Tree Saw Attachment With Anvil Blade for Low-Power Ground Cutting

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Solution Overview

Problem

Existing tree felling apparatuses, such as chain saws and circular saws, are cumbersome, require high power, and pose hazards due to high speeds and debris, while shearing devices are inefficient for larger trees, necessitating a simpler, more portable, and safer solution for cutting trees at or below ground level with minimal power.

Innovation Solution

A tree saw attachment for a modular landscape trimmer featuring a drive unit with a transmission and a blade with an arcuate edge, where the blade moves transversely relative to an anvil upon rotation, utilizing a gear ratio to reduce motor speed and increase torque, allowing efficient cutting by a single user with minimal power requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If chain saws or circular saws are used for tree felling, then cutting capability is achieved, but device weight and bulk increase

Engineering Contradiction:

Improvedevice weightVSAvoidcutting capability

Core Design Contradiction:

Weight of moving objectVSProductivity

Solution Approach 1:

The patent replaces traditional high-speed rotating blade mechanics with a reciprocating linear motion system. A piston-driven blade moves back and forth in a straight line, eliminating the need for high-speed rotation while achieving effective cutting through concentrated force application at the blade tip.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts and eliminates unnecessary components from traditional saw systems. By removing the high-speed motor, transmission gears, and rotating blade assembly, the design achieves tree cutting capability with a simpler, lighter mechanism that uses only essential components: piston, cylinder, and reciprocating blade.

Inventive Principle:

Principle #2Taking out (Extraction)

2Speed

If high-speed rotating blades are used, then cutting speed is improved, but safety hazards from flying chips and debris increase

Engineering Contradiction:

Improvecutting speedVSAvoidflying chips and debris

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

Instead of rotating the blade at high speed to achieve cutting, the invention inverts the approach by moving the blade linearly at lower speed with high force. The cutting action is achieved through the reciprocating motion's mechanical advantage rather than rotational velocity, eliminating debris projection hazards.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The blade is designed as a simple, replaceable component that moves linearly rather than rotating. This simple blade design, combined with the reciprocating motion, creates a system where cutting force is concentrated and controlled, preventing the generation of flying chips and debris associated with high-speed rotation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Power

If shearing devices are used for large diameter trees, then cutting power is increased, but device complexity and leverage requirements increase

Engineering Contradiction:

Improvecutting powerVSAvoiddevice complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The piston accumulates mechanical energy through its power stroke before the blade engages the tree. This preliminary energy storage in the piston-cylinder system allows the blade to deliver concentrated cutting force without requiring complex transmission mechanisms or high leverage ratios.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the motion parameter from rotational speed to linear force. By using a piston-driven linear reciprocating motion, the system delivers high cutting power through force concentration at the blade tip rather than through high-speed rotation or mechanical leverage, simplifying the overall device structure.

Inventive Principle:

Principle #35Parameter changes

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

Enables efficient, safe, and low-power tree cutting at or below ground level, reducing the need for extensive power and user effort, while minimizing debris and stump profile, thus addressing the limitations of existing tree felling methods.

Implementation Method 1

utilizing a gear ratio to reduce motor speed and increase torque

Methodology Applied

Scientific EffectGear ratio: Gear

Data Source

PatentUS11647699B2Tree saw

Publication Date: 2023.05.16 DINOTOOTH CUTTER LLC

AI summary

A tree saw attachment for a modular landscape trimmer is disclosed. In one embodiment, the tree saw attachment is provided with a drive unit having a drive shaft operably connectable to a motive source and a transmission operably connected to the drive shaft. An anvil is connected to and extending from an output side of the transmission of the drive unit, and a blade is connected to the output shaft of the transmission. The blade has an arcuate outer peripheral edge with teeth formed along a portion thereof forming a cutting edge so as the output shaft is rotated, the distance between the cutting edge and a central axis of the output shaft increases until the blade has substantially completed one rotation. Rotation of the blade causes the blade to move transversely with respect to the anvil to engage and cut material positioned between the blade and the anvil.