Dynamic Triangular Support Folding Cart for Heavy Loads
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Solution Overview
Problem
Folding carts with traditional triangular support structures face issues of rod damage and fracture under heavy loads, and their operation is complicated and inconvenient.
Innovation Solution
A folding cart design featuring a supporting rod assembly with sliding upright rods forming a dynamic triangular support structure, enhanced by an intermediate upright rod, and a folding lock release mechanism to simplify folding and expansion motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional triangular support structures are used to enhance stability, then the supporting rods become more stable, but the operation becomes complicated and inconvenient
Solution Approach 1:
The supporting rod assembly is segmented into multiple components: fixed upright rods, sliding upright rods, and connecting rods. This segmentation allows the structure to maintain stability through its triangular configuration while enabling simplified folding operations by allowing individual segments to move independently relative to each other.
Solution Approach 2:
The patent introduces sliding upright rods that can dynamically adjust their position along the connecting rods. This dynamic capability allows the support structure to transition between stable configurations during use and compact configurations during folding, resolving the contradiction between stability and operational convenience.
2Force
If supporting rods are designed for heavy load bearing, then the load capacity increases, but the rods become prone to damage and fracture
Solution Approach 1:
The supporting rod assembly divides the load-bearing function across multiple rods rather than relying on a single rod. The fixed upright rods and sliding upright rods work together to distribute mechanical stresses, reducing the load on any individual rod and thereby improving overall reliability and resistance to fracture.
Solution Approach 2:
The patent combines fixed upright rods with sliding upright rods in a unified supporting rod assembly. This merging of static and dynamic elements creates a more robust structure that can better withstand heavy loads while maintaining reliability, as the combined assembly provides redundant support paths.
3Ease of operation
If the folding cart structure is simplified for easy folding, then the operation convenience improves, but the structural strength decreases
Solution Approach 1:
The sliding upright rods provide dynamic adjustment capability that allows the structure to be simple during folding (with rods sliding along connecting rods) while maintaining strength during use (with rods positioned to form stable triangles). This dynamic design resolves the contradiction between folding convenience and structural strength.
Solution Approach 2:
The patent utilizes the longitudinal dimension of the connecting rods by allowing sliding upright rods to move along their length. This dimensional approach enables the structure to achieve both compact folding (when rods are retracted) and strong support (when rods are extended and locked), without compromising structural integrity.
Data Source
AI summary
A folding cart comprises a foldable frame, which comprises an upper folding frame, a lower folding frame, and a supporting rod assembly arranged between the upper and lower folding frames. An intermediate upright rod is used as a core support body, and a front sliding upright rod and a rear sliding upright rod slide along a front lower rod and a rear lower rod to form a dynamic triangular support structure when unfolded, so that sliding ends of the front sliding upright rod and the rear sliding upright rod automatically slide into predetermined positions to form a stable mechanical support system when the cart is fully expanded. A sliding installation method is used to achieve linkage retraction of the supporting rod assembly during folding, which avoids multi-node operational complexity of traditional fixed triangular support structure, thereby significantly simplifying folding and expanding motions under the premise of high load-bearing capacity.