Office Chair Headrest Bias Rack for One-Handed Height Adjustment
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Solution Overview
Problem
Conventional headrest adjustment structures require users to leave their chair to adjust the height, as the engagement between teeth rows is not smooth and requires pressing the button member for both upward and downward adjustments, making it inconvenient for users.
Innovation Solution
A headrest device featuring a flat rod with a ditch and bias rack, an adjusting seat with a pressing member and buffer assembly, allowing vertical sliding and automatic re-engagement for smooth and one-handed adjustment, enabling users to adjust the headrest without leaving their chair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the button member is pressed to engage the button teeth row with the first teeth row for headrest adjustment, then the headrest can be positioned at new heights, but the user must leave the chair to perform the adjustment
Solution Approach 1:
The pressing member is designed to be automatically pushed outward by an elastic component, allowing the hooking teeth to automatically engage with the bias rack teeth without requiring user intervention. The system serves itself by using elastic force to maintain the engagement state, eliminating the need for users to leave the chair for adjustment.
Solution Approach 2:
The pressing member is designed to be movable rather than fixed, allowing it to swing between engaged and disengaged states. This dynamic design enables the adjustment mechanism to transition smoothly between different headrest positions while maintaining secure engagement at each position.
2Reliability
If the button teeth row and first teeth row are engaged in a front-and-rear direction with strict tooth correspondence, then the headrest can be firmly positioned, but the engagement process becomes non-smooth and complex
Solution Approach 1:
The bias rack teeth are designed with asymmetric geometry, featuring a sloped engagement surface that guides the hooking teeth into proper alignment automatically. This asymmetric design simplifies the engagement process by eliminating the need for precise manual alignment while maintaining firm engagement.
Solution Approach 2:
The pressing member acts as an intermediary component that mediates between the user's adjustment action and the teeth engagement. It translates the user's pressing motion into the proper engagement of hooking teeth with bias rack teeth, simplifying the overall interaction.
3Adaptability or versatility
If the button member must be pressed for both upward and downward adjustments, then the headrest can be repositioned, but the operation requires two-handed control and leaves the chair
Solution Approach 1:
The elastic component provides periodic restoring force that automatically returns the pressing member to its engaged state after each adjustment. This periodic action allows for rapid successive adjustments without requiring the user to maintain continuous pressure or leave the chair.
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
Enables direct, rapid, and firm adjustment of the headrest from a seated position, providing a smooth and convenient user experience with a unidirectional ratchet effect for upward sliding and automatic fastening at desired positions.
Implementation Method 1
an elastic portion for providing an elastic restoring force to the button member after being pressed
Implementation Method 2
a buffer assembly
Data Source
AI summary
A headrest device includes a headrest support and an adjusting seat. The headrest support is a flat rod and has a ditch and a bias rack beside the ditch. The adjusting seat is being inserted by the headrest support and has a pressing member and a buffer assembly. The pressing member is elastically pivotedly connected into a side of the adjusting seat. Part of the pressing member protrudes from the adjusting seat. The pressing member has hooking teeth corresponding to the bias rack in biasing direction and an elastic arm pressed by the adjusting seat so as to make the pressing member normally elastically outward pushed and swayable. The hooking teeth engages with the bias rack.