Expandable Cart Scissor Linkage for Compact Folding Storage
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Solution Overview
Problem
Existing foldable carts are too large after being folded and have a limited volume, making them inconvenient for storage and carrying.
Innovation Solution
An expandable cart design featuring a lifting mechanism with telescopic columns and folding mechanisms that allow the cart to increase in volume by extending and reduce volume by folding, utilizing scissor linkage assemblies and a bottom support mechanism for compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cart uses a flat plate structure with wheels mounted underneath, then the cart can be pushed easily and save time and effort, but the cart cannot be folded and takes up a lot of space when not in use
Solution Approach 1:
The cart structure is transformed from a static flat plate design to a dynamic scissor linkage mechanism that can change its configuration between extended and folded states. The scissor linkages allow the cart platform to expand and contract while maintaining structural integrity, enabling easy folding for storage while preserving the operational functionality when deployed
2Ease of operation
If the cart uses existing foldable mechanisms, then the cart can be folded, but the folded volume is still too large and limited
Solution Approach 1:
The scissor linkage arms are designed to nest within each other when folded, with each arm containing or overlapping with adjacent arms. This nesting arrangement significantly reduces the overall volume of the folded cart compared to traditional foldable mechanisms, allowing for compact storage while maintaining the folding capability
Solution Approach 2:
The folding mechanism utilizes three-dimensional spatial arrangement where the scissor linkages collapse in multiple directions simultaneously rather than simple linear folding. This multi-dimensional collapse approach minimizes the bounding box volume of the folded cart, achieving compact storage form factor
3Volume of moving object
If the cart increases its volume for use, then the cart can carry more items, but the cart becomes larger and harder to store when not in use
Solution Approach 1:
The cart employs dynamic scissor linkage mechanisms that allow the platform to expand to large volume for cargo carrying and then contract to small volume for storage. The mechanism provides smooth transition between expanded and contracted states, making the cart adaptable to different usage scenarios and storage requirements
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
The cart effectively increases volume for use while minimizing folded size, facilitating easy storage and carrying by allowing telescopic columns to contract and folding mechanisms to collapse, thus reducing overall dimensions.
Implementation Method 1
a lifting mechanism including a first telescopic column, a second telescopic column, a third telescopic column, and a fourth telescopic column which are arranged vertically and capable of telescoping
Implementation Method 2
the third folding mechanism and the fourth folding mechanism each include a first scissor linkage assembly, a second scissor linkage assembly, and a third scissor linkage assembly hinged in sequence
Data Source
AI summary
An expandable cart includes a lifting mechanism, and a first folding mechanism, a second folding mechanism, a third folding mechanism, and a fourth folding mechanism capable of being folded and contracted. The lifting mechanism includes a first telescopic column, a second telescopic column, a third telescopic column, and a fourth telescopic column arranged vertically and capable of telescoping. The first telescopic column, the second telescopic column, the third telescopic column, and the fourth telescopic column are rectangularly arranged at intervals, and the first folding mechanism, the second folding mechanism, the third folding mechanism, and the fourth folding mechanism are sequentially connected between two adjacent telescopic columns. The four telescopic columns are contracted to a shortest state and close to each other, thereby effectively reducing the folding volume of the expandable cart, and facilitating storage and carrying by a user.