US 12,290,022 B2
Trimmer line spool for a trimmer head
Sebastian Schmidt, Kirchheim a. N. (DE); Simon Haug, Waiblingen (DE); Sebastian Zappe, Kirchberg an der Murr (DE); Christoph Brenner, Gärtringen (DE); Achim Rethaber, Fellbach (DE); Björn Petersen, Großbottwar (DE); and Stefan Buchner, Nesselwang (DE)
Assigned to Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed by Andreas Stihl AG & Co. KG, Waiblingen (DE)
Filed on Nov. 30, 2020, as Appl. No. 17/106,223.
Claims priority of application No. 19213583 (EP), filed on Dec. 4, 2019.
Prior Publication US 2021/0168997 A1, Jun. 10, 2021
Int. Cl. A01D 34/416 (2006.01)
CPC A01D 34/4166 (2013.01) [A01D 34/4163 (2013.01); A01D 34/4165 (2013.01); A01D 34/4168 (2013.01)] 15 Claims
OG exemplary drawing
 
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.