Headrest Locking Structure for Single-Button Multi-Axis Adjustment
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Solution Overview
Problem
Existing headrest moving devices face issues with complex structures that increase manufacturing costs and reduce assemblability, while failing to minimize gaps and play, and often limit adjustment capabilities to either forward/backward or vertical positions without a single button operation.
Innovation Solution
A headrest moving device with a cover having a front and rear wall, a middle cover with a hollow portion, a locking cover with teeth, a slidable lock pin plate, and a return spring, allowing for simultaneous forward/backward and upward/downward adjustments via a single button, while maintaining constant spacing between the front and rear walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single button is used to adjust both forward/backward and vertical positions, then operational convenience is improved, but device complexity increases
Solution Approach 1:
The patent combines the forward/backward adjustment mechanism and vertical adjustment mechanism into a single integrated system. The lock plate simultaneously controls both the horizontal position (via lock pin engaging with teeth on locking cover) and vertical position (via lock pin engaging with catching grooves on stay rod), allowing both adjustments through one button operation.
Solution Approach 2:
The lock plate serves multiple functions: it acts as a horizontal lock when engaging with the locking cover, a vertical lock when engaging with the stay rod, and a movement actuator when pushed by the button. This multi-functionality reduces the need for separate control mechanisms for each adjustment direction.
2Manufacturing precision
If the cover is formed as an integrated body with constant spacing between front and rear walls, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The cover is divided into front cover and rear cover as separate components that are coupled together. The front cover includes the front wall and side walls, while the rear cover includes the rear wall. This segmentation allows each component to be manufactured separately with precise dimensions, then assembled to achieve the required constant spacing.
Solution Approach 2:
Coupling hooks are used as intermediary elements to connect the front cover and rear cover. These hooks engage with corresponding structures on the opposite covers, maintaining the constant spacing between front and rear walls while allowing for assembly and disassembly.
3Ease of manufacture
If teeth are formed integrally with the front cover, then manufacturing simplicity is improved, but strength decreases
Solution Approach 1:
The teeth are formed as a separate component (locking cover) rather than being integrally molded with the front cover. This allows the teeth to be manufactured from a harder, more wear-resistant material while the front cover can be made from a different material optimized for its structural functions.
Solution Approach 2:
The locking cover (containing teeth) and front cover are made from different materials optimized for their respective functions. The locking cover material is selected for high strength and wear resistance to handle the engagement with lock pin, while the front cover material can be optimized for structural integrity and aesthetics.
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 device simplifies the structure, improves assemblability, reduces manufacturing costs, and enhances user convenience by allowing seamless adjustment of both forward/backward and upward/downward positions with reduced operational force and noise, while minimizing device gaps and play.
Implementation Method 1
a return spring configured to return the lock plate or the lock pin plate
Data Source
AI summary
Disclosed is a headrest moving device. The headrest moving device includes: a cover including a front wall and a rear wall a middle cover disposed inside the cover and formed with a hollow portion; a locking cover inserted into the hollow portion, connected to the cover, and formed with teeth along a forward/backward direction thereof; a lock pin plate installed on the middle cover to be slidable in a leftward/rightward direction and provided with a lock pin inserted into the teeth; a lock plate formed with through-holes through which vertical portions of a stay rod pass, the lock plate being installed on the middle cover to be slidable in the leftward/rightward direction and being connected to the lock pin plate; a return spring configured to return the lock plate or the lock pin plate; and a button configured to move the lock plate in the leftward/rightward direction. The cover is formed in an integrated body so that the spacing between the front wall and the rear wall may be maintained constantly.