Chair Back Support Adjustment for Front-Seat Sitting Comfort
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Solution Overview
Problem
Conventional chairs do not effectively support an occupant's back when they sit on the front portion of the seat cushion, leading to fatigue and discomfort, particularly for individuals who frequently lean forward, such as card dealers.
Innovation Solution
A chair with a reconfigurable back support that can be adjusted to move forwardly or rearwardly, allowing it to support the occupant's back when sitting upright, even on the front portion of the seat cushion, through the use of an adjustment mechanism that biases the back support forward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the back support is positioned in a fixed rearward location, then the chair structure is simple, but the occupant experiences back fatigue and discomfort when sitting on the front portion of the seat cushion
Solution Approach 1:
The back support is made movable rather than fixed, allowing it to be repositioned between a rearward position (for normal sitting) and a forward position (for front-seat sitting). This dynamic positioning capability resolves the contradiction by adapting the back support location to match the occupant's sitting position, eliminating back fatigue without requiring permanent structural complexity
Solution Approach 2:
The position parameter of the back support is changed from a fixed value to an adjustable range. The back support can be positioned at multiple locations along the seat cushion, allowing optimization of support location based on sitting position. This parameter adjustment enables the system to maintain simplicity while gaining adaptability
2Ease of operation
If the occupant slides rearwardly along the seat cushion to contact the back support, then back support is achieved, but time is lost and convenience is reduced
Solution Approach 1:
The back support is pre-positioned in a forward location that anticipates the occupant's needs when sitting on the front portion of the seat. This preliminary positioning eliminates the need for the occupant to slide rearwardly to find support, providing immediate back support upon sitting and reducing adjustment time to zero
3Object-affected harmful factors
If the back support is positioned forward to support the occupant on the front seat portion, then back fatigue is reduced, but the chair's structural complexity increases
Solution Approach 1:
The back support uses a movable mechanism that allows repositioning between forward and rearward positions. This dynamic capability enables the system to provide forward positioning (reducing back fatigue) only when needed, while maintaining a simple fixed-structure appearance when in the rearward position, thus balancing comfort benefits with structural simplicity
Data Source
AI summary
An adjustable chair can support an occupant that sits on a front portion of a seat cushion. When the user leans back, the chair can provide back support without requiring that the user slide rearwardly along the seat cushion, thereby providing back support to minimize, limit, or substantially eliminate lower back fatigue, discomfort, or the like. A back support of the chair can be located at a desired forward/rearward position based on the user's position on the seat. In some settings, the chair can be used by a card dealer who tends to sit on a forward portion of the seat when dealing cards. The back support can be positioned to comfortably support the dealer's back when, for example, the dealer sits generally upright. The chair can also be used by other individuals that frequently sit on the front of the seat cushion.