Star-Shaped Chair Base with Hinged Arms for Rotation and Stability
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Solution Overview
Problem
Existing chair devices, especially office chairs and stools, face challenges in rotating or swinging without complex structural modifications, which increase manufacturing costs and pose safety risks due to accidental movement when equipped with star-shaped bases.
Innovation Solution
A star-shaped base with extending arms hinged to a center seat, allowing for rotation and lowering, which generates static friction to prevent accidental rolling and provides a safe, stable seating experience by ensuring the center seat contacts the ground when loaded, thereby preventing unwanted movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If structural transformations are performed on existing chair devices to enable rotation and swinging, then the chair can rotate or swing in all directions, but the mechanical solution becomes more complicated and manufacturing costs increase
Solution Approach 1:
The patent applies the dynamics principle by making the star-shaped base movable through hinged extending arms that can rotate relative to the center seat. This allows the base to dynamically adapt its configuration - extending arms can swing outward to enable chair rotation and inward to provide stability, transforming a static base into a dynamic structure that automatically adjusts to user movements without complex mechanical systems
2Adaptability or versatility
If the star-shaped base is made movable to enable rotation, then the chair can rotate, but the chair may accidentally move or roll on the ground posing safety dangers
Solution Approach 1:
The patent uses dynamics by designing the extending arms to automatically change position based on load conditions. When the user sits on the chair, the weight causes the extending arms to swing inward and contact the ground, creating friction that prevents accidental rolling. When the user moves to enable rotation, the arms swing outward to allow movement. This dynamic adaptation resolves the contradiction between rotation capability and safety stability
Solution Approach 2:
The star-shaped base employs self-service through its automatic load-responsive mechanism. The extending arms automatically detect when load is applied and adjust their position accordingly - swinging inward to provide stability when loaded and outward to enable rotation when unloaded. This self-adjusting mechanism eliminates the need for external control systems while ensuring both safety and functionality
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 chair devices without altering the supporting structure above the chair column, enhancing user safety, particularly for the elderly, and can be applied to various chair types, including standing auxiliary devices.
Implementation Method 1
the center seat in the vertical direction can be lowered and can be tilted relative to a horizontal plane
Implementation Method 2
at least one extending arm is hinged to the center seat and can rotate relative to the center seat
Implementation Method 3
Through the roller, the chair device may move on the ground... 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
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.