Headrest Adjustment Device with Tool-Free Latch and Gear Rack Assembly
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Solution Overview
Problem
Existing office chair headrests require the use of tools and rotational assembly, making the installation process inconvenient for users.
Innovation Solution
A quickly installed headrest adjustment device featuring a mount case with a recessed area, engaging hole, latch, and gear rack system that allows for tool-free installation by sliding the rail onto the chair back, utilizing a buffering unit and spring mechanism for adjustable movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bolts and rotatable tools are used to assemble the headrest, then the connection strength is improved, but the ease of operation deteriorates
Solution Approach 1:
The connection structure is divided into separate functional components: the mount case with engaging holes for structural attachment, the latch mechanism for securing, and the gear rack system for positioning. This segmentation allows each component to be optimized independently, enabling tool-free assembly while maintaining connection strength.
Solution Approach 2:
The latch acts as an intermediary component between the mount case and the adjustment device, providing a secure connection without requiring external tools. The gear rack and button mechanism serve as intermediaries for controlled movement and positioning, enabling strong yet easily adjustable connections.
2Reliability
If traditional bolt assembly is used, then the reliability of connection is improved, but the loss of time increases
Solution Approach 1:
The mount case is pre-formed with engaging holes and the latch is pre-positioned, allowing the adjustment device to be quickly connected without requiring sequential assembly steps. The gear rack teeth are pre-aligned to engage with the button, enabling immediate secure connection upon insertion.
Solution Approach 2:
The latch mechanism automatically secures the adjustment device to the mount case when the button is pressed into the engaging hole, without requiring external fastening tools. The gear rack system self-engages with the button's teeth, providing automatic positioning and securing that reduces installation time while maintaining reliability.
3Ease of operation
If a simple sliding mechanism is used, then the ease of operation is improved, but the device complexity increases due to additional components
Solution Approach 1:
The button serves multiple functions: it acts as a guide for insertion into the engaging hole, a lever to activate the latch release, and a gear that engages with the rack teeth for controlled movement. The gear rack simultaneously provides positioning teeth and a guide surface for the button, reducing the need for separate components and minimizing overall structural complexity.
Data Source
AI summary
A quickly installed headrest adjustment device includes a mount case connected to the chair back and includes a recessed area, an engaging hole, a latch and a first contact face on the rear side of the chair back. The engaging hole is located between the two side slots and defined through the inner bottom of the recessed area. The latch is connected to the inner top side of the engaging hole and includes a bottom face which protrudes beyond the engaging hole and faces the inner side of the recessed area. An adjustment device is mounted to the rail and includes a second contact face facing the first contact face, two ridges, and a block. The block is located between the two ridges. The users can connect the adjustment device to the mount case of the chair back to quickly install the headrest unit to the chair back.