US 12,439,846 B2
String trimmer head
Beth E. Cholst, Wauwatosa, WI (US); and Troy C. Thorson, Cedarburg, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Apr. 18, 2022, as Appl. No. 17/723,146.
Claims priority of provisional application 63/241,200, filed on Sep. 7, 2021.
Claims priority of provisional application 63/213,410, filed on Jun. 22, 2021.
Claims priority of provisional application 63/176,636, filed on Apr. 19, 2021.
Prior Publication US 2022/0330479 A1, Oct. 20, 2022
Int. Cl. A01D 34/416 (2006.01)
CPC A01D 34/4168 (2013.01) [A01D 34/4165 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A trimmer head comprising:
a housing rotatable about a rotational axis, the housing including a main body defining a cavity, and a cap removably coupled to the main body;
a spool supported in the cavity and operable to support line to be dispensed; a retainer positioned between the housing and the spool;
a first wear ring protruding from a base wall at a distal end of the housing, the first wear ring protruding axially outward from the base wall and opposite of the cavity; and
a second wear ring protruding from the base wall the distal end of the housing, the second wear ring protruding axially outward from the base wall and opposite of the cavity, wherein the second wear ring is concentrically positioned relative to the first wear ring, and
wherein the first and second wear rings define one or more axial maxima from the base wall and prevent damage to the housing.