Three-Section Sofa Bed Linkage Mechanism for One-Step Unfolding
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Solution Overview
Problem
Current sofa beds are time-consuming, strenuous, and inconvenient to convert between sofa and bed modes, often lacking a stable locking structure, leading to instability during unfolding.
Innovation Solution
A linkage mechanism for a three-section sofa bed comprising a first, second, and third link assembly, with a locking assembly that allows for one-step unfolding or folding through linkage rotation, featuring a locking rod to secure the mechanism and prevent unwanted rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional connection mechanisms are used for sofa bed conversion, then the sofa bed can be converted between sofa and bed modes, but the conversion process becomes time-consuming and strenuous
Solution Approach 1:
The sofa bed is divided into three independent sections (front sofa cushion, middle sofa cushion, rear sofa cushion) that can be converted independently through separate link assemblies. Each link assembly handles one cushion's movement, allowing parallel operation and reducing overall conversion time and effort.
Solution Approach 2:
The patent combines multiple link assemblies (first, second, and third link assemblies) into a unified conversion system where all three cushions are converted simultaneously through coordinated rotation. This merging of conversion functions into a single operational sequence eliminates the need for separate manual adjustments of each cushion.
2Ease of operation
If conventional connection mechanisms are used for sofa bed conversion, then the sofa bed can be converted between modes, but the process becomes inconvenient
Solution Approach 1:
The conversion mechanism is segmented into three independent link assemblies, each responsible for one cushion. This segmentation simplifies the design of each individual mechanism while maintaining overall system functionality, making each link assembly easier to manufacture and maintain.
Solution Approach 2:
The patent employs dynamic link assemblies that rotate to different angles depending on whether the sofa bed is in sofa mode or bed mode. The link assemblies can dynamically adjust their configuration, providing smooth transitions between modes without requiring complex locking or positioning mechanisms.
3Stability of the object's composition
If no locking structure is provided for sofa bed conversion, then the mechanism remains simple, but the sofa bed becomes unstable when unfolded
Solution Approach 1:
The locking assembly operates automatically through the rotation of the link assemblies. When the link assembly rotates to the bed mode position, the locking rod automatically engages with the locking hole to secure the cushion in place. This self-locking mechanism eliminates the need for separate manual locking operations.
Solution Approach 2:
The locking rod acts as an intermediary element between the link assembly and the cushion frame. It provides the locking function by engaging with the locking hole, ensuring stability without requiring complex mechanical fasteners or multiple locking points.
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
Enables easy operation, reduces packaging space, lowers logistics costs, and enhances product safety by stabilizing the sofa bed during use and storage.
Implementation Method 1
the front sofa cushion is folded and stored inside the sofa frame or unfolded at one side of a middle sofa cushion through the linkage rotation of the first link assembly
Implementation Method 2
the first link assembly drives the second link assembly to rotate, thereby allowing the middle sofa cushion to be folded and stored inside the sofa frame or unfolded at one side of a rear sofa cushion
Implementation Method 3
the first link assembly drives the third link assembly to rotate, thereby allowing the rear sofa cushion to rise and fall
Implementation Method 4
an insertion end of a locking rod of a locking assembly is inserted into the locking hole to prevent the first link assembly from rotating again
Data Source
AI summary
A linkage mechanism for a three-section sofa bed is provided. The linkage mechanism includes a first link assembly, a second link assembly, a third link assembly, and a locking assembly, where the first link assembly includes one side pivoted to a front sofa cushion and the other side pivoted to a fixed base frame of a sofa frame; the first link assembly is provided with a locking hole; the second link assembly includes one end pivoted to a middle sofa cushion and the other end pivoted to a middle segment of the first link assembly; the third link assembly includes one side pivoted to a rear sofa cushion and the other side pivoted to a pivot position of the first link assembly pivoted to the fixed base frame; the locking assembly is located at a side of the first link assembly close to the front sofa cushion.