Wheelbarrow Wheel Guard Tine Geometry for Wider Wheels
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Solution Overview
Problem
Standard wheelbarrows are designed to accommodate 4-inch wide wheels, but a 6-inch wide wheel does not fit properly due to the existing wheel guard configuration, leading to contact issues and a need for an adaptable wheel guard that can accommodate wider wheels as a replacement part.
Innovation Solution
A wheel guard with tines that have a reduced lateral width, specifically thinner proximal ends and thicker distal ends, allowing for a 6-inch wide wheel to fit without contacting the guard, while maintaining alignment with the frame assembly and handle portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard wheelbarrow frame assembly is used with a conventional wheel guard, then manufacturing costs and assembly costs are reduced due to mass production, but a 6-inch wide wheel cannot be accommodated because it contacts the wheel guard
Solution Approach 1:
The wheel guard tines are designed with non-uniform thickness, being thinner at the proximal end (near the bight) and thicker at the distal end (near the yoke). This local variation in geometry allows the tines to diverge outward, creating sufficient clearance for wider 6-inch wheels while maintaining proper alignment and structural integrity at the yoke connection point
Solution Approach 2:
The invention modifies the geometric parameters of the wheel guard tines by varying their lateral thickness along their length. This parameter change transforms the wheel guard from a uniform cross-section structure to a tapered structure, enabling it to accommodate wheels of different widths while maintaining compatibility with the standard frame assembly
2Weight of moving object
If a 6-inch wide wheel is installed on a standard wheelbarrow, then load capacity is increased, but the wheel contacts the wheel guard causing operational issues
Solution Approach 1:
The tapered thickness of the tines creates localized clearance zones near the bight where the wheel makes contact, while maintaining proper alignment and support at the distal ends near the yoke. This allows wider wheels to rotate freely without contacting the guard
3Adaptability or versatility
If a wheel guard with reduced lateral width tines is used, then a 6-inch wide wheel fits without contacting the guard, but the alignment with handle portions may be compromised
Solution Approach 1:
The tines are designed with different thicknesses at different locations: thinner at the proximal end to accommodate wide wheels and thicker at the distal end to maintain proper alignment with the handle portions and yoke, achieving both goals simultaneously
Solution Approach 2:
The wheel guard tines exhibit asymmetric thickness distribution along their length, being thinner near the bight and thicker near the yoke. This asymmetric geometry allows the tines to diverge outward for wheel clearance while maintaining proper alignment with the frame assembly
Data Source
AI summary
A wheelbarrow including a wheel guard having tines with a reduced lateral width. The wheelbarrow has a frame assembly with two handle assemblies that are angled toward each other terminating in a forward yoke. The wheel guard has a bight, a first and second tine, each tine having a proximal end structured to be coupled to the bight and distal end structured to be coupled to the wheelbarrow yoke. Each tine has a longitudinal axis that is generally aligned with a handle assembly longitudinal axis. The first and second tine distal ends each have a first lateral thickness and each first and second tine proximal end has a second lateral thickness. The first and second tine distal end first lateral thickness is greater than the first and second tine proximal end second lateral thickness.