Articulated Tripartite Sofa Bed for Simplified Conversion Mechanism
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Solution Overview
Problem
Existing sofa beds often require complex mechanisms that are prone to failure, are cumbersome to convert, and lack structural stability, especially when transitioning from a sofa to a bed, compromising comfort and ease of use.
Innovation Solution
A sofa bed with an articulated tripartite structure comprising a front, intermediate, and rear module, connected by two longitudinal rotation axes, allowing for a simple and stable conversion between sofa and bed configurations using a torque force mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex gears and locking systems are used for the backrest mechanism, then the sofa bed can maintain stable positions, but the mechanism becomes prone to failure and jams
Solution Approach 1:
The sofa bed is divided into three separate modules (front module, intermediate module, rear module) that can be independently positioned and locked. Each module has its own locking mechanism that operates independently, simplifying the overall system while maintaining stability. The segmentation allows each component to be optimized for its specific function without the complexity of a single integrated mechanism.
Solution Approach 2:
The conversion mechanism uses dynamic positioning where modules can be easily moved between sofa and bed configurations through simple lifting and locking actions. The system transitions from a static, complex gear-based mechanism to a dynamic system where modules can be repositioned and locked in place, reducing mechanical complexity while maintaining reliability through the locking system.
2Ease of manufacture
If the sofa bed structure is made with lightweight tubular material, then it is easier to package and assemble, but it lacks the necessary solidity for comfortable double bed function
Solution Approach 1:
The structure is divided into three separate modules that can be individually assembled and packaged. Each module uses lightweight tubular material for ease of assembly, but the overall structural solidity is achieved through the interconnection of modules and the distribution of load across multiple components rather than relying on a single heavy frame.
Solution Approach 2:
The sofa bed combines lightweight tubular materials with strategic reinforcement elements and connection mechanisms. The modular design allows different parts to use different material properties - lightweight tubes for the frame with additional support elements where structural integrity is critical, creating a composite structure that balances weight and strength.
3Adaptability or versatility
If the backrest is made mobile for conversion, then the sofa can transform into a bed, but the locking system requires significant lifting effort to release
Solution Approach 1:
The locking system is segmented into individual locks for each module rather than a single complex locking mechanism. Each module can be independently unlocked and repositioned, distributing the conversion effort across multiple simple actions rather than requiring significant force to release a single locked system.
Solution Approach 2:
The conversion mechanism uses dynamic lifting and locking where modules are designed to be easily lifted to specific positions and then locked in place. The system transitions from requiring significant continuous lifting force to a series of small, controlled lifting movements followed by secure locking, making the conversion process more manageable and less effortful.
4Ease of operation
If the seat width is limited for comfortable sitting, then the user can sit with back resting and legs bent, but the bed width becomes insufficient when converted
Solution Approach 1:
The sofa bed uses three separate modules that can be arranged in different configurations. When in sofa mode, the modules are arranged to provide optimal sitting width and backrest angle. When converted to bed mode, the same modules are repositioned and extended to create a wider sleeping surface, allowing the structure to adapt its effective width based on the intended use.
Solution Approach 2:
The conversion from sofa to bed involves changing the spatial arrangement of modules from a compact vertical configuration to an extended horizontal configuration. By utilizing the vertical space and articulation between modules, the design achieves both comfortable sitting dimensions and adequate bed width through dimensional transformation rather than increasing the physical size of individual components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a stable, easy-to-use conversion mechanism that maintains structural integrity and comfort, ensuring minimal effort and reduced complexity in transitioning between sofa and bed positions.
Implementation Method 1
said modules being connected together by a first longitudinal rotation axis and a second longitudinal rotation axis
Implementation Method 2
allowing for a simple and stable conversion between sofa and bed configurations using a torque force mechanism
Data Source
Figure 1~2
Figure 3
AI summary
The present description relates to a sofa bed, i.e., a sofa that can assume a flat, horizontal position, and thus serve as a bed. This application describes a sofa bed for placement on a flat surface, comprising an articulated tripartite structure, wherein the tripartite structure comprises a front module, an intermediate module, and a rear module, wherein each of said modules comprises two faces and at least one rigid element; wherein said modules are connected together by a first longitudinal rotation axis and a second longitudinal rotation axis, wherein the first longitudinal rotation axis connects an edge of the rear face of the front module to an edge of the front face of the intermediate module, and wherein the second longitudinal rotation axis connects an edge of the rear face of the intermediate module to an edge of the front face of the rear module, wherein the edge of the front face of the intermediate module and the edge of the rear face of the intermediate module are edges opposite to each other, wherein the forces exerted by the users on the first longitudinal rotation axis are transmitted to the front module and the forces exerted by the users on the second longitudinal rotation axis are transmitted to the rear module as a torque force, perpendicular to the plane connecting said longitudinal rotation axes.