Handheld blower

Patent metadata

Field	Value
Publication number	US-12426552-B2
Application number	US-202318401134-A
Country	US
Kind code	B2
Filing date	Dec 29, 2023
Priority date	Dec 30, 2020
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

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.

First claim

What is claimed is:

1. A handheld blower comprising:
a housing;
an air duct defining a duct axis, the air duct including an air inlet and an air outlet opposite the air inlet;
a fan disposed in the air duct between the air inlet and the air outlet, the fan configured to rotate about the duct axis, the fan including a fan hub and a plurality of fan blades, each of the plurality of fan blades extending radially outwardly from the fan hub to include a blade tip, the fan defining a first radius extending between the duct axis and a 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 of the plurality of fan blades, each fan blade includes an upstream connection point at which the fan blade is connected to the fan hub; and
wherein a ratio of the first radius and the second radius is between 0.6 and 0.8, 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.

2. The handheld blower of claim 1 , further comprising a handle at least partially defining a battery receiving cavity configured to receive at least a portion of a battery pack therein, wherein the handle defines a grip axis, and wherein the grip axis is parallel to the duct axis±10 degrees.

3. The handheld blower of claim 2 , further comprising the battery pack, and wherein when the portion of the battery pack is received in the battery receiving cavity, a plane aligned with the air inlet and oriented normal to the duct axis passes through the battery pack.

4. The handheld blower of claim 3 , wherein when received in the battery receiving cavity, at least a portion of the battery pack is disposed outside of the battery receiving cavity.

5. The handheld blower of claim 2 , wherein at least a portion of the handle is axially aligned with the fan.

6. The handheld blower of claim 2 , wherein the battery receiving cavity defines an insertion axis, and wherein the insertion axis is parallel to the grip axis±10 degrees.

7. The handheld blower of claim 1 , wherein the ratio of the first radius and the second radius is between 0.65 and 0.75.

8. The handheld blower of claim 1 , wherein the ratio of the first radius and the second radius is between 0.7 and 0.75.

9. The handheld blower of claim 1 , wherein the ratio of the first radius and the second radius is 0.72.

10. The handheld blower of claim 1 , wherein the fan hub includes a curvilinear upstream surface facing the air inlet, and wherein the upstream surface is shaped such that the fan hub increases in cross-sectional area as it extends downstream.

11. The handheld blower of claim 1 , wherein the plurality of fan blades includes thirteen fan blades spaced equally about the circumference of the fan hub.

12. The handheld blower of claim 1 , wherein the ratio of the air duct radius to the air duct intake length is between 0.45 and 0.5.

13. The handheld blower of claim 1 , wherein the ratio of the air duct radius to the air duct intake length is 0.5.

14. The handheld blower of claim 1 , wherein the air duct further includes a bell shape section extending along at least a portion of the air duct intake length, and wherein the bell shape defines a maximum duct radius and a minimum duct radius, and wherein the ratio of the minimum duct radius and the air duct intake length is between 0.4 and 0.55.

15. The handheld blower of claim 14 , wherein the air duct further includes a cylindrical section extending along at least a portion of the air duct intake length, and wherein at least a portion of the cylindrical section is disposed between the bell shape section and the fan.

16. The handheld blower of claim 15 , wherein
the bell shape section includes a maximum bell radius,
the cylindrical section includes a cylinder radius, and
a ratio of the cylinder radius and the maximum bell radius is between 0.6 and 0.73.

17. The handheld blower of claim 16 , wherein the ratio of the cylinder radius and the maximum bell radius is between 0.63 and 0.7.

18. The handheld blower of claim 16 , wherein the ratio of the cylinder radius and the maximum bell radius is 0.67.

19. The handheld blower of claim 15 , wherein a portion of the cylindrical section is disposed radially outwardly from the fan.

20. The handheld blower of claim 15 , wherein
a portion of the cylindrical section includes openings defined therein, and
a sound dampening material layer is disposed between the housing and the air duct, the sound dampening material layer covering the openings.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Cholst Beth E
• Westling Bennett W
• Anand Atul
• Mutchler Gregory A

Classifications

• F04D19/002

  Axial flow fans · CPC title

• F04D25/084

  hand fans · CPC title

• F04D25/0673

  Battery powered · CPC title

• F04D29/703

  specially for fans, e.g. fan guards · CPC title

• F04D29/545

  Ducts · CPC title