Automotive Headrest Rectilinear Motion Mechanism
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Solution Overview
Problem
Conventional automotive headrests have complex structures due to both tilting and elevating mechanisms, increasing manufacturing costs and reducing efficiency.
Innovation Solution
A simplified automotive headrest design featuring a stay rod, horizontal guide frame, ratchet slider, ratchet pawl, tension spring, and ratchet spring, allowing for rectilinear motion in one direction with secure assembly and operation, reducing parts and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional automotive headrest includes both a tilting mechanism and an elevating mechanism, then the headrest can adjust to different positions and angles, but the structure becomes complicated, increasing manufacturing cost and reducing productivity
Solution Approach 1:
The patent extracts and removes the tilting mechanism from the headrest design, keeping only the elevating mechanism. This extraction eliminates the complicated interaction between tilting and elevation functions, simplifying the overall structure while maintaining the essential capability of height adjustment for adaptability.
Solution Approach 2:
Instead of using a conventional tilting mechanism that rotates around an axis, the patent inverts the approach by using a rectilinear motion mechanism with guide grooves and sliders. The headrest moves up and down in a straight line rather than tilting, achieving position adjustment through vertical translation only.
2Adaptability or versatility
If a conventional automotive headrest includes both tilting and elevating mechanisms, then comprehensive adjustment is achieved, but manufacturing cost increases
Solution Approach 1:
By extracting the tilting mechanism and retaining only the elevating mechanism, the patent reduces the number of parts, assembly steps, and manufacturing processes required. This extraction directly lowers manufacturing cost while the elevating mechanism alone provides sufficient adaptability for headrest height adjustment.
Solution Approach 2:
The patent makes the elevating mechanism serve multiple purposes: it provides both the position adjustment function and the tilting function that were previously separate. The rectilinear motion mechanism achieves comprehensive adjustment capability through vertical movement alone, eliminating the need for a dedicated tilting mechanism.
3Adaptability or versatility
If a conventional automotive headrest includes both tilting and elevating mechanisms, then full adjustment capability is provided, but the manufacturing period increases
Solution Approach 1:
Removing the tilting mechanism reduces the number of components that need to be manufactured, assembled, and quality-checked. This extraction shortens the manufacturing period by eliminating entire subsystems while retaining the essential elevating function through a simplified rectilinear motion mechanism.
Solution Approach 2:
The patent segments the adjustment function into a single elevating mechanism with guide grooves and sliders, rather than having separate tilting and elevating systems. This segmentation into one integrated mechanism reduces assembly complexity and manufacturing time compared to coordinating two independent mechanisms.
4Adaptability or versatility
If a conventional automotive headrest uses a tilting mechanism, then tilting adjustment is achieved, but the construction becomes complicated
Solution Approach 1:
The patent inverts the conventional tilting approach by replacing rotational movement with rectilinear motion. Instead of the headrest tilting around an axis, it moves up and down in a straight line guided by grooves and sliders, achieving position adjustment through vertical translation rather than angular rotation.
Solution Approach 2:
The patent replaces the complex mechanical tilting system with a simpler rectilinear motion system using guide grooves and sliders. This substitution eliminates the need for hinges, bearings, and rotational joints, reducing construction complexity while maintaining adjustment capability.
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
The design enhances product reliability, reduces manufacturing costs, and improves productivity by simplifying the construction and assembly process, making it more competitive in terms of price.
Implementation Method 1
a tension spring returning the displaced ratchet slider to an original position thereof
Implementation Method 2
a ratchet spring providing tensile force to the ratchet pawl
Data Source
AI summary
Disclosed herein is an automotive headrest, which is constructed so that the automotive headrest is not tilted, but is displaced in a straight line in only one direction in a rectilinear motion, and is then returned to its original position. The automotive headrest includes a stay rod having vertical parts secured to a seat, and a horizontal part coupling the vertical parts to each other. A horizontal guide frame is secured to the horizontal part of the stay rod. A ratchet slider is movably mounted to the horizontal guide frame. A ratchet pawl locks or releases the ratchet slider. A tension spring returns the displaced ratchet slider to its original position. A ratchet spring provides tensile force to the ratchet pawl.