Trimmer line spool for a trimmer head

Patent metadata

Field	Value
Publication number	US-12290022-B2
Application number	US-202017106223-A
Country	US
Kind code	B2
Filing date	Nov 30, 2020
Priority date	Dec 4, 2019
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A trimmer line spool has first and second spool chambers for a trimmer line. First and second holder pairs are provided. The first holder pair has first and second trimmer line holders associated with the first spool chamber and the second spool chamber, respectively. The second holder pair has first and second trimmer line holders associated with the first spool chamber and the second spool chamber, respectively. The trimmer line holders of the first holder pair each have a first opening for the trimmer line. The trimmer line holders of the second holder pair each have a second opening for the trimmer line. A diameter of the first openings is larger than a diameter of the second openings. The first openings are positioned at an angle of 150° to 210° to each other. The second openings are positioned at an angle of 150° to 210° to each other.

First claim

What is claimed is:

1. A trimmer line spool for a trimmer head, the trimmer line spool comprising:
a first spool chamber and a second spool chamber, wherein the first spool chamber is configured to wind a free end of a first trimmer line therein in a winding direction about an axis of rotation of the trimmer line spool and wherein the second spool chamber is configured to wind a free end of a second trimmer line therein in the winding direction about the axis of rotation of the trimmer line spool, wherein, upon rotation of the trimmer line spool in an unwinding direction, the first trimmer line is unwound from the first spool chamber and the second trimmer line is unwound from the second spool chamber;
a first holder pair;
a second holder pair;
wherein the first holder pair comprises a first trimmer line holder associated with the first spool chamber and further comprises a second trimmer line holder associated with the second spool chamber;
wherein the second holder pair comprises a first trimmer line holder associated with the first spool chamber and further comprises a second trimmer line holder associated with the second spool chamber;
wherein the first trimmer line holder of the first holder pair and the first trimmer line holder of the second holder pair are arranged in the first spool chamber;
wherein the second trimmer line holder of the first holder pair and the second trimmer line holder of the second holder pair are arranged in the second spool chamber;
wherein the first and second trimmer line holders of the first holder pair each comprise a first opening for receiving the trimmer line;
wherein the first and second trimmer line holders of the second holder pair each comprise a second opening for receiving the trimmer line;
wherein a diameter of the first openings is larger than a diameter of the second openings;
wherein the first openings are positioned at an angle distance of 150° to 210° measured around the axis of rotation relative to each other;
wherein the second openings are positioned at an angle distance of 150° to 210° measured around the axis of rotation relative to each other;
a first spool wall, a second spool wall, and an intermediate wall positioned between the first spool wall and the second spool wall;
a circumferential wall, wherein the first spool wall, the second spool wall, and the intermediate wall are connected to each other by the circumferential wall, wherein the circumferential wall extends in a direction of the axis of rotation of the trimmer line spool;
wherein the first and second trimmer line holders of the first holder pair and the first and second trimmer line holders of the second holder pair are resting against the intermediate wall in the direction of the axis of rotation;
wherein the first trimmer line holder of the first holder pair and the second trimmer line holder of the second holder pair are positioned mirror-symmetrical to each other in relation to a mirror plane which is a radial plane of the intermediate wall.

2. The trimmer line spool according to claim 1 , wherein the first and second trimmer line holders at least of one of the first and second holder pairs are positioned at least partially in a longitudinal plane of the trimmer line spool containing the axis of rotation.

3. The trimmer line spool according to claim 1 , wherein the first and second trimmer line holders at least of one of the first and second holder pairs are comprised of identical trimmer line chambers.

4. The trimmer line spool according to claim 3 , wherein the trimmer line is insertable into the trimmer line chambers only through the first openings or the second openings, respectively.

5. The trimmer line spool according to claim 3 , wherein the trimmer line chambers are closed at a side opposite the first opening or the second opening, respectively, and the side that is closed forms a stop for the trimmer line.

6. The trimmer line spool according to claim 3 , wherein the trimmer line spool comprises a rotational direction, wherein the rotational direction is the winding direction, and wherein the first openings of the first and second trimmer line holders of the first holder pair are formed at a leading side of the trimmer line chambers, wherein the leading side is leading when viewed in the rotational direction.

7. The trimmer line spool according to claim 3 , wherein the trimmer line spool comprises a rotational direction, wherein the rotational direction is the winding direction, and wherein the second openings of the first and second trimmer line holders of the second holder pair are formed at a leading side of the trimmer line chambers, wherein the leading side is leading when viewed in the rotational direction.

8. The trimmer line spool according to claim 1 , wherein the diameter of the second openings amounts to at most 90% of the diameter of the first openings.

9. The trimmer line spool according to claim 1 ,
further comprising a contour structure for an indexing device arranged at an end face of the trimmer line spool.

10. The trimmer line spool according to claim 1 , wherein the trimmer line spool comprises at least one continuous trimmer line channel configured to allow the trimmer line to be pushed therethrough and wound onto the trimmer line spool.

11. The trimmer line spool according to claim 10 , wherein the at least one continuous trimmer line channel comprises an inlet opening and an outlet opening, wherein the inlet opening and the outlet opening, viewed in a circumferential direction of the trimmer line spool, are arranged centrally between the first and the second trimmer line holders of one of the first and second holder pairs.

12. The trimmer line spool according to claim 11 , wherein the inlet opening and the outlet opening of the at least one continuous trimmer line channel are arranged in an intermediate wall of the trimmer line spool.

13. The trimmer line spool according to claim 1 ,
wherein the first spool chamber is delimited by the first spool wall and the intermediate wall in an axial direction along the axis of rotation, and wherein the second spool chamber is delimited by the intermediate wall and the second spool wall in the axial direction along the axis of rotation;
wherein the first trimmer line holder of the first holder pair is arranged in the first spool chamber above the intermediate wall, and wherein the second trimmer line holder of the first holder pair is arranged in the second spool chamber below the intermediate wall;
wherein the first trimmer line holder of the second holder pair is arranged in the first spool chamber above the intermediate wall, and wherein the second trimmer line holder of the second holder pair is arranged in the second spool chamber below the intermediate wall;
wherein the first opening of the first trimmer line holder of the first holder pair is arranged in the first spool chamber and extends exclusively above the intermediate wall, and wherein the first opening of the second trimmer line holder of the first holder pair is arranged in the second spool chamber and extends exclusively below the intermediate wall;
wherein the second opening of the first trimmer line holder of the second holder pair is arranged in the first spool chamber and extends exclusively above the intermediate wall, and wherein the second opening of the second trimmer line holder of the second holder pair is arranged in the second spool chamber and extends exclusively below the intermediate wall;
wherein the first openings and the second openings are spaced apart from the intermediate wall.

14. The trimmer line spool according to claim 1 ,
wherein the c

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Schmidt Sebastian
• Haug Simon
• Zappe Sebastian
• Brenner Christoph
• Rethaber Achim
• Petersen Björn
• Buchner Stefan

Classifications

• A01D34/4168 Primary

  Constructional details of the flexible lines · CPC title

• A01D34/4165

  Mounting of the cutter head · CPC title

• A01D34/4163

  by triggered line feedout, e.g. bump-feeding · CPC title

• A01D34/4166 Primary

  Mounting or replacement of the lines · CPC title

• A01D34/416 Primary

  Flexible line cutters · CPC title