Star-Shaped Chair Base with Hinged Arms for Friction-Based Stability
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Solution Overview
Problem
Existing chair devices with star-shaped bases require complex and costly mechanical solutions to allow rotation or swinging without altering the supporting structure, which can lead to accidental movement and safety issues.
Innovation Solution
A star-shaped base with extending arms hinged to a center seat, allowing the center seat to rotate and lower to the ground, thereby preventing accidental movement through static friction generated by the user's load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex mechanical solutions are added to allow rotation or swinging, then the chair device can change posture along with load changes, but the device complexity increases and manufacturing costs increase
Solution Approach 1:
The patent applies the dynamics principle by making the star-shaped base itself movable through hinged extending arms that can rotate relative to the center seat. This dynamic base structure enables the chair to automatically adapt to load changes and user movements without requiring complex mechanical solutions in the supporting structure above the chair column.
Solution Approach 2:
The patent solves the problem by moving the rotational mechanism from the vertical dimension (above the chair column) to the horizontal dimension (at the base level). The hinged extending arms rotate horizontally relative to the center seat, enabling posture adaptation through base movement rather than through complex vertical supporting structures.
2Ease of operation
If the star-shaped base with rollers is used, then the chair device can move on the ground, but accidental movement or rolling may occur posing safety dangers
Solution Approach 1:
The patent applies preliminary action by having the center seat lower to the ground in advance before the user needs to be securely positioned. This preliminary lowering action ensures that the base is already stable and friction-based before any user movement occurs, preventing accidental rolling from the outset rather than reacting to it afterward.
Solution Approach 2:
The patent inverts the traditional approach by making the base stationary through friction rather than relying on rollers for all movements. Instead of using rollers continuously, the center seat lowers to engage friction with the ground, inverting the mobility mechanism from rolling to friction-based stability, which prevents accidental movement while maintaining controlled mobility when needed.
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 enables safe and stable rotation or swinging of the chair device without altering existing parts, reducing the risk of accidental movement and improving safety, especially for elderly users.
Implementation Method 1
the center seat of the star-shaped base may be lowered to the ground due to the rotatability of the extending arm. Since the user applies a force on the chair, a static friction generated by the force on the center seat can avoid the accidental rolling or the accidental movement of the chair
Data Source
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AI summary
Disclosed are a chair device and a star-shaped base (3) thereof, in particular capable of being used for office chairs, work chairs, stools or standing auxiliary devices, the star-shaped base comprising a center seat (4) and a plurality of extending arms (5) mounted on the center seat (4), wherein the extending arms (5) are used for the star-shaped base (3) to be placed on the ground, and at least one of the extending arms (5) is hinged to the center seat (4) and can rotate relative to the center seat (4). A chair seat of the chair device can rotate or swing, while parts mounted at an upper end of a chair column do not need to be modified, and particularly, a supporting structure, a chair support for the chair seat to be placed, and the chair seat itself do not need to be modified.