Wave-Shaped Folding Sofa Armrests for Stable Forearm Support
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Solution Overview
Problem
Existing folding round chairs, also known as crescent seats, provide inadequate support for the forearms, leading to discomfort due to pressure on the thighs and forearm sliding, as they lack effective support structures.
Innovation Solution
A folding sofa design featuring curved U-shaped armrest bars with a wavelike upward curvature, reinforced horizontal support bars, and a movable hinge structure with slide stops, providing stable support for the forearms and preventing sliding, while maintaining a comfortable seating position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple round seat hoop structure is used, then the chair has simple structure and unique look, but it provides poor support for forearms and causes pressure on thighs
Solution Approach 1:
The seat hoop is segmented into multiple functional sections: front support bars with armrest sections, rear support bars, and connecting bars. This segmentation allows each section to be optimized for its specific function while maintaining overall structural simplicity.
Solution Approach 2:
The armrest sections are designed with curved surfaces that conform to the natural shape of forearms. The curved design provides ergonomic support and prevents sliding, transforming the simple round hoop into a comfort-optimized structure.
2Shape
If the front support bars are tilted to form a radar-like shape, then the chair achieves an innovative shape and easy folding, but it creates pressure on thighs and causes forearm sliding
Solution Approach 1:
Different sections of the support bars have different functional qualities. The armrest sections feature curved surfaces for forearm support, while the connecting sections maintain the tilted radar-like shape for structural integrity and folding capability. This local differentiation resolves the contradiction between shape and comfort.
Solution Approach 2:
The armrest sections are positioned at a different vertical dimension compared to the main seat hoop. By elevating the armrests to a higher position with curved surfaces, the design provides forearm support without compromising the overall radar-like shape and folding mechanism.
3Stability of the object's composition
If horizontal supports are added to strengthen the front support bars, then the structural stability is improved, but the device complexity increases
Solution Approach 1:
The horizontal support bars are merged with the armrest sections and rear support bars into an integrated structure. This combining approach provides the necessary structural stability while avoiding the addition of separate, complex support components.
Solution Approach 2:
The connecting bars serve multiple functions: they provide horizontal support for structural stability, connect the front and rear support bars, and maintain the folding mechanism. This multi-functionality reduces the need for additional components, keeping the overall structure simple.
Data Source
AI summary
A folding sofa that includes symmetrical armrest bars on both sides, front support bars and rear support bars, as well as a fabric seat. The armrest bar consists of a curved U-shaped bar with a symmetrical armrest section and U-shaped portion. The armrest section is formed in a wave shape that starts low in the front and rises high in the rear, with the front lower portion also being attached to an armrest auxiliary bar to provide support for resting the forearms. The rear support bars, after hinging to the armrest bars, have extended sections protruding forward to support the front edge of the fabric seat cushion.