IP Library › Granted Patent US 12,426,552
Granted Patent B2
US 12,426,552 · App. 18/401,134 · Granted Sep 30, 2025

Handheld blower

Inventors: Beth E. Cholst (Wauwatosa, WI); Bennett W. Westling (Milwaukee, WI); Atul Anand (Milwaukee, WI); Gregory A Mutchler (Milwaukee, WI)
Assignee: Milwaukee Electric Tool Corporation
A01G20/47F04D19/002F04D25/0673F04D25/084F04D29/545F04D29/703
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Quick Facts
Patent No.
US 12,426,552
App. No.
18/401,134
Granted
Sep 30, 2025
Kind
B2
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.

Claims (29)

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.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 2, 2024
From: CHOLST, BETH E.; WESTLING, BENNETT W.; ANAND, ATUL; MUTCHLER, GREGORY A.
To: MILWAUKEE ELECTRIC TOOL CORPORATION
Reel/Frame 065992/0975 →
Continuity (4)
Division 17566420 · Dec 30, 2021
Provisional Application 63287430 · Dec 8, 2021
Provisional Application 63131878 · Dec 30, 2020
Related Publication 20240130307A1 · Apr 25, 2024
References Cited (220)
US 1898410A · Wales · 1933 [cited by applicant]
US 2284586A · McDermott · 1942 [cited by applicant]
US 2294586A · Troller · 1942 [cited by applicant]
US 2768782A · Tateishi · 1956 [cited by applicant]
US 2938527A · Nichols · 1960 [cited by applicant]
US 3346174A · Lievens et al. · 1967 [cited by applicant]
US 3407431A · Melnik · 1968 [cited by applicant]
US 3540547A · Coward, Jr. · 1970 [cited by applicant]
US 4185688A · Wiater et al. · 1980 [cited by applicant]
US 4222318A · Patton et al. · 1980 [cited by applicant]
US 4413371A · Tuggle et al. · 1983 [cited by applicant]
US 4615069A · Henning · 1986 [cited by applicant]
US 4692091A · Ritenour · 1987 [cited by applicant]
US 4696450A · Huang · 1987 [cited by applicant]
US 4734017A · Levin · 1988 [cited by applicant]
US 4792286A · Gassen · 1988 [cited by applicant]
US 4794225A · Maese · 1988 [cited by applicant]
US 4821366A · Levine · 1989 [cited by applicant]
US 4838151A · Shin-Chin · 1989 [cited by applicant]
US 4884314A · Miner et al. · 1989 [cited by applicant]
US 4981414A · Sheets · 1991 [cited by applicant]
US 5035586A · Sadler et al. · 1991 [cited by applicant]
US 5269665A · Sadler et al. · 1993 [cited by applicant]
US 5560076A · Leung · 1996 [cited by applicant]
US 5701631A · Lindquist · 1997 [cited by applicant]
US 5821473A · Takahashi · 1998 [cited by applicant]
US 5938527A · Oshima et al. · 1999 [cited by applicant]
US 5975862A · Arahara et al. · 1999 [cited by applicant]
US 5979013A · Beckey et al. · 1999 [cited by applicant]
US 6105206A · Tokumaru et al. · 2000 [cited by applicant]
US 6158082A · Beckey et al. · 2000 [cited by applicant]
US 6244823B1 · Marino et al. · 2001 [cited by applicant]
US 6305048B1 · Salisian · 2001 [cited by applicant]
US 6324720B1 · Beckey et al. · 2001 [cited by applicant]
US 6324721B2 · Doragrip · 2001 [cited by applicant]
US 6370729B2 · Miyamoto · 2002 [cited by applicant]
US 6468053B2 · Wolpert · 2002 [cited by applicant]
US 6514036B2 · Marshall et al. · 2003 [cited by applicant]
US 6575695B1 · Miyamoto · 2003 [cited by applicant]
US 6857163B2 · Iida et al. · 2005 [cited by applicant]
US 7055213B2 · Iida et al. · 2006 [cited by applicant]
US 7300484B2 · Scully et al. · 2007 [cited by applicant]
US 7735188B2 · Shaffer · 2010 [cited by applicant]
US 7774896B2 · Andresen et al. · 2010 [cited by applicant]
US 7845048B1 · Bailey et al. · 2010 [cited by applicant]
US 7850513B1 · Parker et al. · 2010 [cited by applicant]
US 7941894B1 · Skorput · 2011 [cited by applicant]
US 8449589B1 · Harsy · 2013 [cited by applicant]
US 8510910B1 · Ramsey · 2013 [cited by applicant]
US 8745815B2 · Takano et al. · 2014 [cited by applicant]
