Foldable Cart With Auto-Deploying Wheels
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Solution Overview
Problem
Conventional shopping carts are bulky, difficult to maneuver, and not suitable for personal use due to their size and weight, and existing portable foldable carts require assembly and have wheels that do not collapse, occupying extra space when folded.
Innovation Solution
A portable cart with automatically deploying wheels that fold into a compact position, allowing for easy storage and transportation without assembly, featuring a foldable frame that supports heavy loads and occupies minimal space when folded, using a mechanism like a cam-lever to convert linear to rotational motion for wheel deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional shopping carts are made large and bulky to carry heavy loads, then load capacity is improved, but portability and ease of storage deteriorate
Solution Approach 1:
The cart employs a dynamic folding mechanism that transforms the rigid frame into a compact configuration. The foldable frame with movable joints allows the cart to transition between an expanded load-bearing state and a collapsed portable state, resolving the contradiction between strength and portability.
Solution Approach 2:
The folding design allows the cart components to nest within each other when collapsed, with the basket folding inward and the frame segments overlapping, creating a compact package that maintains structural integrity while minimizing storage space.
2Ease of operation
If portable foldable carts are made compact for storage, then portability is improved, but wheel space occupation and stability deteriorate
Solution Approach 1:
The wheels are designed with a dynamic deployment mechanism that keeps them compact during storage and automatically extends them when the cart is in use. This allows the cart to maintain a small folded volume while providing full wheel functionality during operation.
Solution Approach 2:
The wheel deployment is triggered automatically when the cart frame is unfolded, preparing the wheels for use before the cart begins carrying loads. This preliminary action ensures wheels are in the correct position without requiring separate manual assembly.
3Ease of manufacture
If portable foldable carts require assembly by end-users, then manufacturing flexibility is improved, but ease of use and time consumption deteriorate
Solution Approach 1:
The cart is pre-assembled at the factory with all components including wheels, basket, and frame connections already in place. This preliminary assembly eliminates the need for end-users to perform complex assembly tasks, while the folding mechanism maintains portability benefits.
Solution Approach 2:
The cart is designed as modular segments that can be easily manufactured separately and then quickly connected through simple attachment mechanisms, allowing manufacturing flexibility while enabling rapid user setup.
4Reliability
If conventional shopping carts are made heavy for durability, then strength and reliability are improved, but ease of maneuvering and portability deteriorate
Solution Approach 1:
The cart utilizes lightweight materials such as aluminum or high-strength plastics that maintain durability while significantly reducing weight. The structural parameters are optimized to provide necessary strength without excessive mass, improving both portability and reliability.
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
Enables convenient and affordable shopping with minimal assembly required, allowing the cart to be easily stored in small spaces and transported, while providing a strong and rigid structure to support heavy loads, with wheels that deploy automatically for use and collapse for storage.
Implementation Method 1
using a mechanism like a cam-lever to convert linear to rotational motion for wheel deployment
Data Source
AI summary
A foldable cart includes a handle portion, a foldable frame movably connected to the handle, and one or more wheels for rolling on a surface. In an unfolded (in-use or open) condition, the foldable frame constructs a holding-space defining a receiving cavity therein for carrying items, and the action of unfolding the frame automatically deploys wheels to enable immediate use of the cart by the end-user or customer. In a folded (storage or closed) condition, the carts' frame folds to occupy a smaller space in one or more spatial dimensions, and the automatically deployed wheels turn to occupy smaller total space in one or more spatial dimensions. In the folded condition, the cart is easy to store in a small space (e.g. in a small closet, under a bed, etc.) or transport (e.g. in the trunk of an automobile, vehicle, airplane, train, ship with a courier, etc.).