Flexible Back Shell Seating with Matched Lumbar Deflection
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Solution Overview
Problem
Conventional seating arrangements often fail to provide adequate lumbar support and adjustability, leading to discomfort and poor posture, as they lack flexible and vertically adjustable components that can accommodate the natural curvature of the human spine.
Innovation Solution
A seating arrangement featuring a substantially rigid back frame with a flexible back shell and a lumbar assembly that is vertically adjustable, allowing the lumbar support surface to move between different positions to align with the user's spine, ensuring proper support and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid back frame is used to provide structural support, then structural stability is improved, but flexibility and adaptability to user spine curvature deteriorate
Solution Approach 1:
The backrest is divided into multiple independent components: a rigid back frame for structural stability, flexible strap portions for adaptability, and a separate lumbar assembly for targeted support. This segmentation allows each component to fulfill its specific function while working together as a unified system.
Solution Approach 2:
The seating arrangement combines rigid materials (back frame) with flexible materials (strap portions made of flexible material, lumbar assembly with deflectable components) to create a composite structure that exhibits both structural stability and flexibility, resolving the contradiction between these opposing properties.
2Adaptability or versatility
If lumbar support is made vertically adjustable to accommodate different spine curvatures, then adaptability is improved, but device complexity increases
Solution Approach 1:
The lumbar assembly is designed with dynamic characteristics, allowing it to deflect and adjust vertically in response to user weight and posture. The assembly can move between different vertical positions automatically or through simple control mechanisms, providing adaptability without requiring complex adjustment systems.
Solution Approach 2:
The lumbar assembly's vertical position is made variable, allowing it to change its parameter (vertical location) to match different user spine curvatures. This can be achieved through adjustable mechanisms or automatic positioning based on detected user characteristics, enhancing adaptability while managing complexity.
3Reliability
If the lumbar assembly deflects a similar distance to the lowermost strap portion, then comfort and support quality are improved, but manufacturing precision requirements increase
Solution Approach 1:
Both the lumbar assembly and lowermost strap portion are designed with specific local deflection characteristics tailored to their functions. The lumbar assembly provides targeted lumbar region support with controlled deflection, while the strap portions provide general back support. This localized optimization of deflection properties enhances comfort while allowing for practical manufacturing tolerances.
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 provides enhanced comfort and support by allowing the lumbar assembly to deflect similarly to the lowermost strap portion when a rearward force is applied, maintaining a smooth surface for the user and improving posture through adjustable lumbar support.
Implementation Method 1
the at least two strap portions including a lowermost strap portion configured to deflect a first distance when a rearwardly-directed force is exerted on the lowermost strap portion by a seated user
Implementation Method 2
the lumbar assembly configured to deflect a second distance when the rearwardly-directed force is exerted on the lumbar assembly by a seated user
Data Source
AI summary
A seating arrangement includes a rigid back frame, a flexible back shell coupled to the back frame and including a pair of vertical side portions and at least two strap portions extending laterally between the side portions and including a forwardly-facing surface configured to support a back of a seated user, the at least two strap portions including a lowermost strap portion, the lowermost strap portion configured to deflect a first distance when a rearwardly-directed force is exerted on the lowermost strap portion by a seated user, and a lumbar assembly supported from the back frame and configured to support the lumbar region of a back of a seated user, the lumbar assembly configured to deflect a second distance when the rearwardly-directed force is exerted on the lumbar assembly by a seated user, wherein the first distance and the second distance are substantially similar.