String Trimmer Head with Streamlined Protection Structure
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Solution Overview
Problem
Existing string trimmers face issues with trimmer line breakage due to high-speed rotation, difficulty in visualizing the trimming range, and noise pollution, as the line frequently curls, rubs against the housing, and hits obstacles.
Innovation Solution
A string trimmer with a streamlined protection structure that includes a rotating spool and a housing with a threading hole, where the trimmer line is wound and passes through a passage, featuring a fluorescent coating or light-emitting element for visualization and a streamlined design to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the trimmer line rotates at high speed to improve trimming efficiency, then the productivity increases, but the trimmer line frequently curls and breaks off due to hitting obstacles and rubbing against the housing
Solution Approach 1:
The patent introduces a streamlined protection structure as an intermediary component between the trimmer line and the external environment. This protection structure guides the trimmer line through a controlled passage, preventing it from curling and rubbing against the housing, thereby resolving the contradiction between high-speed rotation efficiency and line durability
Solution Approach 2:
The protection structure is pre-installed and configured to guide the trimmer line through a designated passage before the trimming operation begins. This preliminary arrangement ensures that the trimmer line follows a predetermined safe path, preventing contact with obstacles and housing surfaces during high-speed rotation
2Productivity
If the trimmer line rotates at high speed to improve trimming efficiency, then the productivity increases, but the rotation boundary becomes blurred making it difficult for the user to determine the trimming range
Solution Approach 1:
The patent applies a fluorescent coating on the protection structure that emits light during rotation, creating a visible rotation boundary. This color/optical change allows users to clearly observe the trimming range even at high rotation speeds, resolving the contradiction between productivity and visualization difficulty
3Productivity
If the trimmer line rotates at high speed to improve trimming efficiency, then the productivity increases, but pretty large pneumatic noise is generated resulting in noise pollution
Solution Approach 1:
The patent designs the protection structure with a streamlined, curved passage that guides the trimmer line smoothly. This curved geometry reduces turbulence and air resistance during high-speed rotation, significantly decreasing pneumatic noise generation while maintaining trimming efficiency
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 protection structure prevents curling and rubbing, reduces breakage, enhances visualization of the trimming range, and significantly decreases pneumatic noise during operation.
Implementation Method 1
The identification part includes a fluorescent coating, a light-emitting element, or a warning mark
Implementation Method 2
The identification part includes a fluorescent coating, a light-emitting element, or a warning mark
Implementation Method 3
the tail of the protection structure has a section which is a streamlined structure with a circular front and a cuspate rear
Data Source
AI summary
The string trimmer includes a connecting rod, a string trimmer head, and an operation part. The string trimmer head includes a trimmer line, a spool, a housing, and a streamlined protection structure. The spool is configured to wind the trimmer line and is capable of rotating about a first axis. The housing has an accommodating cavity for accommodating at least part of the spool and a threading hole for the trimmer line to extend to an outer side of the housing. The protection structure includes a head, a tail and a passage through which the trimmer line penetrates. The head is connected to the housing, the tail extends on the outer side of the housing, and the passage is configured to accommodate the trimmer line penetrating through the threading hole and expose the trimmer line out of the tail of the protection structure.