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US 11,889,794 B2Granted
Handheld blower
AssigneeMilwaukee Electric Tool Corporation
InventorsBeth E. Cholst, Bennett W. Westling, Atul Anand, Gregory A. Mutchler
Life of this patent
Estimating the term…
Abstract
A handheld blower including a housing, an air duct defining a duct axis, the air duct including an air inlet and an air outlet opposite the air inlet, and a handle. The handle at least partially defining a battery receiving cavity configured to receive at least a portion of a battery pack therein, where the handle defines a grip axis, and where the grip axis is parallel to the duct axis.
Claims23
A handheld blower comprising:
- a housing;
- an air duct including an air inlet and an air outlet opposite the air inlet, the air duct defining a duct axis;
- a fan disposed in the air duct between the air inlet and the air outlet, the fan configured to rotate about the duct axis;
- a cover disposed in the air duct between the fan and the air outlet, the cover having a first length extending along the axis;
- and
- a flow region disposed radially between the cover and an inner surface of the air duct, the flow region including an annular cross-sectional area that is constant along a majority of the first length,
- wherein the fan includes a fan hub and a plurality of fan blades extending radially outwardly from the fan hub, each fan blade including an upstream connection point to the fan hub;
- and
- wherein the air duct includes an air duct intake length extending axially between the air inlet and the upstream connection point, wherein the air duct includes an air duct radius between an inner surface of the air duct and the duct axis at a position between the air inlet and the upstream connection point, and wherein a ratio of the air duct radius to the air duct intake length is between 0.4 and 0.55.
6 more elements
A handheld blower comprising:
- a housing;
- an air duct including an air inlet and an air outlet opposite the air inlet, the air duct defining a duct axis;
- a fan disposed in the air duct between the air inlet and the air outlet, the fan configured to rotate about the duct axis;
- a cover disposed in the air duct between the fan and the air outlet, the cover having a first length extending along the axis;
- and
- a flow region disposed radially between the cover and an inner surface of the air duct, the flow region including an annular cross-sectional area that is constant along a majority of the first length,
- wherein the fan includes a fan hub and a plurality of fan blades extending radially outwardly from the fan hub to include a fan tip, the fan defining a first radius extending between the duct axis and the radial exterior of the fan hub, the fan also defining a second radius extending between the duct axis and the blade tip of a fan blade;
- and
- wherein a ratio of a first radius and the second radius is between 0.6 and 0.8.
6 more elements
Dependencies are inferred from the claim text.