Sofa Bed Linking Mechanism to Reduce Assembly Complexity and Weight
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Solution Overview
Problem
Existing sofa beds have complex structures, high costs, and increased weight due to numerous hinge devices and bolts, requiring complicated assembly and packaging, which increases manufacturing and installation complexity.
Innovation Solution
A simplified sofa bed design featuring a linking mechanism with fewer components, where arm frames are pre-connected to the linking mechanism, reducing the need for bolts and assembly steps, and utilizing rotating hinges for pivoting the mattress and back frames, thereby reducing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hinge devices are used to connect mattress frame and back frame to arm frames, then the sofa bed achieves stable connection, but the structure becomes complicated, cost increases, and weight increases
Solution Approach 1:
The patent merges the base, front support plate, rear support plate, and bridge connecting piece into a single integrated linking mechanism. This combining of multiple separate components into one unified structure reduces assembly complexity while maintaining the stable connection function, directly resolving the contradiction between connection reliability and structural complexity
Solution Approach 2:
The linking mechanism serves multiple functions simultaneously: it connects the arm frame to both the mattress frame and back frame, provides rotational movement capability, and maintains structural stability. This multi-functionality eliminates the need for separate hinge devices, reducing overall device complexity while preserving connection reliability
2Reliability
If traditional hinge devices with multiple bolts are used, then secure locking is achieved, but the bolt quantity increases, cost increases, and assembly becomes cumbersome
Solution Approach 1:
Multiple bolted connections are merged into a single linking mechanism assembly that can be installed as one unit. The integrated design reduces the number of separate bolted joints from multiple individual connections to a streamlined assembly process, maintaining locking security while dramatically improving assembly ease
Solution Approach 2:
The linking mechanism is pre-assembled and pre-configured with all necessary connection elements before installation. This preliminary preparation ensures that during final assembly, the locking security is achieved through a simplified process where the pre-configured mechanism is simply attached, eliminating the need for multiple separate bolting operations
3Adaptability or versatility
If hinge devices are packed individually before leaving the factory, then the sofa bed can be disassembled for transport, but the packaging space increases and assembly steps increase
Solution Approach 1:
Multiple separate hinge device components are merged into a single compact linking mechanism that can be integrated directly onto the arm frame. This consolidation reduces the packaging volume required from multiple individual hinge packages to one integrated unit, while the mechanism retains its disassembly capability for transport purposes
Solution Approach 2:
The linking mechanism is designed with a compact, nested structure where components are arranged in a space-efficient configuration. This nesting allows the mechanism to occupy minimal packaging volume while still containing all necessary elements for disassembly and reassembly, resolving the contradiction between adaptability and packaging volume
4Reliability
If numerous hinge devices and bolts are used, then the sofa bed achieves stable structure, but the weight of the sofa bed increases
Solution Approach 1:
Multiple separate metal components (base, support plates, bridge pieces, and bolts) are merged into a single linking mechanism structure. This consolidation reduces the total amount of material required while maintaining structural stability through the integrated design, thereby reducing the overall weight of the sofa bed
Solution Approach 2:
The linking mechanism utilizes optimized material composition and structure, potentially incorporating lightweight alloys or composite materials that maintain structural stability with reduced weight compared to traditional heavy-duty hinge devices and multiple bolt assemblies
Data Source
AI summary
A sofa bed includes a mattress frame, a back frame, two arm frames and two cross beams, two arm frames are connected by the two cross beams, wherein the mattress frame and the back frame are rotatably pivoted. The inner side of the arm frame is disposed with a linking mechanism. The linking mechanism has a front connecting piece, rear connecting piece and a bridge connecting piece. Two ends of the bridge connecting piece are respectively pivoted to the front connecting piece and the rear connecting piece. The bottom end of the front connecting piece is pivoted to the arm frame. The bottom end of the rear connecting piece is pivoted to the arm frame. The linking mechanism has a front connecting piece, rear connecting piece and a bridge connecting piece.