Sofa Bed Fixing Sheet Design for Frequent Folding Stability
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Solution Overview
Problem
Conventional folding sofa beds often come undone when frequently accessing the storage chest underneath, presenting an unsightly appearance due to lack of stability during frequent use transitions.
Innovation Solution
Incorporating a flexible fixing sheet between the mattress and bedstead, fixed centrally with recesses in the perimeter to maintain rigidity and allow sheet tucking, along with removable backrest supports for flexible placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bedstead is frequently folded to access the storage chest, then accessibility to storage is improved, but the bed structure stability deteriorates causing the bed to come undone
Solution Approach 1:
The bedstead is divided into multiple foldable sections that can be independently manipulated. The fixing sheet is segmented with a fixed central area and free peripheral areas, allowing different parts to serve different functions - the central area maintains structural integrity while the periphery allows folding access to the chest.
Solution Approach 2:
The fixing sheet is pre-attached to the bedstead in a central area before use, creating a permanent anchor point. This preliminary fixation ensures that when the bedstead is folded for chest access, the mattress remains secured and the bed structure maintains its integrity throughout the folding operation.
2Stability of the object's composition
If the fixing sheet is made completely rigid for stability, then bed structure stability is improved, but flexibility in sheet tucking deteriorates
Solution Approach 1:
The fixing sheet exhibits different properties in different areas: the central area is rigidly fixed to provide structural stability, while the peripheral areas remain free and flexible to allow sheet tucking and bedstead folding. This local differentiation of properties resolves the contradiction between overall stability and local flexibility.
Data Source
Figure 1~2
Figure 3
AI summary
The present invention describes a sofa bed comprising a mattress (1), a rigid bedstead (3) intended to be the base of the mattress (1), backrest supports (5) and a frame that forms a chest (4), the bedstead being attached to the frame by means of a folding system, wherein the sofa bed comprises a fixing sheet (2) located between the mattress (1) and the bedstead (3), of similar dimensions to the bedstead (3) and fixed to the bedstead (3) on a central area, leaving the perimeter area free to be able to tuck in the sheets, so that a frequent folding of the bedstead (3) does not undo the bed.