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:
Mar. 07, 2017
Filed:
Dec. 13, 2013
Applicant:
Hitachi Koki Co., Ltd., Tokyo, JP;
Inventors:
Katsuhiro Oomori, Hitachinaka, JP;
Junichi Tokairin, Hitachinaka, JP;
Hiroki Uchida, Hitachinaka, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25F 5/02 (2006.01); H02K 9/06 (2006.01); B25F 5/00 (2006.01); H02K 7/14 (2006.01);
U.S. Cl.
CPC ...
H02K 9/06 (2013.01); B25F 5/008 (2013.01); B25F 5/02 (2013.01); H02K 7/145 (2013.01);
Abstract
According to an aspect of the invention, an electric power tool which includes a brushless direct-current motor and a drive circuit that supplies drive power to the motor, and which rotates or drives a tool, characterized in that the drive circuit includes plural switching elements, and is arranged on a board provided in a grip portion of a housing or below the grip portion; and an electric fan is provided in the vicinity of the switching element for cooling the switching element.