Chair Seat Support Frame With Curved Stop-Abutment Retention
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Solution Overview
Problem
Conventional folding chair designs suffer from loosening and fracturing of the stop abutment and horizontal support due to heavy loads and frequent posture changes, leading to instability and reduced lifespan, with inadequate welding techniques exacerbating the issue.
Innovation Solution
The design features a horizontal support with flattened and bent ends forming curved sections for secure welding to the front leg, and a vertical support piece with a stop abutment that firmly abuts the inner edge of the curved section, preventing movement and ensuring stability under heavy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the stop abutment is connected to the vertical support piece without a curved section, then the structure is simpler, but the stop abutment easily moves to the outer portion of the horizontal support and fractures under heavy load
Solution Approach 1:
The horizontal support is designed with a curved section instead of a straight configuration. This curved section creates a recessed area that receives and retains the stop abutment, preventing it from moving to the outer portion. The curvature provides a natural mechanical constraint that holds the stop abutment in place under heavy loads and frequent use, thereby improving reliability without significantly complicating the overall structure.
2Ease of manufacture
If the horizontal support ends are bent into a wavy shape, then the welding process becomes more difficult and quality decreases, but this was the conventional design approach
Solution Approach 1:
Instead of using a wavy shape with multiple crests and troughs that create difficult welding surfaces, the invention employs a single, smooth curved section. This simplified curvature maintains the necessary structural function while providing a more manageable geometry for welding operations, improving both manufacturing ease and welding quality.
3Ease of operation
If the stop abutment is allowed to move freely, then the chair can fold more smoothly, but the stop abutment fractures and the chair becomes unusable
Solution Approach 1:
The curved section creates a controlled environment for the stop abutment, allowing it to move within the recessed area during folding operations while preventing it from escaping to the outer portion where it would fracture. The curvature provides natural guides for movement that maintain both folding smoothness and frame integrity.
4Ease of manufacture
If the horizontal support is welded to the front leg without a curved section, then the welding process is simpler, but the welded portion is curved and difficult to weld with adequate quality
Solution Approach 1:
The curved section is designed to create a recessed area rather than a protruding curved surface. This recessed configuration allows the horizontal support to be welded to the front leg in a more straightforward manner, as the welding occurs on relatively flat surfaces within the recess, eliminating the difficulty of welding on external curved surfaces while maintaining the structural benefits of curvature.
Data Source
AI summary
An improved structure for a seat supporting frame of a chair includes a seat, front legs and back legs mounted on the two sides, a horizontal support having flattened ends and forming a bent section. The bent section is welded with the inner side of the front leg. The two ends of the bent corners are formed with a curved section. The sides of the seat has vertical support pieces, one end of which is set on the side of the seating frame, and the other end is connected to the front leg. A stop abutment, mounted on the lower section of the vertical support piece, is firmly abutted to the inner side of the curved section of the horizontal support, so as to prevent it from sliding and fracture. The horizontal support, the front leg, the vertical support piece, and the stop abutment are held together tightly.