Flexible Shield for String Trimmer Vegetation Protection

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Solution Overview

Problem

Traditional string trimmer guards fail to effectively protect non-target vegetation from damage, as they allow the cutting line to contact and damage objects like tree bases and bush leaves due to open sections around the rotating head, leading to unwanted pruning.

Innovation Solution

A removable, flexible shield with a perimeter ring and adjustable fasteners is designed to surround the trimmer head, allowing it to bend and deform when contacting objects, preventing damage while allowing the cutting line to reach a larger surface area without contacting protected plants, and includes an optional net for added protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional guards with open sections are used, then the operator can see what they are trimming and access hard-to-reach areas, but the cutting line contacts objects like tree bases and plant leaves causing damage

Engineering Contradiction:

Improvevisibility and access to trimming areasVSAvoiddamage to non-target vegetation

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent employs a flexible shield wall made of thin film material that can bend and deform when contacting objects like tree bases or plant leaves. This flexibility allows the shield to conform to obstacles without allowing the cutting line to contact and damage the objects, while still providing effective protection. The thin film nature enables the shield to flex without breaking and return to its original position.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent introduces a vertical dimension by extending the shield wall upward from the trimmer head, creating a three-dimensional barrier that encloses the cutting line path. This vertical extension prevents the cutting line from contacting objects that would otherwise be in its path, while the shield's positioning maintains operator visibility and access to the trimming area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Object-affected harmful factors

If a full guard is used to protect vegetation, then the cutting line is contained, but the operator cannot see what they are trimming

Engineering Contradiction:

Improveprotection from cutting line contactVSAvoidvisibility of trimming area

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The flexible shield wall provides continuous protection around the trimmer head while its thin, translucent nature allows light to pass through, maintaining operator visibility of the trimming area. The flexibility enables the shield to conform to the trimmer head shape while providing unobstructed viewing through the material.

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-affected harmful factors

If rigid shields are used to protect vegetation, then protection is effective, but the shields cannot adapt to contact with various objects

Engineering Contradiction:

Improveprotection effectivenessVSAvoidability to contact and deform on objects

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The shield wall is constructed from flexible thin film material that can bend and deform when contacting objects of various shapes and sizes. This flexibility allows the shield to adapt to different trimming environments and obstacles while maintaining continuous protection, unlike rigid shields that would either break or create gaps when contacting irregular objects.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The shield wall transitions from a static rigid structure to a dynamic flexible barrier that can change shape in response to external forces. When the shield contacts objects like tree bases or rocks, it dynamically deforms to accommodate the obstacle while maintaining its protective function, then returns to its original position.

Inventive Principle:

Principle #15Dynamics

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 flexible shield effectively protects non-target vegetation by preventing damage from the cutting line, allowing for selective trimming of tall grass and weeds while safeguarding plants, and also shields the user from debris.

Implementation Method 1

the second length of the perimeter ring is capable of bending or deforming when an outer surface of the second length of the perimeter ring is moved into contact with one or more structures

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20240306537A1Shield and attachment for weed trimming

Publication Date: 2024.09.19 VISTA STUDIOS INC

AI summary

A removable shield for a string trimmer with trimmer head for cutting tall grass or weed is a flexible shield having a first end and a second end with a length extending therebetween; a removable shield closure for securing the first end of the shield to the second end; one or more fasteners configured for coupling the shield to the string trimmer at one or more locations on the shield. The shield forms a perimeter ring having a height and an interior space when the shield closure secures the first end of the shield to the second end of the shield and wherein when installed on the string trimmer, the trimmer head is within an interior space of the perimeter ring when the shield is installed on the trimmer head.