Three-Wheel Wheelbarrow Ergonomic Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wheelbarrows require users to lift part of the load during transport, leading to ergonomic inefficiencies and increased user loading, which is not compliant with health and safety standards.
Innovation Solution
A wheelbarrow design with at least three wheels, push handles, lifting handles, and a push bar that allows for ergonomic handling and tilting of the frame without lifting, reducing user loading and enabling smooth navigation over irregular surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wheelbarrow is designed with traditional single front wheel and manual lifting mechanism, then the structure is simple, but the user loading on the back increases significantly
Solution Approach 1:
The wheelbarrow is divided into three separate wheels instead of traditional single or two-wheel configurations. This segmentation of the support system distributes the load across three contact points, reducing the lifting effort required from the user while maintaining structural simplicity
Solution Approach 2:
The invention transitions from traditional 2D wheelbarrow geometry to a 3D spatial configuration with three wheels arranged in a triangular support plane. This dimensional change creates enhanced stability and load distribution, allowing the user to push without lifting, thereby reducing back loading
2Ease of operation
If push handles are positioned high for ergonomic pushing, then pushing comfort improves, but the ability to navigate narrow surfaces decreases
Solution Approach 1:
The wheelbarrow frame is designed to be dynamically tiltable around the rear wheels. This dynamic capability allows the front wheel to be raised clear of the ground when needed, enabling navigation through narrow surfaces while maintaining high push handles for ergonomic pushing during normal operation
Solution Approach 2:
The lifting handles serve multiple functions: they enable frame tilting for load discharge, assist in raising the front wheel for narrow surface navigation, and provide additional leverage points. This multi-functionality resolves the contradiction between ergonomic pushing and navigation adaptability
3Productivity
If the wheelbarrow is designed to tilt easily for load discharge, then loading efficiency improves, but stability during transport decreases
Solution Approach 1:
The three wheels are positioned asymmetrically with the front wheel at one end and two rear wheels spaced apart at the other end. This asymmetric arrangement creates natural pivot points that facilitate easy tilting for load discharge while maintaining stability during straight-line transport
Solution Approach 2:
The lifting handles act as intermediary levers that mediate between the user's pushing force and the frame's tilting motion. By providing mechanical advantage through these handles, the system achieves easy load discharge while the three-wheel base maintains transport stability
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a device for transporting a load, comprising a carrier; a frame supporting the carrier; which frame is provided with at least one front wheel; and at least two spaced apart rear wheels; two push handles connected to the frame; which push handles are situated on the side of the carrier remote from the frame and extend in a direction substantially perpendicularly of the support plane defined by the wheels; two lifting handles connected to the frame, which lifting handles are situated closer to the support plane defined by the wheels than the push handles and extend in a direction substantially parallel to the support plane defined by the wheels; and a push bar connected to the frame, which push bar extends substantially parallel to the support plane defined by the wheels.