Foldable sofa-bed
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Solution Overview
Problem
Existing convertible furniture units that function as beds are often heavy and require intricate mechanisms for unfolding and folding, lacking a complete mattress and efficient weight distribution.
Innovation Solution
A foldable sofa-bed design with a base, seat, and subseat sections, each with a cushion and underlying panel, featuring a bed folding mechanism that moves between a folded and unfolded position, with angled edges for mating and a leg folding mechanism for stabilization, reducing weight and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete mattress is folded within the cavity of the sofa, then the sofa provides a comfortable sleeping surface, but the sofa becomes quite heavy and requires an intricate mechanism
Solution Approach 1:
The bed is divided into multiple sections (head section, intermediate section, seat section) that can be folded independently. This segmentation allows the bed to be stored in a compact configuration within the sofa cavity while reducing the weight that needs to be moved during folding operations, as each section is lighter than a complete mattress would be.
Solution Approach 2:
The folded bed sections are nested within the cavity of the sofa base. The head and intermediate sections are positioned in the cavity while the seat section serves as the sofa seat, creating a space-efficient storage solution that eliminates the need for a separate mattress while maintaining a manageable weight distribution.
2Reliability
If a complete mattress is folded within the cavity of the sofa, then the sofa provides a comfortable sleeping surface, but the mechanism becomes intricate
Solution Approach 1:
The folding mechanism is segmented into simpler components that control each bed section independently. This segmentation reduces the overall complexity by breaking down the intricate mechanism into manageable parts that can be operated separately, while still providing the complete sleeping surface when unfolded.
Solution Approach 2:
The bed sections are designed to fold and unfold using their own structural characteristics and gravity, reducing the need for complex mechanical assistance. The segmented design allows each section to serve its own folding needs, simplifying the overall mechanism while maintaining the ability to provide a complete sleeping surface.
3Weight of moving object
If separate sections are used to form the sleeping surface, then the sofa weight is reduced, but the sections require precise alignment to form a flat surface
Solution Approach 1:
Each bed section is designed with specific local characteristics (angled edges, complementary shapes) that ensure proper alignment when assembled. The head section has a front edge angled upward, the intermediate section has angled edges, and the seat section has a rear edge angled downward, creating local features that guide precise alignment without requiring high manufacturing precision across the entire structure.
Solution Approach 2:
The bed sections utilize asymmetric designs with specific angular orientations (front edge of head section angled upward, rear edge of seat section angled downward) that naturally guide the sections into proper alignment during assembly. This asymmetric configuration reduces the tolerance requirements compared to symmetric designs, as the angled edges self-align during the folding and unfolding process.
Data Source
AI summary
A foldable sofa-bed includes: a base having a cavity; a bed with a seat section and a subseat section, each of the seat section and the subseat section including a cushion and an underlying panel; and a bed folding mechanism attached to the base, subseat and seat. The bed folding mechanism is configured to move the bed between a folded position, in which the seat and subseat sections are generally horizontally disposed and positioned in vertically stacked relationship in the cavity of the base, with the seat and subseat cushions facing upwardly, and an unfolded position, in which the seat and subseat sections are horizontally disposed and aligned to form a sleeping surface.