Three-dimensional rocking chair with variable curvature base for abdominal exercise
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Solution Overview
Problem
Conventional rocking chairs and exercise apparatus fail to provide effective, low-intensity, and secure means to improve abdominal core strength, as they lack a three-dimensional base that can rock in all directions with distinct radii of curvature, which is essential for continuous vestibular stimulation and muscle engagement.
Innovation Solution
A three-dimensional chair base with a rectangular shape featuring a minimum radius of curvature in the central portion, a smooth transition to larger radii in the peripheral portions, and maximum radii in the corner portions, allowing for a three-dimensional rolling motion that engages abdominal muscles without excessive spinal flexion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional two-dimensional rocker base is used, then the chair provides simple back-and-forth motion, but it fails to provide effective abdominal exercise and continuous vestibular stimulation
Solution Approach 1:
The patent transitions from a conventional two-dimensional rocker base to a three-dimensional variable curvature base that enables rocking motion in multiple directions (forward-backward, left-right, and diagonal). This dimensional expansion allows the chair to provide comprehensive vestibular stimulation and engage abdominal muscles more effectively, resolving the contradiction between exercise effectiveness and motion versatility.
Solution Approach 2:
The patent implements a dynamic base structure with variable radius of curvature that adapts to different rocking angles and directions. The radius of curvature changes continuously across the base surface, allowing the chair to provide natural, smooth motion in all directions while maintaining exercise effectiveness. This dynamic characteristic enables the chair to overcome the limitation of fixed-motion conventional rockers.
2Adaptability or versatility
If a spherical base with uniform radius of curvature is used, then the chair can rock in all directions, but it lacks distinct radii of curvature in central, peripheral, and corner portions reducing exercise effectiveness
Solution Approach 1:
The patent applies local quality by creating different radius of curvature characteristics in different regions of the base. The central portion has one radius of curvature, the peripheral portions have another, and the corner portions have yet another. This localized variation in curvature properties ensures that each region of the base contributes differently to the rocking motion, maximizing abdominal muscle engagement while maintaining versatile rocking capability.
3Reliability
If ballast members are added to prevent tipping, then the chair becomes more stable, but it increases weight and complexity
Solution Approach 1:
The patent uses the variable curvature geometry of the three-dimensional base itself to provide stability rather than adding separate ballast members. The specific curvature profile of the base creates natural stability characteristics that prevent tipping while keeping the chair lightweight. The curved surface geometry inherently guides the center of gravity in a way that provides anti-tip stability without additional weight.
4Ease of operation
If the radius of curvature is increased in all areas, then the chair provides smoother motion, but it reduces the righting moment and exercise intensity
Solution Approach 1:
The patent resolves this contradiction by applying different radius of curvature values to different regions of the base. Areas requiring smooth motion have larger radii of curvature, while areas requiring greater righting moment and exercise intensity have smaller radii. This localized differentiation allows the chair to provide both smooth motion and adequate exercise intensity simultaneously.
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 chair's variable curvature base facilitates a natural rocking motion that strengthens abdominal muscles, enhances lateral muscle engagement, and provides secure and enjoyable exercise, reducing the risk of falls and improving balance reflexes without requiring constant assistance.
Implementation Method 1
The vertical distance between the seated user center of gravity and the rocker center of curvature functions as a pendulum with a specific natural frequency of oscillation
Implementation Method 2
The vertical distance between the seated user center of gravity and the rocker center of curvature functions as a pendulum with a specific natural frequency of oscillation
Implementation Method 3
the height of the center of this minimum radius of curvature is above the center of gravity of the seated user and chair, which provides an integral positive righting moment without added ballast
Data Source
AI summary
An omnidirectional rocking chair for abdominal exercise has a rectangular support base with a convex lower support surface with variable radii of curvature. The chair back supports only the user's lower back. Rocking the chair develops outward momentum in the mass of the user's upper back, arms and head. The minimum lower support surface radius of curvature is in its central portion and the center of that curvature is above the center of gravity of the seated user and chair. The peripheral portions of the lower support surface have larger radii of curvature. The corner portions of the lower support surface have maximum radii of curvature. The effect of progressive increase in support surface radius of curvature is to increase righting moment in the rocking motion where the respective larger radii portions contact the floor. This acts to decelerate outward rocking motion in the chair seat and user's lower back in opposition to the developed outward momentum in the mass of the user's upper back, arms, and head, which engages user abdominal trunk muscles.