Headrest Support Reinforcing Sleeve Groove Design
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Solution Overview
Problem
Existing support rods for headrests face challenges in transferring forces effectively from the tube leg to a reinforcing tube due to weld projections and reduced strength from slits, leading to inadequate reinforcement and installation difficulties.
Innovation Solution
A U-shaped support with a reinforcing sleeve that has a groove on its outer surface, allowing a ridge from the tube leg's weld to engage, providing a large surface contact and preventing weakening of the reinforcing sleeve, while maintaining a rattle-free fit without reducing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the weld is machined on the outer surface to not project beyond the outer surface of the tube, then the aesthetic appearance and smooth exterior are improved, but the weld projects into the interior of the tube leg making it difficult to fit a reinforcing tube
Solution Approach 1:
The reinforcing tube is inserted into the tube leg, nesting one component inside another. The inwardly projecting weld serves as an internal stop that prevents the reinforcing tube from being inserted too far, ensuring proper positioning without requiring complex external features or post-installation adjustments.
Solution Approach 2:
The weld that projects inward automatically serves as a positioning feature for the reinforcing tube. The reinforcing tube's outer surface abuts against this weld during installation, creating a self-aligning and self-positioning mechanism that simplifies the installation process without requiring additional machining or external fixtures.
2Ease of manufacture
If a reinforcing tube with a longitudinal slit is used to accommodate the inwardly projecting weld, then the installation is enabled, but the strength of the reinforcing tube is reduced
Solution Approach 1:
The groove is created only in the specific region of the reinforcing tube where the weld needs to be accommodated, rather than using a longitudinal slit that would weaken the entire tube. This localized modification allows the weld to be received without compromising the overall structural integrity and strength of the reinforcing tube.
Solution Approach 2:
Instead of reducing the tube's cross-sectional area with a slit, the invention modifies the local geometry by creating a groove that changes the depth parameter of the tube wall in the specific area where the weld abuts. This maintains the tube's overall strength while providing the necessary accommodation for the weld projection.
3Force
If the intermediate space between the tube leg and reinforcing tube is filled to enable force transmission, then force transfer is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The reinforcing tube and tube leg are merged into a single load-bearing structure through the direct contact between the weld and the reinforcing tube. The groove in the reinforcing tube allows the weld to abut directly against it, creating a continuous load path that eliminates the need for separate force transmission mechanisms or filler materials.
Solution Approach 2:
The invention removes the need for additional force transmission mechanisms by using the weld itself as the force transfer element. The weld that would otherwise be considered a defect or obstacle is instead utilized as a positive feature that directly transmits forces from the tube leg to the reinforcing tube through the groove interface.
Data Source
AI summary
The invention relates to a support (10) for a headrest, comprising a tube leg (11) to which a head support part can be attached and having at least one free end (12a, 12b) for anchoring the support (10) in a seat fitting of an automobile seat, at least one reinforcing sleeve (15) being in the tube leg (11) for reinforcing at least one area (25) of the tube leg (11).The characterizing feature is that an outer surface (16) of the reinforcing sleeve (15) is in contact with an inner surface (17) of the tube leg (11) in a first circumferential region (T1) and that, in a second circumferential region (T2), the outer surface (16) has a groove (23) into which a ridge (22) projecting inward past the inner surface (17) engages.