Cutting member of a saw chain, saw chain having a cutting member and files for filing a cutting tooth of a saw chain

Patent metadata

Field	Value
Publication number	US-10456946-B2
Application number	US-201815959103-A
Country	US
Kind code	B2
Filing date	Apr 20, 2018
Priority date	Apr 20, 2017
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A cutting member of a saw chain has a cutting tooth and a cutting surface having at least one cutting edge. In a side view, looking in a sharpening direction, a first line connects an intersection between an upper edge of a roof section and the cutting surface to an intersection between an imaginary line, which extends parallel to the upper edge, and the cutting surface. A second line connects an intersection between the upper edge and an imaginary displacement of the cutting surface parallel to the contact surface at a position in which a tooth tip of the cutting tooth lies perpendicular to the running direction above a longitudinal center axis of the rearward bearing point, to a point of intersection between the imaginary line and the imaginary displacement of the cutting surface. The contact surface is aligned such that the first and second line extend in parallel.

First claim

What is claimed is:

1. A cutting member of a saw chain, the cutting member comprising:
a cutting tooth;
the cutting member defining a running direction and having a forward bearing point disposed at a forward position with respect to the running direction and a rearward bearing point disposed at a rearward position with respect to the running direction;
a sharpened cutting surface at which at least one cutting edge is formed;
a planar contact surface adjoining said cutting surface;
said cutting tooth having a roof section at which one of said at least one cutting edges is formed;
said roof section, when viewed in a side view of the cutting member with a viewing direction in a sharpening direction which runs parallel to said cutting surface and parallel to said contact surface, having a greatest thickness (i) measured perpendicular to the running direction;
said roof section having an upper edge;
the cutting member defining a first connecting line in said side view connecting a first point of intersection between said upper edge of said roof section and said cutting surface to a point of intersection between an imaginary line, which extends parallel to and at a distance (k) from said upper edge of said roof section, and said cutting surface;
said cutting tooth having a tooth tip;
the cutting member defining a second connecting line in said side view connecting a second point of intersection between said upper edge of said roof section and an imaginary displacement of said cutting surface parallel to said contact surface at a position in which said tooth tip lies perpendicular to the running direction above a longitudinal center axis of the rear bearing point, to a third point of intersection between said imaginary line and said imaginary displacement of said cutting surface; and,
said contact surface being aligned such that said first connecting line and said second connecting line run parallel to each other.

2. The cutting member of claim 1 , wherein said distance (k) is at least 0.8 millimeters greater than said greatest thickness (i) of said roof section.

3. The cutting member of claim 1 , wherein said contact surface has a length (d) of at least 3 mm measured in the running direction.

4. The cutting member of claim 1 , wherein:
said sharpened cutting surface has a first cutting surface section and a second cutting surface section extending at an angle to said first cutting surface section;
said second cutting surface section is at least partially formed at said roof section; and,
said first cutting surface section and said second cutting surface section adjoin each other at a cutting surface edge.

5. The cutting member of claim 3 , wherein:
said forward bearing point and said rearward bearing point each define a respective longitudinal center axis;
said longitudinal center axes span a bearing point plane; and,
said contact surface and said bearing point plane conjointly enclose an angle of less than 5° in said side view.

6. The cutting member of claim 1 , wherein said at least one cutting edge extends in an arc-shaped manner.

7. The cutting member of claim 1 , wherein:
said at least one cutting edge extends in an arc-shaped manner with a radius (r) about a center point (M);
said contact surface and said center point (M) define a distance (u) between each other; and,
said distance (u) is less than said radius (r).

8. The cutting member of claim 6 , wherein said contact surface and said upper edge of said roof section conjointly enclose an angle of less than 5° in said side view.

9. The cutting member of claim 1 , wherein:
said forward bearing point and said rearward bearing point each define a respective longitudinal center axis; and,
said longitudinal center axis of said forward bearing point and said longitudinal center axis of said rearward bearing point conjointly define a bearing point plane.

10. The cutting member of claim 9 , wherein said first connecting line and said bearing point plane conjointly define an angle (ϵ) of less than 90° measured at a side facing away from said roof section.

11. The cutting member of claim 9 , wherein said contact surface and said bearing point plane conjointly define an angle of less than 5° in a viewing direction in the running direction.

12. The cutting member of claim 9 further comprising:
a depth delimiter arranged ahead of said cutting tooth with respect to the running direction;
the cutting member defining a cutout between said cutting tooth and said depth delimiter; and,
said cutout being at least partially delimited by said contact surface in a direction toward said bearing point plane.

13. A saw chain comprising:
a cutting member having a cutting tooth;
said cutting member defining a running direction and having a forward bearing point disposed at a forward position with respect to the running direction and a rearward bearing point disposed at a rearward position with respect to the running direction;
said cutting member having a sharpened cutting surface at which at least one cutting edge is formed;
said cutting member having a planar contact surface adjoining said cutting surface;
said cutting tooth having a roof section at which one of said at least one cutting edges is formed;
said roof section, when viewed in a side view of the cutting member with a viewing direction in a sharpening direction which runs parallel to said cutting surface and parallel to said contact surface, having a greatest thickness (i) measured perpendicular to the running direction;
said roof section having an upper edge;
said cutting member defining a first connecting line in said side view connecting a first point of intersection between said upper edge of said roof section and said cutting surface to a point of intersection between an imaginary line, which extends parallel to and at a distance (k) from said upper edge of said roof section, and said cutting surface;
said cutting tooth having a tooth tip;
said cutting member defining a second connecting line in said side view connecting a second point of intersection between said upper edge of said roof section and an imaginary displacement of said cutting surface parallel to said contact surface at a position in which said tooth tip lies perpendicular to the running direction above a longitudinal center axis of the rear bearing point, to a third point of intersection between said imaginary line and said imaginary displacement of said cutting surface;
said contact surface being aligned such that said first connecting line and said second connecting line run parallel to each other;
said forward bearing point and said rearward bearing point each defining a respective longitudinal center axis;
said longitudinal axis of said forward bearing point and said longitudinal axis of said rearward bearing point conjointly defining a bearing point plane;
said first connecting line and said bearing point plane conjointly defining an angle (ϵ) of less than 90° measured at a side facing away from said roof section;
a connecting member having an upper side and arranged adjacent to said cutting member;
said upper side of said connecting member and said bearing point plane defining a distance (f) between each other;
said contact surface and said bearing point plane defining a distance (g) between each other; and,
said distance (f) being smaller than said distance (g).

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Lux Thomas
• Hollmeier Friedrich

Classifications

• B27B33/142 Primary

  Cutter elements · CPC title

• B23D63/10

  by filing · CPC title

• B23D61/00

  Tools for sawing machines or sawing devices (tools for trepanning B23B51/04); Clamping devices for these tools · CPC title

• B23D57/02 Primary

  with chain saws · CPC title

• B23D63/162

  by a reciprocating or rotating rod-like sharpening tool, e.g. file, grinding cylinder · CPC title