanism is used for the head restraint frame, then the locking function is achieved, but the assembly process becomes complex and manufacturing tolerances cause misalignment
Solution Approach 1:
The locking mechanism is segmented into distinct functional components: the elongate spring wire acts as a separate locking element that can be independently assembled into the transverse guide, rather than being integrated into a complex monolithic locking mechanism. This segmentation simplifies the overall assembly process while maintaining reliable locking function.
Solution Approach 2:
The transverse guide serves as an intermediary component that mediates between the elongate spring wire and the head restraint frame. It provides a controlled path for assembling the spring wire and ensures proper alignment, thereby reducing the impact of manufacturing tolerances and simplifying the assembly process.
2Reliability
If a complex locking mechanism is implemented, then locking reliability is improved, but the number of assembly steps increases
Solution Approach 1:
The transverse guide is designed with pre-formed features that guide the elongate spring wire into the correct position during assembly. This preliminary preparation of the guide structure eliminates the need for multiple adjustment steps and complex alignment procedures, reducing assembly time while ensuring reliable locking.
Solution Approach 2:
The elongate spring wire is designed to be self-aligning within the transverse guide during assembly. The spring wire's elastic properties and the guide's geometry work together to automatically position the locking elements correctly without requiring additional assembly operations or precise manual alignment, thereby reducing assembly time and steps.
3Ease of manufacture
If manufacturing tolerances are not compensated, then production costs are reduced, but misalignment occurs in the assembled product
Solution Approach 1:
The design parameters of the transverse guide and elongate spring wire are specifically optimized to compensate for manufacturing tolerances. The guide's dimensions and the spring wire's elastic properties are chosen to provide tolerance compensation, ensuring proper alignment and function even when component dimensions vary within acceptable manufacturing ranges.
Solution Approach 2:
The elongate spring wire utilizes its elastic deformation capability to dynamically adapt to variations in component dimensions caused by manufacturing tolerances. This dynamic adjustment allows the locking mechanism to achieve proper alignment and function without requiring extremely tight manufacturing tolerances, thereby maintaining production ease while ensuring assembly precision.
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
This solution simplifies the assembly process, enhances the locking mechanism's reliability by reducing the number of assembly steps, and minimizes the impact of manufacturing tolerances, ensuring secure and adjustable head restraints.
Implementation Method 1
The elongate spring wire is generally linear, deformed and preloaded in the first position. The elongate spring wire is generally non-linear in the second position, and generally non-linear in an unloaded condition.
Data Source
AI summary
A head restraint assembly is provided with a head restraint frame mounted to a post for movement along the post for adjustment relative to a vehicle seat. The head restraint frame has a contact surface. A biasing member is mounted to the head restraint frame for movement relative to the head restraint frame to maintain the head restraint frame in a locked condition along the post. An actuation member is mounted to the head restraint frame for movement relative to the head restraint frame. The actuation member cooperates with the biasing member such that movement of the actuation member moves the biasing member, thereby disengaging the biasing member from the post to permit movement of the head restraint along the post such that the biasing member engages the contact surface in the second position to provide feedback to the user of an unlocked condition of the head restraint frame.