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:
Jan. 26, 2021
Filed:
Oct. 23, 2013
Hitachi Koki Co., Ltd., Tokyo, JP;
Nobuhito Hosokawa, Hitachinaka, JP;
Naoki Tadokoro, Hitachinaka, JP;
Koki Holdings Co., Ltd., Tokyo, JP;
Abstract
It is an object of the invention to provide a power tool capable of performing a control process for avoiding an operation of a protection function for protecting a motor against an overload, unlike the conventional power tool. The control unit detects current I flowing in the motor and determines whether current I exceeds Ior not (S). When current I exceeds I(S: Yes), the control unit starts a duty ratio adjustment mode. When current I exceeds Imax (S: Yes), the control unit accords a protection priority over the adjustment of the duty ratio and stops supplying power to the motor (S). If current I does not exceed Imax (S: No), the duty ratio is decreased (S). When current I becomes lower than I(S: Yes), the control unit increases the duty ratio (S).