US 8894382B2 · Binder · 2014 [cited by applicant]
US 8918956B2 · Pellenc · 2014 [cited by applicant]
US 8967949B2 · Gamissans Bou · 2015 [cited by applicant]
US 9004854B2 · Nakazawa · 2015 [cited by applicant]
US 9167751B2 · Thackery et al. · 2015 [cited by applicant]
US 9364125B2 · Takahashi · 2016 [cited by applicant]
US 9439548B2 · Jenson · 2016 [cited by applicant]
US 9538711B2 · Mutoh et al. · 2017 [cited by applicant]
US 9603497B2 · Yamaoka et al. · 2017 [cited by applicant]
US 9737182B2 · Gindele et al. · 2017 [cited by applicant]
US 9869327B2 · Kodato et al. · 2018 [cited by applicant]
US D812825S · Smith et al. · 2018 [cited by applicant]
US 9970445B2 · Kodato et al. · 2018 [cited by applicant]
US 9974241B2 · Yamaoka et al. · 2018 [cited by applicant]
US 10000900B2 · Yamaoka et al. · 2018 [cited by applicant]
US 10065219B2 · Suzuki et al. · 2018 [cited by applicant]
US 10091954B1 · Yamaoka et al. · 2018 [cited by applicant]
US 10227988B2 · Gao · 2019 [cited by examiner]
US 10232502B2 · Bylund et al. · 2019 [cited by applicant]
US 10264739B2 · Yamakoa et al. · 2019 [cited by applicant]
US 10306843B2 · Thackery et al. · 2019 [cited by applicant]
US D853061S · Dretzka et al. · 2019 [cited by applicant]
US D854265S · Wachter et al. · 2019 [cited by applicant]
US 10337526B2 · Shao et al. · 2019 [cited by applicant]
US 10398095B2 · Gao · 2019 [cited by examiner]
US 10405707B2 · Zhu et al. · 2019 [cited by applicant]
US 10487850B2 · Shao et al. · 2019 [cited by applicant]
US 10670048B2 · Landen et al. · 2020 [cited by applicant]
US 10774487B2 · Yamaoka et al. · 2020 [cited by applicant]
US 10947983B2 · Hoffman · 2021 [cited by examiner]
US 11333172B1 · Tzeng · 2022 [cited by examiner]
US D970832S · Shao · 2022 [cited by applicant]
US D1008581S · Xu et al. · 2023 [cited by applicant]
US D1035191S · Chen · 2024 [cited by applicant]
US 20020060107A1 · Kamoshita et al. · 2002 [cited by applicant]
US 20030033689A1 · Marshall et al. · 2003 [cited by applicant]
US 20040159109A1 · Harvie · 2004 [cited by applicant]
US 20070294855A1 · Iida et al. · 2007 [cited by applicant]
US 20080098703A1 · Lucas et al. · 2008 [cited by applicant]
US 20090038108A1 · Shaanan et al. · 2009 [cited by applicant]
US 20090180902A1 · Tung et al. · 2009 [cited by applicant]
US 20090241285A1 · Hinklin et al. · 2009 [cited by applicant]
US 20100003149A1 · Nelson · 2010 [cited by applicant]
US 20100192314A1 · Otsuka et al. · 2010 [cited by applicant]
US 20100247316A1 · Aynsley et al. · 2010 [cited by applicant]
US 20110146023A1 · Wada et al. · 2011 [cited by applicant]
US 20120093490A1 · Steinberg · 2012 [cited by applicant]
US 20120096672A1 · Hatano et al. · 2012 [cited by applicant]
US 20120138058A1 · Fu et al. · 2012 [cited by applicant]
US 20130183141A1 · Tan · 2013 [cited by applicant]
US 20140056738A1 · Takahashi · 2014 [cited by applicant]
US 20140086728A1 · Engert et al. · 2014 [cited by applicant]
US 20140140861A1 · Pellenc · 2014 [cited by applicant]
US 20150282356A1 · Takahashi et al. · 2015 [cited by applicant]
US 20150377253A1 · Shibata et al. · 2015 [cited by applicant]
US 20160157686A1 · Bermudez et al. · 2016 [cited by applicant]
US 20160169249A1 · Takahashi et al. · 2016 [cited by applicant]
US 20160195097A1 · Patrick · 2016 [cited by applicant]
US 20160216249A1 · Sass · 2016 [cited by applicant]
US 20160265540A1 · Tirone et al. · 2016 [cited by applicant]
US 20160298635A1 · Su et al. · 2016 [cited by applicant]
US 20160305438A1 · Yamamoto et al. · 2016 [cited by applicant]
US 20160324380A1 · Sergyeyenko et al. · 2016 [cited by applicant]
US 20170045246A1 · Kaleta et al. · 2017 [cited by applicant]
US 20170208748A1 · Yamaoka et al. · 2017 [cited by applicant]
US 20180000014A1 · Yamaoka et al. · 2018 [cited by applicant]
