Wheelbarrow Tip-Up Tray with Movable Pivot Guide
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Solution Overview
Problem
Existing wheelbarrows face difficulties in reliably tipping up the tray for dumping loads and returning to the transport position, requiring significant force and often resulting in limited tipping angles or unreliable operation.
Innovation Solution
The wheelbarrow features a guide for the pivot axis that allows its displacement along the tray between two positions, enabling controlled tilting of the tray relative to its center of gravity, and a chassis design that projects forward from the wheel axis, allowing efficient tilting with minimal effort and preventing undesired tipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tray is tipped up by tilting the chassis backward about the axis of rotation of the wheels, then the tray can be dumped, but a large force has to be exerted and the second stage of tipping is not achieved reliably
Solution Approach 1:
The pivot axis is made movable along a guide path instead of being fixed, allowing its position to change dynamically during the tipping operation. This dynamic adjustment enables the pivot axis to move to an optimal position that reduces the tipping moment and allows reliable dumping with reduced effort
Solution Approach 2:
A guide mechanism is introduced as an intermediary between the fixed chassis and the movable tray, allowing the pivot axis to move along a controlled path. This guide mediates the interaction between the chassis tilting and tray dumping, enabling the tray to tip reliably with reduced force
2Ease of operation
If the chassis projects far forward from the axis of rotation of the wheel, then a small amount of tilting results in substantial tray tilting, but the center of gravity rises and undesired tipping may occur
Solution Approach 1:
The movable pivot axis allows the system to dynamically adjust its configuration. During tilting, the pivot axis moves along the guide to maintain an optimal position that maximizes tilting efficiency while minimizing the risk of undesired tipping, adapting to the changing geometry of the system
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
This design enables easier and more reliable tipping of the tray for dumping and returning to the transport position, reducing the effort required to manage loads and preventing wheelbarrow tipping, while maintaining stability during transport.
Implementation Method 1
the tray is provided with a guide for allowing guided displacement of the pivot axis along the tray between a first position and a second position
Implementation Method 2
the chassis can project relatively far forward from the axis of rotation of the wheel or wheels towards the pivot axis, so that a relatively small amount of tilting of the chassis about the axis of rotation of the wheel or wheels can result in a substantial amount of tilting of the tray
Data Source
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AI summary
A wheelbarrow having a tray pivotable about a pivot axis relative to a chassis from a load carrying position to a dumping position in which said bottom is pivoted forwardly away from the chassis. The tray is provided with a guide for allowing guided displacement of the pivot axis along the tray between a first position and a second position. The pivot axis is in the first position if the tray is in a load carrying position. The second position of the pivot axis is rearward from the first position of said pivot axis. Methods of using such a wheelbarrow are also disclosed.