Hedge Trimmer Weight Layout for Front Power and Easier Lifting
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Solution Overview
Problem
Conventional hedge trimmers are bulky and heavy, making them difficult to lift and operate, and often have insufficient power due to a rear motor design, leading to a poor user experience.
Innovation Solution
A hedge trimmer design that reduces the weight of the power assembly by placing the battery pack behind and connecting it to the power assembly via a connecting rod, ensuring the power assembly accounts for less than 46% of the total weight, while maintaining cutting performance and prolonging usage duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power assembly is placed at the front of the hedge trimmer, then the cutting performance is improved, but the weight distribution causes the trimmer to be bulky and difficult to lift
Solution Approach 1:
The patent divides the power assembly into separate modular components: the motor unit remains at the front for cutting performance, while the battery pack is separated and positioned at the rear. This segmentation allows independent optimization of each component's location, achieving both front-weighted cutting power and rear-weighted balance for ease of lifting.
Solution Approach 2:
The patent transitions from a traditional single-location power assembly to a distributed power system across different spatial dimensions. The power delivery mechanism extends along the connecting rod from rear to front, creating a linear power transmission path that distributes weight along the tool's length rather than concentrating it at one end.
2Ease of operation
If the battery pack is placed at the rear of the hedge trimmer, then the ease of lifting is improved, but the power transmission distance increases
Solution Approach 1:
The patent introduces a connecting rod as an intermediary component that bridges the rear battery pack and front motor unit. This connecting rod serves as both a structural support and a power transmission medium, allowing efficient energy delivery over the extended distance while maintaining structural integrity and enabling the rear-weighted balance for ease of lifting.
3Ease of operation
If the power assembly weight is reduced, then the ease of lifting is improved, but the cutting performance may be compromised
Solution Approach 1:
The patent applies local quality by concentrating the high-power motor unit at the front cutting end where maximum power is needed, while using a lighter battery pack at the rear for balance. The motor unit is designed with high power-to-weight ratio characteristics, providing sufficient cutting performance with minimal weight, while the battery pack provides necessary energy without excessive mass.
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 design reduces the effort required to lift the trimmer, enhances user convenience, and maintains cutting performance by distributing weight and center of gravity, thereby extending the operator's tolerance time.
Implementation Method 1
the motor is an external rotor motor, and the motor is connected in transmission with the transmission assembly
Implementation Method 2
the transmission assembly includes a bull gear, a pinion and a connecting component, the pinion is fixed to an output shaft of the external rotor motor, the bull gear meshes with the pinion
Implementation Method 3
A first end of the connecting rod is fixedly connected with the power assembly and a second end of the connecting rod is connected with a battery pack cavity
Data Source
AI summary
A hedge trimmer includes a blade assembly, a power assembly, a battery pack, a connecting rod and a handle assembly. A first end of the connecting rod is fixedly connected with the power assembly and a second end of the connecting rod is connected with a battery pack cavity. The battery pack is mounted in the battery pack cavity, and the power assembly accounts for less than 46% of a weight of the hedge trimmer. The disclosure reduces a weight of the power assembly at a front end through placing the battery pack behind, and a hedge trimmer may not turn its head, which shortens an overall length requirement of the hedge trimmer. Therefore, a weight of the hedge trimmer is reduced, and a structure of the hedge trimmer is compact.