Chainsaw Cutting Link Sharpness Profile for Protective Garment Safety

Solution Overview

Problem

Existing chainsaws pose a safety risk as new saw chains can cut through protective workwear, potentially injuring the user due to the uniform sharpness of cutting edges, which wear unevenly and increase the likelihood of cutting through protective garments.

Innovation Solution

A chainsaw cutting link design with a top plate cutting edge sharper than the side plate cutting edge, featuring a concave portion on the side plate to prevent cutting through protective wear, and a method of manufacturing and grinding the cutting link to ensure the side plate edge is less sharp in specific areas, reducing the risk of cutting through protective garments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the top plate cutting edge and side plate cutting edge have the same sharpness, then the cutting ability is maximized, but the risk of cutting through protective workwear increases

Engineering Contradiction:

Improvecutting abilityVSAvoidrisk of cutting through protective workwear

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating different sharpness levels at different locations on the cutting tooth. The top plate cutting edge is sharpened to a first sharpness level for effective cutting, while the side plate cutting edge is sharpened to a second sharpness level that is less sharp than the first level. This localized differentiation allows the cutting tooth to maintain cutting effectiveness while reducing the ability to cut through protective workwear fibers.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the side plate cutting edge is made less sharp, then the ability to cut through protective garments is reduced, but the ability to cut through material fibers may be compromised

Engineering Contradiction:

Improveability to cut through protective garmentsVSAvoidability to cut through material fibers

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies local quality by creating different sharpness levels at different locations on the cutting tooth. The top plate cutting edge is sharpened to a first sharpness level for effective cutting, while the side plate cutting edge is sharpened to a second sharpness level that is less sharp than the first level. This localized differentiation allows the cutting tooth to maintain cutting effectiveness while reducing the ability to cut through protective workwear fibers.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If both cutting edges are sharpened uniformly, then manufacturing simplicity is maintained, but uneven wear leads to increased safety risk over time

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidsafety risk from uneven wear

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by creating different sharpness levels at different locations on the cutting tooth. The top plate cutting edge is sharpened to a first sharpness level for effective cutting, while the side plate cutting edge is sharpened to a second sharpness level that is less sharp than the first level. This localized differentiation allows the cutting tooth to maintain cutting effectiveness while reducing the ability to cut through protective workwear fibers.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12365040B2Chainsaw 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: 2025.07.22 HUSQVARNA AB

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).