Sofa Reclining Backrest with Nested Retractable Headrest Mechanism
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Solution Overview
Problem
Conventional lounge furniture often lacks a headrest component, compromising user comfort and requiring users to adopt uncomfortable positions to utilize available head support, especially in deep sofas which can lead to discomfort or back pain.
Innovation Solution
A sofa design featuring a reclining backrest with a retractable headrest mechanism, where the headrest is hidden within the backrest and can be deployed by folding the backrest, utilizing a metallic mechanism with articulations and recesses for ergonomic access without bending, combining aesthetics with enhanced comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a headrest is added to conventional lounge furniture, then user comfort is improved, but the sofa's appearance and dimensions are altered
Solution Approach 1:
The headrest is nested within the backrest structure, allowing it to be stored inside the backrest when not in use and deployed when needed. This nesting approach allows the headrest to be added to the sofa without permanently altering its appearance or increasing its dimensions, as it remains concealed within the existing structure.
Solution Approach 2:
The headrest is designed as a dynamic, movable component that can be deployed and retracted. It articulates through hinges and is movable along guide rails, allowing it to transition between a concealed state (maintaining aesthetic appearance) and an deployed state (providing user comfort). This dynamic design resolves the contradiction by making the headrest appear only when needed.
2Ease of operation
If a fixed headrest is installed on the sofa, then head support is provided, but the sofa loses aesthetic appeal and increased dimensions
Solution Approach 1:
The headrest is nested within the backrest, utilizing the existing internal space of the sofa structure. This eliminates the need to increase the sofa's external dimensions, as the headrest is housed within the already-present backrest volume rather than adding to it.
Solution Approach 2:
The headrest is designed as a movable, deployable component rather than a fixed structure. It can be articulated into position only when needed for head support, and retracted when not in use. This dynamic approach provides head support functionality without requiring permanent dimensional increases to the sofa.
3Ease of operation
If the headrest is always visible, then it is easily accessible, but the sofa cannot maintain traditional aesthetics
Solution Approach 1:
The headrest is designed as a dynamic component that can be deployed and retracted. When deployed, it is easily accessible to users; when retracted, it is concealed within the backrest. This dynamic behavior allows the sofa to maintain traditional aesthetics when the headrest is not needed, while still providing easy accessibility when deployed.
Solution Approach 2:
The headrest is positioned and secured in advance within the backrest structure, ready for deployment. The articulation mechanisms and guide rails are pre-installed, allowing the headrest to be quickly and easily deployed when needed without requiring complex assembly or adjustment at the moment of use.
Data Source
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AI summary
Sofa with reclining backrest comprising a structure formed by a rear structure (4) and a seat structure (5), in addition to the reclining backrest (2) itself and a seat (3), which comprises a headrest (1) attached to the backrest (2), and a mechanism formed by bases (8), which attach to the rear structure (4), from which two extensions (9) protrude, a backrest structure (11) formed by first bars (12) located in the side ends of the backrest (2) and attached by means of extension bars (13) which give the backrest (2) the rigidity required, a headrest structure (14) which gives the headrest (1) rigidity, where the ends of the first bars (12) end in two articulations (10) by means of which the first ends attach to the corresponding extensions (9) of the base (8) and the second ends attach to the headrest structure (14), so that the backrest (2) can be folded with respect to the rear structure (4) and the headrest (1) can be folded with respect to the backrest (2).