Chainsaw Cutting Link With Differential Edge Sharpness for Protective Wear

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Solution Overview

Problem

Existing chainsaws pose a safety risk as new chainsaws can easily cut through protective workwear due to uniform sharpness of cutting edges, leading to potential injury.

Innovation Solution

A chainsaw cutting link with a cutting tooth design featuring a top plate edge and a side plate edge, where the side plate edge has a less sharp trailing portion to prevent cutting through protective wear, while maintaining cutting efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the cutting edges are made uniformly sharp to maintain good cutting ability, then the cutting efficiency is improved, but the safety risk increases as the chain can cut through protective workwear

Engineering Contradiction:

Improvecutting efficiencyVSAvoidsafety risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The cutting tooth is designed with non-uniform sharpness distribution: the top plate cutting edge maintains high sharpness for efficient cutting, while the side plate cutting edge has reduced sharpness to prevent cutting through protective workwear. This local differentiation of cutting edge properties resolves the contradiction between cutting efficiency and safety.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the top plate cutting edge is made sharper than the side plate cutting edge, then the safety is improved by preventing chain penetration of protective wear, but the manufacturing precision requirement increases due to differential sharpening

Engineering Contradiction:

ImprovesafetyVSAvoiddifferential sharpness control

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The cutting tooth is segmented into two functional zones: the top plate cutting edge for primary cutting action and the side plate cutting edge for secondary fiber cutting. This segmentation allows independent optimization of sharpness for each zone, with the top plate edge being sharper than the side plate edge, achieving both safety and manufacturing feasibility.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If the side plate cutting edge is made less sharp to engage with filaments and stop the chain, then the safety is improved, but the cutting ability through material is reduced

Engineering Contradiction:

ImprovesafetyVSAvoidcutting ability

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The side plate cutting edge is designed with partial sharpness - not completely dull but deliberately less sharp than the top plate edge. This partial sharpness is sufficient to engage and cut wood fibers for clean cutting while being dull enough to prevent cutting through protective workwear filaments, achieving the desired safety effect without excessive loss of cutting ability.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP3959053B1Chainsaw cutting link, a saw chain comprising such a cutting link, a method for manufacturing of a cutting link, and a method of grinding a cutting link

Publication Date: 2026.01.14 HUSQVARNA AB

Figure 1A~2
Figure 3A
Figure 3B

AI summary

A chainsaw cutting link (21) comprises: a base portion (29) provided with two rivets holes (20a, 20b) for pivotal inter- connection with adjacent links (13), and a cutting tooth (35) extending away from the base portion (29), wherein the cutting tooth (35) comprises a top plate (41) and a side plate (43) defining an angle to form an L-shaped cutting edge (45, 47, 49) facing in a cutting direction (B). The top plate (41) comprises a top plate cutting edge (45) which is sharper than at least a portion (53) of the side plate cutting edge (47).