Handheld Lawn Mower Automatic Shutoff Mechanism
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Solution Overview
Problem
Conventional lawnmowers, especially push mechanical and gasoline motor-driven models, are difficult to use and can get stuck, and even cordless electric models require setup time and may not be suitable for small or irregularly shaped lawns.
Innovation Solution
A handheld lawnmower with automatic power shutoff when lifted off the ground, featuring a cylindrical housing, electric motor, blade assembly, and safety features like pass code buttons and speed foldback routine to prevent battery drain, along with a retractable safety cover and exhaust port for clippings, allowing for easy maneuverability and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional push mechanical lawnmower is used, then it can cut grass effectively, but it is difficult to use and has a tendency to get stuck
Solution Approach 1:
The patent replaces the mechanical push lawnmower system with an electric motor-driven system. The electric motor eliminates the need for manual pushing and mechanical transmission components that prone to getting stuck, providing more reliable and easier operation.
Solution Approach 2:
The patent introduces automatic speed control and lift detection mechanisms that dynamically adjust the lawnmower's operation. The system automatically detects when the lawnmower is lifted and shuts off the motor, preventing unnecessary operation and potential getting stuck issues.
2Power
If a gasoline motor driven lawnmower is used, then it provides sufficient power, but it produces loud sound pollution
Solution Approach 1:
The patent replaces the gasoline internal combustion engine with an electric motor. This substitution eliminates the loud noise generated by combustion engines while maintaining sufficient cutting power through electric drive.
3Object-generated harmful factors
If a cordless electric lawnmower is used, then it provides quiet operation, but it requires setup time
Solution Approach 1:
The patent introduces automatic lift detection that shuts off the motor when the lawnmower is lifted from the ground. This eliminates the need for manual setup and shutdown procedures, allowing the user to simply pick up the lawnmower to stop it and set it down to resume operation.
4Ease of operation
If a handheld lawnmower with automatic shutoff is used, then it enables easy maneuverability, but it requires sensors and control mechanisms
Solution Approach 1:
The patent implements automatic lift detection and motor shutoff functionality that operates without user intervention. The system serves itself by automatically detecting when it is lifted and shutting off the motor, eliminating the need for manual control mechanisms.
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
Enables efficient cutting of small areas without the need for extensive setup, reduces noise pollution, and provides safety features to prevent accidents, making it suitable for odd-shaped lawns and reducing battery drain during use.
Implementation Method 1
An electric motor is connected to a top portion of the housing at a blade assembly cap
Implementation Method 2
A battery is electrically connected to the electric motor
Data Source
AI summary
A handheld lawnmower has a housing and a pair of wheels mounted on an axle. The axle is mounted to the housing. A handle mount is formed on the housing. The handle is connected to the handle mount, and the handle extends above the housing. An electric motor is connected to a top portion of the housing at a blade assembly cap. A blade assembly has a blade connection header, and a blade shaft is connected to the blade connection header at a blade shaft first end. The blade shaft is connected to a blade junction at a blade shaft second end, and a blade has a leading edge. The blade assembly is mounted in a direction to provide a flat cutting angle for the blade. A battery is electrically connected to the electric motor.