Coaxial Handle Control Rods for Hand-Push Garden Tools
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Solution Overview
Problem
The structural interference between control rods of self-propelled and mowing motors on lawn mowers results in inconsistent distances from the handle, leading to poor operating experiences due to non-coaxial arrangements.
Innovation Solution
A garden tool design featuring coaxially arranged first and second control rods on a handle assembly, with each control rod having a cam mechanism and elastic pieces for resetting, allowing for coordinated operation and improved user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two control rods are arranged on both sides of the handle, then the control rods can be installed separately, but the distances between the control rods and the handle become inconsistent resulting in poor operating experience
Solution Approach 1:
The patent merges the two control rods into a single integrated control assembly that rotates together around a common axis. This allows both control functions (self-propelled motor and mowing motor) to be controlled by a single rotational motion, eliminating the need for separate control rod installations while ensuring consistent distances from the handle and improving operating experience.
2Adaptability or versatility
If two control rods are arranged on both sides of the handle, then each control rod can control different functions, but the non-coaxial arrangement creates structural interference
Solution Approach 1:
The patent creates a universal control assembly where a single rotating control rod structure serves multiple functions. The control assembly includes a first control portion for controlling the self-propelled motor and a second control portion for controlling the mowing motor, both integrated into one coaxial rotating structure, thereby eliminating structural interference while maintaining functional separation.
3Ease of operation
If control rods are arranged coaxially, then the operating experience is improved, but the control mechanism becomes more complex
Solution Approach 1:
The patent segments the control mechanism into distinct functional portions: a first control portion with a first cam for the self-propelled motor and a second control portion with a second cam for the mowing motor. Each portion can be independently designed and adjusted, which simplifies the overall control mechanism while maintaining the beneficial coaxial arrangement for improved operating experience.
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 coaxial arrangement of control rods enhances operational convenience, tidiness, and space efficiency, improving user experience by allowing for synchronized control of the garden tool's functions.
Implementation Method 1
a first elastic piece that can drive the first control rod to reset and a second elastic piece that can drive the second control rod to reset
Implementation Method 2
a first cam that is installed on the first protruding portion and can trigger the first switch, the first control rod is coaxially connected with the first cam, and when the first control rod is rotated, the first cam can be driven to trigger the first switch
Data Source
AI summary
The invention provides a hand-push garden tool and a control method thereof. The hand-push garden tool comprises a main body, wheel and a handle assembly. The wheels are mounted on the main body, the handle assembly is mounted on the main body. The handle assembly comprises a handle, a first control rod and a second control rod. The first control rod is mounted on the handle and can rotate relative to the handle, the second control rod is mounted on the handle and can rotate relative to the handle, and the first control rod and the second control rod are coaxially arranged. The first control rod and the second control rod of the hand-push garden tool can coaxially rotate and cannot affect each other, the garden tool is convenient, beautiful and clean and tidy, and design spaces are saved.