公开(公告)号：US11653802B2

公开(公告)日：2023-05-23

申请号：US17408743

申请日：2021-08-23

Applicant: MAKITA CORPORATION

Inventor： Junichi Iwakami ,  Yuta Kawai

IPC: A47L9/00 ,  A47L5/24 ,  F04D29/66 ,  A47L9/02 ,  A47L5/22

CPC classification number: A47L9/0081 ,  A47L5/22 ,  A47L5/24 ,  A47L9/02 ,  F04D29/66 ,  F04D29/661 ,  F04D29/663 ,  F04D29/668

Abstract: A cleaner reduces noise. The cleaner includes a motor, a fan including a number Z of blades and rotatable at a rotational speed N, indicating revolutions per minute, about a rotation axis by the motor, a cover having an inlet located frontward from the fan, and a number V of ribs located in the inlet. The ribs extend in a radial direction from the rotation axis and are arranged in a circumferential direction about the rotation axis. The fan is rotatable to produce noise having a frequency fNZ of 20,000 Hz or higher, and fNZ=(m−k×V)×N/60 and m=n×Z+k×V, where n is an order, m is an integer, and k is an integer.

公开(公告)号：US10131450B2

公开(公告)日：2018-11-20

申请号：US15141143

申请日：2016-04-28

Applicant: MAKITA CORPORATION

Inventor： Toru Hiroshima ,  Yuta Kawai ,  Sho Kume ,  Kenji Nose ,  Yuki Wada ,  Naoki Ozawa

IPC: B23Q11/00 ,  B64F5/60 ,  B23Q11/06 ,  B23D47/00 ,  B27B9/00

Abstract: A machining device may include an electric motor, a blade rotatably driven by the electric motor for machining a workpiece, and a blade cover configured to surround the blade. A resonance sound reduction device may be disposed at the blade cover and may reduce air vibration generated by the rotation of the blade.