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US 12,439,846 B2Granted
String trimmer head
AssigneeMilwaukee Electric Tool Corporation
InventorsBeth E. Cholst, Troy C. Thorson
Life of this patent
Estimating the term…
Abstract
A trimmer head includes a housing rotatable about a rotational axis. The housing includes a main body defining a cavity, and a cap removably coupled to the main body. The trimmer head additionally includes a spool supported in the cavity and operable to support line to be dispensed, a retainer positioned between the housing and the spool. and a first ring protruding from a distal end of the housing.
Claims10
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.
4 more elements
A trimmer head for use with a string trimmer including a drive shaft, the trimmer head comprising:
- a housing rotatable about a rotational axis, the housing including
- a main body defining a cavity, wherein the main body includes a sidewall, a base wall, and a chamfered edge extending between the sidewall and the base wall, and
- a cap removably coupled to the main body;
- a spool supported in the cavity and operable to support line to be dispensed, wherein the spool is drivingly coupled to the drive shaft;
- a retainer positioned between the housing and the spool;
- a first wear ring protruding from the base wall of the main body, 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 of the main body, the second wear ring protruding from the base wall axially outward 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.
6 more elements
Dependencies are inferred from the claim text.