US 20180094393A1 · Takahashi et al. · 2018 [cited by applicant]
US 20180146628A1 · Huo et al. · 2018 [cited by applicant]
US 20180146682A1 · Beau et al. · 2018 [cited by applicant]
US 20180209429A1 · Ishida · 2018 [cited by applicant]
US 20190021243A1 · Naka et al. · 2019 [cited by applicant]
US 20190098844A1 · Yang et al. · 2019 [cited by applicant]
US 20190191638A1 · Yamaoka et al. · 2019 [cited by applicant]
US 20190353171A1 · Hoffman · 2019 [cited by applicant]
US 20200096006A1 · Shao et al. · 2020 [cited by applicant]
US 20200137966A1 · Suzuki et al. · 2020 [cited by applicant]
US 20200352132A1 · Johnson et al. · 2020 [cited by applicant]
US 20210033115A1 · Hoffman et al. · 2021 [cited by applicant]
US 20220183241A1 · Liu et al. · 2022 [cited by applicant]
US 20220201946A1 · Cholst et al. · 2022 [cited by applicant]
US 20220213903A1 · Sakuragi et al. · 2022 [cited by applicant]
US 20220412364A1 · Takano et al. · 2022 [cited by applicant]
CN 2053083U · 1990 [cited by applicant]
CN 2580819Y · 2003 [cited by applicant]
CN 101135139B · 2011 [cited by applicant]
CN 201968600U · 2011 [cited by applicant]
CN 202015678U · 2011 [cited by applicant]
CN 202157288U · 2012 [cited by applicant]
CN 203270492U · 2013 [cited by applicant]
CN 103671175A · 2014 [cited by applicant]
CN 203498784U · 2014 [cited by applicant]
CN 104074155A · 2014 [cited by applicant]
CN 204126922U · 2015 [cited by applicant]
CN 104564839A · 2015 [cited by applicant]
CN 102296555B · 2015 [cited by applicant]
CN 204722966U · 2015 [cited by applicant]
CN 105248156A · 2016 [cited by applicant]
CN 205999837U · 2017 [cited by applicant]
CN 206090426U · 2017 [cited by applicant]
CN 206289575U · 2017 [cited by applicant]
CN 107269550A · 2017 [cited by applicant]
CN 206815252U · 2017 [cited by applicant]
CN 106284153B · 2018 [cited by applicant]
CN 106284148B · 2018 [cited by applicant]
CN 106284149B · 2018 [cited by applicant]
CN 207498881U · 2018 [cited by applicant]
CN 207582389U · 2018 [cited by applicant]
CN 107201734B · 2018 [cited by applicant]
CN 108476871A · 2018 [cited by applicant]
DE 29921751U1 · 2000 [cited by applicant]
DE 19523339C2 · 2001 [cited by applicant]
DE 102007037011A1 · 2008 [cited by applicant]
DE 102010054841A1 · 2012 [cited by applicant]
DE 202017106572U1 · 2018 [cited by applicant]
EP 3133973B1 · 2018 [cited by applicant]
FR 2224713A1 · 1974 [cited by applicant]
FR 2840172A1 · 2003 [cited by applicant]
GB 2156962A · 1985 [cited by applicant]
GB 2390118A · 2003 [cited by applicant]
GB 6303830 · 2023 [cited by applicant]
JP H0214790A · 1990 [cited by applicant]
JP 2749885B2 · 1998 [cited by applicant]
JP 2000018720A · 2000 [cited by applicant]
JP 2009264300A · 2009 [cited by applicant]
JP 2014037818A · 2014 [cited by applicant]
JP 2014148950A · 2014 [cited by applicant]
JP 2020193580A · 2020 [cited by applicant]
WO WO8904135A1 · 1989 [cited by applicant]
WO WO2012136906A2 · 2012 [cited by applicant]
WO WO2012140825A1 · 2012 [cited by applicant]
WO WO2016044268A1 · 2016 [cited by applicant]
WO WO2018028639A1 · 2018 [cited by applicant]
WO WO2018164145A1 · 2018 [cited by applicant]
WO WO2019062279A1 · 2019 [cited by applicant]
WO WO2019206581A1 · 2019 [cited by applicant]
Black & Decker, “Heat Gun Instruction Manual,” Catalog No. HG1300, Nov. 2010 (32 pages). [cited by applicant]
Black & Decker, “20V Max* Lithium Sweeper” Instruction Manual, Model No. LSW20, Nov. 2011 (32 pages). [cited by applicant]
Black & Decker, “36V Lithium Hard Surface Sweeper Vac Instruction Manual,” Model No. LSWV36, Jun. 2012 (44 pages). [cited by applicant]
Black & Decker, “Cordless Broom Instruction Manual,” Catalog Nos. NS118, NS118L, Jun. 2011 (6 pages). [cited by applicant]
