Chair Headrest Vertical Adjustment with Quiet Button-Release Locking
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Solution Overview
Problem
Conventional devices for vertically adjusting chair headrests require a large force and generate noise, making them inconvenient for elderly, women, and children due to their high resistance and loud operation.
Innovation Solution
A device comprising a sliding member, a fixing member, and a button set with a vertical toothed part and elastic restoring force, allowing easy vertical adjustment of the headrest with low resistance and noise, using a sliding mechanism between the sliding and fixing members and a damper gear for smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional adjustment device is used for vertically adjusting the headrest, then the headrest can be adjusted vertically, but a large force is required and loud noise is generated
Solution Approach 1:
The patent replaces the conventional mechanical adjustment system with a button-operated release mechanism. Instead of directly applying large mechanical force to move the headrest, the user presses a button that releases a locking mechanism, allowing the headrest to move smoothly with minimal force. This substitution of direct mechanical force application with a control-based release system resolves the contradiction between ease of operation and force requirement.
Solution Approach 2:
The patent introduces a button-operated release mechanism as an intermediary between the user and the headrest adjustment system. The button acts as a mediator that triggers the release of the locking mechanism, enabling smooth movement of the headrest without requiring the user to directly apply large forces. This intermediary mechanism transforms the adjustment action from a high-force direct operation to a low-force control operation.
2Ease of operation
If a conventional adjustment device is used for vertically adjusting the headrest, then the headrest can be adjusted vertically, but loud noise is generated during operation
Solution Approach 1:
The patent replaces the conventional mechanical adjustment system that generates noise through friction and impact with a button-operated release mechanism. The new system uses a controlled release of a locking mechanism rather than direct mechanical forcing, which eliminates the loud noises associated with conventional adjustment devices. This substitution resolves the contradiction by enabling easy operation without generating harmful noise.
Solution Approach 2:
The patent converts the potential harm of noise-generating mechanical friction into a benefit by using a release mechanism that minimizes friction and impact. Instead of forcing parts to slide against each other (which creates noise), the system uses a button-triggered release that allows smooth, quiet movement. This transforms the adjustment mechanism from a noise-harmful system to a quiet operation system.
3Adaptability or versatility
If a conventional adjustment device is used for vertically adjusting the headrest, then the headrest can be adjusted vertically, but the high resistance causes inconvenience to elderly, women and children
Solution Approach 1:
The patent replaces the high-resistance conventional mechanical adjustment system with a button-operated release mechanism. This substitution eliminates the need for users to overcome high friction and resistance forces, making the adjustment accessible to elderly, women, and children who may not have sufficient strength for conventional mechanisms. The button press requires minimal force while the actual headrest movement requires even less force due to the released locking mechanism.
Solution Approach 2:
The patent introduces a button-operated release mechanism as an intermediary that mediates between the user and the headrest adjustment. This intermediary transforms the high-force requirement into a low-force button press, making the system adaptable to users with limited strength. The release mechanism acts as a force amplifier, allowing users with minimal strength to achieve the same adjustment effect that would require much higher forces in a conventional system.
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 easy and quiet vertical adjustment of the headrest with reduced force requirement, providing greater user convenience and stable, smooth movement.
Implementation Method 1
at least one elastic portion for providing the button set an elastic restoring force after the button set being pressed
Data Source
AI summary
An adjustment device for vertically adjusting a chair headrest is revealed and is installed on a seat back frame while in use. The adjustment device includes a sliding member, a fixing member and a button set. A vertical toothed part of the button set is moved and separated from a first rack of the sliding member when the button set is pressed. Then the sliding member is moved vertically relative to the fixing member for synchronous adjustment of vertical position of the headrest. After the button set being released, the vertical toothed part of the button set is turned back and engaged with the first rack of the sliding member. Thus the sliding member and the headrest are positioned at a new position after the adjustment.