System for convertible bunk beds
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Solution Overview
Problem
Existing systems for converting bunk beds into sofas are either complex, require separate mattresses and seats, lack robustness, or do not integrate the ladder, making them difficult to use and access.
Innovation Solution
A system utilizing a double four-bar linkage mechanism that allows the upper frame to move vertically without rotating, integrating a ladder that automatically retracts and extends, and includes a safety locking system to prevent accidental closure, ensuring ease of use and aesthetic freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a four-bar linkage is used to move the upper bed while keeping it horizontal, then the bed remains stable during conversion, but the system lacks robustness and requires separate ladder storage
Solution Approach 1:
The patent merges the ladder with the upper bed frame by integrating it into the four-bar linkage structure. The ladder becomes an integral part of the moving assembly, eliminating the need for separate storage and improving system robustness while maintaining horizontal stability during conversion.
Solution Approach 2:
The patent employs a dynamic four-bar linkage mechanism that automatically adjusts the ladder's position during conversion. The linkage ensures the ladder moves with the upper bed frame, providing continuous support and maintaining stability throughout the transformation from bed to sofa configuration.
2Adaptability or versatility
If the frame rotates by 180° during conversion, then the bed transforms into a sofa, but separate mattress and sofa-seat components are required increasing complexity
Solution Approach 1:
The patent combines the mattress and sofa-seat into a single integrated unit that moves with the upper bed frame. This unified design eliminates the need for separate components and binding operations, reducing complexity while maintaining full convertibility between bed and sofa configurations.
Solution Approach 2:
The upper bed frame assembly serves multiple functions: it acts as both a bed support structure and a sofa-back structure. The integrated design allows the same components to fulfill different roles depending on the configuration, eliminating the need for separate mattress and sofa-seat elements.
3Ease of operation
If the ladder is kept separately for easy access, then access to upper bed is simplified, but the system becomes less robust and requires additional storage steps
Solution Approach 1:
The ladder is merged with the upper bed frame through the four-bar linkage mechanism, creating a single robust assembly. This integration maintains structural reliability while the linkage ensures the ladder moves with the frame, providing automatic access during conversion without requiring separate storage.
Solution Approach 2:
The dynamic four-bar linkage mechanism automatically positions the ladder during conversion, ensuring it moves with the upper bed frame. This provides continuous access functionality while maintaining structural integrity, eliminating the trade-off between separate storage and robustness.
Data Source
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AI summary
System for convertible bunk beds comprising a base frame (11); an upper frame (21) of such dimensions that it can house a first mattress (211), movable between a first position in which the same is lowered and the system is in sofa configuration and a second position, substantially on the vertical of said first position, in which said upper frame (21) is lifted and the system is in bunk bed configuration; a third frame (25) of such dimensions that it can house a second mattress (251), constrained so that it is comprised between said base frame (11) and said upper frame (21), characterized in that the constraint of said upper frame (21) to said base frame (11) occurs by means of a kinematics with double four-bar linkage which allows to move said upper frame (21) while keeping it constantly in horizontal position.