Trolley Frame Support Bar for Cloth Bag Load Distribution
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Solution Overview
Problem
Existing foldable trolleys often damage or tear the cloth bag at the connection point due to excessive load, as they support the bag at a single point rather than distributing the weight linearly.
Innovation Solution
A trolley frame design featuring a support bar between two X-shaped linkage assemblies, with the top of the support bar hinged to a second horizontal bar, allowing the cloth bag to be supported by two horizontal bars instead of a single point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cloth bag is supported at a single connection point between X-shaped linkage mechanisms, then the frame structure remains simple and foldable, but the cloth bag is easily damaged or torn when carrying heavy loads
Solution Approach 1:
The single support point is segmented into multiple support points by introducing a support bar with two upward extensions. Each extension connects to a separate X-shaped linkage mechanism, distributing the load across multiple connection points rather than concentrating it at one location. This segmentation resolves the contradiction by maintaining structural simplicity while improving durability through load distribution.
Solution Approach 2:
The support bar introduces local structural enhancement at the bag support location without changing the overall frame design. By adding vertical extensions with connection points at different heights, the local quality of the support structure is improved to handle heavy loads, while the rest of the frame maintains its simple foldable configuration.
2Device complexity
If the middle part of the cloth bag is supported at one connection point, then the frame assembly is simple, but the stress concentration causes easy damage under excessive weight
Solution Approach 1:
The concentrated support force is segmented into multiple forces by creating two separate connection points on the support bar. This distributes the stress across different parts of the cloth bag and frame structure, preventing stress concentration and improving load bearing capacity while keeping the frame assembly relatively simple.
Solution Approach 2:
The support structure is extended into the vertical dimension by adding upward extensions to the support bar. This creates connection points at different heights, transforming a single-point support into a multi-level support system that enhances strength without significantly increasing horizontal complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively distributes the weight of the bag linearly, reducing the risk of damage or tearing when carrying heavy loads.
Implementation Method 1
four wheel carriers provided with roller wheels at lower ends
Implementation Method 2
a lower end of the support bar is hinged to the bottom folding stand
Data Source
AI summary
The disclosure relates to the technical field of trolleys, and in particular to a trolley frame, including four wheel carriers provided with roller wheels at lower ends and connected by a bottom folding stand. A side folding stand includes a support bar and at least two first X-shaped linkage assemblies. The support bar is arranged between the two first X-shaped linkage assemblies, and a lower end of the support bar is hinged to the bottom folding stand. A cloth bag can be well supported according to this solution, so as to reduce a risk of the cloth bag being damaged or torn in case of load bearing.