Trimmer Guard Grooves for Noise Reduction
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Solution Overview
Problem
Conventional trimmers generate high noise levels during operation, which can have negative physiological and psychological effects on operators, and existing noise reduction solutions are inadequate.
Innovation Solution
A trimmer guard with a body featuring an arc-shaped outer side, angled flanges, and multiple grooves along the first flange to house the rotary cutting tool, reducing noise through destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional solid trimmer guard design is used, then structural simplicity and manufacturing ease are maintained, but noise reduction capability is insufficient
Solution Approach 1:
The trimmer guard is segmented into multiple functional regions: a deck portion, a skirt portion, and a flange portion with multiple grooves. The grooves are further segmented as discrete features along the flange. This segmentation allows each region to perform its specific function while collectively achieving noise reduction through the grooved structure that directs airflow and disrupts noise propagation paths.
Solution Approach 2:
The invention transitions from a conventional two-dimensional flat guard design to a three-dimensional structured design with vertical grooves extending from the flange. This adds a vertical dimension to the guard structure, creating airflow channels and noise disruption paths that were not present in flat designs, thereby improving noise reduction capability.
2Object-affected harmful factors
If noise reduction features are added to the trimmer guard, then noise levels decrease, but manufacturing complexity increases
Solution Approach 1:
The noise reduction grooves are merged into the flange portion of the guard, combining the structural support function of the flange with the noise reduction function of the grooves. This integration allows the noise reduction features to be formed as part of the same molding process, avoiding additional manufacturing steps and maintaining ease of production.
Solution Approach 2:
The grooves are designed with specific parameters optimized for noise reduction while maintaining manufacturability: the number of grooves (5-15), their depth (0.5-2mm), width (1-3mm), and spacing are all within ranges that can be easily formed by standard injection molding processes, ensuring ease of manufacture.
3Object-affected harmful factors
If more grooves are added to the flange, then noise reduction effectiveness increases, but the size and transportation cost increase
Solution Approach 1:
The grooves are localized to specific regions of the flange where they are most effective for noise reduction, rather than uniformly distributing features throughout the entire guard. The grooves are positioned along the outer circumference of the flange, creating localized airflow disruption and noise reduction zones that achieve effective noise control without increasing overall guard volume.
Solution Approach 2:
The invention uses a moderate number of grooves (5-15) rather than excessive numbers, providing sufficient noise reduction effectiveness while avoiding unnecessary increases in guard size. This partial action approach achieves the required noise reduction level without the diminishing returns that would occur with excessive groove numbers.
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 trimmer guard effectively reduces noise levels by up to 2dB, maintaining safety and simplicity while avoiding increased size and transportation costs.
Implementation Method 1
reducing noise through destructive interference
Data Source
Figure 1
Figure 2A~2C
Figure 2D~2E
AI summary
A trimmer guard with a body comprising a deck, a skirt, and a first flange. The deck includes an inner side adapted for connecting the trimmer guard to a trimmer; an outer side that is substantially arc-shaped; a first edge arranged between the inner side and the outer side; and a second edge opposite the first edge and arranged between the inner side and the outer side. The skirt extends from the outer side at an angle to the deck. The first flange is arranged at the first edge at an angle to the deck. When the trimmer guard is connected to a trimmer, the deck and the skirt together define a space for housing a rotary cutting tool of a cutting assembly of the trimmer. A plurality of grooves arranged along the first flange are arranged to reduce noise generated by the trimmer during operation.