Headrest Button Bezel Structure to Prevent Scratches
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Solution Overview
Problem
The existing headrest designs suffer from scratches on the bezel and inner peripheral surface due to the interaction between the operation button and the cylindrical bezel, leading to a deterioration in appearance quality, and exposure of the notch inside the headrest when the operation button is pressed, further compromising aesthetics.
Innovation Solution
The design incorporates a bezel with a locking part located on the bottom wall instead of the cylinder wall, which prevents scratches and maintains the inner portion of the headrest concealed, utilizing a biasing member to securely hold the operation button and minimize vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking pawl is provided in the operation button and engaged in the notch of the cylinder wall, then the operation button can be held in the bezel, but scratches occur on the opening of the bezel and inner peripheral surface of the cylinder wall
Solution Approach 1:
The locking part is extracted from the cylinder wall and relocated to the bottom wall of the bezel. This separates the locking function from the decorative cylindrical surface, allowing the operation button to be secured without contacting the visible outer surfaces, thereby preventing scratches while maintaining the holding function.
Solution Approach 2:
The locking mechanism is moved from the radial dimension (cylinder wall) to the axial dimension (bottom wall). The locking part engages the operation button from below through the bottom wall, changing the spatial relationship and eliminating contact between the locking pawl and the cylindrical outer surface.
2Reliability
If the notch is provided in the cylinder wall of the bezel, then the locking pawl can be engaged, but the notch exposes the inside of the headrest when the operation button is pressed
Solution Approach 1:
The notch is extracted from the cylinder wall and relocated to the bottom wall. The locking part is now formed as a recess or engagement feature in the bottom wall rather than a notch in the cylindrical surface, preventing any exposure of internal structures through the outer decorative surface while maintaining locking engagement.
3Ease of manufacture
If the locking part is provided in the cylinder wall, then the operation button can be held, but the assembly process causes rubbing and scratches
Solution Approach 1:
The locking part is extracted from the cylinder wall and placed in the bottom wall, which is not visible during assembly. This allows the locking pawl and locking part to engage without rubbing against visible surfaces, eliminating scratches while simplifying the assembly process as the locking features are positioned in a non-critical area.
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 configuration enhances the appearance quality by preventing scratches and maintaining the headrest's aesthetic integrity while providing a secure and stable operation button mechanism.
Implementation Method 1
an operation button 30, a biasing member 34 which biases the operation button 30 in an opposite direction to a pressing direction of the operation button 30
Data Source
AI summary
A headrest includes a headrest body which is tiltably supported by a stay held on a seat back, a lock part which locks the headrest body in a non-tiltable manner, and a lock release part which releases lock of the lock part. The lock release part includes an operation button to be pressed, a biasing member which biases the operation button in an opposite direction to a pressing direction of the operation button, and a bezel which has a cylinder wall and a bottom wall for containing the operation button to be movable back and forth in the pressing direction, and is provided with a locking part which locks the operation button biased by the biasing member to hold the operation button in the cylinder wall. The locking part is provided in the bottom wall.