Segmented Chair Back Shell for Adaptive Lumbar Support
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Solution Overview
Problem
Existing office chair designs lack effective flexibility and lumbar support, particularly in the transition between upright and reclined positions, which can lead to discomfort and inadequate spinal alignment for users.
Innovation Solution
A seating arrangement featuring a back assembly with a substantially rigid frame and a flexible back shell that includes laterally-extending slots defining ribs, allowing for adjustable lumbar support and maintaining structural integrity across positions, coupled with a recline mechanism that adjusts the distance between ribs to accommodate user posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid back frame is used to maintain structural integrity, then strength is improved, but flexibility and lumbar support are worsened
Solution Approach 1:
The back shell is divided into multiple laterally-extending ribs that are spaced apart to create slots. This segmentation allows the back shell to flex laterally while maintaining overall structural integrity through the rigid frame connection.
Solution Approach 2:
The back shell has different flexibility characteristics in different regions. The laterally-extending ribs provide localized flexibility in the lumbar support area while the overall structure maintains rigidity through the frame connection.
2Adaptability or versatility
If a flexible back shell is used to provide lumbar support, then adaptability is improved, but structural integrity is worsened
Solution Approach 1:
The back shell is designed as a flexible structure with laterally-extending slots that allow it to conform to the user's lumbar region. This flexible shell provides adaptive lumbar support while the connection to the rigid back frame maintains overall structural integrity.
3Adaptability or versatility
If laterally-extending slots are added to the back shell, then flexibility is improved, but device complexity is worsened
Solution Approach 1:
The back shell is segmented into multiple laterally-extending ribs that define slots between them. This segmentation approach provides flexibility through the slots while using a relatively simple rib structure rather than complex mechanisms.
Solution Approach 2:
The back assembly combines a rigid back frame with a flexible back shell made of composite or composite-like structure (multiple ribs). This composite approach achieves both flexibility and structural integrity without requiring overly complex design.
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
Enhances user comfort by providing adjustable lumbar support and maintaining spinal alignment as the chair transitions between upright and reclined positions, ensuring optimal ergonomic support throughout various seating configurations.
Implementation Method 1
a substantially flexible back shell including a front surface and a rear surface opposite the front surface, a plurality of laterally-extending slots that extend between the front surface and the rear surface and that cooperate to define a plurality of laterally-extending ribs therebetween
Data Source
AI summary
A seating arrangement includes a base, a seat assembly operably coupled to the base, and a back assembly that includes a substantially rigid back frame including a pair of side portions spaced from one another and extending upward from the base, and a substantially flexible back shell including a front surface and a rear surface opposite the front surface, a plurality of laterally-extending slots that extend between the front surface and the rear surface and that cooperate to define a plurality of laterally-extending ribs therebetween, where a pair of laterally-extending ribs of the plurality of laterally-extending ribs are connected to one another via a vertically-extending rib located at a substantial midpoint across a width of the back shell, and wherein the back shell is coupled to each of the side portions of the back frame at locations above the plurality of laterally-extending slots.