Riding Mower Weed Whacker Linkage for Uneven Terrain Trimming

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Solution Overview

Problem

Current lawn care methods require separate operations for mowing and weed whacking, and existing solutions do not efficiently handle uneven terrain, leading to inefficiencies and reduced precision in cutting.

Innovation Solution

The EZ Wacker, a device that attaches to the front of a lawn mower, allows for simultaneous mowing and weed whacking with automatic adjustments to uneven terrain through multiple pivot points, maintaining a consistent trimmer cut diameter and enabling operator adjustments for cut angle, string length, speed, and width, while providing shock absorption for extended machine life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If separate operations are used for mowing and weed whacking, then each operation can be performed with dedicated equipment, but the overall lawn maintenance time increases and efficiency decreases

Engineering Contradiction:

Improvelawn maintenance efficiencyVSAvoidtime for separate mowing and weed whacking operations

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent combines the lawn mower and weed whacker into a single integrated system where the weed whacker is mounted on the front of the mower. This allows the operator to perform both mowing and weed whacking operations simultaneously in one pass, eliminating the need for separate operations and significantly improving productivity while reducing time loss.

Inventive Principle:

Principle #5Merging (Combining)

2Manufacturing precision

If a fixed-mounted weed whacker is used on the mower, then the structure is simple, but the device cannot accommodate uneven terrain and cut quality deteriorates

Engineering Contradiction:

Improvetrimming cut qualityVSAvoidability to handle uneven terrain

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent employs a pivot mechanism that allows the weed whacker assembly to rotate and adjust its angle relative to the mower deck. This dynamic adjustment capability enables the weed whacker to accommodate uneven terrain by naturally pivoting to maintain the correct cutting angle, thereby preserving cut quality while improving adaptability to varying ground conditions.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the weed whacker is mounted at the front of the mower, then the operator can maintain a natural posture with eyes forward, but the mounting structure becomes more complex

Engineering Contradiction:

Improveoperator posture and visibilityVSAvoidmounting structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent divides the mounting system into separate functional components: a pivot mechanism for angle adjustment, a suspension system with shock absorbers for impact absorption, and a mounting bracket assembly for attachment to the mower. This segmentation allows each component to perform its specific function while keeping the overall design manageable and maintainable, balancing operational comfort with structural complexity.

Inventive Principle:

Principle #1Segmentation

4Measurement precision

If manual adjustment of string length is required, then the mechanism is simple, but the operator effort increases and precision decreases

Engineering Contradiction:

Improvestring length control precisionVSAvoidoperator effort for adjustment

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent incorporates a motorized spool mechanism that automatically adjusts the string length based on terrain conditions and cutting requirements. The system uses sensors to detect ground level and automatically extends or retracts the string, eliminating the need for manual adjustment and providing precise control with minimal operator effort.

Inventive Principle:

Principle #25Self-service

5Reliability

If shock absorption features are added to the weed whacker, then the machine life is extended, but the device complexity increases

Engineering Contradiction:

Improvemachine life cycleVSAvoidshock absorption system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates shock absorbers into the mounting structure before impacts occur, providing pre-configured cushioning against terrain variations and obstacles. The shock absorbers are positioned to absorb impacts naturally during operation, protecting the weed whacker components from damage and extending machine life without requiring complex active protection systems.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11980128B1Weed whacker attachment for a riding lawn mower

Publication Date: 2024.05.14 DELAUTER DENNIS

AI summary

A weed whacker attaches to the front of a riding lawn mower. The week whacker is attached to the riding lawn mower through a pivoting linkage, and is supported on castors which may be adjustable in height. The weed whacker may thereby traverse uneven terrain which differs from the terrain traversed by the riding lawn mower, continuing to provide an even cut over the terrain. The weed whacker draws its power from the riding lawn mower. The weed whacker may be shifted between the right and left sides of the riding lawn mower. The weed whacker may be controlled by the driver of the riding lawn mower, including unwinding additional cutting wire in response to a control signal from a controller used by the driver of the riding lawn mower.