Sofa Wall Bed Mechanism Using Gas Struts to Reduce Pivot Stress
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Solution Overview
Problem
Existing sofa bed mechanisms are complex, difficult to assemble, and unable to support a full-size bed, leading to limited accommodation and reliability issues due to high stresses on pivoting points.
Innovation Solution
A simplified sofa bed design using a carcass with rotatable bed and sofa bases, gas struts, and easily assembled mount assemblies that allow for transformation between vertical and horizontal positions, utilizing readily available 'off-the-shelf' parts to support a full-size bed with reduced stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex mechanism is used to enable the bed to rotate and transform between sofa and bed positions, then the transformation function is achieved, but the device complexity increases and assembly becomes difficult
Solution Approach 1:
The mechanism is divided into separate functional modules: mount assemblies with bearing plates for rotation, gas struts for positioning, and articulated connections. Each module performs a specific function and can be assembled independently, reducing overall complexity while maintaining transformation capability.
Solution Approach 2:
The mount assemblies serve multiple functions: they provide rotation support, define the bed base position, and accommodate gas strut connections. The bearing plates simultaneously support the bed base and enable rotational movement, reducing the need for separate components.
2Adaptability or versatility
If a complex mechanism with multiple articulated parts is used, then the transformation capability is achieved, but the difficulty of assembly increases
Solution Approach 1:
The mechanism is divided into separate functional modules: mount assemblies with bearing plates for rotation, gas struts for positioning, and articulated connections. Each module performs a specific function and can be assembled independently, reducing overall complexity while maintaining transformation capability.
Solution Approach 2:
The design uses standard off-the-shelf components such as gas struts and bearing plates that are readily available and easily replaced. This standardization simplifies assembly and maintenance while maintaining transformation functionality.
3Quantity of substance
If the bed base is made large enough to support a full-size bed, then the accommodation capacity is improved, but the stress on pivoting points and mechanical components increases
Solution Approach 1:
The weight support function is extracted from the pivoting points and transferred to the gas struts. The gas struts bear the majority of the bed base weight, while the pivoting points only handle guidance and minor adjustment forces, significantly reducing stress on the mechanical joints.
Solution Approach 2:
Gas struts are introduced as intermediary elements between the bed base and the mount assemblies. These struts act as force mediators, supporting the bed base weight and reducing the mechanical stress transmitted to the pivoting points and bearing plates.
4Reliability
If gas struts are used to support the bed base, then the reliability and stress reduction are improved, but the device complexity increases
Solution Approach 1:
The mount assemblies serve multiple functions: they provide rotation support, define the bed base position, and accommodate gas strut connections. The bearing plates simultaneously support the bed base and enable rotational movement, reducing the need for separate components.
Solution Approach 2:
Gas struts are used to provide pneumatic support for the bed base, replacing complex mechanical spring or hydraulic systems. The gas struts offer reliable, maintenance-free support with built-in shock absorption, improving reliability while adding minimal complexity.
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 design provides a reliable, easily assembled, and space-efficient sofa bed that can support a full-size bed with low stress on components, enhancing user safety and convenience by using gas struts for support and rotation between positions.
Implementation Method 1
gas struts for support and rotation between positions
Data Source
AI summary
A sofa bed assembly comprises a carcass having an inside, outside and interstitial interface. Mechanical moving parts comprise a bed base mount assembly and gas strut all outside the carcass and interface mounted. A base supports a mattress held by base sidewalls, vertical within and filling the carcass with the sofa bed closed. An armrest supports a sitter's arm in the closed assembly and as is a proximal bed support in the open assembly. Pivoted leg supports at the end of the bed base rotate as distal bed supports. Alternatively, a sofa is moved to the end of the bed base as distal bed support. An armrest extension extends the armrest for the closed assembly and folds through 90° for the open assembly allowing the armrest to act as the proximal bed support. Armrest shields cover mechanical moving parts.