Utility Cart Asymmetric Wheel Spacing Stability
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Solution Overview
Problem
Conventional transport devices like wheelbarrows and garden carts are difficult to control, prone to tipping, and require significant strength to dump, making them inefficient for transporting heavy yard and garden materials.
Innovation Solution
A utility cart design featuring a frame with a bed that rotates between a transport position and a dumping position, with rear wheels spaced wider than the bed to enhance stability and reduce the effort required for dumping, and a tongue connected to the axle beam for steering and towing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wheel design is used (wheelbarrow), then the device is simple in structure, but it is hard to control and prone to tipping
Solution Approach 1:
The cart divides the wheel support function into multiple segments: a front wheel for steering and a rear wheel for support, rather than using a single wheel. This segmentation allows the cart to be pulled from the front while maintaining stability, resolving the contradiction between structural simplicity and control ease.
2Ease of operation
If the bed is made rotatable for dumping, then dumping capability is improved, but the device complexity increases
Solution Approach 1:
The bed is designed as a rotatable component that can dynamically change position between horizontal (transport) and angled (dumping) orientations. This dynamic capability allows the same structure to serve multiple functions without requiring separate mechanisms, improving dumping ease while minimizing added complexity.
3Stability of the object's composition
If rear wheels are spaced wider apart, then lateral stability is improved, but the cart width increases
Solution Approach 1:
The cart employs asymmetric wheel spacing where rear wheels are positioned wider apart than the front wheel spacing. This asymmetric arrangement creates a wider base of support at the rear, improving lateral stability without requiring the entire cart to be wider, thus resolving the contradiction between stability and compact width.
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 utility cart provides improved stability and ease of use by allowing for controlled dumping with reduced effort, as the bed can be easily tilted between transport and dumping positions, and the wider rear wheel spacing enhances lateral stability.
Implementation Method 1
a bed rotatably mounted about a pivot axis to the frame, the bed rotatable between a transport position in which the bed extends generally parallel to the frame and a dumping position in which the bed extends at an angle to the frame
Implementation Method 2
the second distance is less than the first distance, whereby when the bed is moved to the dumping position at least a portion of the bed is located between the first side and the second side of the rear of the frame
Data Source
AI summary
A utility cart comprises a frame supported by first and second front wheels mounted for rotation about a front wheel axis and spaced apart by a first distance and first and second rear wheels mounted for rotation about a rear wheel axis and spaced apart by a second distance, and a bed mounted to the frame and configured for rotational movement between a transport position and a dumping position about a pivot axis, the pivot axis being located between the front wheel axis and the rear wheel axis, wherein the second distance is greater than the first distance and a width of the bed, whereby when the bed is moved to the dumping position the bed is located between the rear wheels.