Sitting ball
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Solution Overview
Problem
Hollow, gas-filled seating devices with outer shells tend to roll away due to their round shape, and existing weight fixation methods are either difficult to remove or restrict the seating area's variability, making them unsuitable for both seated use and gymnastics/sports applications.
Innovation Solution
A seating device with a flexible shell and a clamping mechanism that uses a weight between the shell and hollow body, allowing the weight to be displaced and easily removable, utilizing a material with a lower coefficient of expansion than the hollow body material, and designed to align the seating device with an eccentric force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the weight is permanently fixed to the shell or hollow body, then the seating device achieves stable positioning, but the seat becomes unsuitable for gymnastics and sports applications requiring flexibility
Solution Approach 1:
The weight body is made movable within the hollow body through a guiding mechanism, allowing it to be repositioned or removed as needed. This dynamic arrangement enables the seat to transition between stable positioning mode (weight fixed at bottom) and flexible gymnastics mode (weight movable or removed), resolving the contradiction between stability and adaptability.
2Stability of the object's composition
If the weight is secured in a pocket in the cover, then the weight remains in a fixed position, but the seating area cannot be varied and the weight is difficult to remove when the hollow body is inflated
Solution Approach 1:
The weight securing mechanism is separated from the cover structure, with the weight body placed inside the hollow body rather than attached to the cover. The guiding mechanism allows the weight to be independently positioned and removed without deflating the hollow body, making weight adjustment easy while maintaining stable positioning during use.
3Strength
If the hollow body is made of stretchable material, then the hollow body can be inflated to provide seating support, but the weight cannot be easily clamped between the shell and hollow body
Solution Approach 1:
The guiding mechanism acts as an intermediary between the weight body and the hollow body, providing a clamping structure that secures the weight without requiring permanent attachment. The guide allows the weight to be clamped in place during inflation while maintaining ease of installation and removal, resolving the contradiction between seating strength and manufacturing ease.
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 seating device maintains a stable position without restricting flexibility, enabling use as both a seat and in gymnastics/sports, with minimal impact noise and no visible weight, while allowing easy weight adjustment for varying stability needs.
Implementation Method 1
clamped between the shell and the hollow body by means of a pressure force generated by the hollow body filled with the gaseous medium
Implementation Method 2
the seating device or the seating ball is aligned towards the base by an eccentric force generated by the weight body
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a sitting device, comprising: an ellipsoidal hollow body (2), which is filled with a gaseous medium and has an expandable hollow body wall; and a casing (1), which encloses the hollow body (2) and is made of flexible material. The casing (1) can be pulled onto the hollow body (2) and pulled off same. The sitting device further comprises a weight body (3) used for positional alignment. The weight body (3) is fastened in a clamping manner between the hollow body (2) and the casing (1) because of a compressive force acting between the hollow body (2) and the casing (1). Furthermore, the present invention relates to a weight body (3) for use in a sitting device according to the invention.