Wheelbarrow Pan Bolt Head Recesses for Scraping Safety
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Solution Overview
Problem
Wheelbarrows with exposed bolt heads in the carrying space pose a risk of damage when scraping materials, and the limited fastening area on sloping pans compromises structural integrity.
Innovation Solution
The wheelbarrow design features bolt head depressions that keep the fastening mechanism heads within a depression plane, allowing for a smooth, continuous carrying surface and increased spacing between fasteners for enhanced structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bolt heads are exposed on the carrying surface, then fastening is simplified, but the risk of damage during scraping increases
Solution Approach 1:
The bolt heads are extracted from the carrying surface by positioning them within recesses formed in the pan. This removes the harmful protruding bolt heads from the carrying surface while maintaining the fastening function, allowing scraping operations to proceed without damage risk to the bolt heads or tools.
Solution Approach 2:
The bolt heads are nested within recesses in the pan structure. The recesses accommodate the bolt heads, keeping them recessed below the carrying surface level. This nesting approach maintains the fastening function while protecting the bolt heads from scraping tool impacts.
2Area of stationary object
If fasteners are placed on sloping portions of the pan, then fastening area is increased, but structural integrity is compromised
Solution Approach 1:
The recesses are specifically positioned in the generally planar base portion of the pan where structural integrity is maintained, rather than on sloping portions. This local placement strategy allows the fasteners to be secured in areas with better structural support while still providing adequate fastening area through the distributed recess locations.
Data Source
AI summary
A wheelbarrow for transporting materials includes an undercarriage, a wheel rotatably mounted to the undercarriage, a pan mounted to and supported by the undercarriage and a fastening mechanism having a head. The pan includes a base wall and an upright wall extending upwardly from the base wall. The base wall and upright wall define a carrying space and a carrying surface facing the carrying space. A depression is formed in the pan defining a depression plane that is generally continuous with the carrying surface. The fastening mechanism mounts the pan to the undercarriage such that the head is positioned within the depression between the undercarriage and the depression plane.