Stacking Chair Frame Layout for Stable Cushion-Free Nesting
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Solution Overview
Problem
Existing stacking chair designs either compromise stability due to resilient seat cushions supporting upper chairs or impose design limitations with inverted U-shaped leg members, leading to wear and limited aesthetic freedom.
Innovation Solution
A chair frame design featuring a seat ring supported by front and rear legs, with a stack ring spaced below and interconnected with these legs, allowing frame-on-frame stacking without the need for inverted U-shaped leg members, where the stack ring of an upper chair is supported by the seat ring of a lower chair, utilizing angled rear legs for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If seat cushions are used to support upper chairs in a stack, then design freedom is increased, but stack stability is compromised
Solution Approach 1:
The chair frame is segmented into distinct functional elements: a seat ring for supporting the seat cushion, a stack ring for supporting upper chairs, and leg members for structural support. This segmentation allows each element to perform its specific function optimally without compromising overall performance.
Solution Approach 2:
The stack ring acts as an intermediary element between the seat cushion and the upper chair. Instead of the seat cushion directly supporting the upper chair (which compromises stability), the stack ring mediates this support function, allowing the seat cushion to maintain its cushioning properties while the stack ring provides stable structural support.
2Stability of the object's composition
If inverted U-shaped leg members are used for stacking, then a stable stack is achieved, but design limitations are imposed
Solution Approach 1:
The chair frame is segmented into distinct functional elements: a seat ring for supporting the seat cushion, a stack ring for supporting upper chairs, and leg members for structural support. This segmentation allows each element to perform its specific function optimally without compromising overall performance.
Solution Approach 2:
The stack ring serves multiple functions: it provides a stable support surface for upper chairs, maintains design freedom for the seat cushion and backrest, and can be integrated with various leg member configurations. This multi-functionality resolves the contradiction between stability and design freedom.
3Adaptability or versatility
If seat cushions support upper chairs in a stack, then additional design freedom is allowed, but wear on seat cushions occurs
Solution Approach 1:
The chair frame is segmented into distinct functional elements: a seat ring for supporting the seat cushion, a stack ring for supporting upper chairs, and leg members for structural support. This segmentation allows each element to perform its specific function optimally without compromising overall performance.
Solution Approach 2:
The stack ring acts as an intermediary element between the seat cushion and the upper chair. Instead of the seat cushion directly supporting the upper chair (which causes wear), the stack ring mediates this support function, allowing the seat cushion to maintain its cushioning properties without experiencing wear from stacked chairs.
Data Source
AI summary
A chair is designed to stack generally vertically with a number of like chairs. A chair frame has a pair of front legs and a pair of rear legs and a generally horizontal seat frame element that is supported by the front and rear legs. A generally horizontal stack frame element is interconnected with the front and rear legs of the chair frame and is spaced below the seat ring. A seat is supported by the chair frame. When the chair is stacked on a like chair, the stack frame element of the upper chair is disposed on and supported by the seat frame element of the lower chair.