Fastening structure for footrest ring of chair
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Solution Overview
Problem
Existing office chairs lack an adjustable footrest mechanism, leading to discomfort for users of varying heights, as the existing quick-release mechanisms provide insufficient holding pressure and limited adjustment capabilities.
Innovation Solution
A fastening structure for a chair's footrest ring featuring an inner sleeve with a threaded conic surface, through slot, shrinkable slots, claw plates, and a quick-release handle, combined with an outer sleeve for enhanced holding pressure and adjustable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a quick-release mechanism with one through slot is used in the inner sleeve, then the release operation is simplified, but the holding pressure against the chair post is insufficient
Solution Approach 1:
The single through slot is segmented into multiple shrinkable slots distributed around the inner sleeve circumference. Each slot works with corresponding claw plates to provide distributed clamping force, increasing total holding pressure while maintaining quick-release functionality through the handle that controls all slots simultaneously
Solution Approach 2:
The inner sleeve with multiple slots is nested within the outer sleeve, creating a layered structure where the inner sleeve provides fine-adjustment clamping through multiple slots while the outer sleeve provides additional structural support and alternative clamping paths, multiplying the overall holding pressure
2Device complexity
If the footrest position is fixed, then the structure is simple, but users of different heights cannot find a comfortable position
Solution Approach 1:
The footrest ring position is made dynamically adjustable along the chair post through the quick-release mechanism. The inner sleeve can be quickly released and repositioned to different heights, then re-clamped with holding force. This dynamic adjustability accommodates users of different heights while maintaining a relatively simple overall structure
Solution Approach 2:
The footrest system enables users to self-adjust the position to their preferred height by operating the quick-release handle. The mechanism is designed to be user-operable without requiring tools or complex procedures, allowing each user to serve their own adjustment needs
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 solution provides improved holding pressure and adjustable positioning of the footrest ring, ensuring user comfort by accommodating different user heights through enhanced clamping stability and easy adjustment.
Implementation Method 1
The inner sleeve has an outer threaded conic surface, a through slot, shrinkable slots and claw plates between adjacent two of the shrinkable slots
Data Source
AI summary
The fastening structure includes an inner sleeve, a quick-release handle and an outer sleeve. The inner sleeve has an outer threaded conic surface, a through slot, shrinkable slots and claw plates between adjacent two of the shrinkable slots. The quick-release handle is provided at a bottom end of the inner sleeve for controlling a width of the through slot. The outer sleeve is used for connecting the footrest ring and has an inner threaded conic surface to screw the outer sleeve onto the inner sleeve.