Patent ID: 11889794
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC A  F | IPC A  F

Claim 10:
11. 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.