Dynamic Seat and Backrest Motion for Lumbar Support
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Solution Overview
Problem
Prolonged sitting in conventional chairs leads to physical stress, circulatory problems, and increased risk of age-related diseases due to inadequate support and immobilization of joints, resulting in chronic inflammation and potential health issues like heart disease, diabetes, and cancer.
Innovation Solution
A seat design featuring a back-supporting surface and a seating surface that are independently movable along a path, allowing for adjustments in angle and position to promote spinal mobilization and reduce pressure on the user's body, incorporating mechanisms like rotatable back gliders, adjustable height, and spring biases to facilitate continuous movement and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seating surface is fixed in position, then the structure is simple and stable, but the user experiences physical stress, circulatory problems, and joint immobilization during prolonged sitting
Solution Approach 1:
The patent applies dynamics by making the seating surface movable along a defined path instead of fixed. The seat pan is configured to move relative to the backrest, enabling continuous adjustment of the seating position. This dynamic configuration allows the user to change posture and mobilize joints during prolonged sitting, preventing circulatory problems and physical stress while maintaining structural feasibility through guided motion paths.
Solution Approach 2:
The patent segments the seat into independently movable components: the seat pan and the backrest are separated and can move relative to each other along defined paths. This segmentation allows each component to be optimized independently - the seat pan for forward/backward motion on an inclined path, and the backrest for rotational movement - thereby reducing overall system complexity while improving user health outcomes.
2Reliability
If the back-supporting surface is fixed relative to the seating surface, then the manufacturing is simpler, but the lumbar support becomes inadequate during prolonged sitting
Solution Approach 1:
The back-supporting surface is made dynamically adjustable through rotational movement capability. The backrest can rotate about a horizontal axis, allowing the lower portion to maintain contact with the user's lumbar region during prolonged sitting. This dynamic adjustment ensures continuous lumbar support effectiveness without requiring complex active control systems, as the motion is guided by mechanical constraints.
3Reliability
If the seating surface allows continuous movement, then joint mobilization and blood flow are improved, but the device requires more complex mechanisms for control and stability
Solution Approach 1:
The patent implements periodic action through the inclined path configuration that naturally encourages rhythmic forward and backward movement of the seat pan. The incline creates a gravitational component that facilitates periodic motion, promoting joint mobilization and blood flow without requiring complex active control mechanisms. The user's body weight and gravity work together to create the beneficial periodic motion pattern.
Solution Approach 2:
The movement control mechanism utilizes the user's own body weight and gravitational force to drive the motion along the inclined path. The seat pan is positioned on an incline such that the user's weight naturally creates a component of force along the path, enabling self-powered movement that improves circulation and joint health without requiring external motors or complex control systems.
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 seat design enhances blood flow, strengthens core muscles, and reduces the risk of injury by promoting joint mobilization and metabolic activity, thereby mitigating the negative effects of prolonged sitting and improving overall health and comfort.
Implementation Method 1
A spring biases the back-supporting surface to move away from the seating surface in the direction perpendicular or substantially perpendicular to the seating surface
Implementation Method 2
The seating surface is biased to move toward the back-supporting surface under the force of gravity
Data Source
AI summary
Among other things, a seat includes a back-supporting surface; and a seating surface movable along a path toward and away from the back-supporting surface. At least part of the back-supporting surface is movable to enable a lower portion of the back-supporting surface to move substantially along the path.