Convertible Seating Unit Linkage for Seamless Bed Folding
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Solution Overview
Problem
Existing convertible furniture units that function as beds often require intricate mechanisms and separate mattresses, making them heavy and complex, while lacking a complete mattress, other units have separate sections that do not provide a seamless sleeping surface.
Innovation Solution
A seating unit with a foldable bed mechanism comprising pivotally interconnected links that control the movement of sections between a folded and unfolded position, allowing for a seamless sleeping surface without the need for a separate mattress, and an optional backrest raising mechanism for increased versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete mattress is included in the sofa-bed design, then the sleeping comfort is improved, but the weight and device complexity increase
Solution Approach 1:
The patent extracts the mattress function from a separate complete mattress unit and integrates it into the sofa structure itself. The seating unit includes integrated mattress sections that form part of the sofa framework, eliminating the need for a separate mattress while maintaining sleeping comfort.
Solution Approach 2:
The patent merges the mattress functionality with the sofa structure by incorporating mattress sections directly into the seating unit. The mattress sections are integrated with the armrests and frame, combining what were previously separate components (sofa frame and mattress) into a unified structure.
2Reliability
If a separate mattress is included, then sleeping comfort is improved, but the overall weight of the unit increases
Solution Approach 1:
The patent combines the mattress structure with the sofa frame into a single integrated unit. The mattress sections are structurally integrated with the armrests and frame, eliminating the need for a separate mattress component and thereby reducing overall weight while maintaining sleeping comfort.
3Device complexity
If separate sections are used to form the sleeping surface, then the device complexity is reduced, but the sleeping surface is not seamless
Solution Approach 1:
The patent merges multiple mattress sections into a unified continuous sleeping surface. The mattress sections are integrated with each other and with the frame, creating a seamless surface that eliminates gaps or discontinuities between separate sections while maintaining structural simplicity.
4Volume of moving object
If the head and intermediate sections are positioned in the cavity, then the folded compactness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements a nested configuration where the head and intermediate mattress sections are positioned within the cavity formed by the armrests and frame when the unit is in the seating position. This nesting arrangement achieves compact folded volume while the integrated structure provides inherent alignment guidance that reduces manufacturing precision requirements.
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 lightweight, multifunctional seating unit that converts into a bed with a seamless sleeping surface, eliminating the need for a separate mattress and offering enhanced versatility with a backrest that can be raised to accommodate a longer sleeping surface.
Implementation Method 1
a mechanism having pivotally interconnected links, the mechanism interconnecting the base with the head, intermediate and seat sections
Implementation Method 2
the seat section having a pitch angle and resting on the front and rear walls of the housing
Data Source
AI summary
A seating unit containing a foldable bed includes: a seating unit frame having a pair of opposed arms; a housing including a storage cavity, the housing fixed to the arms of the seating unit frame; a seat section; an intermediate section; a head section; and a mechanism having pivotally interconnected links, the mechanism interconnecting the base with the head, intermediate and seat sections. The mechanism controls the movement of the head, intermediate and seat sections between a folded position, in which the head, intermediate and seat sections are positioned in vertically stacked relationship, with the head section below the intermediate section and the seat section above the intermediate section, the head and intermediate sections being positioned in the cavity of the housing, and the head and intermediate sections being generally horizontally disposed and the seat section having a pitch angle of between about 1 and 7 degrees to horizontal, and an unfolded position, in which the head, intermediate and seat sections are horizontally disposed and serially aligned to form a sleeping surface.