Folding seat support frame
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Solution Overview
Problem
Existing folding chairs have a large seat area and folding size, requiring significant storage space and compromising use stability.
Innovation Solution
A folding seat support frame design featuring an upper and lower support frame with rotatable connecting rods and a central shaft system, allowing the upper connecting rods and short rods to rotate downward for compact storage while maintaining seat area expansion without increasing folding size, and incorporating a sleeve and rotating connector for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If multiple sets of connecting rods are used to increase seat area, then the seat area is improved, but the folding size increases and storage space requirement increases
Solution Approach 1:
The patent applies nesting by placing the upper connecting rods inside the lower connecting rods during folded state. The upper connecting rods are received within the hollow structure of the lower connecting rods, creating a compact nested configuration that minimizes folding size while maintaining the capability for a large seat area when deployed
Solution Approach 2:
The patent utilizes vertical stacking arrangement where upper connecting rods are positioned above lower connecting rods in the unfolded state, allowing the structure to expand vertically to create seat area without significantly increasing horizontal footprint. During folding, this vertical arrangement enables compact nesting by bringing components together in the vertical dimension
2Area of moving object
If multiple sets of connecting rods are used to increase seat area, then the seat area is improved, but the use stability deteriorates
Solution Approach 1:
The patent divides the support structure into separate upper and lower connecting rod assemblies, each with independent connectors and rod elements. This segmentation allows each component to be optimized for its specific function while working together to provide overall structural stability and support for an expanded seat area
Solution Approach 2:
The patent combines the upper and lower connecting rod assemblies into a unified integrated structure where both sets of rods work together to provide support. The merging of these components creates a more stable overall structure compared to using a single set of connecting rods, as the distributed framework provides multiple load paths and enhanced rigidity
3Volume of moving object
If the upper connecting rods and short rods are rotated downward for compact storage, then the folding size is reduced, but the structural complexity increases
Solution Approach 1:
The patent employs dynamic rotational joints that allow the upper connecting rods and short rods to rotate downward for compact storage. These joints enable the structure to transition between deployed and folded configurations, providing adaptability while maintaining relatively simple connection mechanisms that reduce overall structural complexity
Data Source
AI summary
A folding seat support frame includes an upper support frame detachably connected to a seat fabric and a lower support frame connected to the upper support frame, where the upper support frame includes an upper connector, short rods rotationally connected to the upper connector at a first limited angle, and upper connecting rods rotationally connected to the short rods at a second limited angle; the lower support frame includes a lower connector and lower connecting rods rotationally connected to the lower connector at a third limited angle; the lower connector and the upper connector are coaxially and rotationally connected; when the folding seat support frame is in an unfolded state, the lower connecting rods and the short rods are oriented to a side of the lower connector; when the folding seat support frame is in a folded state, the short rods are butted against the lower connector.