Active Engagement Chair with Multi-Axis Pivot for Muscle Activation
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Solution Overview
Problem
Conventional chairs fail to actively engage the user's muscles effectively, leading to poor posture and reduced muscle activation during sitting, which can result in discomfort and long-term health issues.
Innovation Solution
A chair design featuring multiple pivot axes and dynamic components, including a pelvic nest, thigh pad, and back support, that apply dynamic pressure to engage muscles, maintain a neutral posture, and resist posterior rotation of the pelvis, utilizing a nesting cable system and springs to adjust positions and apply pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional chairs are used, then structural simplicity is maintained, but muscle engagement and posture support deteriorate
Solution Approach 1:
The chair employs multiple pivot axes (thigh pad pivot axis, lower back support pivot axis, nesting cable pulley axis) that allow dynamic adjustment of support surfaces. The thigh pad and lower back support can pivot independently to follow natural body movements, maintaining muscle engagement while adapting to user posture changes. This dynamic mechanism resolves the contradiction by enabling active muscle engagement through controlled movement rather than static rigidity.
Solution Approach 2:
The chair divides the support system into segmented components: thigh pad assembly, pelvic nest, lower back support assembly, and upper back support assembly. Each segment can pivot independently around its own axis, allowing localized adjustment without affecting the entire structure. This segmentation enables complex muscle engagement functionality while maintaining manageable structural complexity through modular design.
2Ease of operation
If dynamic pressure application is implemented, then muscle engagement improves, but device complexity increases
Solution Approach 1:
The chair utilizes the user's own body weight and natural posture adjustments to drive the dynamic pressure application mechanism. As the user shifts position or adjusts posture, the thigh pad and lower back support pivot automatically following body movements, creating dynamic pressure patterns without requiring external power sources or complex control systems. This self-service approach achieves effective muscle engagement while minimizing mechanism complexity.
Solution Approach 2:
The nesting cable system acts as a counterweight mechanism, using spring tension to balance the weight of movable components (thigh pad, lower back support). This allows the supports to pivot smoothly and return to neutral positions without requiring powerful motors or complex actuation systems. The counterweight principle enables dynamic pressure application while keeping the overall mechanism simple and maintenance-free.
3Adaptability or versatility
If multiple pivot axes are used, then adaptability to body movement improves, but mechanical complexity increases
Solution Approach 1:
Each pivot axis in the chair serves multiple functions: the thigh pad pivot axis not only accommodates thigh movement but also controls the nesting cable tension to adjust lower back support position. The lower back support pivot axis simultaneously follows lumbar curvature and regulates pelvic nest orientation. This multi-functionality reduces the need for separate control mechanisms for each degree of freedom, achieving high adaptability with reduced overall complexity.
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 design actively engages the user's muscles, maintaining a neutral posture and reducing pressure on the thighs and lower back, thereby enhancing comfort and promoting better body alignment and balance.
Implementation Method 1
downward force on the pelvic nest arising from the user sitting in the pelvic nest generates tension in the nesting cable to pivot each of the thigh pad and the lower back support into the engaged condition
Implementation Method 2
a thigh return spring biasing the thigh pad into the ingress position and a sacral return spring biasing the lower back support into the ingress position
Data Source
AI summary
A chair includes a lower chair and an upper chair. The lower chair includes a tilt-swivel mechanism defining a vertical swivel axis, a yoke, and a column extending between the tilt-swivel mechanism and the yoke. The upper chair is pivotably mounted to the yoke about a horizontal upper chair pivot axis. The upper chair includes a seat adapted to cradle the ischial tuberosities of a user.