Electric Pull Cart With Foldable Frame and Adjustable Motor Assistance
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Solution Overview
Problem
Conventional outdoor wagons are laborious to push and pull when conveying heavy loads due to the lack of mechanical assistance, especially in uneven outdoor environments.
Innovation Solution
An electric wagon equipped with a drive motor to rotate driving wheels and a detachable battery pack connection for power supply, featuring a foldable frame, handle device, and a controller to adjust assistance based on user input and wagon parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional wagon is used to convey heavy loads, then the wagon can transport materials, but it becomes laborious to push and pull especially in uneven outdoor environments
Solution Approach 1:
The patent replaces the purely mechanical manual pushing/pulling system with an electric motor-driven system. The drive motor converts electrical energy to mechanical energy to propel the wagon, substituting human physical effort with an electric power source. This resolves the contradiction by eliminating the need for users to exert force to move heavy loads, while maintaining the wagon's ability to transport materials.
Solution Approach 2:
The patent changes the operational parameters of the wagon by introducing variable motor assistance levels. The controller can adjust the motor's output power and torque based on terrain conditions and load weight, optimizing the balance between user effort and motor assistance. This allows the system to adapt to different operating conditions, providing sufficient force on uneven terrain while maintaining ease of operation during normal use.
2Ease of operation
If an electric motor is added to assist with heavy loads, then user effort is reduced, but the device complexity increases
Solution Approach 1:
The patent implements a detachable battery pack that can be removed and used to power other electrical devices. This multi-functional design allows the battery pack to serve dual purposes: powering the drive motor for wagon movement and providing electrical power for external devices. By making the battery pack universal and detachable, the system reduces overall complexity while maintaining the electric assistance function, as the same power source serves multiple functions.
Solution Approach 2:
The patent divides the power supply system into a detachable battery pack that can be separated from the wagon body. This segmentation allows the battery to be independently removed, charged, or used with other devices, simplifying the overall system architecture. The modular design reduces the complexity of integrating power management into the main wagon structure, as the battery pack functions as an independent, self-contained unit.
3Adaptability or versatility
If a detachable battery pack is used for power supply, then adaptability is improved, but the reliability of continuous power supply may be affected
Solution Approach 1:
The detachable battery pack is designed with a universal coupling interface that can be used both for powering the wagon's drive motor and for charging external electrical devices. This multi-functional capability enhances adaptability without compromising reliability, as the same proven battery design serves multiple purposes. The universal interface ensures consistent electrical connections across different applications.
Solution Approach 2:
The controller monitors the battery pack's charge level and provides feedback to the user through display indicators. When the battery charge drops below a threshold, the system alerts the user to recharge or replace the battery pack. This feedback mechanism ensures continuous reliable operation by preventing sudden power loss, while the detachable design maintains adaptability for various power supply scenarios.
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
The electric wagon reduces user effort by providing electrical assistance, allowing easier maneuvering of heavy loads over varied terrain, with adaptable power sources and adjustable motor assistance.
Implementation Method 1
drive motor configured to drive driving wheels to rotate
Implementation Method 2
power supply connection portion configured to be detachably connected to a battery pack for supplying power to the drive motor
Data Source
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AI summary
Provided are an electric wagon and an electronically power assisted wagon. The electric wagon includes a wagon body including at least a foldable frame; a handle device connected to the wagon body; a walking assembly including at least driving wheels; a drive motor configured to drive the driving wheels to rotate; a power supply connection portion configured to be detachably connected to a battery pack for supplying power to the drive motor; and a controller electrically connected to at least the drive motor to control the drive motor to rotate.