Foldable Cart With Pivoting Wheel Assemblies
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Solution Overview
Problem
Conventional small wagons or carts are difficult to store in compact spaces due to their inability to fold, making them unsuitable for storage in car trunks or other limited areas.
Innovation Solution
A foldable cart design featuring a front panel hinged to a rear panel with slide rails and wheel assemblies that can pivot between open and folded positions, allowing the cart to be easily converted between a pulling cart and a compact storage configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cart is designed as a fixed non-foldable structure, then it maintains structural stability and ease of operation, but it occupies excessive storage space and cannot be stored in compact areas
Solution Approach 1:
The cart is divided into separable components: the cart body, the handle assembly, and the wheel assemblies. Each component can be independently folded or detached, allowing the cart to be reduced to a compact configuration for storage while maintaining full functionality when deployed.
Solution Approach 2:
The cart incorporates dynamic elements including a telescopic handle that can extend and retract, and wheel assemblies that can pivot between a deployed position for pulling and a folded position for storage. This dynamic design allows the cart to adapt between two states: fully functional and compact storage.
2Adaptability or versatility
If the cart is made foldable to reduce storage space, then it can be stored in compact areas, but the folding mechanism increases device complexity
Solution Approach 1:
The handle assembly serves multiple functions: it acts as a pulling handle when extended, and as a carrying handle when the cart is folded. The wheel assemblies also serve dual purposes: providing wheel support in the open configuration and enabling compact folding in the storage configuration. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The wheel assemblies are designed to nest within or alongside the cart body when folded, and the handle can be retracted into the cart structure. This nesting arrangement allows the cart to achieve a compact configuration without requiring separate storage containers or additional folding components.
3Ease of operation
If the handle is made telescopic to adjust length, then it can be optimized for both pulling and storage, but it increases device complexity
Solution Approach 1:
The telescopic handle is designed to be self-adjusting through a simple locking mechanism that allows the user to extend or retract the handle by pushing against a latch or button. This self-service design eliminates the need for complex motorized or mechanically assisted extension systems, maintaining ease of operation while minimizing complexity.
Data Source
AI summary
A pulling cart with four wheels can be folded into a folded configuration. The wheels are mounted on wheel assemblies which can be in an open or a folded position. The cart has a front panel hinged to a rear panel. The front panel has a front carrier for mounting two wheel assemblies and a pair of slide rails extendable to the second panel. A rear carrier having two wheel assemblies is fixedly mounted to the end portion of the slide rails to move between the front and rear panels. When the cart is used for pulling, all wheel assemblies are in the open position. Each carrier has two arm-receiving holes. Each wheel assembly has a pair of arcuate arms which can rest on the carrier to support the wheel in the open position or move through the arm-receiving hole into the folded position for folding the cart.