Chainsaw chain and/or bar with coatings having specific properties

Patent metadata

Field	Value
Publication number	US-11014263-B2
Application number	US-201715784701-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Sep 6, 2016
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A cutting chain for a chainsaw may include a plurality of drive links, and a plurality of cutter links. Each of the drive links includes a top portion and a bottom portion that interfaces with a guide bar of the chainsaw. The cutter links are operably coupled to respective ones of the drive links at the top portion thereof. At least one of the cutter links includes a base portion and a cutting portion extending away from the base portion. The cutting portion includes a side plate and a top plate, the top plate including a top face and a bottom face. The side plate includes an outer face and an inside face. Multiple coating materials are provided on respective different surfaces of the drive links or cutter links such that different coating materials are applied based on a wear context of the respective different surfaces.

First claim

The invention claimed is:

1. A cutting chain for a chainsaw, the chain comprising:
a plurality of drive links, each of the drive links including a top portion and a bottom portion that interfaces with a guide bar of the chainsaw; and
a plurality of cutter links operably coupled to respective ones of the drive links at the top portion thereof,
wherein at least one of the cutter links comprises:
a cutting portion comprising a side plate and a top plate, the top plate including a top face and a bottom face, the side plate including an outer face and an inside face; and
a base portion comprising an upper portion adjacent the side plate, a middle portion, and a lower portion extending below apertures disposed in the at least one of the cutter links;
wherein a top face cutting portion coating having a hardness of greater than or equal to 1300 Hv is disposed on the top face of the top plate of the cutting portion of the at least one of the cutter links and a lower base portion coating, different than the top face cutting portion coating, having low friction properties is disposed on the lower portion of the base portion and extends in a direction toward the middle portion of the at least one of the cutter links.

2. The cutting chain of claim 1 , wherein the at least one of the cutter links further comprises a depth gauge portion on the upper portion of the base portion, wherein a depth gauge coating is disposed on the depth gauge portion.

3. The cutting chain of claim 1 , wherein an outer side plate coating is further provided on the outside face of the side plate.

4. The cutting chain of claim 1 , wherein an inside surface of the base portion slidably engages the drive link.

5. The cutting chain of claim 4 , wherein a top drive link coating is provided at the top portion of the drive link and a bottom drive link coating is provided at the bottom portion of the drive link.

6. The cutting chain of claim 1 , wherein a bottom face cutting portion coating is disposed on the bottom face of the top plate of the cutting portion.

7. A cutting chain for a chainsaw, the chain comprising:
a plurality of drive links, each of the drive links including a top portion and a bottom portion that interfaces with the guide bar of the chainsaw; and
a plurality of cutter links operably coupled to respective ones of the drive links at the top portion thereof,
wherein at least one of the cutter links comprises:
a cutting portion including a side plate and a top plate, the top plate including a top face and a bottom face, the side plate including an outer face and an inside face; and
a base portion comprising an upper portion adjacent the side plate, a middle portion, and a lower portion extending below apertures disposed in the at least one of the cutter links;
wherein a top face cutting portion coating having a hardness of greater than or equal to 1300 Hv is disposed on the top face of the top plate of the cutting portion of the at least one of the cutter links and a lower base portion coating, different than the top face cutting portion coating, having low friction properties is disposed on the lower portion of the base portion of the cutting portion of the at least one of the cutter links.

8. The cutting chain of claim 7 , wherein the at least one of the cutter links further comprises a depth gauge portion on the upper portion of the base portion, wherein a depth gauge coating is disposed on the depth gauge portion.

9. The cutting chain of claim 7 , wherein an outer side plate coating is further provided on the outside face of the side plate.

10. The cutting chain of claim 7 , wherein an inside surface of the base portion slidably engages the drive link.

11. The cutting chain of claim 10 , wherein a top drive link coating is provided at the top portion of the drive link and a bottom drive link coating is provided at the bottom portion of the drive link.

12. The cutting chain of claim 7 , wherein a bottom face cutting portion coating is disposed on the bottom face of the top plate of the cutting portion.

13. A cutting chain for a chainsaw, the chain comprising:
a plurality of drive links, each of the drive links including a top portion and a bottom portion that interfaces with a guide bar of the chainsaw; and
a plurality of cutter links operably coupled to respective ones of the drive links at the top portion thereof,
wherein at least one of the cutter links comprises:
a cutting portion comprising a side plate and a top plate, the top plate including a top face and a bottom face, the side plate including an outer face and an inside face; and
a base portion comprising an upper portion adjacent the side plate, a middle portion, and a lower portion extending below apertures disposed in the cutter link;
wherein a top face cutting portion coating having a hardness of greater than or equal to 1300 Hv is disposed on the top face of the top plate of the cutting portion of the at least one of the cutter links and an upper base portion coating, different than a top face cutting portion, having low friction properties is disposed on the upper portion of the base portion of the at least one of the cutter links.

Assignees

• Husqvarna Ab

Inventors

• Sarius Niklas
• Ståhlkrantz Adam

Classifications

• B27B33/14 Primary

  Saw chains {(saw chains for slotting or mortising devices B27F5/08)} · CPC title

• B27B17/02

  Chain saws equipped with guide bar (B27B17/06 takes precedence) · CPC title

• B27B33/142 Primary

  Cutter elements · CPC title

• B27B17/025

  Composite guide bars, e.g. laminated, multisectioned; Guide bars of diverse material · CPC title

• B27B17/12

  Lubricating devices specially designed for chain saws · CPC title