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:
Nov. 07, 2023
Filed:
Sep. 21, 2020
Applicant:
Makita Corporation, Anjo, JP;
Inventor:
Itsuku Kato, Anjo, JP;
Assignee:
MAKITA CORPORATION, Anjo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25D 16/00 (2006.01); B25B 19/00 (2006.01); H02P 6/06 (2006.01); B25B 23/147 (2006.01); B25F 5/00 (2006.01);
U.S. Cl.
CPC ...
B25D 16/006 (2013.01); B25B 19/00 (2013.01); B25B 23/1475 (2013.01); H02P 6/06 (2013.01); B25D 2216/0023 (2013.01); B25F 5/001 (2013.01);
Abstract
An electric power tool in one aspect of the present disclosure includes a motor, an impact mechanism, an impact detector, and a control circuit. The control circuit controls a motor current based on a drive duty ratio in a first driving term. The first driving term corresponds to a time period from when the motor is started until impact is detect. The drive duty ratio corresponds to a sum of a basic duty ratio and a proportional duty ratio. The control circuit controls the motor current so that an actual rotational speed of the motor is consistent with a target rotational speed after elapse of the first driving term.