Compact Hedge Cutter Layout for Lower Weight and Better Balance
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Solution Overview
Problem
Conventional electric hedge cutters are heavy and difficult for common users to operate, necessitating a more portable and easy-to-use alternative.
Innovation Solution
The hedge cutter features an in-line arrangement of the driving motor, printed circuit board assembly, and transmission mechanism, along with a compact design that includes a detachable battery pack and adjustable handles, enhancing human-machine interaction and reducing weight and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a gear reduction mechanism is used to convert rotary driving force into larger torque and lower speed, then cutting performance is improved, but device weight increases
Solution Approach 1:
The patent replaces the traditional mechanical gear reduction mechanism with a direct-drive motor system. The motor's rotary shaft is directly connected to the cutting blade through a transmission belt, eliminating complex gear mechanisms. This substitution reduces the number of moving parts and overall device weight while maintaining sufficient cutting torque through optimized motor selection and direct transmission geometry.
Solution Approach 2:
The patent segments the hedge cutter into modular components: a lightweight housing, a separate motor assembly, and a cutting blade assembly connected by a transmission belt. This segmentation allows for optimized weight distribution and eliminates the need for a single heavy integrated gear mechanism, distributing functional requirements across lighter, separate components.
2Volume of moving object
If a compact design is implemented to reduce device size, then portability is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The patent introduces a transmission belt as an intermediary element between the motor and cutting blade. This belt-driven system creates operational pauses during the cutting cycle (as the belt transmits motion intermittently), allowing the motor to cool down between active cutting phases. Additionally, the belt tensioning mechanism and housing design incorporate ventilation channels that facilitate heat dissipation without increasing overall device volume.
3Productivity
If the cutting blade moves at high speed, then cutting efficiency is improved, but control precision deteriorates
Solution Approach 1:
The patent employs periodic reciprocating motion of the cutting blade through a crank-slider mechanism driven by the motor. The blade moves forward at high speed for cutting, then reverses and pauses at the end of each stroke. This periodic action pattern provides natural deceleration and positioning points, allowing the operator to control the cutting depth and position precisely while maintaining high cutting speeds during the forward stroke.
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 compact design and balanced barycenter facilitate easier operation, providing a lightweight and efficient cutting performance with improved safety and comfort for users.
Implementation Method 1
a heat radiator is disposed between the driving motor assembly and the printed circuit board assembly
Implementation Method 2
a heat radiator is disposed between the driving motor assembly and the printed circuit board assembly
Data Source
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Figure 6~7
AI summary
The present invention discloses an electric garden instrument, in particular a hedge cutter. The hedge cutter comprises a driving motor disposed in a casing, a transmission mechanism disposed in the casing and coupled with the driving motor, a blade arrangement extending from the casing and coupled with the transmission mechanism, and a printed circuit board assembly disposed in the casing and mounted at one end of the driving motor, wherein the shape of the printed circuit board assembly corresponds to the cross-section of the driving motor, and wherein the in-line arrangement of the driving motor and the printed circuit board assembly is perpendicular to the longitudinal axis of the blade arrangement. The electric garden instrument of the present invention is portable and easy to operate.