The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 2026
Filed:
Oct. 09, 2024
Milwaukee Electric Tool Corporation, Brookfield, WI (US);
Adam F. Czerwonka, Mukwonago, WI (US);
Sourav Sen, Brookfield, WI (US);
Nathaniel A. Herrera, Oak Creek, WI (US);
Milwaukee Electric Tool Corporation, Brookfield, WI (US);
Abstract
Blower/vacuum tools having reduced fan blade noise are provided. A blower/vacuum tool includes a main body extending between a first end and a second end defining an airflow conduit therethrough; and a fan assembly. The fan assembly includes an axial fan having a number of fan blades (n), and a motor rotatably connected to the fan. In some embodiments, when ng is in a range from 17-45, the axial fan has a Blade Solidity in a range from 0.0464n≤Blade Solidity≤0.089ncalculated by the equation Blade Solidity=c/s where c is the length of the chord line of the fan blades, s=2πr/n, and ris the mean radius of the fan blades. In some embodiments, when the motor operates at a speed of between 21000-38000 rotations per minute (RPM), blade pass frequency (BPF) of the fan assembly as defined by the equation is greater than 6 KHz.