Deck-Mounted String Trimmer Assembly With Adjustable Turret Arms

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Solution Overview

Problem

Lawn maintenance often requires separate tasks of mowing and trimming, which are time-consuming and pose hazards due to the need for precise positioning and handling of handheld string trimmers.

Innovation Solution

A string trimmer attachment assembly for lawn mowers, featuring a deck mount, turret, adjustable arms, and a coupling system that allows for horizontal, vertical, azimuthal, and elevational adjustments, along with spring biases and limit switches for safety and impact absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If handheld string trimmers are used for precise trimming tasks, then trimming precision is improved, but operator safety and ease of operation deteriorate due to the need for fine adjustments and dexterity

Engineering Contradiction:

Improvetrimming precisionVSAvoidoperator safety and ease of operation

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The trimming system is segmented into a stationary base unit and a movable robotic arm with modular components including turret, first arm, second arm, and coupling mechanisms. This segmentation allows precise control of the trimming head while eliminating the need for manual handling, thereby maintaining trimming precision while improving operator safety.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The robotic trimming system operates autonomously without requiring continuous manual intervention. The self-service mechanism includes automated positioning, spring-biased arms that self-adjust, and limit switches that automatically deactivate the trimmer head when boundaries are reached, reducing operator workload and safety risks.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If handheld trimmers require fine adjustments for proper cutting position, then trimming precision is improved, but time consumption and productivity worsen

Engineering Contradiction:

Improvecutting position precisionVSAvoidtime consumption

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The robotic arm incorporates dynamic adjustment capabilities with movable first and second arms that can be positioned along different axes. The spring-biased mechanism allows the arms to dynamically adjust to the optimal cutting position automatically, eliminating the time-consuming manual fine-adjustment process while maintaining precise cutting position control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Manual mechanical adjustment operations are replaced with an automated robotic system that uses motorized actuation, spring mechanisms, and limit switches to achieve and maintain precise cutting positions automatically, significantly reducing the time required for trimming operations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If spring-biased arms are used for impact absorption and safety, then reliability is improved, but device complexity worsens due to additional components like limit switches and torsion springs

Engineering Contradiction:

Improvesafety and impact absorptionVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Spring-biased arms and torsion springs are pre-installed in the robotic structure to provide impact absorption and safety cushioning before any potential harmful contact occurs. These elements are integrated into the arm mechanisms and turret assembly, providing reliable protection while maintaining a relatively compact and organized structure.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

Enhances efficiency and safety by allowing seamless integration with lawn mowers, reducing manual dexterity demands and minimizing hazards through automated adjustments and impact absorption.

Implementation Method 1

a torsion spring about the support pin, the torsion spring engaged with the middle turret plate and the lower turret plate to spring bias the upper turret plate in azimuth with respect to the lower turret plate

Methodology Applied

Scientific EffectTorsion spring: Torsion Spring

Implementation Method 2

the first arm is spring biased with respect to the selected one of the multiple of positions

Methodology Applied

Scientific EffectSpring bias: Spring

Data Source

PatentUS12484476B2Deck mountable string trimmer attachment assembly

Publication Date: 2025.12.02 TRIMYXS LLC

AI summary

A string trimmer attachment assembly for a lawn mower includes a deck attachment mount; a turret mounted to the deck attachment mount about an axis; a trimmer head; a first arm mountable to the turret, the first arm adjustable along a first axis; a second arm mountable to the trimmer head, the second arm adjustable along a second axis; and a coupling to connect the first arm and the second arm such that the second arm is transverse to the first arm.