Convertible Seating Unit Linkage for Low-Cost Bed Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing convertible sofa-beds are often expensive to manufacture due to intricate mechanisms and heavy construction, particularly in designs that require slots to guide the backrest, making them costly and difficult to produce.
Innovation Solution
A seating unit with a frame, backrest, body, hinge, and foot sections that utilize a series of pivotally interconnected links and flexible sheet support hinges to move between folded and unfolded positions, reducing the complexity and cost of the folding mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slots are used to guide the backrest in convertible sofa-beds, then the backrest positioning is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent removes the complex slot-guiding mechanism from the convertible sofa-bed design. Instead of using preformed slots in the arms to guide the backrest, the invention employs a different mechanism that eliminates this expensive and complex feature while maintaining the backrest's ability to move between positions.
Solution Approach 2:
The patent adopts a simplified mechanism that replicates the essential function of slot-guiding (backrest positioning) without copying the expensive slot structure. The design uses alternative guiding elements or mechanisms that achieve the same positioning function at lower manufacturing cost.
2Reliability
If a complete mattress is folded within the sofa cavity, then sleeping comfort is improved, but the weight and mechanism complexity increase
Solution Approach 1:
The patent combines the mattress with the sofa structure itself. Rather than having a separate, complete mattress folded within the sofa cavity, the design integrates the sleeping surface directly into the sofa's framework, eliminating the need for separate mattress storage and reducing overall mechanism complexity.
Solution Approach 2:
The sofa structure serves dual purposes: it functions as both seating and sleeping surfaces. The frame and support sections are designed to provide both sofa and bed functions, eliminating the need for a separate complete mattress and its associated folding mechanism.
3Adaptability or versatility
If multiple sections unfold to form a flat sleeping surface, then bed functionality is improved, but the folding mechanism complexity increases
Solution Approach 1:
The patent divides the sofa-bed into distinct functional sections (backrest, seat, and support sections) that can independently move between folded and unfolded positions. This segmentation allows each section to be optimized for its specific function while simplifying the overall folding mechanism.
Solution Approach 2:
The patent employs dynamic, movable connections between sections that allow smooth transitions between sofa and bed configurations. The folding mechanism uses articulated joints and linkages that enable sections to move relative to each other, creating a flat sleeping surface without requiring complex fixed structures.
Data Source
AI summary
A seating unit includes: a frame; a backrest section having a backrest cushion; body, hinge and foot sections sharing a common cushion; and a folding mechanism comprising a series of pivotally interconnected links configured and arranged to move the backrest, body, hinge and foot sections between folded and unfolded positions. In the unfolded position, the backrest, body, hinge and foot sections are generally horizontally disposed and serially aligned, with the backrest cushion and the common cushion facing upwardly. In the folded position, the backrest section is generally upright with the backrest cushion facing forwardly, the body section is generally horizontally disposed, the foot section overlies the body section, and the hinge section is generally vertically disposed and extends between the body and foot sections, and the common cushion is folded upon itself, such that a portion of the common cushion overlying the body section and a portion of the common cushion underlying the foot section are compressed against each other.