Black & Decker, “Instruction Manual,” Catalog No. BV2500, BV9000, May 2004 (4 pages). [cited by applicant]
Black & Decker, “Straight Tube Blower / Sweeper,” Instruction Manual, Catalog No. BL950, Aug. 2003 (3 pages). [cited by applicant]
Black & Decker, “Sweeper,” Instruction Manual, Catalog No. CS100, © 2003 (4 pages). [cited by applicant]
DeWalt, “D26950, D26960 Heavy-Duty Heat Gun,” Instruction Manual, Aug. 2009 (7 pages). [cited by applicant]
E Magazine, “Blow, Leaves, Blow,” Sep./Oct. 2012, p. 36. [cited by applicant]
Greenworks, “24V Lithium-Ion Cordless Blower 24352,” Owner's Manual, Apr. 24, 2014 (18 pages). [cited by applicant]
Greenworks, “40V Brushless Blower/Vac 24322,” Owner's Manual, Jul. 25, 2013 (13 pages). [cited by applicant]
Greenworks, “40V Lithium-ion Cordless Blower 24212,” Owner's Manual, Dec. 24, 2012 (20 pages). [cited by applicant]
Greenworks, “40V Lithium-Ion Cordless Blower 24252,” Owner's Manual, Jan. 15, 2013 (20 pages). [cited by applicant]
Kobalt Tools, “Kobalt 40-Volt Max* Blower,” <https://web.archive.org/web/20150509211919/http://kobalttools.com:80/ . . . > web page publicly available at least as early as May 2015. [cited by applicant]
Leister, “Hot Air Blower Hotwind Premium Hotwind System,” Brochure, May 2011 (4 pages). [cited by applicant]
Machine Design, “Leaf Removal is a Breeze,” Feb. 24, 2000, pp. 60, 62. [cited by applicant]
Outdoor Power Equipment, “DR Power introduces lithium-ion battery-powered hand tools,” Jul. 2012, p. 60. [cited by applicant]
Popular Mechanics, “Leaf Mover and Shaker,” Oct. 2009, p. 28. [cited by applicant]
Pro Tool Reviews, “Kobalt 40V Max Lithium-Ion Mower, Blower, and Chainsaw,” <https://web.archive.org/web/20140630170346/http://www.protoolreviews.com/tools/outdoor-eq . . . > web page publicly available at least as earl… [cited by applicant]
Remington, “18 Volt Cordless Blower RM170B,” Operator's Manual, Apr. 2011 (12 pages). [cited by applicant]
Ryobi, “18 Volt Blower, P2100, P2100A, P2100B,” Operator's Manual, Rev. 04, Feb. 25, 2008 (14 pages). [cited by applicant]
Shop Vac, “Wet/Dry Vacuum,” User Manual, © 2013 (15 pages). [cited by applicant]
Steinel, “Electronic Heat Guns,” <https://web.archive.org/web/20121022121431/http://www.steinel.net/pro . . . > webpage available at least as early as Oct. 2012 (3 pages). [cited by applicant]
Steinel, “Heat Gun,” Handbook, © 2007 (28 pages). [cited by applicant]
Stihl, “Saving Green and Going Green by Choosing Orange,” Feb. 2012 (2 pages). [cited by applicant]
Stihl, “Stihl BGA 85,” Nov. 2010 Manual, © 2010(30 pages). [cited by applicant]
Stihl, “Stihl BGA 85,” Instruction Manual, © 2013 (60 pages). [cited by applicant]
Stihl, “Stihl BGA 85,” Instruction Manual, © 2011 (56 pages). [cited by applicant]
Toolmonger, “This Shop-Vac Blows (But In A Good Way),” <https://toolmonger.com/2007/05/10/this-shop-vac-blows-but-in-a-good-way/> webpage available as early as May 10, 2007 (3 pages). [cited by applicant]
Toro, “Rake and Vac, Super, and Ultra Blower/Vacuum,” Operator's Manual, © 2012 (6 pages). [cited by applicant]
Troy-Bilt “TB4300 / TB4300B Cordless Blower,” Operator's Manual, Mar. 2016 (32 pages). [cited by applicant]
Worx, “18V Cordless Li-ion Blower/Sweeper, WG540,” Manual © 2009 (10 pages). [cited by applicant]
Worx, “Cordless Li-ion Blower/Sweeper, WG545, ” Manual © 2015 (28 pages). [cited by applicant]
Charles & Hudson, “Stihl BGA 85 Electric Leaf Blower,” <https://www.youtube.com/watch?v=JMK4zdlUbbY> YouTube video publicly available at least as early as Feb. 25, 2012. [cited by applicant]
International Search Report and Written Opinion for Application No. PCT/US2021/065752 dated Apr. 19, 2022 (10 pages). [cited by applicant]
Cited By (1)
US 1,137,327