Door Conversion Kit With Interchangeable Wheel Assemblies
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Solution Overview
Problem
Existing carts lack versatility and compactness to navigate diverse terrains such as roads, railroad tracks, snow, and ice, and are not easily storable when not in use, making them inadequate for emergency evacuation scenarios where access to fuel and infrastructure is limited.
Innovation Solution
A kit that converts a door into a cart by attaching wheel assemblies, including a fender with a planar expanse and clamping members, allowing the door to be equipped with bicycle, wheelbarrow, or railroad wheels, and a handle for easy movement, while being storable in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cart is designed to accommodate diverse terrains (roads, railroad tracks, snow, ice), then the cart's versatility is improved, but the cart's complexity and stowability deteriorate
Solution Approach 1:
The wheel attachment assembly is designed with multiple wheel types (bicycle wheel, wheelbarrow wheel, railroad wheel) that can be interchangeably mounted on the same assembly structure. This allows a single cart design to function across diverse terrains including roads, railroad tracks, snow, and ice without requiring multiple specialized cart designs.
Solution Approach 2:
The cart system is divided into separable components: the door platform, the wheel attachment assemblies, and the wheels themselves. This segmentation allows the wheel assemblies to be independently configured for different terrains and enables compact stowability when wheels are detached or folded, resolving the contradiction between versatility and complexity.
2Volume of moving object
If a cart is designed to be compact and easily stowable, then the cart's stowability is improved, but the cart's versatility to accommodate various wheel types deteriorates
Solution Approach 1:
The wheel attachment assembly is designed as a separable unit that can be detached from the door platform. This allows the cart to be stowed in a compact form by removing the wheel assemblies, while still maintaining the capability to accommodate various wheel types when needed through simple reattachment.
Solution Approach 2:
The wheel attachment assembly incorporates dynamic mounting mechanisms that allow for quick attachment and detachment of different wheel types. This dynamic design enables the cart to transition between a compact stowed state and a fully configured operational state with various wheel types as needed.
3Reliability
If wheel attachment assemblies are designed with multiple attachment points and complex structures, then the reliability of wheel attachment is improved, but the ease of assembly deteriorates
Solution Approach 1:
The wheel attachment assembly uses standardized attachment mechanisms that can securely accommodate multiple wheel types (bicycle, wheelbarrow, railroad wheels) through a single design. This universal attachment system maintains reliability across different wheel types while simplifying the assembly process by eliminating the need for multiple specialized attachment mechanisms.
Data Source
AI summary
A cart may include a door forming a bed of the cart and a pair of wheel attachment assemblies. Each wheel attachment assembly may include (a) a fender having a planar expanse configured to abut a lower major face of the door, (b) a clamping member coupled to the fender, the clamping member configured to be coupled to an upper major face of the door and abut an edge face of the door, and (c) a wheel fork coupled to the fender and configured to be coupled to an axle of a wheel. The cart may include a handle clamp configured to be coupled to an edge portion of the planar member and a handle configured to be coupled to the handle clamp.