Foldable Cart Frame With Sliding Side Assemblies
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Solution Overview
Problem
Existing foldable carts increase in height when folded, making them difficult to store and maintain a large overall size due to fixed frame structures that limit width adjustment.
Innovation Solution
A foldable cart design featuring a rectangular frame with sliding components, X-shaped support assemblies, and an adjustable handle assembly, allowing all sides to be folded for reduced size, enhanced support strength, and convenient use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cart is designed with a fixed frame structure, then the frame provides stable support, but the overall width cannot be changed when folded, resulting in a large folded size
Solution Approach 1:
The frame is divided into multiple independent components including front wall, back wall, side walls, and bottom frame, each capable of relative movement. The side walls can be folded relative to the front and back walls, and the bottom frame can be folded relative to the side walls, enabling progressive size reduction while maintaining structural stability during each folding stage.
Solution Approach 2:
The frame transitions from a static fixed structure to a dynamic multi-stage folding structure. The cart can be folded in stages: first the side walls fold relative to the front and back walls, then the bottom frame folds relative to the side walls, allowing the structure to adapt its configuration and minimize volume while preserving support strength.
2Length of moving object
If the middle support frame is folded to reduce cart length, then the cart becomes more compact in length, but the height increases making storage difficult
Solution Approach 1:
Instead of folding only in the horizontal plane which increases height, the invention introduces vertical folding dimensions. The side walls fold downward relative to the front and back walls, and the bottom frame folds upward relative to the side walls, utilizing vertical space efficiently to reduce overall length without significantly increasing height, enabling compact storage.
3Volume of moving object
If the cart is designed to fold completely, then the folded size is minimized, but the structural strength may be compromised
Solution Approach 1:
The folding structure is segmented into multiple rigid components connected by folding joints. Each component (front wall, back wall, side walls, bottom frame) maintains its structural integrity independently, and the folding joints are designed to bear loads during both folded and unfolded states, ensuring strength is preserved throughout the folding range.
Solution Approach 2:
The structure dynamically adjusts its configuration while maintaining strength through controlled folding mechanisms. The folding joints and connection structures are designed to provide necessary support strength in both the unfolded carrying state and the folded storage state, allowing the cart to transition between configurations without compromising structural integrity.
Data Source
AI summary
A foldable cart having a rectangular frame composed of a front wall and a back wall which are symmetric with each other, two symmetric side walls, and a bottom frame. Four wheels are disposed at four corners of a bottom surface of the rectangular frame. The front wall has two sliding seats, two vertical tubes, a folding assembly, two upper fixing seats and two lower fixing seats. Each side wall has two X-shaped side assemblies, a middle support tube, and a sliding sleeve slidably disposed around the middle support tube, wherein middle fixing seats are disposed at an upper end and a lower end of the middle support tube respectively, and each X-shaped side assembly is formed by two side cross tubes which are riveted together.