Power-Assisted Wheelbarrow Curved Dump Brace Design
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Solution Overview
Problem
Current motorized wheelbarrows fail to replicate the maneuverability and dumping mechanism of manual wheelbarrows, as they require additional effort to balance and tilt due to the added weight of the drive system, and often damage landscaping surfaces with their sharp dump braces.
Innovation Solution
A power-assisted wheelbarrow design with a rolled dump brace that transfers the weight of the drive system and batteries gradually, allowing for easy tilting and dumping without ground contact, and a motor placement between the wheels to maintain balance and reduce the moment of force required for directional orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motorized wheelbarrow is equipped with a conventional sharp dump brace, then it can lift the tray to dump loads, but it damages landscaping surfaces by cutting into the ground
Solution Approach 1:
The patent applies curvature by replacing the conventional sharp, angular dump brace with a rounded, curved surface. This curved dump brace contacts the ground at a single point that rolls along the surface as the tray is elevated, preventing the sharp edges from cutting into landscaping surfaces while maintaining the ability to lift and dump loads effectively
2Productivity
If the dump brace is designed to lift the tray to a vertical position for complete dumping, then all materials can be discharged, but the front lip and tub must be extremely strong to bear the concentrated load
Solution Approach 1:
The curved dump brace distributes the lifting force along its rounded surface as it contacts the ground during elevation. This curvature allows the force to be applied gradually along an arc rather than concentrated at a single sharp point, enabling complete dumping while reducing the peak stress requirements on the front lip and tub structure
3Adaptability or versatility
If a single wheel design is used to maintain maneuverability, then the wheelbarrow can turn freely and navigate tight spaces, but the operator must constantly balance the unit while moving
Solution Approach 1:
The patent positions the motor assembly between the wheel and the tray, and places the battery near the wheel, creating a counterweight distribution that balances the load. This strategic placement of heavy components acts as counterweight to offset the tray load, allowing the single wheel design to maintain both maneuverability and reduced balancing effort for the operator
4Ease of operation
If the motor and drive system are added to power the wheelbarrow, then movement requires less operator effort, but the added weight increases the moment of force required for directional orientation
Solution Approach 1:
The motor assembly is positioned between the wheel and tray, and the battery is placed near the wheel, creating a balanced weight distribution. This counterweight arrangement offsets the additional weight from the power system, reducing the moment of force required for directional orientation while maintaining powered propulsion assistance
5Productivity
If the frame is rotated about the single wheel axis to tilt the load carrier for dumping, then materials can be discharged, but the frame experiences high stress and the operation requires significant effort
Solution Approach 1:
The curved dump brace provides a rolling contact surface with the ground during tray elevation. This curved interface allows the frame to rotate and tilt the load carrier more smoothly, distributing the tilting effort along the curved path rather than requiring forceful rotation about a fixed sharp point, thereby reducing operator effort and frame stress
Data Source
AI summary
Embodiments relate to a power assisted wheelbarrow. The wheelbarrow includes a dumping pan and a frame assembly in contact with the dumping pan. The frame assembly includes handles, a dump brace, one or more dumping pan supports and a resting support. The wheelbarrow also includes an electrical control assembly positioned in proximity to the handles, a wheel assembly including an axel positioned transversely between two wheels, an electrical motor assembly positioned in contact with the axel and in electrical contact with the electrical control assembly, a power supply supported by the frame assembly in electrical contact with the electrical control assembly and electrical motor assembly. Wherein the dump brace includes a curvature of about ninety degrees such that when a user dumps the contents of the dumping pan, the dump brace rolls into contact with the ground and prevents the dumping pan from contacting the ground.