Chair Plug Connection Structure to Simplify Backrest Assembly
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Solution Overview
Problem
The existing methods for assembling chairs, which involve welding or using fasteners to attach the backrest to the side frames, are complicated and aesthetically unpleasing due to exposed seams or fasteners.
Innovation Solution
A plug structure is used where grooves on the rear supporting legs of the chair's side frames receive fasteners from the backrest portion, eliminating the need for welding or visible fasteners, allowing for simple assembly and a cleaner appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding or fasteners are used to fix the backrest portion to the side frames, then the connection strength is improved, but the assembling operations become complicated and the appearance is adversely affected
Solution Approach 1:
The connection structure is segmented into a plug portion integrated with the backrest and groove portions integrated with the side frames. This segmentation allows the backrest to be divided into modular units that can be independently assembled into the grooves, simplifying the overall assembly process while maintaining connection strength through the distributed plug-groove interfaces.
Solution Approach 2:
The plug portion is inserted into the groove portion, creating a nested connection where one component fits within another. This nesting mechanism eliminates the need for external fasteners or welding, as the plug-groove interface provides both structural connection and positioning, thereby simplifying assembly operations while preserving appearance by hiding the connection mechanism.
2Strength
If welding or fasteners are used to fix the backrest portion to the side frames, then the connection strength is improved, but the appearance is adversely affected due to exposed seams or fasteners
Solution Approach 1:
The connection mechanism (plug and groove structures) is extracted and integrated into the components themselves rather than being applied as separate fasteners or welds. The plug portion is built into the backrest and the groove portions are built into the side frames, allowing the connection to be made without external visible elements, thus preserving appearance while maintaining strength.
Solution Approach 2:
The nested plug-groove connection hides the joining mechanism within the components. The plug inserts into the groove and the connection is concealed within the structure rather than being exposed on the surface, eliminating visible seams or fasteners from the chair's appearance while providing sufficient connection strength.
3Device complexity
If a plug structure is used to connect the backrest portion to the rear supporting legs, then the assembling operations are simplified and appearance is improved, but the connection mechanism must be hidden from the rear view
Solution Approach 1:
The grooves are positioned specifically on the front surfaces of the rear supporting legs, creating a localized feature that serves the dual purpose of enabling plug insertion for simplified assembly while remaining invisible from the rear view. This local placement of the groove openings allows the connection mechanism to function without compromising the aesthetic appearance when viewed from behind.
Data Source
AI summary
A chair comprises: two side frames, each of the two side frames comprising a front supporting leg and a rear supporting leg; a seat portion fixed between the two side frames; and a backrest portion connected to the rear supporting legs of the two side frames via a plug structure.