Sectioned Sofa-Bed Folding Mechanism for Full Mattress Conversion
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Solution Overview
Problem
Existing convertible sofa-beds are often heavy and require intricate mechanisms for unfolding and folding, and lack a complete mattress, making them less convenient for multifunctional use.
Innovation Solution
A foldable sofa-bed design with separate head, intermediate, and seat sections, each with a respective cushion, featuring a bed folding mechanism that maintains the intermediate section's orientation and uses a linear power actuator to move between folded and unfolded positions, forming a king-sized bed when unfolded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complete mattress is folded within the cavity of the sofa, then the sofa provides a complete bed for guests, but the sofa becomes quite heavy and requires an intricate mechanism
Solution Approach 1:
The bed is divided into three separate sections (head section, intermediate section, and seat section) that can be independently folded and stored. This segmentation allows each section to be compactly positioned within the sofa cavity while simplifying the overall folding mechanism compared to storing a complete mattress.
Solution Approach 2:
The head, intermediate, and seat sections are nested within the sofa cavity in a vertically stacked relationship when folded. The head section is positioned below the intermediate section, which is below the seat section, creating a compact nested configuration that eliminates the need for a separate mattress storage system.
2Ease of operation
If separate sections are used to form a mattress-like sleeping surface, then the sofa is lighter and easier to operate, but it lacks a complete mattress
Solution Approach 1:
The head section, intermediate section, and seat section are merged together in the unfolded position to form a complete mattress-like sleeping surface. Each section includes cushioning elements that combine to provide comfort comparable to a complete mattress, while maintaining the ease of operation of separate sections.
Solution Approach 2:
The seat section serves dual purposes: it functions as the seating surface of the sofa during daytime and as part of the bed structure at night. This multi-functionality eliminates the need for a separate mattress while maintaining comfort and ease of operation.
3Device complexity
If the intermediate section changes orientation during folding, then the folding mechanism has more flexibility, but the user experience is compromised
Solution Approach 1:
The intermediate section is designed to maintain a fixed horizontal orientation throughout the folding and unfolding process, while the head section dynamically changes from a vertical to horizontal position. This dynamic design simplifies the folding mechanism by eliminating the need to reorient the intermediate section, improving user experience.
Solution Approach 2:
The bed folding mechanism acts as an intermediary that coordinates the movement of the head and seat sections while keeping the intermediate section stationary in orientation. This intermediary mechanism simplifies the overall folding process by managing the complexity of coordinating multiple sections without requiring the intermediate section to change orientation.
Data Source
AI summary
A foldable sofa-bed includes: a base with an internal cavity and a rear member; a foldable bed that includes separate and distinct head, intermediate and seat sections, each with a respective cushion, wherein in a folded position, the intermediate and seat sections are generally horizontally disposed and positioned in vertically stacked relationship, with the intermediate and seat cushions facing generally upwardly, and the head section is generally vertically disposed and positioned adjacent the rear wall of the base, and in an unfolded position, the head, intermediate and seat sections are generally horizontally disposed in serial alignment; and a bed folding mechanism that is attached to the base and the head, intermediate and seat sections that controls the movement of the bed between the folded and unfolded positions. In moving from the folded to the unfolded position, the intermediate section maintains generally the same orientation.