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US 12,213,403 B2Granted
String trimmer head and spool
AssigneeMilwaukee Electric Tool Corporation
InventorsBeth E. Cholst, Troy C. Thorson
Life of this patent
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Abstract
A spool and a trimmer head. The trimmer head includes a housing defining a cavity and rotatable about an axis. A spool is supported in the cavity and operable to support line to be dispensed. The spool is movable along the axis relative to the housing, and the spool and the housing define cooperating conical surfaces to center the spool during movement of the spool toward and in a position relative to the housing.
Claims9
A trimmer head comprising:
- a housing assembly including a housing portion at least partially defining a cavity, the housing assembly rotatable about an axis and including a retainer selectively coupled to the housing portion, the retainer defining a first conical surface;
- and
- a spool supported in the cavity and operable to support line to be dispensed, the spool being movable along the axis relative to the housing assembly, the spool defining a central portion and a second conical surface which extends continuously around the central portion, wherein the second conical surface cooperates with the first conical surface to center the spool during movement of the spool toward and in a position relative to the housing assembly;
- wherein:
- the retainer and the housing portion capture the spool, and
- the spool and the retainer define cooperating teeth configured to drivingly couple the spool with the retainer;
- and
- wherein the spool comprises:
- the central portion extending along the axis,
- a first flange proximate one end of the central portion,
- a second flange proximate an opposite end of the central portion, and
- an intermediate flange between the first flange and the second flange, the intermediate flange being in a flange plane, the flange plane being oriented non-perpendicular to the axis, wherein the second conical surface is positioned adjacent the second flange.
9 more elements
A trimmer head comprising:
- a housing assembly defining a cavity and rotatable about an axis, the housing assembly defining a first conical surface;
- and
- a spool supported in the cavity for movement along the axis relative to the housing, the spool including,
- a central portion,
- a first flange proximate one end of the central portion and positioned in a first plane,
- a second flange proximate an opposite end of the central portion and positioned in a second plane, parallel to the first plane,
- an intermediate flange extending around the central portion between the first flange and second flange, the intermediate flange being in a third plane oriented at an oblique angle relative to the first plane, and
- a second conical surface which cooperates with the first conical surface to center the spool during movement of the spool.
5 more elements
Dependencies are inferred from the claim text.