Quick-Release Footrest Ring Adjustment for Chair Center Posts
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Solution Overview
Problem
Existing office chairs lack an adjustable footrest, leading to discomfort for users of varying heights as the footrest position cannot be properly adjusted to meet individual needs.
Innovation Solution
An adjustable footrest ring system comprising an inner sleeve, quick-release handle, support frame, and ring, which allows easy adjustment by sliding along a central post using a bolt and nut mechanism, with threaded surfaces for secure attachment and anti-slip pads for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed footrest is provided on office chairs, then users of specific height can have their feet supported, but users with different heights cannot adjust the footrest to a proper position
Solution Approach 1:
The footrest ring is designed to be movable along the central post with a threaded engagement mechanism. The inner sleeve with external threads engages with the conical internal threads of the outer sleeve, allowing the footrest ring to be dynamically positioned at different heights by rotating the quick-release handle, which drives the bolt to move the inner sleeve along the threads.
Solution Approach 2:
The quick-release handle acts as an intermediary mechanism between the user's manual operation and the footrest position adjustment. When the user rotates the quick-release handle, it drives the bolt to move horizontally, which in turn moves the inner sleeve along the central post via thread engagement, achieving precise and easy position adjustment.
2Reliability
If a threaded adjustment mechanism is used for footrest position adjustment, then secure positioning is achieved, but the adjustment mechanism becomes more complex
Solution Approach 1:
The adjustment mechanism employs a nested structure where the inner sleeve with external threads is inserted into the outer sleeve with internal threads. The quick-release handle with bolt is nested within the inner sleeve, and the entire assembly engages with the central post. This nested design consolidates multiple components into a compact unit that maintains reliability while minimizing overall complexity.
Solution Approach 2:
The threaded engagement mechanism between the inner and outer sleeves provides self-locking capability. Once the quick-release handle is rotated to the desired position, the thread engagement automatically maintains the position without requiring additional locking mechanisms, as the friction and geometric engagement of the threads prevent unintended movement.
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 users to customize the footrest position to their height, enhancing comfort and usability by allowing easy adjustment and secure positioning.
Implementation Method 1
An outer threaded surface 12 is formed on the inner sleeve 1... An inner threaded surface 22 is formed inside the outer sleeve 21 so as to be able to screw the outer sleeve 21 onto the inner sleeve 1
Implementation Method 2
The inner sleeve 1 can be normally keep its original shape or forcedly shrunken because of the through slot 11... The inner sleeve 1 can be shrunken to clamp the central post 101 when the bolt 5 with the nut 6 is tightened
Data Source
AI summary
The invention provides an adjustable footrest ring for a chair with a central post. The invention includes an inner sleeve, a quick-release handle, a support frame and a ring. The inner sleeve is used for being put around the central post and has an outer threaded surface, a through slot and a pair of passing holes below the outer threaded surface. The quick-release handle is formed with a through hole at an end thereof. The through hole corresponds to the passing holes for being passed through by a bolt. The inner sleeve is shrunken when the bolt is tightened and the quick-release handle is closed. The support frame has an outer sleeve and support rods radially extending therefrom. An inner threaded surface is formed inside the outer sleeve so as to screw the outer sleeve onto the inner sleeve. The ring is connected to outer ends of the support rods.